WO2023136337A1 - 歯科用組成物及びその製造方法並びに歯科用表面処理フィラー - Google Patents
歯科用組成物及びその製造方法並びに歯科用表面処理フィラー Download PDFInfo
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- WO2023136337A1 WO2023136337A1 PCT/JP2023/000891 JP2023000891W WO2023136337A1 WO 2023136337 A1 WO2023136337 A1 WO 2023136337A1 JP 2023000891 W JP2023000891 W JP 2023000891W WO 2023136337 A1 WO2023136337 A1 WO 2023136337A1
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- OLXYLDUSSBULGU-UHFFFAOYSA-N methyl pyridine-4-carboxylate Chemical compound COC(=O)C1=CC=NC=C1 OLXYLDUSSBULGU-UHFFFAOYSA-N 0.000 description 1
- LVHBHZANLOWSRM-UHFFFAOYSA-N methylenebutanedioic acid Natural products OC(=O)CC(=C)C(O)=O LVHBHZANLOWSRM-UHFFFAOYSA-N 0.000 description 1
- 239000010445 mica Substances 0.000 description 1
- 229910052618 mica group Inorganic materials 0.000 description 1
- 229910052901 montmorillonite Inorganic materials 0.000 description 1
- LKNDYQNNDRTHFP-UHFFFAOYSA-N n,n,3,4-tetramethylaniline Chemical compound CN(C)C1=CC=C(C)C(C)=C1 LKNDYQNNDRTHFP-UHFFFAOYSA-N 0.000 description 1
- NBFRQCOZERNGEX-UHFFFAOYSA-N n,n,3,5-tetramethylaniline Chemical compound CN(C)C1=CC(C)=CC(C)=C1 NBFRQCOZERNGEX-UHFFFAOYSA-N 0.000 description 1
- CWOMTHDOJCARBY-UHFFFAOYSA-N n,n,3-trimethylaniline Chemical compound CN(C)C1=CC=CC(C)=C1 CWOMTHDOJCARBY-UHFFFAOYSA-N 0.000 description 1
- GYVGXEWAOAAJEU-UHFFFAOYSA-N n,n,4-trimethylaniline Chemical compound CN(C)C1=CC=C(C)C=C1 GYVGXEWAOAAJEU-UHFFFAOYSA-N 0.000 description 1
- HKJNHYJTVPWVGV-UHFFFAOYSA-N n,n-diethyl-4-methylaniline Chemical compound CCN(CC)C1=CC=C(C)C=C1 HKJNHYJTVPWVGV-UHFFFAOYSA-N 0.000 description 1
- MJRUTYCVCLZWSR-UHFFFAOYSA-N n,n-dimethyl-4-propan-2-ylaniline Chemical compound CC(C)C1=CC=C(N(C)C)C=C1 MJRUTYCVCLZWSR-UHFFFAOYSA-N 0.000 description 1
- 229940088644 n,n-dimethylacrylamide Drugs 0.000 description 1
- YLGYACDQVQQZSW-UHFFFAOYSA-N n,n-dimethylprop-2-enamide Chemical compound CN(C)C(=O)C=C YLGYACDQVQQZSW-UHFFFAOYSA-N 0.000 description 1
- 125000006606 n-butoxy group Chemical group 0.000 description 1
- 125000003136 n-heptyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])* 0.000 description 1
- 125000001280 n-hexyl group Chemical group C(CCCCC)* 0.000 description 1
- 125000003935 n-pentoxy group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])O* 0.000 description 1
- 125000003506 n-propoxy group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])O* 0.000 description 1
- 125000001624 naphthyl group Chemical group 0.000 description 1
- 239000006199 nebulizer Substances 0.000 description 1
- 125000001971 neopentyl group Chemical group [H]C([*])([H])C(C([H])([H])[H])(C([H])([H])[H])C([H])([H])[H] 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 230000003472 neutralizing effect Effects 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- HMZGPNHSPWNGEP-UHFFFAOYSA-N octadecyl 2-methylprop-2-enoate Chemical compound CCCCCCCCCCCCCCCCCCOC(=O)C(C)=C HMZGPNHSPWNGEP-UHFFFAOYSA-N 0.000 description 1
- NWAHZAIDMVNENC-UHFFFAOYSA-N octahydro-1h-4,7-methanoinden-5-yl methacrylate Chemical compound C12CCCC2C2CC(OC(=O)C(=C)C)C1C2 NWAHZAIDMVNENC-UHFFFAOYSA-N 0.000 description 1
- HMMGMWAXVFQUOA-UHFFFAOYSA-N octamethylcyclotetrasiloxane Chemical compound C[Si]1(C)O[Si](C)(C)O[Si](C)(C)O[Si](C)(C)O1 HMMGMWAXVFQUOA-UHFFFAOYSA-N 0.000 description 1
- IOQPZZOEVPZRBK-UHFFFAOYSA-N octan-1-amine Chemical compound CCCCCCCCN IOQPZZOEVPZRBK-UHFFFAOYSA-N 0.000 description 1
- 235000005985 organic acids Nutrition 0.000 description 1
- 235000006408 oxalic acid Nutrition 0.000 description 1
- BFYJDHRWCNNYJQ-UHFFFAOYSA-N oxo-(3-oxo-3-phenylpropoxy)-(2,4,6-trimethylphenyl)phosphanium Chemical compound CC1=CC(C)=CC(C)=C1[P+](=O)OCCC(=O)C1=CC=CC=C1 BFYJDHRWCNNYJQ-UHFFFAOYSA-N 0.000 description 1
- 125000005704 oxymethylene group Chemical group [H]C([H])([*:2])O[*:1] 0.000 description 1
- 239000003002 pH adjusting agent Substances 0.000 description 1
- TZMFJUDUGYTVRY-UHFFFAOYSA-N pentane-2,3-dione Chemical compound CCC(=O)C(C)=O TZMFJUDUGYTVRY-UHFFFAOYSA-N 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 150000002978 peroxides Chemical class 0.000 description 1
- 125000005634 peroxydicarbonate group Chemical group 0.000 description 1
- 239000012071 phase Substances 0.000 description 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 229920001084 poly(chloroprene) Polymers 0.000 description 1
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 238000006068 polycondensation reaction Methods 0.000 description 1
- 230000000379 polymerizing effect Effects 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 239000004800 polyvinyl chloride Substances 0.000 description 1
- 229920000915 polyvinyl chloride Polymers 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 235000003270 potassium fluoride Nutrition 0.000 description 1
- 239000011698 potassium fluoride Substances 0.000 description 1
- 229910001414 potassium ion Inorganic materials 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 150000003139 primary aliphatic amines Chemical class 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- SCUZVMOVTVSBLE-UHFFFAOYSA-N prop-2-enenitrile;styrene Chemical compound C=CC#N.C=CC1=CC=CC=C1 SCUZVMOVTVSBLE-UHFFFAOYSA-N 0.000 description 1
- 235000019260 propionic acid Nutrition 0.000 description 1
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 description 1
- 150000003242 quaternary ammonium salts Chemical class 0.000 description 1
- IUVKMZGDUIUOCP-BTNSXGMBSA-N quinbolone Chemical compound O([C@H]1CC[C@H]2[C@H]3[C@@H]([C@]4(C=CC(=O)C=C4CC3)C)CC[C@@]21C)C1=CCCC1 IUVKMZGDUIUOCP-BTNSXGMBSA-N 0.000 description 1
- 150000003254 radicals Chemical class 0.000 description 1
- 229910001426 radium ion Inorganic materials 0.000 description 1
- 235000009566 rice Nutrition 0.000 description 1
- 229910001419 rubidium ion Inorganic materials 0.000 description 1
- 125000002914 sec-butyl group Chemical group [H]C([H])([H])C([H])([H])C([H])(*)C([H])([H])[H] 0.000 description 1
- 125000003548 sec-pentyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])(*)C([H])([H])[H] 0.000 description 1
- 150000005619 secondary aliphatic amines Chemical class 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 230000001568 sexual effect Effects 0.000 description 1
- 125000005372 silanol group Chemical group 0.000 description 1
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- 235000013024 sodium fluoride Nutrition 0.000 description 1
- 239000011775 sodium fluoride Substances 0.000 description 1
- GCLGEJMYGQKIIW-UHFFFAOYSA-H sodium hexametaphosphate Chemical compound [Na]OP1(=O)OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])O1 GCLGEJMYGQKIIW-UHFFFAOYSA-H 0.000 description 1
- 235000019982 sodium hexametaphosphate Nutrition 0.000 description 1
- 229910001415 sodium ion Inorganic materials 0.000 description 1
- 229960004711 sodium monofluorophosphate Drugs 0.000 description 1
- 239000004334 sorbic acid Substances 0.000 description 1
- 235000010199 sorbic acid Nutrition 0.000 description 1
- 229940075582 sorbic acid Drugs 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 229910001427 strontium ion Inorganic materials 0.000 description 1
- 150000003440 styrenes Chemical class 0.000 description 1
- 125000000542 sulfonic acid group Chemical group 0.000 description 1
- 239000011975 tartaric acid Substances 0.000 description 1
- 235000002906 tartaric acid Nutrition 0.000 description 1
- 150000003510 tertiary aliphatic amines Chemical class 0.000 description 1
- 239000001577 tetrasodium phosphonato phosphate Substances 0.000 description 1
- 239000002562 thickening agent Substances 0.000 description 1
- 125000003396 thiol group Chemical group [H]S* 0.000 description 1
- YRHRIQCWCFGUEQ-UHFFFAOYSA-N thioxanthen-9-one Chemical compound C1=CC=C2C(=O)C3=CC=CC=C3SC2=C1 YRHRIQCWCFGUEQ-UHFFFAOYSA-N 0.000 description 1
- VZCYOOQTPOCHFL-UHFFFAOYSA-N trans-butenedioic acid Natural products OC(=O)C=CC(O)=O VZCYOOQTPOCHFL-UHFFFAOYSA-N 0.000 description 1
- LDHQCZJRKDOVOX-UHFFFAOYSA-N trans-crotonic acid Natural products CC=CC(O)=O LDHQCZJRKDOVOX-UHFFFAOYSA-N 0.000 description 1
- IMFACGCPASFAPR-UHFFFAOYSA-N tributylamine Chemical compound CCCCN(CCCC)CCCC IMFACGCPASFAPR-UHFFFAOYSA-N 0.000 description 1
- GQIUQDDJKHLHTB-UHFFFAOYSA-N trichloro(ethenyl)silane Chemical compound Cl[Si](Cl)(Cl)C=C GQIUQDDJKHLHTB-UHFFFAOYSA-N 0.000 description 1
- ZIBGPFATKBEMQZ-UHFFFAOYSA-N triethylene glycol Chemical compound OCCOCCOCCO ZIBGPFATKBEMQZ-UHFFFAOYSA-N 0.000 description 1
- BPSIOYPQMFLKFR-UHFFFAOYSA-N trimethoxy-[3-(oxiran-2-ylmethoxy)propyl]silane Chemical compound CO[Si](OC)(OC)CCCOCC1CO1 BPSIOYPQMFLKFR-UHFFFAOYSA-N 0.000 description 1
- QXJQHYBHAIHNGG-UHFFFAOYSA-N trimethylolethane Chemical compound OCC(C)(CO)CO QXJQHYBHAIHNGG-UHFFFAOYSA-N 0.000 description 1
- OUYCCCASQSFEME-UHFFFAOYSA-N tyrosine Natural products OC(=O)C(N)CC1=CC=C(O)C=C1 OUYCCCASQSFEME-UHFFFAOYSA-N 0.000 description 1
- 239000011882 ultra-fine particle Substances 0.000 description 1
- 230000008016 vaporization Effects 0.000 description 1
- 229920001567 vinyl ester resin Polymers 0.000 description 1
- 239000005050 vinyl trichlorosilane Substances 0.000 description 1
- 229910052724 xenon Inorganic materials 0.000 description 1
- FHNFHKCVQCLJFQ-UHFFFAOYSA-N xenon atom Chemical compound [Xe] FHNFHKCVQCLJFQ-UHFFFAOYSA-N 0.000 description 1
- 239000010457 zeolite Substances 0.000 description 1
Images
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K6/00—Preparations for dentistry
- A61K6/30—Compositions for temporarily or permanently fixing teeth or palates, e.g. primers for dental adhesives
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K6/00—Preparations for dentistry
- A61K6/80—Preparations for artificial teeth, for filling teeth or for capping teeth
- A61K6/884—Preparations for artificial teeth, for filling teeth or for capping teeth comprising natural or synthetic resins
- A61K6/891—Compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- A61K6/896—Polyorganosilicon compounds
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K6/00—Preparations for dentistry
- A61K6/70—Preparations for dentistry comprising inorganic additives
- A61K6/71—Fillers
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K6/00—Preparations for dentistry
- A61K6/70—Preparations for dentistry comprising inorganic additives
- A61K6/71—Fillers
- A61K6/76—Fillers comprising silicon-containing compounds
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K6/00—Preparations for dentistry
- A61K6/70—Preparations for dentistry comprising inorganic additives
- A61K6/78—Pigments
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K6/00—Preparations for dentistry
- A61K6/80—Preparations for artificial teeth, for filling teeth or for capping teeth
- A61K6/884—Preparations for artificial teeth, for filling teeth or for capping teeth comprising natural or synthetic resins
- A61K6/887—Compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
Definitions
- the present invention relates to dental compositions. More specifically, the present invention relates to a dental composition which has excellent storage stability even under severe conditions and whose cured product has sufficient mechanical strength, a method for producing the same, and a dental surface-treated filler.
- Restorative treatment using dental bonding materials and dental composite resins has been commonly used to treat dental caries and accompanying defects.
- this restoration treatment the following procedures are followed. First, a cavity is formed by shaving a carious part, etc., and then a dental adhesive is applied to this cavity. If necessary, the solvent is removed by an air blow or the like. to cure the dental bonding material. Next, the cured dental bonding material layer is filled with a dental composite resin, and finally the filled dental composite resin is irradiated with visible light to be cured.
- Self-adhesive dental composite resins contain ingredients such as polyfunctional polymerizable monomers, fillers, and polymerization initiators, which are also contained in conventional dental composite resins.
- oxides, carbonates, or hydroxides of alkaline earth metals such as barium and strontium, which are commonly used as fillers for dental composite resins, or acid-reactive fluoroaluminosilicate glasses, etc. are disclosed in Patent Document 1.
- an acid-base reaction, neutralization, salt formation, or chelate reaction is induced between the filler and the polymerizable monomer having an acidic group.
- the polymerizable monomer having an acidic group is consumed, there is a problem between the specific filler and the polymerizable monomer having an acidic group that the self-adhesiveness itself is impaired. It is known.
- Patent Document 2 discloses a one-component self-adhesive dental composition containing a filler having low reactivity with acidic components, such as a silica filler treated with a silane coupling agent.
- Patent Document 3 by subjecting inorganic particles containing polyvalent metals to acid treatment to reduce the amount of polyvalent metals on the surface of the inorganic particles, a polymerizable monomer having an acidic group can be obtained.
- a dental composition has been disclosed which has excellent storage stability even though the composition contains inorganic particles containing a polyvalent metal and a polyvalent metal.
- Patent Document 4 by blending inorganic particles surface-treated with a silane coupling agent having a specific structure and an organosilazane having a specific structure, excellent storage stability is achieved while maintaining mechanical strength. , and a self-adhesive dental composite resin that exhibits little change in transparency and properties of the paste and has little risk of hardening during long-term storage.
- JP 2008-260752 A Japanese Patent Application Publication No. 2015-507610 JP 2011-178778 A WO2018/074594
- the one-component self-adhesive dental composition containing a silica filler or the like surface-treated with a general silane coupling agent disclosed in Patent Document 2 is sufficient. It was found that storage stability was not obtained.
- an object of the present invention is to provide a dental composition which has excellent storage stability even under severe conditions and whose cured product has sufficient mechanical strength, a method for producing the same, and a dental surface-treated filler. do.
- the present invention includes the following. [1] including a polymerizable monomer (A), a polymerization initiator (B), and a filler (C),
- the filler (C) comprises a silane coupling agent (a) having a polymerizable group and a dental surface-treated filler (C-1) surface-treated with an endcapping agent (b), and the dental surface A dental composition, wherein the treated filler (C-1) has a metal component elution amount of less than 100 ppm in an acid resistance test.
- the endcapping agent (b) is a compound having a structure represented by the following formula (1) or (2) and having a boiling point of 180°C or less. Composition.
- R 1 to R 6 each independently represent a hydrogen atom, a hydroxyl group, an alkyl group having 1 to 9 carbon atoms or an alkoxy group having 1 to 4 carbon atoms.
- x is an integer of 3-10
- y is an integer of 1-100.
- the dental surface-treated filler (C-1) is surface-treated with the silane coupling agent (a) having a polymerizable group, and then surface-treated with the end-capping agent (b).
- the dental composition according to [1] or [2].
- a dental composition according to any one of the above [5] The dental composition according to any one of [1] to [4], wherein the dental surface treatment filler (C-1) contains an X-ray opaque filler. [6] The dental composition according to [5], wherein the X-ray opaque filler is acid-treated. [7] The silane coupling agent (a) having a polymerizable group is 3-methacryloyloxypropyltrimethoxysilane, 8-(meth)acryloyloxyoctyltrimethoxysilane, 11-(meth)acryloyloxyundecyltrimethoxysilane. and the dental composition according to any one of [1] to [6], which contains a hydrolyzate thereof.
- the treatment amount of the filler with the end capping agent (b) is 0.01 per 100 parts by mass of the filler before surface treatment.
- the polymerizable monomer (A) comprises a polymerizable monomer (A-1) having an acidic group and a polymerizable monomer (A-2) having no acidic group, [1 ] to [9].
- the content of the polymerizable monomer (A-1) having an acidic group is 1 to 40 parts by mass in 100 parts by mass of the polymerizable monomer (A), according to [10].
- dental composition [12] A self-adhesive dental composite resin comprising the dental composition according to any one of [1] to [11]. [13] A dental bonding material comprising the dental composition according to any one of [1] to [11]. [14] A dental cement comprising the dental composition according to any one of [1] to [11]. [15] A dental composite resin comprising the dental composition according to any one of [1] to [11]. [16] A dental abutment building material comprising the dental composition according to any one of [1] to [11].
- a method for producing the dental composition according to 1. [18] A filler is surface-treated with a silane coupling agent (a) having a polymerizable group and an endcapping agent (b), and the endcapping agent (b) is represented by the following formula (1) or (2) ) and a boiling point of 180° C. or less, a dental surface-treated filler (C-1).
- R 1 to R 6 each independently represent a hydrogen atom, a hydroxyl group, an alkyl group having 1 to 9 carbon atoms or an alkoxy group having 1 to 4 carbon atoms.
- x is an integer of 3-10
- y is an integer of 1-100.
- the dental composition of the present invention it is possible to provide a dental composition which has excellent storage stability even under severe conditions and whose cured product has sufficient mechanical strength, a method for producing the same, and a dental surface-treated filler. Moreover, since the dental composition of the present invention has such excellent properties, it can be used as a self-adhesive dental composite resin, a dental bonding material, a dental cement, a dental composite resin, and a dental abutment building material. and the like.
- Example 3 shows the surface of the surface-treated filler used in the dental composition according to Comparative Example 1-1.
- 1 shows the surface of a surface-treated filler used in the dental composition according to Example 1-1.
- the dental composition of the present invention comprises a polymerizable monomer (A), a polymerization initiator (B), and a filler (C), wherein the filler (C) is a silane coupling agent having a polymerizable group ( a), and a surface-treated filler (C-1) surface-treated with an end-capping agent (b), and the elution amount of the metal component in the acid resistance test of the surface-treated filler (C-1) is less than 100 ppm. be.
- the endcapping agent (b) is preferably a compound having a specific structure and a boiling point of 180° C. or less, which will be described later.
- (meth)acrylic is a generic term for methacrylic and acrylic, and similar expressions ("(meth)acrylic acid”, “(meth)acrylonitrile”, etc.) are also the same. .
- the upper limit and lower limit of the numerical range can be combined as appropriate.
- the dental composition of the present invention has excellent storage stability even under severe conditions (for example, 60° C. for 4 weeks) and the cured product thereof has sufficient mechanical strength.
- the surface-treated filler (C-1) treated with a silane coupling agent (a) having a polymerizable group and an endcapping agent (b) having a specific structure and a boiling point of 180° C. or less was mechanically It is presumed that the surface of the filler is more densely covered with organic molecules than the surface-treated filler that has sufficient polymerizable groups on the surface to ensure strength and is surface-treated by a conventional method. . Therefore, it is considered that good storage stability is maintained for a long period of time because the surface-treated filler (C-1) is prevented from interacting with other components.
- a radically polymerizable monomer is preferably used as the polymerizable monomer (A) used in the dental composition of the present invention.
- Specific examples of the radical polymerizable monomer in the polymerizable monomer (A) include (meth)acrylate polymerizable monomers, (meth)acrylamide polymerizable monomers, ⁇ -cyanoacrylic acid, ( Esters such as meth)acrylic acid, ⁇ -halogenated acrylic acid, crotonic acid, cinnamic acid, sorbic acid, maleic acid, itaconic acid, vinyl esters, vinyl ethers, mono-N-vinyl derivatives, styrene derivatives, etc. be done.
- the polymerizable monomer (A) is a polymerizable monomer (A-1) having an acidic group, and It preferably contains a polymerizable monomer (A-2) having no acidic group.
- a polymerizable monomer having an acidic group (A-1) A polymerizable monomer (A-1) having an acidic group is preferred in order to impart adhesiveness to dentin.
- Examples of the polymerizable monomer (A-1) having an acidic group used in the present invention include acidic Examples include polymerizable monomers having at least one group.
- the polymerizable monomer (A-1) having an acidic group can be used singly or in combination of two or more. Specific examples of the polymerizable monomer (A-1) having an acidic group are given below.
- Polymerizable monomers having a phosphoric acid group include 2-(meth)acryloyloxyethyl dihydrogen phosphate, 3-(meth)acryloyloxypropyl dihydrogen phosphate, 4-(meth)acryloyloxybutyl dihydrogen Phosphate, 5-(meth)acryloyloxypentyl dihydrogen phosphate, 6-(meth) acryloyloxyhexyl dihydrogen phosphate, 7-(meth) acryloyloxyheptyl dihydrogen phosphate, 8-(meth) acryloyloxyoctyl dihydrogen phosphate hydrogen phosphate, 9-(meth)acryloyloxynonyl dihydrogen phosphate, 10-(meth)acryloyloxydecyldihydrogenphosphate, 11-(meth)acryloyloxyundecyldihydrogenphosphate, 12-(meth)acryloyl oxidodecyl
- Examples of the polymerizable monomer having a pyrophosphate group include bis[2-(meth)acryloyloxyethyl] pyrophosphate, bis[4-(meth)acryloyloxybutyl] pyrophosphate, bis[6-(meth)pyrophosphate acryloyloxyhexyl], bis[8-(meth)acryloyloxyoctyl] pyrophosphate, bis[10-(meth)acryloyloxydecyl] pyrophosphate, and acid chlorides, alkali metal salts and amine salts thereof.
- Polymerizable monomers having a thiophosphoric acid group include 2-(meth)acryloyloxyethyl dihydrogenthiophosphate, 3-(meth)acryloyloxypropyl dihydrogenthiophosphate, 4-(meth)acryloyloxybutyl dihydrogenthiophosphate, hydrogenthiophosphate, 5-(meth)acryloyloxypentyl dihydrogenthiophosphate, 6-(meth)acryloyloxyhexyldihydrogenthiophosphate, 7-(meth)acryloyloxyheptyldihydrogenthiophosphate, 8-( meth)acryloyloxyoctyl dihydrogenthiophosphate, 9-(meth)acryloyloxynonyl dihydrogenthiophosphate, 10-(meth)acryloyloxydecyldihydrogenthiophosphate, 11-(meth)acryloyloxyundecyldihydro Genthiophosphate, 12-(
- Polymerizable monomers having a phosphonic acid group include 2-(meth)acryloyloxyethylphenylphosphonate, 5-(meth)acryloyloxypentyl-3-phosphonopropionate, 6-(meth)acryloyloxyhexyl- 3-phosphonopropionate, 10-(meth)acryloyloxydecyl-3-phosphonopropionate, 6-(meth)acryloyloxyhexyl-3-phosphonoacetate, 10-(meth)acryloyloxydecyl-3 - Phosphonoacetate and their acid chlorides, alkali metal salts and ammonium salts.
- polymerizable monomer having a carboxylic acid group a monofunctional (meth)acrylic acid ester having one carboxyl group or its acid anhydride group in the molecule, a plurality of carboxyl groups in the molecule or its acid anhydride group and monofunctional (meth)acrylic acid esters having a monofunctional group.
- Examples of monofunctional polymerizable monomers having one carboxyl group or its acid anhydride group in the molecule include (meth)acrylic acid, N-(meth)acryloylglycine, N-(meth)acryloylasparagine acid, 2-(meth) acryloyloxyethyl hydrogen succinate, 2-(meth) acryloyloxyethyl hydrogen phthalate, 2-(meth) acryloyloxyethyl hydrogen malate, O-(meth) acryloyl tyrosine, N-( meth)acryloyltyrosine, N-(meth)acryloylphenylalanine, N-(meth)acryloyl-p-aminobenzoic acid, N-(meth)acryloyl-o-aminobenzoic acid, 2-(meth)acryloyloxybenzoic acid, 3 -(meth)acryloyloxybenzoic acid, 4-(meth)acryloy
- Examples of monofunctional polymerizable monomers having multiple carboxyl groups or acid anhydride groups in the molecule include 6-(meth)acryloyloxyhexane-1,1-dicarboxylic acid, 9-(meth) ) acryloyloxynonane-1,1-dicarboxylic acid, 10-(meth)acryloyloxydecane-1,1-dicarboxylic acid, 11-(meth)acryloyloxyundecane-1,1-dicarboxylic acid, 12-(meth)acryloyl Ododecane-1,1-dicarboxylic acid, 13-(meth)acryloyloxytridecane-1,1-dicarboxylic acid, 4-(meth)acryloyloxyethyl trimellitate, 4-(meth)acryloyloxyethyl trimellitate Anhydride, 4-(meth)acryloyloxybutyl trimellitate, 4-(meth)acryloyloxyhexyl trimell
- Examples of polymerizable monomers having a sulfonic acid group include 2-sulfoethyl (meth)acrylate.
- polymerizable monomers having an acidic group (A-1) polymerizable monomers having a phosphoric acid group or carboxylic acids are preferred from the viewpoint of good adhesive strength when used as a dental composition.
- It preferably contains a polymerizable monomer having an acid group, such as 2-(meth)acryloyloxyethyl dihydrogenphosphate, 3-(meth)acryloyloxypropyl dihydrogenphosphate, 4-(meth)acryloyloxybutyl dihydrogenphosphate, hydrogen phosphate, 5-(meth)acryloyloxypentyl dihydrogen phosphate, 6-(meth) acryloyloxyhexyl dihydrogen phosphate, 7-(meth) acryloyloxyheptyl dihydrogen phosphate, 8-(meth) acryloyloxy Octyl dihydrogen phosphate, 9-(meth) acryloyloxynonyl dihydrogen phosphate, 10-(
- the content of the polymerizable monomer (A-1) having an acidic group in the dental composition of the present invention is 1 per 100 parts by mass of the polymerizable monomer (A) from the viewpoint of adhesion to tooth substance. It is preferably 40 parts by mass, more preferably 2.5 to 35 parts by mass, and even more preferably 5 to 30 parts by mass.
- a polymerizable monomer having no acidic group As the polymerizable monomer (A-2) having no acidic group in the present invention, a hydrophobic polymerizable monomer (A-2a ); a hydrophilic polymerizable monomer (A-2b) having no acidic group and having a solubility in water at 25° C. of 10% by mass or more.
- the polymerizable monomer (A-2) having no acidic group may be used alone or in combination of two or more.
- hydrophobic polymerizable monomer having no acidic group (A-2a)
- the hydrophobic polymerizable monomer (A-2a) having no acidic group (hereinafter sometimes simply referred to as "hydrophobic polymerizable monomer (A-2a)") is used to improve the handling properties of the dental composition. , to improve the mechanical strength of the cured product.
- the hydrophobic polymerizable monomer (A-2a) is preferably a radically polymerizable monomer having a polymerizable group without an acidic group, and from the viewpoint of facilitating radical polymerization, the polymerizable group is (meth ) acryloyloxy groups and/or (meth)acrylamide groups are preferred.
- the hydrophobic polymerizable monomer (A-2a) means a polymerizable monomer having no acidic group and having a solubility in water at 25°C of less than 10% by mass.
- Examples of the hydrophobic polymerizable monomer (A-2a) include, in addition to hydrophobic monofunctional polymerizable monomers, aromatic compound-based bifunctional polymerizable monomers, aliphatic compound-based Crosslinkable polymerizable monomers such as bifunctional polymerizable monomers and trifunctional or higher polymerizable monomers are exemplified.
- Hydrophobic monofunctional polymerizable monomers include, for example, methyl methacrylate, ethyl methacrylate, butyl methacrylate, benzyl methacrylate, tetrahydrofurfuryl methacrylate and isobornyl methacrylate, p-cumyl-phenoxyethylene glycol methacrylate (CMP- 1E), 2-phenoxybenzyl methacrylate, stearyl methacrylate, dicyclopentanyl methacrylate, butoxydiethylene glycol methacrylate, methoxypolyethylene glycol methacrylate and mixtures thereof, among them benzyl methacrylate, tetrahydrofurfuryl methacrylate, isobornyl methacrylate, CMP-1E and mixtures thereof are preferred.
- aromatic compound-based bifunctional polymerizable monomers examples include 2,2-bis((meth)acryloyloxyphenyl)propane, 2,2-bis[4-(2-hydroxy-3-(meth) ) acryloyloxypropoxy)phenyl]propane, 2,2-bis(4-(meth)acryloyloxyethoxyphenyl)propane, 2,2-bis(4-(meth)acryloyloxypolyethoxyphenyl)propane, 2,2- Bis(4-(meth)acryloyloxydiethoxyphenyl)propane, 2,2-bis(4-(meth)acryloyloxytriethoxyphenyl)propane, 2,2-bis(4-(meth)acryloyloxytetraethoxyphenyl) ) propane, 2,2-bis(4-(meth)acryloyloxypentaethoxyphenyl)propane, 2,2-bis(4-(meth)acryloyloxydipropoxyphen
- 2,2-bis[4-(2-hydroxy-3-methacryloyloxypropoxy)phenyl]propane (commonly known as "Bis-GMA"), 2,2-bis(4-(meth)acryloyloxyethoxyphenyl ) propane, 2,2-bis(4-methacryloyloxypolyethoxyphenyl)propane (average addition mole number of ethoxy group: 2.6, commonly known as “D-2.6E”), 2,2-bis(4-( meth)acryloyloxydiethoxyphenyl)propane, 2,2-bis(4-(meth)acryloyloxytriethoxyphenyl)propane, 2,2-bis(4-(meth)acryloyloxytetraethoxyphenyl)propane, 2, 2-bis(4-(meth)acryloyloxypentaethoxyphenyl)propane is preferred.
- aliphatic compound-based bifunctional polymerizable monomers include glycerol di(meth)acrylate, ethylene glycol di(meth)acrylate, diethylene glycol di(meth)acrylate, triethylene glycol di(meth)acrylate, propylene glycol di(meth)acrylate, butylene glycol di(meth)acrylate, neopentyl glycol di(meth)acrylate, 1,3-butanediol di(meth)acrylate, 1,5-pentanediol di(meth)acrylate, 1, 6-hexanediol di(meth)acrylate, 1,10-decanediol di(meth)acrylate, 1,2-bis(3-methacryloyloxy-2-hydroxypropoxy)ethane, 2,2,4-trimethylhexamethylene bis (2-carbamoyloxyethyl) di(meth)acrylate, N-methacryloyloxyethyl acrylamide,
- triethylene glycol diacrylate triethylene glycol dimethacrylate (commonly known as "3G")
- neopentyl glycol di(meth)acrylate 1,2-bis(3-methacryloyloxy-2-hydroxypropoxy)ethane
- 2 2,4-trimethylhexamethylenebis(2-carbamoyloxyethyl) dimethacrylate
- UDMA 1,10-decanediol dimethacrylate
- DD 1,10-decanediol dimethacrylate
- MAEA N-methacryloyloxyethyl acrylamide
- trifunctional or higher polymerizable monomers examples include trimethylolpropane tri(meth)acrylate, trimethylolethane tri(meth)acrylate, trimethylolmethane tri(meth)acrylate, pentaerythritol tri(meth)acrylate, pentaerythritol tetra(meth)acrylate, dipentaerythritol penta(meth)acrylate, N,N-(2,2,4-trimethylhexamethylene)bis[2-(aminocarboxy)propane-1,3-diol]tetra( meth)acrylate, 1,7-diacryloyloxy-2,2,6,6-tetra(meth)acryloyloxymethyl-4-oxaheptane and the like.
- N,N-(2,2,4-trimethylhexamethylene)bis[2-(aminocarboxy)propane-1,3-diol]tetramethacrylate is
- aromatic compound-based bifunctional polymerizable monomers and aliphatic compound-based bifunctional A polymerizable monomer is preferably used.
- Bis-GMA and D-2.6E are preferable as the aromatic compound-based bifunctional polymerizable monomer.
- aliphatic compound-based bifunctional polymerizable monomers examples include glycerol di(meth)acrylate, 3G, neopentyl glycol di(meth)acrylate, 1,6-hexanediol di(meth)acrylate, DD, 1, 2-bis(3-methacryloyloxy-2-hydroxypropoxy)ethane, UDMA, MAEA are preferred.
- Bis-GMA, D-2.6E, 3G, UDMA, DD and MAEA are more preferred, and Bis-GMA, D-2.6E, 3G and MAEA are even more preferred.
- the hydrophobic polymerizable monomer (A-2a) may be blended alone or in combination of two or more.
- the content of the hydrophobic polymerizable monomer (A-2a) in the dental composition of the present invention is preferably 20 to 99 parts by mass, more preferably 40 to 95 parts by mass, based on 100 parts by mass of the polymerizable monomer (A). parts is more preferred, and 60 to 95 parts by mass is even more preferred.
- the content of the hydrophobic polymerizable monomer (A-2a) is within the above range, the wettability of the dental composition to tooth substance is excellent, desired adhesiveness is obtained, and a cured product is desired. has a mechanical strength of
- the polymerizable monomer (A) is a hydrophilic polymerizable monomer (A-2b) having no acidic group (hereinafter simply referred to as "hydrophilic polymerizable monomer (A -2b)”).
- the hydrophilic polymerizable monomer (A-2b) improves the wettability of the dental composition to tooth substance.
- the hydrophilic polymerizable monomer (A-2b) is preferably a radically polymerizable monomer having a polymerizable group without an acidic group, and from the viewpoint of facilitating radical polymerization, the polymerizable group is (meth ) acryloyloxy groups and/or (meth)acrylamide groups are preferred.
- the hydrophilic polymerizable monomer (A-2b) means one having no acidic group and having a solubility in water at 25° C. of 10% by mass or more, preferably 30% by mass or more. , soluble in water at any ratio at 25°C is more preferable.
- hydrophilic polymerizable monomer those having a hydrophilic group such as a hydroxyl group, an oxymethylene group, an oxyethylene group, an oxypropylene group and an amide group are preferred.
- hydrophilic polymerizable monomer (A-2b) include 2-hydroxyethyl (meth)acrylate, 3-hydroxypropyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, 1,3-dihydroxypropyl Hydrophilicity such as (meth)acrylate, 2,3-dihydroxypropyl (meth)acrylate, 2-((meth)acryloyloxy)ethyltrimethylammonium chloride, polyethylene glycol di(meth)acrylate (number of oxyethylene groups: 9 or more) monofunctional (meth)acrylate polymerizable monomer; N-methylol (meth)acrylamide, N-hydroxyethyl (meth)acrylamide, N,N-bis (2-hydroxyethyl) (meth) (me
- hydrophilic polymerizable monomers (A-2b) 2-hydroxyethyl (meth)acrylate, 2,3-dihydroxypropyl (meth)acrylate, and hydrophilic monomers are preferred from the viewpoint of adhesion to tooth substance.
- Functional (meth)acrylamide polymerizable monomers are preferred, and 2-hydroxyethyl (meth)acrylate, N,N-dimethylacrylamide and N,N-diethylacrylamide are more preferred.
- the hydrophilic polymerizable monomer (A-2b) may be blended singly or in combination of two or more.
- the content of the hydrophilic polymerizable monomer (A-2b) in the dental composition of the present invention is preferably in the range of 0 to 50 parts by mass based on 100 parts by mass of the polymerizable monomer (A). 40 parts by mass is more preferable, and 0 to 30 parts by mass is even more preferable.
- the content of the hydrophilic polymerizable monomer (A-2b) may be 0 parts by mass in 100 parts by mass of the polymerizable monomer (A). When the content of the hydrophilic polymerizable monomer (A-2b) is within the above range, an effect of improving adhesion is obtained, and the cured product has desired mechanical strength.
- the content of the polymerizable monomer (A-2) having no acidic group is preferably 50 to 99 parts by mass, more preferably 60 to 97 parts by mass, based on 100 parts by mass of the polymerizable monomer (A). 70 to 95 parts by mass is more preferable.
- the polymerization initiator (B) is classified into a water-soluble photopolymerization initiator (B-1), a water-insoluble photopolymerization initiator (B-2), and a chemical polymerization initiator (B-3).
- a water-soluble photopolymerization initiator (B-1) may be used
- a water-insoluble photopolymerization initiator (B-2) may be used
- a chemical polymerization initiator (B-3) may be used alone, or a water-soluble photopolymerization initiator (B-1), a water-insoluble photopolymerization initiator (B-2), and a chemical polymerization initiator (B-3) may be used in combination.
- the water-soluble photopolymerization initiator (B-1) improves the polymerization curability at the hydrophilic tooth surface interface and can realize high adhesive strength.
- the water-soluble photopolymerization initiator (B-1) has a solubility in water at 25° C. of 10 g/L or more, preferably 15 g/L or more, more preferably 20 g/L or more, and 25 g/L or more. L or more is more preferable. When the solubility is 10 g/L or more, the water-soluble photopolymerization initiator (B-1) is sufficiently dissolved in the water in the dentin at the adhesion interface, and the effect of promoting polymerization is easily exhibited.
- Water-soluble photopolymerization initiators (B-1) include, for example, water-soluble acylphosphine oxides; water-soluble thioxanthones; 1-[4-(2-hydroxyethoxy)-phenyl]-2-hydroxy-2-methyl -1-Propan-1-one in which a (poly)ethylene glycol chain is introduced into the hydroxyl group, 1-hydroxycyclohexylphenylketone in which a (poly)ethylene glycol chain is introduced into the hydroxyl group and/or the phenyl group, 1-hydroxy —OCH 2 COO ⁇ Na + introduced into the phenyl group of cyclohexylphenyl ketone, and a (poly)ethylene glycol chain introduced into the hydroxyl group and/or phenyl group of 2-hydroxy-2-methyl-1-phenylpropan-1-one ⁇ -hydroxyalkylacetophenones such as those introduced with -OCH 2 COO - Na + into the phenyl group of 2-hydroxy-2
- water-soluble thioxanthones examples include 2-hydroxy-3-(9-oxo-9H-thioxanthen-4-yloxy)-N,N,N-trimethyl-1-propanaminium chloride, 2-hydroxy- 3-(1-methyl-9-oxo-9H-thioxanthen-4-yloxy)-N,N,N-trimethyl-1-propanaminium chloride, 2-hydroxy-3-(9-oxo-9H-thio xanthen-2-yloxy)-N,N,N-trimethyl-1-propanaminium chloride, 2-hydroxy-3-(3,4-dimethyl-9-oxo-9H-thioxanthen-2-yloxy)-N , N,N-trimethyl-1-propanaminium chloride, 2-hydroxy-3-(3,4-dimethyl-9H-thioxanthen-2-yloxy)-N,N,N-trimethyl-1-propanaminium Chloride, 2-hydroxy-3-(1,3,4-trimethyl-9H
- water-soluble acylphosphine oxides examples include acylphosphine oxides represented by the following general formula (4) or (5).
- a 1 , A 2 , A 3 , A 4 , A 5 and A 6 are each independently a C 1 to C 4 linear or branched alkyl group or a halogen atom; is a hydrogen ion, an alkali metal ion, an alkaline earth metal ion, a magnesium ion, a pyridinium ion (the pyridine ring may have a substituent), or HN + A 8 A 9 A 10 (wherein A 8 , A 9 and A 10 are each independently an ammonium ion represented by an organic group or a hydrogen atom), n is 1 or 2, Z is a C 1 to C 4 linear or branched It is an alkylene group, A 7 is represented by —CH(CH 3 )COO(C 2 H 4 O) p CH 3 and p represents an integer of 1-1000.
- Alkyl groups for A 1 , A 2 , A 3 , A 4 , A 5 , and A 6 are not particularly limited as long as they are C 1 to C 4 linear or branched alkyl groups. ethyl group, n-propyl group, isopropyl group, n-butyl group, isobutyl group, sec-butyl group, 2-methylpropyl group, tert-butyl group and the like.
- the alkyl group for A 1 , A 2 , A 3 , A 4 , A 5 and A 6 is preferably a C 1 to C 3 linear alkyl group, more preferably a methyl group or an ethyl group, and a methyl group. is more preferred.
- the alkylene group for Z includes a methylene group, ethylene group, n-propylene group, isopropylene group, n-butylene group and the like.
- the alkylene group for Z is preferably a C 1 to C 3 linear alkylene group, more preferably a methylene group or an ethylene group, and still more preferably a methylene group.
- the pyridine ring substituents include halogen atoms (fluorine, chlorine, bromine and iodine atoms), carboxyl groups, and C 2 to C 6 linear or branched acyl groups. groups, C 1 to C 6 linear or branched alkyl groups, C 1 to C 6 linear or branched alkoxy groups, and the like.
- M is an alkali metal ion, an alkaline earth metal ion, a magnesium ion, a pyridinium ion (the pyridine ring may have a substituent), or HN + A 8 A 9 A 10 (wherein the symbols are the above are preferred.
- Alkali metal ions include lithium ions, sodium ions, potassium ions, rubidium ions, and cesium ions.
- Alkaline earth metal ions include calcium ions, strontium ions, barium ions, and radium ions.
- Examples of the organic groups for A 8 , A 9 and A 10 include the same substituents for the pyridine ring (excluding halogen atoms).
- examples of Mn + include Li + , Na + , K + , Ca 2+ , Mg 2+ , and ammonium ions derived from various amines.
- amines include ammonia, trimethylamine, diethylamine, dimethyl Aniline, ethylenediamine, triethanolamine, N,N-dimethylamino methacrylate, 4-(N,N-dimethylamino)benzoic acid and its alkyl esters, 4-(N,N-diethylamino)benzoic acid and its alkyl esters, N , N-bis(2-hydroxyethyl)-p-toluidine and the like.
- p is 1 or more, preferably 2 or more, more preferably 3 or more, more preferably 4 or more, 1000 or less, preferably 100 or less, more preferably 75 or less, 50 or less is more preferable.
- a 1 , A 2 and A 3 in general formula (4) and A 1 , A 2 , A 3 , A 4 , A 5 and A 6 in general formula ( 5 ) are as described above. is.
- Water-soluble acylphosphine oxides having such a structure can be synthesized according to known methods, and some are also available as commercial products. For example, it can be synthesized by the methods disclosed in JP-A-57-197289 and WO 2014/095724.
- the water-soluble photopolymerization initiator (B-1) may be used alone or in combination of two or more.
- the water-soluble photopolymerization initiator (B-1) may be dissolved in the dental composition or dispersed in the composition in the form of powder.
- the average particle size of the water-soluble photopolymerization initiator (B-1) is preferably in the range of 0.01 to 500 ⁇ m, more preferably in the range of 0.01 to 100 ⁇ m, even more preferably in the range of 0.01 to 50 ⁇ m.
- the average particle size of the powder of each water-soluble photopolymerization initiator (B-1) is determined by image analysis type particle size distribution measurement software (Mac-View; manufactured by Mountec) based on electron micrographs of 100 or more particles. It can be calculated as a volume average particle size after image analysis is performed using.
- the shape of the initiator includes various shapes such as spherical, needle-like, plate-like, and crushed shapes. , is not particularly limited.
- the water-soluble photopolymerization initiator (B-1) can be prepared by a conventionally known method such as a pulverization method, a freeze-drying method, and a reprecipitation method. and reprecipitation methods are preferred, and freeze-drying methods are more preferred.
- the content of the water-soluble photopolymerization initiator (B-1) is 100 parts by mass of the polymerizable monomer (A) in the dental composition of the present invention, from the viewpoint of the curability of the resulting dental composition. is preferably 0.01 to 20 parts by mass, more preferably 0.05 to 10 parts by mass, and even more preferably 0.1 to 5 parts by mass from the viewpoint of adhesion to tooth substance.
- the content of the water-soluble photopolymerization initiator (B-1) is 0.01 parts by mass or more, the polymerization at the adhesive interface proceeds sufficiently to obtain the desired adhesiveness.
- the content of the water-soluble photopolymerization initiator (B-1) is 20 parts by mass or less, sufficient adhesion can be obtained.
- the dental composition of the present invention includes, in addition to the water-soluble photopolymerization initiator (B-1), a water-insoluble photopolymerization initiator ( B-2) (hereinafter sometimes referred to as a water-insoluble photopolymerization initiator (B-2)) is preferably included.
- a water-insoluble photopolymerization initiator B-2
- a known photopolymerization initiator can be used as the water-insoluble photopolymerization initiator (B-2) used in the present invention.
- the water-insoluble photopolymerization initiator (B-2) may be blended alone or in combination of two or more.
- water-insoluble photopolymerization initiator (B-2) examples include (bis)acylphosphine oxides other than the water-soluble photopolymerization initiator (B-1), thioxanthones, ketals, ⁇ -diketones, coumarins, Examples include anthraquinones, benzoin alkyl ether compounds, and ⁇ -aminoketone compounds.
- acylphosphine oxides include 2,4,6-trimethylbenzoyldiphenylphosphine oxide, 2,6-dimethoxybenzoyldiphenylphosphine oxide, 2,6-dichlorobenzoyldiphenylphosphine oxide, 2,4,6-trimethylbenzoylmethoxyphenylphosphine oxide, 2,4,6-trimethylbenzoylethoxyphenylphosphine oxide, 2,3,5,6-tetramethylbenzoyldiphenylphosphine oxide, benzoyldi(2,6-dimethylphenyl) phosphonates and the like.
- Bisacylphosphine oxides include bis(2,6-dichlorobenzoyl)phenylphosphine oxide, bis(2,6-dichlorobenzoyl)-2,5-dimethylphenylphosphine oxide, bis(2,6-dichlorobenzoyl)- 4-propylphenylphosphine oxide, bis(2,6-dichlorobenzoyl)-1-naphthylphosphine oxide, bis(2,6-dimethoxybenzoyl)phenylphosphine oxide, bis(2,6-dimethoxybenzoyl)-2,4, 4-trimethylpentylphosphine oxide, bis(2,6-dimethoxybenzoyl)-2,5-dimethylphenylphosphine oxide, bis(2,4,6-trimethylbenzoyl)phenylphosphine oxide, bis(2,5,6-trimethyl benzoyl)-2,4,4-trimethylpentylphosphine oxide
- thioxanthones examples include thioxanthone and 2-chlorothioxanthene-9-one.
- ketals examples include benzyl dimethyl ketal and benzyl diethyl ketal.
- ⁇ -diketones examples include diacetyl, benzyl, dl-camphorquinone, 2,3-pentadione, 2,3-octadione, 9,10-phenanthrenequinone, 4,4′-oxybenzyl, and acenaphthenequinone. is mentioned.
- dl-camphorquinone is particularly preferable from the viewpoint of having a maximum absorption wavelength in the visible light region.
- Examples of the coumarins include 3,3′-carbonylbis(7-diethylaminocoumarin), 3-(4-methoxybenzoyl)coumarin, 3-thienoylcoumarin, 3-benzoyl-5,7-dimethoxycoumarin, 3 -benzoyl-7-methoxycoumarin, 3-benzoyl-6-methoxycoumarin, 3-benzoyl-8-methoxycoumarin, 3-benzoylcoumarin, 7-methoxy-3-(p-nitrobenzoyl)coumarin, 3-(p- nitrobenzoyl)coumarin, 3,5-carbonylbis(7-methoxycoumarin), 3-benzoyl-6-bromocoumarin, 3,3′-carbonylbiscoumarin, 3-benzoyl-7-dimethylaminocoumarin, 3-benzoylbenzo [f] coumarin, 3-carboxycoumarin, 3-carboxy-7-methoxycoumarin, 3-ethoxycarbonyl-6-methoxycoumarin, 3-
- 3,3'-carbonylbis(7-diethylaminocoumarin) and 3,3'-carbonylbis(7-dibutylaminocoumarin) are particularly preferred.
- anthraquinones examples include anthraquinone, 1-chloroanthraquinone, 2-chloroanthraquinone, 1-bromoanthraquinone, 1,2-benzanthraquinone, 1-methylanthraquinone, 2-ethylanthraquinone, and 1-hydroxyanthraquinone. .
- benzoin alkyl ether compounds examples include benzoin methyl ether, benzoin ethyl ether, benzoin isopropyl ether, and benzoin isobutyl ether.
- Examples of the ⁇ -aminoketone-based compound include 2-methyl-1-[4-(methylthio)phenyl]-2-morpholinopropan-1-one.
- water-insoluble photopolymerization initiators (B-2) it is preferable to use at least one selected from the group consisting of (bis)acylphosphine oxides, ⁇ -diketones, and coumarins.
- at least one selected from the group consisting of (bis)acylphosphine oxides, ⁇ -diketones, and coumarins As a result, it is possible to obtain a dental composition that exhibits excellent photocurability in the visible and near-ultraviolet regions and exhibits sufficient photocurability even when using any light source such as a halogen lamp, a light emitting diode (LED), or a xenon lamp.
- the content of the water-insoluble photopolymerization initiator (B-2) is not particularly limited, but from the viewpoint of the curability of the resulting dental composition, the polymerizable monomer (A ) to 100 parts by mass, preferably 0.01 to 10 parts by mass, more preferably 0.05 to 7 parts by mass, and even more preferably 0.1 to 5 parts by mass.
- the content of the water-insoluble photopolymerization initiator (B-2) is 10 parts by mass or less, sufficient adhesion can be obtained.
- the water-soluble photopolymerization initiator (B-1) and the water-insoluble photopolymerization initiator (B-2) are used in combination, the water-soluble photopolymerization initiator (B-1) and the water-insoluble photopolymerization initiator in the present invention
- the mass ratio [(B-1):(B-2)] of the agent (B-2) is preferably 10:1 to 1:10, more preferably 7:1 to 1:7, and further Preferably 5:1 to 1:5, most preferably 3:1 to 1:3. If the water-soluble photopolymerization initiator (B-1) is contained at a mass ratio of more than 10:1, the curability of the dental composition itself may be lowered, making it difficult to develop high adhesive strength. be.
- the dental composition of the present invention can contain a chemical polymerization initiator (B-3), preferably an organic peroxide.
- the organic peroxide used as the chemical polymerization initiator is not particularly limited, and known ones can be used. Representative organic peroxides include, for example, ketone peroxides, hydroperoxides, diacyl peroxides, dialkyl peroxides, peroxyketals, peroxyesters, peroxydicarbonates, and the like. Specific examples of these organic peroxides include those described in International Publication No. 2008/087977.
- the chemical polymerization initiator (B-3) may be blended alone or in combination of two or more.
- the dental composition of the present invention contains a filler (C) in order to adjust the handleability and to increase the mechanical strength of the cured product.
- a filler (C) examples include dental surface-treated fillers (C-1) described later; fillers other than dental surface-treated fillers (C-1) such as inorganic fillers, organic fillers, and organic-inorganic composite fillers.
- the filler (C) may be blended alone or in combination of two or more.
- a silane coupling agent (a) comprising a polymerizable monomer (A), a polymerization initiator (B), and a filler (C), wherein the filler (C) has a polymerizable group, And a dental surface-treated filler (C-1) surface-treated with an end capping agent (b) and a filler other than the dental surface-treated filler (C-1), and the dental surface-treated filler (C-1 ) in which the elution amount of metal components in the acid resistance test of ) is less than 100 ppm.
- fillers other than the dental surface treatment filler (C-1) will be described.
- Materials for organic fillers include, for example, polymethyl methacrylate, polyethyl methacrylate, methyl methacrylate-ethyl methacrylate copolymer, crosslinked polymethyl methacrylate, crosslinked polyethyl methacrylate, polyamide, polyvinyl chloride, and polystyrene. , chloroprene rubber, nitrile rubber, ethylene-vinyl acetate copolymer, styrene-butadiene copolymer, acrylonitrile-styrene copolymer, acrylonitrile-styrene-butadiene copolymer, and the like. It can be used as a mixture of two or more.
- the shape of the organic filler is not particularly limited, and the particle size of the filler can be appropriately selected and used. From the viewpoint of handling properties and mechanical strength of the obtained dental composition, the average particle size of the organic filler is preferably 0.001 to 50 ⁇ m, more preferably 0.001 to 10 ⁇ m.
- Inorganic filler materials include various types of glass [silica is the main component, and if necessary, oxides such as heavy metals, boron, and aluminum are included.
- glass powder of general composition such as fused silica, quartz, soda lime silica glass, E glass, C glass, borosilicate glass (Pyrex (registered trademark) glass); barium glass (GM27884, 8235, manufactured by SCHOTT, E-2000, E-3000, manufactured by ESSTECH), strontium borosilicate glass (E-4000, manufactured by ESSTECH), lanthanum glass ceramics (GM31684, manufactured by Schott), fluoroaluminosilicate glass (GM35429, G018-091, G018 -117, manufactured by Schott)], various ceramics, composite oxides such as silica-titania, silica-zirconia, silica-zirconia oxide aggregated filler, diatomaceous earth, kaolin, clay minerals (montmorillonite,
- various glasses composite oxides such as silica-titania and silica-zirconia, silica-zirconia oxide aggregated fillers, silica-coated calcium fluoride with a core-shell structure coated on the surface, and silica core-shell structure ytterbium fluoride surface-coated with silica, core-shell structure yttrium fluoride surface-coated with silica, core-shell structure calcium phosphate surface-coated with silica, core-shell structure sulfuric acid surface-coated with silica Barium, zirconium dioxide with a core-shell structure whose surface is coated with silica, titanium dioxide with a core-shell structure whose surface is coated with silica, and hydroxyapatite with a core-shell structure whose surface is coated with silica are preferable. These may be used individually by 1 type, and may use 2 or more types together. In addition, in this invention, when surface-treating a filler, the average particle diameter of
- the shape of the inorganic filler includes irregular fillers and spherical fillers. From the viewpoint of improving the mechanical strength of the cured product of the dental composition, it is preferable to use a spherical filler as the inorganic filler.
- the spherical filler used in the present invention means that particles observed in a unit field of view of a photograph of the filler taken with an electron microscope are rounded, and the particle diameter in the direction orthogonal to the maximum diameter is divided by the maximum diameter. It is a filler having an average degree of uniformity of 0.6 or more.
- the average particle size of the filler is preferably 0.05-50 ⁇ m, more preferably 0.1-30 ⁇ m, even more preferably 0.5-30 ⁇ m.
- the filling rate of the filler in the dental composition may decrease, resulting in a decrease in mechanical strength.
- the average particle size exceeds 50 ⁇ m, the surface area of the filler is reduced, and a cured product having high mechanical strength may not be obtained.
- agglomerated fillers as inorganic fillers.
- Aggregated filler is a filler that forms secondary particles in which primary particles are aggregated, and expresses high mechanical strength and excellent polishability (a characteristic that desired lubricity can be easily obtained by polishing in a short time). It has the characteristic of letting Aggregated fillers may be used singly or in combination of two or more.
- the aggregated filler is preferably aggregated primary particles of metal oxide.
- the metal oxide may be a composite oxide. Examples of composite oxides include silica-zirconia and silica-titania. As the metal oxide, silica-zirconia oxide is preferable from the viewpoint of ease of polishing of the resulting dental composition.
- the average particle size of the secondary particles of the aggregated filler is 1 to 20 ⁇ m, preferably 1.5 to 15 ⁇ m, more preferably 2 to 12.5 ⁇ m. more preferably 3 to 10 ⁇ m.
- the average particle size of the primary particles of the aggregated filler is preferably 30 to 500 nm, more preferably 40 to 400 nm, even more preferably 50 to 300 nm, from the viewpoint of ease of polishing of the resulting dental composition. ⁇ 200 nm is particularly preferred.
- a commercially available product may be used as the aggregated filler.
- silica-zirconia oxide agglomerated fillers “SG-SZ200G151CMP8”, “SG-SZ50G151CMP8” and “SG-SZ200G154CMP8” (manufactured by Sukgyung AT).
- the organic-inorganic composite filler that may be used in the present invention is obtained by previously adding a polymerizable monomer to the inorganic filler described above, making it into a paste, polymerizing it, and pulverizing it.
- a polymerizable monomer for example, TMPT filler (trimethylolpropane methacrylate and silica filler are mixed, polymerized and pulverized) can be used.
- the shape of the organic-inorganic composite filler is not particularly limited, and the particle size of the filler can be appropriately selected for use. From the viewpoint of handling properties and mechanical strength of the obtained composition, the average particle size of the organic-inorganic composite filler is preferably 0.001 to 50 ⁇ m, more preferably 0.001 to 10 ⁇ m. .
- the average particle size of the filler can be obtained by a laser diffraction scattering method and electron microscope observation of particles.
- the laser diffraction scattering method is convenient for measuring the particle size of 0.1 ⁇ m or more
- the electron microscope observation is convenient for measuring the particle size of ultrafine particles of less than 0.1 ⁇ m.
- 0.1 ⁇ m is a value measured by a laser diffraction scattering method.
- laser diffraction scattering method is measured on a volume basis using a 0.2% sodium hexametaphosphate aqueous solution as a dispersion medium using a laser diffraction particle size distribution analyzer (SALD-2300: manufactured by Shimadzu Corporation). can do.
- SALD-2300 manufactured by Shimadzu Corporation
- electron microscopic observation is performed by taking a photograph of particles with an electron microscope (manufactured by Hitachi, Ltd., S-4000 type), and measuring the particle diameter of the particles (200 or more) observed in the unit field of view of the photograph. , image analysis type particle size distribution measurement software (Mac-View (manufactured by Mountec Co., Ltd.)). At this time, the particle diameter is obtained as an arithmetic mean value of the longest length and the shortest length of the particles, and the average primary particle diameter is calculated from the number of particles and their particle diameters.
- the dental composition of the present invention preferably uses a mixture or combination of two or more fillers having different materials, particle size distributions and morphologies.
- the fillers are densely packed and the number of interaction points between the fillers and the polymerizable monomer or between the fillers increases.
- Different types of fillers may be included in each particle size filler.
- particles other than the filler may be unintentionally contained as impurities within a range that does not impair the effects of the present invention.
- the filler may be used after being previously surface-treated with a known surface-treating agent such as a silane coupling agent, if necessary.
- a known surface-treating agent such as a silane coupling agent
- surface treatment agents include vinyltrimethoxysilane, vinyltriethoxysilane, vinyltrichlorosilane, vinyltri( ⁇ -methoxyethoxy)silane, 3-methacryloyloxypropyltrimethoxysilane, 8-methacryloyloxyoctyltrimethoxysilane, 11-methacryloyloxyundecyltrimethoxysilane, 3-glycidoxypropyltrimethoxysilane, 3-mercaptopropyltrimethoxysilane, 3-aminopropyltriethoxysilane and the like.
- the dental composition of the present invention contains, as filler (C), a silane coupling agent (a) having a polymerizable group (hereinafter sometimes simply referred to as "silane coupling agent (a)") and an endcapping agent. It contains a dental surface-treated filler (C-1) surface-treated by (b) (hereinafter sometimes simply referred to as “dental surface-treated filler (C-1)”). By containing the dental surface treatment filler (C-1), the dental composition has excellent storage stability even under severe conditions (for example, 60° C.
- the elution amount of metal components in the acid resistance test of the dental surface-treated filler (C-1) is less than 100 ppm.
- the elution amount of the metal component is preferably 95 ppm or less, more preferably 90 ppm or less, still more preferably 70 ppm or less, and particularly preferably 50 ppm or less.
- the method for measuring the elution amount of the metal component in the acid resistance test is as described in Examples below.
- the dental surface-treated filler (C-1) preferably has a structure derived from the silane coupling agent (a) and a structure derived from the endcapping agent (b) on the surface of the filler.
- the dental surface-treated filler (C-1) preferably has a structure derived from the silane coupling agent (a) chemically bonded to the surface of the filler. Further, the dental surface-treated filler (C-1) is preferably one in which the structure derived from the endcapping agent (b) is chemically bonded to the surface of the filler. Furthermore, the dental surface-treated filler (C-1) has a structure in which a structure derived from the silane coupling agent (a) and a structure derived from the endcapping agent (b) are chemically bonded to each other. is preferred.
- the dental surface-treated filler (C-1) is also surface-treated with a silane coupling agent (a) having a polymerizable group.
- a silane coupling agent any known silane coupling agent can be used without any particular limitation, but the silane coupling agent represented by the general formula (6) is preferably used.
- R represents a group selected from the group consisting of an alkyl group, an aryl group and an aralkyl group
- X represents a hydroxyl group or hydrolysis
- p represents an integer of 0, 1 or 2.
- multiple R's may be the same or different, and multiple X's may be the same or different. is also good.
- the polymerizable group may be directly bonded to a monovalent organic group, or may be bonded to a monovalent organic group via a divalent group containing a heteroatom such as an oxygen atom or a nitrogen atom.
- the (meth)acryloyl group may form a (meth)acryloyloxy group or a (meth)acrylamide group.
- the number of polymerizable groups that Y has is not particularly limited, but is preferably 1 to 4, more preferably 1 or 2, and even more preferably 1. When Y has multiple polymerizable groups, they may be the same or different.
- Y may be formed only from the polymerizable group, or the functional group and the organic group are bonded directly or indirectly through a divalent group containing a heteroatom such as an oxygen atom or a nitrogen atom.
- the organic group is not particularly limited, and examples thereof include alkyl groups having 1 to 20 carbon atoms, aryl groups having 6 to 18 carbon atoms, and aralkyl groups having 7 to 26 carbon atoms. Among these, an alkyl group having 1 to 20 carbon atoms is preferable, an alkyl group having 1 to 12 carbon atoms is more preferable, and an alkyl group having 1 to 12 carbon atoms is more preferable, since the adhesiveness to both the dental restorative material and the tooth substance is further improved.
- Alkyl groups of -11 are more preferred.
- Examples of the alkyl group having 3 to 11 carbon atoms include n-propyl group, isopropyl group, n-butyl group, n-pentyl group, n-octyl group, n-undecyl group, n-propyl group, An n-pentyl group, an n-octyl group and an n-undecyl group are preferred, and an n-propyl group, an n-octyl group and an n-undecyl group are more preferred.
- Y include (meth)acryloyloxymethyl group, 3-(meth)acryloyloxypropyl group, 3-(meth)acrylamidopropyl group, vinyl group, (meth)allyl group, 3-glycidoxy Propyl groups and the like, (meth) acryloyloxymethyl group, 3- (meth) acryloyloxypropyl group, 3- (meth) acryloyloxyoctyl group, 3- (meth) acryloyloxy undecyl group is preferred, 3- A (meth)acryloyloxypropyl group, an 8-(meth)acryloyloxyoctyl group, and an 11-(meth)acryloyloxyundecyl group are more preferred.
- the type of alkyl group represented by R is not particularly limited, and examples thereof include alkyl groups having 1 to 5 carbon atoms, and more specific examples include methyl group, ethyl group, n-propyl group and isopropyl group. , n-butyl group, n-pentyl group and the like.
- the type of aryl group represented by R is not particularly limited, and examples include aryl groups having 6 to 10 carbon atoms, and more specific examples include phenyl groups and naphthyl groups.
- aralkyl group represented by R is not particularly limited, and examples thereof include aralkyl groups having 7 to 12 carbon atoms, more specifically, benzyl group and the like.
- R is preferably an alkyl group, more preferably an alkyl group having 1 to 5 carbon atoms, and even more preferably a methyl group.
- the hydrolyzable group represented by X can be a group capable of forming a silanol group with the silicon atom to which it is attached by hydrolysis, such as alkoxy groups, acyloxy groups, siloxy groups, halogen atoms etc.
- the type of the alkoxy group is not particularly limited, and examples thereof include alkoxy groups having 1 to 5 carbon atoms. More specific examples include methoxy group, ethoxy group, n-propoxy group, isopropoxy group, n -butoxy group, n-pentyloxy group and the like.
- the type of the acyloxy group is not particularly limited, and examples thereof include acyloxy groups having 1 to 5 carbon atoms. roxy group, n-butanoyloxy group, n-pentanoyloxy group and the like.
- the type of the siloxy group is not particularly limited, and examples thereof include a trimethylsiloxy group.
- halogen atom examples include a chlorine atom and a bromine atom.
- X is preferably an alkoxy group, more preferably an alkoxy group having 1 to 5 carbon atoms, and further preferably a methoxy group or an ethoxy group.
- p represents an integer of 0, 1 or 2, preferably 0 or 1 from the viewpoint of the mechanical strength of the cured product.
- p is 0 or 1
- multiple X may be the same or different
- multiple R may be the same or different.
- silane coupling agent (a) examples include (meth)acryloyloxymethyltrimethoxysilane, 2-(meth)acryloyloxyethyltrimethoxysilane, 3-(meth)acryloyloxypropyltrimethoxysilane, 4 -(meth)acryloyloxybutyltrimethoxysilane, 5-(meth)acryloyloxypentyltrimethoxysilane, 6-(meth)acryloyloxyhexyltrimethoxysilane, 7-(meth)acryloyloxyheptyltrimethoxysilane, 8-( meth) acryloyloxyoctyltrimethoxysilane, 9-(meth)acryloyloxynonyltrimethoxysilane, 10-(meth)acryloyloxydecyltrimethoxysilane, 11-(meth)acryloyloxyundecyltrimethoxys
- the silane coupling agent (a) may be obtained by hydrolyzing and/or condensing them.
- the silane coupling agent (a) may be used alone or in combination of two or more.
- 3-methacryloyloxypropyltrimethoxysilane, 8-(meth)acryloyloxyoctyltrimethoxysilane, 11-(meth)acryloyloxyundecyltrimethoxysilane, and their hydrous Degradants are preferred.
- ⁇ End capping agent (b) The dental surface-treated filler (C-1) is surface-treated with an end-capping agent (b) in addition to the silane coupling agent (a).
- an endcapping agent (b) a compound having a structure represented by the following general formula (1) or (2) and having a boiling point of 180° C. or less is preferable.
- R 1 to R 6 each independently represent a hydrogen atom, a hydroxyl group, an alkyl group having 1 to 9 carbon atoms or an alkoxy group having 1 to 4 carbon atoms.
- x is an integer of 3-10
- y is an integer of 1-100.
- the reaction temperature In order for the silane coupling agent (a) having a polymerizable group to react without being deactivated, the reaction temperature must be 180°C or lower, so the boiling point of the endcapping agent (b) is 180°C. 170° C. or less is preferable, 160° C. or less is more preferable, 155° C. or less is even more preferable, and 150° C. or less is most preferable. From the viewpoint of handleability, the boiling point of the endcapping agent (b) is preferably 50°C or higher, more preferably 60°C or higher, still more preferably 70°C or higher, and most preferably 80°C or higher.
- the dental surface-treated filler (C-1) does not deactivate the polymerizable group of the silane coupling agent (a) by surface treatment with the end capping agent (b), has excellent acid resistance, and It can prevent reaction with a polymerizable monomer having an acidic group. Therefore, even when a dental composition containing a polymerizable monomer having an acidic group contains an X-ray opaque filler, storage stability is maintained even under severe conditions (for example, 60° C. for 4 weeks). Excellent for This is advantageous in that the type of filler (C) is not limited.
- the dental composition of the present invention can be used as a dental cement, a dental bonding material (e.g., orthodontic bonding material, etc.), a dental composite resin (e.g., self-adhesive dental Composite resin, etc.), pit and fissure filling material, loose tooth fixing material, dental abutment building material, etc. The effect of having can be produced.
- a dental bonding material e.g., orthodontic bonding material, etc.
- a dental composite resin e.g., self-adhesive dental Composite resin, etc.
- pit and fissure filling material e.g., self-adhesive dental Composite resin, etc.
- the effect of having can be produced.
- the number of carbon atoms in the alkyl group of R 1 to R 6 is preferably 1 to 5, more preferably 1 to 4, still more preferably 1 to 2, and most preferably 1.
- x is preferably 3 to 6, more preferably 3 to 5, even more preferably 3 to 4, and most preferably 3.
- y is preferably 1 to 10, more preferably 1 to 4, even more preferably 1 to 2, and most preferably 1.
- m is preferably 1 to 5, more preferably 1 to 4, still more preferably 1 to 2, and most preferably 1.
- the alkyl group having 1 to 9 carbon atoms represented by R 1 to R 6 may be linear or branched, such as methyl group, ethyl group, n-propyl group and isopropyl group. , n-butyl group, isobutyl group, tert-butyl group, n-pentyl group, isopentyl group, sec-pentyl group, neopentyl group, n-hexyl group, n-heptyl group, n-octyl group, n-nonyl group, etc. is mentioned.
- a preferred embodiment is a dental composition in which the endcapping agent (b) is a compound having a cyclic siloxane structure represented by formula (1) and a boiling point of 180° C. or less. be done.
- Another preferred embodiment includes a dental composition in which the endcapping agent (b) is a compound having a structure represented by formula (2) and a boiling point of 180° C. or lower. .
- R 1 to R 6 are each independently preferably a hydrogen atom or an alkyl group having 1 to 4 carbon atoms, and are preferably a hydrogen atom or a carbon It is more preferably an alkyl group of number 1 to 3, more preferably a hydrogen atom, a methyl group or an ethyl group, most preferably a hydrogen atom or a methyl group.
- R 1 to R 6 are alkyl groups having 1 to 9 carbon atoms or alkoxy groups having 1 to 4 carbon atoms
- the number of SiH groups is 2 or more is preferable, 3 or more is more preferable, 4 or more is still more preferable, and 5 or more is most preferable.
- R 1 to R 6 when R 1 to R 6 contain alkoxy groups, it is preferable that the number of alkoxy groups directly bonded to the silicon atom is two or more.
- R 1 to R 6 are preferably C 1-4 alkyl groups or C 1-4 alkoxy groups, and C 1-3 alkyl groups or C 1-3 An alkoxy group is more preferable, an alkyl group having 1 to 2 carbon atoms or an alkoxy group having 1 to 2 carbon atoms is more preferable, and an alkoxy group having 1 carbon atom or an alkyl group having 1 carbon atom is most preferable.
- the number of alkoxy groups is preferably 3 or more, more preferably 4 or more, and further preferably 5 or more. Preferably, 6 or more are most preferred.
- the endcapping agent (b) examples include hexamethylcyclotrisiloxane (boiling point: 134°C), octamethylcyclotetrasiloxane (boiling point: 175°C), and 1,1,3,3-tetramethyldisiloxane. (boiling point: 71°C), 1,1,3,3,5,5-hexamethyltrisiloxane (boiling point: 128°C), 1,3-dimethoxytetramethyldisiloxane, and the like.
- the end capping agent (b) may be used alone or in combination of two or more. Among these, hexamethylcyclotrisiloxane is preferable from the viewpoint of reactivity and the like.
- the filler (filler before surface treatment) used in the dental surface-treated filler (C-1) is not particularly limited, but examples thereof include the inorganic filler and the organic-inorganic composite filler described above as the filler (C). Among them, inorganic fillers are preferred.
- Preferable inorganic filler material specifically includes various types of glass [containing silica as a main component and, if necessary, oxides such as heavy metals, boron, and aluminum.
- glass powder of general composition such as fused silica, quartz, soda lime silica glass, E glass, C glass, borosilicate glass (Pyrex (registered trademark) glass), barium glass (GM27884, 8235, manufactured by SCHOTT, E-2000, E-3000, manufactured by ESSTECH), strontium borosilicate glass (E-4000, manufactured by ESSTECH), lanthanum glass ceramics (GM31684, manufactured by SCHOTT), fluoroaluminosilicate glass (GM35429, G018-091, G018 -117, manufactured by SCHOTT)], composite oxides such as silica-titania, silica-zirconia, silica-zirconia oxide aggregated filler, ytterbium fluoride, silica-coated core-shell structure Ytterbium fluoride, silica-coated core-shell yttrium fluoride, barium sulfate, zirconium dioxide, siliclic
- X-ray opacity indicates the property of a substance that does not allow X-rays to pass through, and the X-ray opaque region appears white in an X-ray photograph.
- radio-opacity refers to the ability to distinguish between natural tooth substance and hardened dental compositions using standard dental X-ray equipment in a conventional manner. . When the dental composition contains a radiopaque filler, the dental composition exhibits radiopacity. It is more preferably used than a dental composition containing no sexual filler.
- barium glass, strontium borosilicate glass, lanthanum glass ceramics, fluoroaluminosilicate glass, composite oxides such as silica-zirconia, ytterbium fluoride with a core-shell structure coated with silica, silica - zirconia oxide aggregated fillers are preferred, barium glass, strontium borosilicate glass, lanthanum glass ceramics, fluoroaluminosilicate glass, ytterbium fluoride with a core-shell structure coated with silica on the surface, silica-zirconia oxide aggregated fillers are more preferred . These may be used individually by 1 type, and may use 2 or more types together.
- the dental surface-treated filler (C-1) is obtained by reacting (dehydration condensation) the silane coupling agent (a) and the endcapping agent (b) having a polymerizable group with hydroxyl groups on the surface of the filler. Carrying out the reaction is expressed as “surface treatment”. Moreover, the process of performing surface treatment is expressed as a "surface treatment process.”
- the order of surface treatments for obtaining the dental surface-treated filler (C-1) is not particularly limited.
- the filler may be surface-treated by adding the silane coupling agent (a) and the end capping agent (b) in order, or may be surface-treated by adding them simultaneously.
- the filler may first be reacted with the silane coupling agent (a) and then reacted with the specific end capping agent (b).
- the filler may be first reacted with the end capping agent (b) and then reacted with the silane coupling agent (a).
- a dental surface-treated filler (C-1) is surface-treated with an end-capping agent (b) after being surface-treated with a silane coupling agent (a) having a polymerizable group. be done.
- Surface treatment methods for obtaining a dental surface-treated filler (C-1) include a method in which a silane coupling agent (a) is bonded to the surface of the filler by a dehydration polycondensation reaction, and an end capping agent (b). There is no particular limitation as long as it is a method of binding to the surface of the filler.
- a surface treatment agent containing the silane coupling agent (a) preferably, only the silane coupling agent (a) is added to the solvent.
- the solvent include, but are not particularly limited to, alcoholic solvents such as methanol, ethanol, and isopropanol; water; and mixed solvents thereof.
- an acid such as acetic acid
- the heating temperature is not particularly limited, but may be about 30 to 90.degree.
- a solvent eg, an aqueous solution of acetic acid.
- the heating temperature is not particularly limited, but may be about 30 to 90.degree.
- the reaction temperature is not particularly limited and can be appropriately changed according to the boiling point of the endcapping agent (b), but is preferably 130 to 180°C.
- an acid treatment step (hereinafter simply referred to as " It is preferable to carry out an acid treatment step.
- adsorption of the polymerizable monomer (A-1) having an acidic group can be suppressed.
- the acid used in the acid treatment step is not particularly limited, and may be an organic acid or an inorganic acid.
- Inorganic acids include sulfuric acid, hydrochloric acid, nitric acid, sulfonic acid and the like.
- Organic acids include formic acid, acetic acid, propionic acid, oxalic acid, citric acid, tartaric acid and the like. Among these, inorganic acids are preferable, and hydrochloric acid is more preferable, because they are easy to remove after treatment.
- the acid treatment method is not particularly limited as long as it is a method in which the filler and the acid come into contact with each other.
- a method of stirring the filler in an acidic aqueous solution is preferable.
- the concentration of the acidic aqueous solution used in the acid treatment step is preferably 1-20% by mass, more preferably 1-10% by mass. Further, the amount of the acidic aqueous solution having the above concentration is preferably 100 to 1000 parts by mass with respect to 100 parts by mass of the filler.
- the acid treatment temperature in the acid treatment step is not particularly limited, but is preferably 10 to 60°C.
- the treatment time can be appropriately set according to the acid treatment temperature and the type and amount of acid used. Also, the acid treatment step may be performed repeatedly.
- an acid-treated filler (hereinafter sometimes simply referred to as "acid-treated material"), a step of washing the acid-treated material and/or neutralizing the pH of the acid-treated material or the acid-treated material-containing solution. You may perform the process which makes it near.
- the washing step (hereinafter sometimes simply referred to as “washing step”) is a step of washing with water to remove acid remaining on the surface of the acid-treated material. The washing step can be repeated until residual acid is removed. If there is a large amount of residual acid, the surface treatment may not be performed appropriately in the surface treatment step.
- Examples of the step of making the pH of the acid-treated product or solution containing the acid-treated product near neutral include a method of adding a pH adjuster (such as sodium hydrogen carbonate);
- the filler is first reacted with the silane coupling agent (a) and then reacted with the end capping agent (b). Even after the reaction of (a), it is presumed that there are unreacted reactive groups (hydroxyl groups or hydrolyzable groups) on the filler, so from the viewpoint of increasing the reactivity of the end capping agent (b), silane cup It is preferable to subject the filler surface-treated with the ring agent (a) to the hydrolysis treatment step.
- the filler surface-treated with the silane coupling agent (a) is diluted with an acetic acid solution (aqueous solution of acetic acid or a mixed solvent of water and an organic solvent with acetic acid dissolved therein), followed by adding water.
- acetic acid solution aqueous solution of acetic acid or a mixed solvent of water and an organic solvent with acetic acid dissolved therein
- a method of causing a decomposition reaction can be mentioned.
- Another embodiment includes a dental surface-treated filler (C-1) obtained by hydrolyzing after surface-treating with a silane coupling agent (a) having a polymerizable group.
- a filler surface-treated with a silane coupling agent (a) (preferably a filler surface-treated and hydrolyzed with a silane coupling agent (a)) is subjected to a surface treatment step with an end-capping agent (b).
- a silane coupling agent (a) preferably a filler surface-treated and hydrolyzed with a silane coupling agent (a)
- b an end-capping agent
- the dental surface-treated filler (C-1) is surface-treated with a specific endcapping agent (b) so that unreacted hydrolyzable groups (e.g., unreacted hydroxyl group) can be reduced, the reactivity between the filler and the polymerizable monomer (especially the polymerizable monomer having an acidic group) in the dental composition can be reduced. As a result, a dental composition having excellent storage stability even under severe conditions (for example, 60° C. for 4 weeks) can be obtained. In addition, since the dental surface-treated filler (C-1) has sufficient polymerizable groups on the surface to ensure mechanical strength derived from the silane coupling agent (a), the cured product has sufficient mechanical strength.
- a specific endcapping agent (b) so that unreacted hydrolyzable groups (e.g., unreacted hydroxyl group) can be reduced, the reactivity between the filler and the polymerizable monomer (especially the polymerizable monomer having an acidic group) in the dental composition can be reduced
- the silane coupling agent (a) and the endcapping agent (b) that are not chemically bonded to the surface of the filler but are physically adsorbed are present. From the viewpoint of storage stability and the like, it is preferable to include a step of washing the physically adsorbed components.
- a step of washing the physically adsorbed silane coupling agent (a) and end capping agent (b) after dissolving the physically adsorbed material with a solvent, the solvent is removed using a hollow fiber membrane, filter paper, or the like. method.
- the washing solvent is not particularly limited, but alcoholic solvents such as methanol, ethanol and isopropanol; acetonitrile; water; or mixed solvents thereof.
- the treatment amount of the filler with the silane coupling agent (a) in the surface treatment step for obtaining the dental surface-treated filler (C-1) is 0.5 to 40 parts by mass with respect to 100 parts by mass of the filler before surface treatment. parts, more preferably 1 to 20 parts by mass, even more preferably 2 to 10 parts by mass. If it is less than 0.5 parts by mass, sufficient polymerizable groups cannot be imparted on the surface of the filler, and the mechanical strength may decrease.
- the ring agent (a) may reduce the mechanical strength of the cured product.
- the treatment amount of the filler with the end capping agent (b) in the surface treatment step for obtaining the dental surface-treated filler (C-1) is 0.01 to 20 parts by mass with respect to 100 parts by mass of the filler before surface treatment. is preferred, 0.05 to 15 parts by weight is more preferred, and 0.1 to 10 parts by weight is even more preferred. If it is less than 0.01 part by mass, a sufficient amount of surface treatment cannot be performed on the surface of the filler, and storage stability may not be ensured. If it is more than 20 parts by mass, excessive end capping The agent (b) may reduce the mechanical strength of the cured product.
- a polymerization inhibitor may be added to suppress polymerization of the silane coupling agent (a).
- Known polymerization inhibitors such as 3,5-dibutyl-4-hydroxytoluene (BHT) and p-methoxyphenol (methoquinone) can be used.
- the surface treatment agent used for surface treatment to obtain the dental surface treated filler (C-1) preferably contains only the silane coupling agent (a) and the end capping agent (b).
- a surface treatment agent other than the silane coupling agent (a) and the endcapping agent (b) may be used in combination as long as the effects of the present invention are not impaired.
- the other surface treatment agents include organosilazanes such as 1,1,1,3,3,3-hexamethyldisilazane.
- Drying to obtain the dental surface-treated filler (C-1) can be performed by a conventional method. For example, it may be heated or left under reduced pressure (vacuum).
- a heating device and a decompression device are not particularly limited, and known ones can be used.
- a preferred embodiment includes a polymerizable monomer (A), a polymerization initiator (B), and a filler (C), wherein the filler (C) is a silane coupling agent having a polymerizable group (a ), and a dental surface-treated filler (C-1) surface-treated with an endcapping agent (b), and the endcapping agent (b) is represented by the above formula (1) or (2) and a dental composition that is a compound having a boiling point of 180° C. or lower.
- the filler is surface-treated with a silane coupling agent (a) having a polymerizable group and an endcapping agent (b), and the endcapping agent (b) is A dental surface-treated filler (C-1), which is a compound having a structure represented by the formula (1) or (2) and a boiling point of 180° C. or lower, can be mentioned.
- a preferred embodiment includes a dental surface-treated filler (C-1), in which the filler contains an inorganic filler.
- the dental composition of the present invention may contain only the dental surface-treated filler (C-1) as the filler (C). Moreover, it may contain two or more kinds of dental surface treatment fillers (C-1).
- the content of the dental surface-treated filler (C-1) is 50 to 2000 parts by mass, preferably 100 to 1000 parts by mass, and 125 parts by mass with respect to 100 parts by mass of the monomer component. It is more preferably up to 750 parts by mass, and even more preferably 150 parts by mass to 500 parts by mass.
- the filler (C) may contain a dental surface-treated filler (C-1) and a filler other than the dental surface-treated filler (C-1).
- the fillers other than the dental surface-treated filler (C-1) may be used singly or in combination of two or more.
- the mass ratio of the dental surface-treated filler (C-1) and the filler other than the dental surface-treated filler (C-1) is preferably 10:1 to 1:10, more preferably 8:1 to 1. :8 is more preferred, and 1:5 to 5:1 is even more preferred.
- the content of the filler (C) is not particularly limited, but the preferred content varies depending on the use of the dental composition, as described below.
- the method for producing a dental composition of the present invention comprises a polymerizable monomer (A), a polymerization initiator (B), and a filler (C), and the filler (C) has a polymerizable group.
- the dental composition containing the agent (a) and the dental surface-treated filler (C-1) surface-treated with the endcapping agent (b) is not particularly limited, and a method known to those skilled in the art (mixing , kneading, etc.).
- the method for producing the dental composition of the present invention includes, for example, a step of obtaining the dental surface-treated filler (C-1), wherein the filler is treated with a silane coupling agent (a) having a polymerizable group. and surface treating the filler with an endcapping agent (b).
- the dental composition of the present invention can use a polymerization accelerator (D) together with the polymerization initiator (B).
- the polymerization accelerator (D) used in the present invention include amines, sulfinic acid and salts thereof, borate compounds, barbituric acid compounds, triazine compounds, copper compounds, tin compounds, vanadium compounds, halogen compounds, aldehydes. , thiol compounds, sulfites, hydrogen sulfites, thiourea compounds, and the like.
- Amines used as the polymerization accelerator (D) are classified into aliphatic amines and aromatic amines.
- aliphatic amines include primary aliphatic amines such as n-butylamine, n-hexylamine and n-octylamine; secondary aliphatic amines such as diisopropylamine, dibutylamine and N-methylethanolamine; N-methyldiethanolamine, N-ethyldiethanolamine, Nn-butyldiethanolamine, N-lauryldiethanolamine, 2-(dimethylamino)ethyl methacrylate, N-methyldiethanolamine dimethacrylate, N-ethyldiethanolamine dimethacrylate, triethanolamine monomethacrylate , triethanolamine dimethacrylate, triethanolamine trimethacrylate, triethanolamine, trimethylamine, triethylamine, and tributylamine.
- tertiary alipha such
- aromatic amines include N,N-bis(2-hydroxyethyl)-3,5-dimethylaniline, N,N-bis(2-hydroxyethyl)-p-toluidine, N,N-bis (2-hydroxyethyl)-3,4-dimethylaniline, N,N-bis(2-hydroxyethyl)-4-ethylaniline, N,N-bis(2-hydroxyethyl)-4-isopropylaniline, N, N-bis(2-hydroxyethyl)-4-t-butylaniline, N,N-bis(2-hydroxyethyl)-3,5-diisopropylaniline, N,N-bis(2-hydroxyethyl)-3, 5-di-t-butylaniline, N,N-dimethylaniline, N,N-dimethyl-p-toluidine, N,N-dimethyl-m-toluidine, N,N-diethyl-p-toluidine, N,N,
- sulfinic acid and its salts include those described in International Publication No. 2008/087977.
- the above polymerization accelerator (D) may contain one type alone, or may contain two or more types in combination.
- the content of the polymerization accelerator (D) used in the present invention is not particularly limited. 0.001 to 30 parts by mass is preferable, 0.01 to 10 parts by mass is more preferable, 0.05 to 20 parts by mass is more preferable, and 0.1 to 5 parts by mass is particularly preferable.
- the content of the polymerization accelerator (D) is 0.001 parts by mass or more, the polymerization proceeds sufficiently to obtain desired adhesiveness, and it is more preferably 0.05 parts by mass or more.
- the content of the polymerization accelerator (D) is 30 parts by mass or less, it is more preferably 20 parts by mass or less because sufficient adhesion can be obtained.
- the dental composition of the present invention may further contain a fluoride ion releasing substance.
- a fluoride ion-releasing substance By containing a fluoride ion-releasing substance, a dental composition capable of imparting acid resistance to tooth substance can be obtained.
- fluoride ion-releasing substances include metal fluorides such as sodium fluoride, potassium fluoride, sodium monofluorophosphate, lithium fluoride, and ytterbium fluoride.
- the fluoride ion-releasing substance may contain one type alone, or may contain two or more types in combination.
- the dental composition of the present invention can contain known additives within a range that does not impair its performance.
- additives include polymerization inhibitors, antioxidants, pigments, dyes, ultraviolet absorbers, organic solvents, thickeners, and the like.
- An additive may be used individually by 1 type, and may use 2 or more types together.
- polymerization inhibitors examples include hydroquinone, hydroquinone monomethyl ether, dibutylhydroquinone, dibutylhydroquinone monomethyl ether, t-butylcatechol, 2-t-butyl-4,6-dimethylphenol, 2,6-di-t-butylphenol, 3,5-di-t-butyl-4-hydroxytoluene and the like.
- the content of the polymerization inhibitor is preferably 0.001 to 1.0 parts by mass with respect to 100 parts by mass of the polymerizable monomer (A) in the dental composition.
- the dental composition of the present invention may contain a solvent.
- Water, an organic solvent, etc. are mentioned as a solvent.
- the solvent is preferably used in the form of a mixed solvent of water and an organic solvent. Moreover, depending on the embodiment, the inclusion of the organic solvent may not be required.
- the demineralizing effect of the polymerizable monomer (A-1) having an acidic group on tooth substance is promoted. It is necessary to use water that does not substantially contain impurities that adversely affect adhesion, and distilled water or ion-exchanged water is preferred. If the water content is too small, the demineralization promotion effect may not be sufficiently obtained, and if it is too large, the adhesiveness may be lowered.
- the content of water is preferably 1 to 500 parts by mass, more preferably 5 to 300 parts by mass, more preferably 10 to 200 parts by mass with respect to 100 parts by mass of the polymerizable monomer (A) of the dental composition. Parts by mass are more preferred.
- the dental composition of the present invention contains an organic solvent
- the organic solvent usually has a boiling point of 150° C. or lower under normal pressure, and a solubility in water at 25° C. of 5% by mass or more, preferably 30% by mass or more, and more preferably water in any proportion.
- An organic solvent capable of dissolving in is used.
- organic solvents examples include methanol, ethanol, 1-propanol, 2-propanol, 1-butanol, 2-methyl-2-propanol, acetone, methyl ethyl ketone, tetrahydrofuran, diethyl ether, diisopropyl ether, hexane, toluene, chloroform, acetic acid.
- Ethyl, butyl acetate and the like can be mentioned.
- the organic solvent is preferably a water-soluble organic solvent, specifically ethanol, 2-propanol, 2 -methyl-2-propanol, acetone and tetrahydrofuran are preferred, ethanol, 2-propanol, 2-methyl-2-propanol and tetrahydrofuran are more preferred.
- the total content of the solvent in one embodiment is preferably 1 to 2000 parts by mass, more preferably 2 to 1000 parts by mass, and 3 to 500 parts by mass is more preferable.
- the dental composition of the present invention preferably contains each component such that the pH of the liquid (composition) is in the range of 1.5 to 4.0. More preferably, the pH is in the range of 3.5, and more preferably in the range of 2.0 to 3.0. If the pH of the composition is less than 1.5, excessive demineralization may occur during so-called total etching, which is applied to the tooth surface after phosphoric acid etching treatment, and adhesion may be reduced. On the other hand, if the pH of the composition exceeds 4.0, the adhesion during self-etching may be reduced due to the reduced demineralization action.
- the dental composition of the present invention includes, for example, dental cement, dental bonding material (e.g., orthodontic bonding material, etc.), dental composite resin (e.g., self-adhesive dental composite resin, etc.), pit and fissure It can be used for dental treatments such as filling materials, loose tooth fixing materials, and dental abutment construction materials. ), it is preferably used as a dental abutment construction material or a dental bonding material. Also in these applications, by including the dental surface treatment filler (C-1), it has excellent acid resistance and prevents it from reacting with polymerizable monomers (especially polymerizable monomers having an acidic group).
- dental bonding material e.g., orthodontic bonding material, etc.
- dental composite resin e.g., self-adhesive dental composite resin, etc.
- pit and fissure It can be used for dental treatments such as filling materials, loose tooth fixing materials, and dental abutment construction materials.
- it is preferably used as a dental abut
- the dental surface-treated filler (C-1) in other components to be blended, so storage is possible even under severe conditions (for example, 60° C. for 4 weeks). Excellent stability.
- the dental surface-treated filler (C-1) the surface has polymerizable groups sufficient to ensure mechanical strength derived from the silane coupling agent (a).
- the cured product has sufficient mechanical strength.
- the components of the dental composition of the present invention may be combined into one bottle type or one paste type, or divided into two and used as a two bottle type or two paste type. Specific embodiments of application of the dental composition are shown below.
- One preferred embodiment of the dental composition of the present invention is a self-adhesive dental composite resin.
- the polymerization initiator (B) preferably contains a photopolymerization initiator, and the polymerization initiator (B) is a water-soluble photopolymerization initiator (B-1) and a water-insoluble photopolymerization initiator (B-2). more preferably.
- a pretreatment material may be used. It doesn't have to be.
- a self-adhesive dental composite resin containing only the dental composition of the present invention without containing a pretreatment material can be obtained.
- the content of each component in the self-adhesive dental composite resin is 1 to 50 of the polymerizable monomer (A-1) having an acidic group per 100 parts by mass of the polymerizable monomer (A) in the dental composition.
- Parts by mass including 20 to 99 parts by mass of a hydrophobic polymerizable monomer (A-2a) having no acidic group and 0 to 50 parts by mass of a hydrophilic polymerizable monomer (A-2b) having no acidic group
- a dental composition used as a self-adhesive dental composite resin may not contain the hydrophilic polymerizable monomer (A-2b).
- ⁇ Dental cement> Another preferred embodiment of the dental composition of the present invention is a dental cement.
- Suitable dental cements include resin cement, glass ionomer cement, resin-reinforced glass ionomer cement, and the like.
- a self-etching primer or the like may be used first as a pretreatment material.
- the dental composition of the present invention when used as dental cement, it contains a polymerizable monomer (A), a polymerization initiator (B), a dental surface treatment filler (C-1) and a polymerization accelerator (D).
- the polymerizable monomer (A) is a polymerizable monomer (A-1) having an acidic group, a hydrophobic polymerizable monomer (A-2a) having no acidic group, a hydrophilic having no acidic group It preferably contains a polymerizable monomer (A-2b).
- the polymerization initiator (B) preferably contains a chemical polymerization initiator, and more preferably uses a combination of a chemical polymerization initiator and a photopolymerization initiator.
- the photopolymerization initiator it is preferable to use a water-soluble photopolymerization initiator (B-1) and a water-insoluble photopolymerization initiator (B-2) in combination.
- each component in the dental cement is as follows: 0 to 50 parts by mass of the polymerizable monomer (A-1) having an acidic group per 100 parts by mass of the polymerizable monomer (A) in the dental composition; Hydrophobic polymerizable monomer having no group (A-2a) 50 to 99 parts by weight, hydrophilic polymerizable monomer having no acidic group (A-2b) preferably contains 0 to 50 parts by weight, 0 to 40 parts by mass of a polymerizable monomer (A-1) having an acidic group, 60 to 99 parts by mass of a hydrophobic polymerizable monomer (A-2a) having no acidic group, and hydrophilicity having no acidic group It is more preferable to contain 0 to 40 parts by mass of the polymerizable monomer (A-2b), 0 to 30 parts by mass of the polymerizable monomer (A-1) having an acidic group, and hydrophobic polymerization having no acidic group.
- a hydrophilic monomer (A-2a) It is more preferable to contain 70 to 99 parts by mass of a hydrophilic monomer (A-2a) and 0 to 30 parts by mass of a hydrophilic polymerizable monomer (A-2b) having no acidic group. Further, with respect to 100 parts by mass of the polymerizable monomer (A), 0.001 to 30 parts by mass of a polymerization initiator (B), 50 to 2000 parts by mass of a dental surface treatment filler (C-1), and a polymerization accelerator Agent (D) 0.001 to 20 parts by mass, polymerization initiator (B) 0.05 to 10 parts by mass, dental surface treatment filler (C-1) 100 to 1500 parts by mass, and polymerization accelerator It is more preferable to contain 0.05 to 10 parts by mass of the agent (D).
- the hydrophilic polymerizable monomer (A-2b) may not be contained, and in the case of a type using a pretreatment material, the polymerizable monomer (A-1) having an acid
- the dental bonding material can be made by combining the demineralization process, the permeation process, and the curing process in one step.
- Examples of dental bonding materials include a two-bottle type in which two liquids, which are divided into liquids A and B, are mixed and used immediately before use, and a one-bottle type in which liquid one can be used as it is. Among them, the one-bottle type is more advantageous in terms of use because the process is simpler.
- a self-etching primer or the like may be used as a pretreatment material for the dental bonding material.
- the dental composition used for the present dental bonding material contains a polymerizable monomer (A), a polymerization initiator (B), a dental surface treatment filler (C-1) and a polymerization accelerator (D),
- the polymerizable monomer (A) is a polymerizable monomer (A-1) having an acidic group, a hydrophobic polymerizable monomer (A-2a) having no acidic group, and a hydrophilic polymerization having no acidic group. It preferably contains a functional monomer (A-2b) and a solvent.
- the polymerization initiator (B) preferably contains a photopolymerization initiator, and the polymerization initiator (B) is a water-soluble photopolymerization initiator (B-1) and a water-insoluble photopolymerization initiator (B-2). more preferably.
- each component in the dental bonding material is 1 to 90 parts by mass of the polymerizable monomer (A-1) having an acidic group in 100 parts by mass of the polymerizable monomer (A) in the dental composition, It preferably contains 40 to 96 parts by mass of a hydrophobic polymerizable monomer (A-2a) having no acidic group and 3 to 50 parts by mass of a hydrophilic polymerizable monomer (A-2b) having no acidic group.
- 0.001 to 30 parts by mass of a water-soluble photopolymerization initiator (B-1) and 0.001 to 30 parts by mass of a water-insoluble photopolymerization initiator (B-2) are added to 100 parts by mass of the polymerizable monomer (A).
- water-insoluble photopolymerization initiator (B-1) 0.05 to 10 parts by weight
- water-insoluble photopolymerization initiator (B-2) 0.05 to 10 parts by weight
- polymerization accelerator (D) 0.05 to 10 parts by weight parts, 3 to 75 parts by mass of the dental surface treatment filler (C-1), and 2 to 1000 parts by mass of the solvent.
- One preferred embodiment of the dental composition of the present invention is a dental composite resin (excluding self-adhesive dental composite resins).
- a dental composite resin excluding self-adhesive dental composite resins.
- the dental composition of the present invention is used as a dental composite resin, a polymerizable monomer (A), a polymerization initiator (B), a dental surface treatment filler (C-1), and a polymerization accelerator (D) including.
- the polymerization initiator (B) preferably contains a photopolymerization initiator
- the polymerization initiator (B) is a water-soluble photopolymerization initiator (B-1) and a water-insoluble photopolymerization initiator (B-2). more preferably.
- the content of each component in the dental composite resin is 20 to 100 parts of the hydrophobic polymerizable monomer (A-2a) having no acidic group in 100 parts by mass of the polymerizable monomer (A) in the dental composition.
- Parts by mass preferably containing 0 to 80 parts by mass of a hydrophilic polymerizable monomer (A-2b) having no acidic group, and a hydrophobic polymerizable monomer (A-2a) having no acidic group from 40 to 100 parts by mass, more preferably 0 to 40 parts by mass of a hydrophilic polymerizable monomer (A-2b) having no acidic group, and a hydrophobic polymerizable monomer (A-2a) having no acidic group More preferably, it contains 60 to 100 parts by mass, and 0 to 30 parts by mass of a hydrophilic polymerizable monomer (A-2b) having no acidic group.
- a polymerization accelerator (D) preferably contains 0.001 to 20 parts by mass, polymerization initiator (B) 0.05 to 10 parts by mass, dental surface treatment filler (C-1) 100 to 1500 parts by mass, and polymerization accelerator It is more preferable to contain (D) 0.05 to 10 parts by mass.
- a dental composition used as a dental composite resin may not contain the hydrophilic polymerizable monomer (A-2b).
- ⁇ Dental abutment construction material> Another preferred embodiment of the dental composition of the present invention is a dental abutment building material.
- Resin cement is exemplified as a suitable dental abutment building material.
- a self-etching primer or the like may be used as a pretreatment material for the dental abutment building material.
- the polymerization initiator (B) preferably contains a chemical polymerization initiator, and more preferably uses a combination of a chemical polymerization initiator and a photopolymerization initiator.
- the photopolymerization initiator it is preferable to use a water-soluble photopolymerization initiator (B-1) and a water-insoluble photopolymerization initiator (B-2) in combination.
- the content of each component in the dental abutment building material is 0 to 50 mass parts of the polymerizable monomer (A-1) having an acidic group per 100 mass parts of the polymerizable monomer (A) in the dental composition.
- a polymerizable monomer having an acidic group (A-1) 0 to 40 parts by mass
- a hydrophobic polymerizable monomer (A-2a) and 0 to 30 parts by mass of a hydrophilic polymerizable monomer (A-2b) having no acidic group It is more preferable to contain 70 to 99 parts by mass of a hydrophobic polymerizable monomer (A-2a) and 0 to 30 parts by mass of a hydrophilic polymerizable monomer (A-2b) having no acidic group. Further, with respect to 100 parts by mass of the polymerizable monomer (A), 0.001 to 30 parts by mass of a polymerization initiator (B), 50 to 2000 parts by mass of a dental surface treatment filler (C-1), and a polymerization accelerator Agent (D) 0.001 to 20 parts by mass, polymerization initiator (B) 0.05 to 10 parts by mass, dental surface treatment filler (C-1) 100 to 1500 parts by mass, and polymerization accelerator It is more preferable to contain 0.05 to 10 parts by mass of the agent (D).
- any of the preferred embodiments of the above-described self-adhesive dental composite resin, dental cement, dental composite resin, dental abutment building material, and dental bonding material Therefore, the content of each component can be changed as appropriate, and any component can be changed such as by addition or deletion.
- the present invention includes embodiments in which the above configurations are combined in various ways within the scope of the technical idea of the present invention as long as the effects of the present invention are exhibited.
- Production Example 2 Production of Filler 2 Filler 2 was produced in the same manner as in Production Example 1, except that the raw material was changed from 8235 UF0.7 grade to GM27884 NF180 grade (SCHOTT barium glass, average particle size: 0.18 ⁇ m). manufactured.
- Production Example 4 Production of Filler 4 Silica stone powder (manufactured by Nitschitsu Co., Ltd., quartz, trade name: Hi-Silica) was pulverized with a ball mill to obtain pulverized silica powder. The average particle size of the pulverized silica powder obtained was measured on a volume basis using a laser diffraction particle size distribution analyzer (manufactured by Shimadzu Corporation, model "SALD-2300”) and found to be 2.2 ⁇ m. Filler 4 was produced in the same manner as in Production Example 1, except that this filler was used as a raw material instead of 8235 UF0.7 grade.
- SALD-2300 laser diffraction particle size distribution analyzer
- Production Example 5 Production of Filler 5 Filler 5 was produced using the same raw materials and method as in Production Example 1, except that the hydrolysis treatment step was omitted.
- Production Example 6 Production of Filler 6 Filler 6 was produced using the same raw materials and method as in Production Example 1, except that the hydrochloric acid treatment step was omitted.
- Production Example 7 Production of Filler 7 After the hydrochloric acid treatment step, the surface treatment step with the end capping agent (b) in Production Example 1 and the surface treatment step with the silane coupling agent (a) are performed in that order, using 8235 UF0.7 grade. Filler 7 was produced.
- Production Example 8 Production of Filler 8
- Surface-treated silica-zirconia oxide aggregated filler (trade name “SG-SZ200G151CMP8”, average particle size of primary particles: 200 nm, average particle size of secondary particles: 5.2 ⁇ m, refractive index : 1.51, constituent components: SiO 2 , ZrO 2 , manufactured by Sukgyung AT) are hydrolyzed in the same manner as in Production Example 1, and the surface treatment step is performed with the end capping agent (b) to produce filler 8. bottom.
- Production Example 9 Production of Filler 9 Filler 9 was produced using the same raw materials and method as in Production Example 1, except that the surface treatment step with the silane coupling agent (a) and the hydrolysis treatment step were omitted.
- Production Example 10 Production of Filler 10 Filler 10 was produced by treating 8235 UF0.7 grade only in the surface treatment step with the silane coupling agent (a) of Production Example 1.
- Production Example 11 Production of Filler 11 Filler 11 was produced by treating 8235 UF 0.7 grade only with the hydrochloric acid treatment step of Production Example 1 and the surface treatment step with the silane coupling agent (a).
- Production Example 12 Production of Filler 12 Filler 12 was produced by treating GM27884 NF180 grade only with the hydrochloric acid treatment step of Production Example 1 and the surface treatment step with the silane coupling agent (a).
- Production Example 13 Production of Filler 13 8235 UF0.7 grade was subjected to the hydrochloric acid treatment step of Production Example 1, the surface treatment step with the silane coupling agent (a), and the hydrolysis treatment step, followed by the following steps. and made filler 13.
- Production Example 14 Production of Filler 14 8235 UF0.7 grade was subjected to the hydrochloric acid treatment step of Production Example 1, the surface treatment step with the silane coupling agent (a), and the hydrolysis treatment step, followed by the following steps. and made a filler 14.
- ⁇ Surface treatment step with 1,1,1,3,3,3-hexamethyldisilazane 100 g of filler obtained in the above step, 200 mL of isopropanol, 4 g of 1,1,1,3,3,3-hexamethyldisilazane was added to a three-necked flask and reacted at 40° C. for 72 hours.
- Production Example 15 Production of Filler 15 OX50 (Nippon Aerosil Co., Ltd., ultrafine silica "Aerosil (registered trademark) OX50", average particle size: 0.04 ⁇ m) 100 g, 3-methacryloyloxypropyltrimethoxysilane 7 g, and 0 200 mL of a 3% by mass acetic acid aqueous solution was placed in a three-necked flask and stirred for 2 hours at room temperature. After water was removed by freeze-drying, heat treatment was performed at 80° C. for 5 hours to obtain filler 15 (silane-treated silica).
- OX50 Natural Aerosil Co., Ltd., ultrafine silica "Aerosil (registered trademark) OX50", average particle size: 0.04 ⁇ m
- Examples 1-1 to 1-11 and Comparative Examples 1-1 to 1-6 (Preparation of dental compositions)
- the raw materials shown in Tables 1 and 2 were mixed and kneaded at room temperature (23°C) in the dark to prepare a paste-like dental composition (dental composite resin), and the properties were obtained according to the methods of Test Examples 1 and 2 below. examined.
- the properties of the fillers produced according to each Production Example were examined according to the method of Test Example 3.
- the results are shown in Tables 1-2.
- FIG. 1 shows the structure of the surface of the surface-treated filler (filler 9) obtained in Production Example 9.
- FIG. 2 shows the structure of the surface of the dental surface-treated filler (C-1) (filler 1) obtained in Production Example 1.
- FIG. 1 shows the structure of the surface of the dental surface-treated filler (filler 9) obtained in Production Example 9.
- a universal testing machine Autograph AG-I 100 kN, manufactured by Shimadzu Corporation
- Test Example 2 Shear adhesion test on bovine dentin
- the lip surface of bovine mandibular anterior teeth was polished with #80 silicon carbide paper (manufactured by Nihon Kenshi Co., Ltd.) under running water to expose the flat surface of the dentin.
- Bovine mandibular anterior teeth were obtained.
- a tape was attached to the bottom surface of a 15-hole mold (15-hole mold, manufactured by Ultradent, ⁇ 35 mm ⁇ height 25 mm), and the teeth prepared as described above were fixed thereon.
- the mold was filled with gypsum and allowed to stand still for about 30 minutes to harden the gypsum to obtain a composite of the bovine mandibular anterior teeth and gypsum.
- the composite was removed from the mold as a sample.
- the samples were such that the front teeth of the bovine mandible were exposed on the upper surface of the gypsum.
- the upper surface of the front teeth of the bovine mandible was polished under running water with #600 silicon carbide paper (manufactured by Nihon Kenshi Co., Ltd.) to a size ( ⁇ 2.38 mm or more) that can secure the adherend surface. Washed with sonic water for 5 minutes.
- a ⁇ 2.38 mm CR filling mold (Bonding Mold Insert, manufactured by Ultradent) was attached to a special tool (Bonding Clamp, manufactured by Ultradent), and the mold was lowered to bring it into close contact with the adherend surface of the sample.
- the dental composition immediately after preparation in each example and comparative example was thinly filled into the hole of the mold to a thickness of 1 mm or less, and immediately filled into the mold (up to about 2/3 of the mold, 2 mm thick), left for 10 seconds, and then irradiated with light for 10 seconds using a dental LED light irradiator (manufactured by Ultradent, trade name "VALO”) to cure the dental composition.
- the sample was removed from the mold and used as an adhesion test sample.
- the adhesion test sample was immersed in distilled water in the sample container, left in a constant temperature chamber set at 37° C. for 24 hours, and then taken out to measure the adhesion strength.
- the dental composition prepared in each example and comparative example and stored at 60 ° C.
- Test Example 3 Acid resistance test For each of fillers 1 to 14, 0.5 g of filler was added to a 5% acetic acid aqueous solution, and ultrasonically dispersed for 5 minutes (Branson desktop ultrasonic cleaner Bransonic (registered trademark) M2800-J, 110W, manufactured by Yamato Scientific Co., Ltd.) and allowed to stand at room temperature for 6 hours. Next, in order to remove the filler, the filler was sedimented with a centrifuge (20,000 rpm, 30 minutes, himac CR21GII, manufactured by Eppendorf Himac Technologies, Inc.), and the supernatant was quickly recovered without leaving time. .
- a centrifuge 20,000 rpm, 30 minutes, himac CR21GII, manufactured by Eppendorf Himac Technologies, Inc.
- filler 15 was excluded from evaluation of acid resistance, the acid resistance test of filler (C) other than dental surface treatment filler (C-1) in Table 2 is the result of acid resistance test of fillers 9 to 14. represents The smaller the amount of metal elements detected in this acid resistance test, the more inhibited the interaction between the acidic component and the filler. It is suggested.
- the dental compositions of Examples had a bending strength of 94 MPa or more in the cured product, which was excellent in mechanical strength.
- the shear bond strength to bovine dentin is 5 MPa or more, indicating excellent storage stability.
- Comparative Examples 1-1 to 1-6 which did not contain the dental surface treatment filler (C-1) among the dental compositions of Comparative Examples, Comparative Examples 1-1 has an insufficient bending strength of 60 MPa, and in Comparative Examples 1-2 to 1-6, the adhesive strength to bovine dentin after storage at 60 ° C. for 4 weeks is 1 MPa or less, which is severe. It was confirmed that the storage stability under the conditions was low.
- the filler 11 used in Comparative Example 1-3 and the filler 12 used in Comparative Example 1-4 were treated with hydrochloric acid and surface-treated with a silane coupling agent (a). 2011-178778). Further, the filler 14 used in Comparative Examples 1-6 corresponds to Patent Document 4 (International Publication No. 2018/074594). Furthermore, in the acid resistance test, the dental surface treatment filler (C-1) of the example has an excellent acid resistance of less than 93 ppm, whereas the dental surface treatment fillers (C The fillers other than -1) were confirmed to have a large amount of eluted metal components of 300 ppm or more.
- the surface of the dental surface-treated filler (C-1) of the present invention is more densely covered with organic molecules. It is believed that the inhibition of the interaction between the polymerizable monomer having an acidic group and the filler resulted in a dental composition having excellent storage stability even under severe conditions.
- the dental composition according to the present invention is suitable as a dental cement, a dental bonding material, a dental composite resin (for example, a self-adhesive dental composite resin), a dental abutment building material, etc. in the field of dental treatment. used for
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Abstract
Description
[1]重合性単量体(A)、重合開始剤(B)、及びフィラー(C)を含み、
前記フィラー(C)が、重合性基を有するシランカップリング剤(a)、及びエンドキャッピング剤(b)によって表面処理された歯科用表面処理フィラー(C-1)を含み、かつ
前記歯科用表面処理フィラー(C-1)の耐酸性試験における金属成分の溶出量が100ppm未満である、歯科用組成物。
[2]前記エンドキャッピング剤(b)が、下記式(1)、又は(2)で示される構造を有し、かつ沸点が180℃以下である化合物である、[1]に記載の歯科用組成物。
[3]前記歯科用表面処理フィラー(C-1)が、前記重合性基を有するシランカップリング剤(a)によって表面処理された後に、前記エンドキャッピング剤(b)によって表面処理されてなる、[1]又は[2]に記載の歯科用組成物。
[4]前記歯科用表面処理フィラー(C-1)が、前記重合性基を有するシランカップリング剤(a)によって表面処理された後に、加水分解されてなる、[1]~[3]のいずれかに記載の歯科用組成物。
[5]前記歯科用表面処理フィラー(C-1)がX線不透過性フィラーを含む、[1]~[4]のいずれかに記載の歯科用組成物。
[6]前記X線不透過性フィラーが酸処理されてなる、[5]に記載の歯科用組成物。
[7]前記重合性基を有するシランカップリング剤(a)が3-メタクリロイルオキシプロピルトリメトキシシラン、8-(メタ)アクリロイルオキシオクチルトリメトキシシラン、11-(メタ)アクリロイルオキシウンデシルトリメトキシシラン及び、これらの加水分解物を含む、[1]~[6]のいずれかに記載の歯科用組成物。
[8]前記エンドキャッピング剤(b)がヘキサメチルシクロトリシロキサンである、[1]~[7]のいずれかに記載の歯科用組成物。
[9]前記歯科用表面処理フィラー(C-1)を得るための表面処理におけるフィラーに対する前記エンドキャッピング剤(b)による処理量が、表面処理前のフィラー100質量部に対して、0.01~20質量部である、[1]~[8]のいずれかに記載の歯科用組成物。
[10]前記重合性単量体(A)が、酸性基を有する重合性単量体(A-1)、及び酸性基を有しない重合性単量体(A-2)を含む、[1]~[9]のいずれかに記載の歯科用組成物。
[11]前記酸性基を有する重合性単量体(A-1)の含有量が、重合性単量体(A)100質量部中、1~40質量部である、[10]に記載の歯科用組成物。
[12][1]~[11]のいずれかに記載の歯科用組成物からなる、自己接着性歯科用コンポジットレジン。
[13][1]~[11]のいずれかに記載の歯科用組成物からなる、歯科用ボンディング材。
[14][1]~[11]のいずれかに記載の歯科用組成物からなる、歯科用セメント。
[15][1]~[11]のいずれかに記載の歯科用組成物からなる、歯科用コンポジットレジン。
[16][1]~[11]のいずれかに記載の歯科用組成物からなる、歯科用支台築造材料。
[17]前記歯科用表面処理フィラー(C-1)を得る工程を備え、
前記工程が、重合性基を有するシランカップリング剤(a)によってフィラーを表面処理する工程、エンドキャッピング剤(b)によって前記フィラーを表面処理する工程を含む、[1]~[11]のいずれかに記載の歯科用組成物の製造方法。
[18]重合性基を有するシランカップリング剤(a)、及びエンドキャッピング剤(b)によってフィラーが表面処理されてなり、かつ
前記エンドキャッピング剤(b)が下記式(1)、又は(2)で示される構造を有し、かつ沸点が180℃以下である化合物である、歯科用表面処理フィラー(C-1)。
[19]前記フィラーが、無機フィラーを含む、[18]に記載の歯科用表面処理フィラー(C-1)。
[20]前記無機フィラーが、凝集フィラーを含む、[19]に記載の歯科用表面処理フィラー(C-1)。
[21]前記重合性基を有するシランカップリング剤(a)によって表面処理された後に、前記エンドキャッピング剤(b)によって表面処理されてなる、[18]~[20]のいずれかに記載の歯科用表面処理フィラー(C-1)。
[22]前記重合性基を有するシランカップリング剤(a)によって表面処理された後に、加水分解されてなる、[18]~[21]のいずれかに記載の歯科用表面処理フィラー(C-1)。
また、本発明の歯科用組成物は、このような優れた特性を有することから、自己接着性歯科用コンポジットレジン、歯科用ボンディング材、歯科用セメント、歯科用コンポジットレジン、歯科用支台築造材料などに好適に用いられる。
まず、特定の構造かつ沸点が180℃以下であるエンドキャッピング剤(b)を気相状態でフィラーと反応させることで他の表面処理剤、及び液相での反応と比較して反応率を高くできる。さらに沸点が180℃以下のエンドキャッピング剤(b)を使用することにより、重合性基が失活しない温度でフィラー表面との反応を実施することが可能である。その結果、重合性基を有するシランカップリング剤(a)、及び特定の構造かつ沸点が180℃以下であるエンドキャッピング剤(b)によって処理された表面処理フィラー(C-1)は、機械的強度の確保に十分な重合性基を表面に有しつつ従来の手法で表面処理された表面処理フィラーと比較して、フィラーの表面が有機分子でより緻密に覆われていることが推定される。したがって、表面処理フィラー(C-1)と他の構成成分との相互作用が防がれるため、良好な保存安定性が長期間維持されるものと考えられる。
本発明の歯科用組成物に用いられる重合性単量体(A)には、ラジカル重合性単量体が好適に用いられる。重合性単量体(A)におけるラジカル重合性単量体の具体例としては、(メタ)アクリレート系重合性単量体、(メタ)アクリルアミド系重合性単量体、α-シアノアクリル酸、(メタ)アクリル酸、α-ハロゲン化アクリル酸、クロトン酸、桂皮酸、ソルビン酸、マレイン酸、イタコン酸等のエステル類、ビニルエステル類、ビニルエーテル類、モノ-N-ビニル誘導体、スチレン誘導体等が挙げられる。これらの中でも、硬化性の観点から(メタ)アクリレート系重合性単量体、(メタ)アクリルアミド系重合性単量体が好ましい。さらに、歯質に対する接着性、及び弾性率の観点から、本発明の歯科用組成物において、重合性単量体(A)は、酸性基を有する重合性単量体(A-1)、及び酸性基を有しない重合性単量体(A-2)を含有することが好ましい。
歯質に対する接着性を付与するために、酸性基を有する重合性単量体(A-1)が好ましい。本発明に用いられる酸性基を有する重合性単量体(A-1)としては、例えば、リン酸基、ピロリン酸基、チオリン酸基、ホスホン酸基、カルボン酸基、スルホン酸基等の酸性基を少なくとも1個有する重合性単量体が挙げられる。酸性基を有する重合性単量体(A-1)は、1種単独で又は2種以上を適宜組み合わせて使用することができる。酸性基を有する重合性単量体(A-1)の具体例を下記する。
本発明における酸性基を有しない重合性単量体(A-2)としては、25℃の水に対する溶解度が10質量%未満である酸性基を有しない疎水性重合性単量体(A-2a);25℃の水に対する溶解度が10質量%以上である酸性基を有しない親水性重合性単量体(A-2b)が挙げられる。酸性基を有しない重合性単量体(A-2)は1種を単独で用いてもよく、2種以上を併用してもよい。
酸性基を有しない疎水性重合性単量体(A-2a)(以下、単に「疎水性重合性単量体(A-2a)」と称することがある)は、歯科用組成物のハンドリング性、硬化物の機械的強度などを向上させる。
疎水性重合性単量体(A-2a)としては、酸性基を有さず重合性基を有するラジカル重合性単量体が好ましく、ラジカル重合が容易である観点から、重合性基は(メタ)アクリロイルオキシ基及び/又は(メタ)アクリルアミド基が好ましい。疎水性重合性単量体(A-2a)とは、酸性基を有さず、かつ25℃の水に対する溶解度が10質量%未満の重合性単量体を意味する。
疎水性重合性単量体(A-2a)としては、例えば、疎水性の単官能性重合性単量体に加え、芳香族化合物系の二官能性重合性単量体、脂肪族化合物系の二官能性重合性単量体、三官能性以上の重合性単量体などの架橋性重合性単量体が例示される。
本発明の歯科用組成物としては、重合性単量体(A)が酸性基を有しない親水性重合性単量体(A-2b)(以下、単に「親水性重合性単量体(A-2b)」と称することがある)を含むことが好ましい。親水性重合性単量体(A-2b)は、歯科用組成物の歯質への濡れ性を向上させる。
親水性重合性単量体(A-2b)としては、酸性基を有さず重合性基を有するラジカル重合性単量体が好ましく、ラジカル重合が容易である観点から、重合性基は(メタ)アクリロイルオキシ基及び/又は(メタ)アクリルアミド基が好ましい。親水性重合性単量体(A-2b)とは、酸性基を有さずかつ25℃の水に対する溶解度が10質量%以上のものを意味し、該溶解度が30質量%以上のものが好ましく、25℃において任意の割合で水に溶解可能なものがより好ましい。
親水性重合性単量体としては、水酸基、オキシメチレン基、オキシエチレン基、オキシプロピレン基、アミド基などの親水性基を有するものが好ましい。
親水性重合性単量体(A-2b)としては、例えば、2-ヒドロキシエチル(メタ)アクリレート、3-ヒドロキシプロピル(メタ)アクリレート、2-ヒドロキシプロピル(メタ)アクリレート、1,3-ジヒドロキシプロピル(メタ)アクリレート、2,3-ジヒドロキシプロピル(メタ)アクリレート、2-((メタ)アクリロイルオキシ)エチルトリメチルアンモニウムクロライド、ポリエチレングリコールジ(メタ)アクリレート(オキシエチレン基の数:9以上)などの親水性の単官能性(メタ)アクリレート系重合性単量体;N-メチロール(メタ)アクリルアミド、N-ヒドロキシエチル(メタ)アクリルアミド、N,N-ビス(2-ヒドロキシエチル)(メタ)アクリルアミド、N-メトキシメチル(メタ)アクリルアミド、N-エトキシメチル(メタ)アクリルアミド、ジアセトン(メタ)アクリルアミド、4-(メタ)アクリロイルモルホリン、N-トリヒドロキシメチル-N-メチル(メタ)アクリルアミド、N,N-ジメチルアクリルアミド及びN,N-ジエチルアクリルアミドなどの親水性の単官能性(メタ)アクリルアミド系重合性単量体などが挙げられる。
重合開始剤(B)は水溶性光重合開始剤(B-1)、非水溶性光重合開始剤(B-2)、及び化学重合開始剤(B-3)に分類される。重合開始剤(B)としては、水溶性光重合開始剤(B-1)のみを用いてもよく、非水溶性光重合開始剤(B-2)のみを用いてもよく、化学重合開始剤(B-3)のみを用いてもよく、水溶性光重合開始剤(B-1)と非水溶性光重合開始剤(B-2)と化学重合開始剤(B-3)とを併用してもよい。
水溶性光重合開始剤(B-1)は、親水的な歯面界面での重合硬化性が向上し、高い接着強さを実現できる。水溶性光重合開始剤(B-1)は、25℃の水に対する溶解度が10g/L以上であり、15g/L以上であることが好ましく、20g/L以上であることがより好ましく、25g/L以上であることがさらに好ましい。同溶解度が10g/L以上であることで、接着界面部において水溶性光重合開始剤(B-1)が歯質中の水に十分に溶解し、重合促進効果が発現しやすくなる。
A7において、接着性の観点から、pは1以上であり、2以上が好ましく、3以上がより好ましく、4以上がさらに好ましく、1000以下であり、100以下が好ましく、75以下がより好ましく、50以下がさらに好ましい。
本発明の歯科用組成物は、硬化性の観点から、水溶性光重合開始剤(B-1)以外に25℃の水への溶解度が10g/L未満である非水溶性光重合開始剤(B-2)(以下、非水溶性光重合開始剤(B-2)と称することがある。)を含むことが好ましい。本発明に用いられる非水溶性光重合開始剤(B-2)は、公知の光重合開始剤を使用することができる。非水溶性光重合開始剤(B-2)は、1種を単独で配合してもよく、2種以上を組み合わせて配合してもよい。
本発明の歯科用組成物は、化学重合開始剤(B-3)を含有することができ、有機過酸化物が好ましく用いられる。上記の化学重合開始剤に使用される有機過酸化物は特に限定されず、公知のものを使用することができる。代表的な有機過酸化物としては、例えば、ケトンペルオキシド、ヒドロペルオキシド、ジアシルペルオキシド、ジアルキルペルオキシド、ペルオキシケタール、ペルオキシエステル、ペルオキシジカーボネートなどが挙げられる。これら有機過酸化物の具体例としては、国際公開第2008/087977号に記載のものが挙げられる。化学重合開始剤(B-3)は、1種を単独で配合してもよく、2種以上を組み合わせて配合してもよい。
本発明の歯科用組成物は、ハンドリング性を調整するために、また硬化物の機械的強度を高めるために、フィラー(C)を含む。
フィラー(C)としては、後述の歯科用表面処理フィラー(C-1);無機フィラー、有機フィラー、及び有機-無機複合フィラー等の歯科用表面処理フィラー(C-1)以外のフィラーが挙げられる。フィラー(C)は、1種を単独で配合してもよく、2種以上を組み合わせて配合してもよい。
ある実施形態としては、重合性単量体(A)、重合開始剤(B)、及びフィラー(C)を含み、前記フィラー(C)が、重合性基を有するシランカップリング剤(a)、及びエンドキャッピング剤(b)によって表面処理された歯科用表面処理フィラー(C-1)及び歯科用表面処理フィラー(C-1)以外のフィラーを含み、かつ前記歯科用表面処理フィラー(C-1)の耐酸性試験における金属成分の溶出量が100ppm未満である、歯科用組成物が挙げられる。
まず、歯科用表面処理フィラー(C-1)以外のフィラーについて、説明する。
凝集フィラーは1種を単独で用いてもよく、2種以上を併用してもよい。
凝集フィラーは、金属酸化物の一次粒子が凝集したものが好ましい。
金属酸化物は複合酸化物であってもよい。複合酸化物としては、例えば、シリカ-ジルコニア、シリカ-チタニア等が挙げられる。
金属酸化物としては、得られる歯科用組成物の研磨容易性などの観点から、シリカ-ジルコニア酸化物が好ましい。
得られる歯科用組成物のハンドリング性、及び機械的強度などの観点から、凝集フィラーの2次粒子の平均粒子径は1~20μmであり、1.5~15μmが好ましく、2~12.5μmであることがより好ましく、3~10μmであることがさらに好ましい。
また、凝集フィラーの1次粒子の平均粒子径は、得られる歯科用組成物の研磨容易性などの観点から、30~500nmが好ましく、40~400nmがより好ましく、50~300nmがさらに好ましく、60~200nmであることが特に好ましい。
凝集フィラーは、市販品を使用してもよい。
市販品としては、例えば、シリカ-ジルコニア酸化物凝集フィラーである「SG-SZ200G151CMP8」、「SG-SZ50G151CMP8」、「SG-SZ200G154CMP8」(Sukgyung AT社製)が挙げられる。
本発明の歯科用組成物はフィラー(C)として、重合性基を有するシランカップリング剤(a)(以下、単に「シランカップリング剤(a)」と称することがある)、及びエンドキャッピング剤(b)によって表面処理された歯科用表面処理フィラー(C-1)(以下、単に「歯科用表面処理フィラー(C-1)」と称することがある)を含む。歯科用組成物が歯科用表面処理フィラー(C-1)を含有することにより、過酷な条件(例えば、60℃4週間等)においても保存安定性に優れ、かつその硬化物が十分な機械的強度を有する歯科用組成物を得ることができる。歯科用表面処理フィラー(C-1)の耐酸性試験における金属成分の溶出量は、100ppm未満である。前記金属成分の溶出量は、95ppm以下が好ましく、90ppm以下がより好ましく、70ppm以下がさらに好ましく、50ppm以下が特に好ましい。耐酸性試験における金属成分の溶出量の測定方法は、後記する実施例に記載のとおりである。
歯科用表面処理フィラー(C-1)は、フィラーの表面に、シランカップリング剤(a)に由来する構造と、エンドキャッピング剤(b)に由来する構造を有するものが好ましい。さらに、歯科用表面処理フィラー(C-1)は、シランカップリング剤(a)に由来する構造がフィラーの表面と化学的に結合しているものが好ましい。また、歯科用表面処理フィラー(C-1)は、エンドキャッピング剤(b)に由来する構造がフィラーの表面と化学的に結合しているものが好ましい。またさらに、歯科用表面処理フィラー(C-1)は、シランカップリング剤(a)に由来する構造とエンドキャッピング剤(b)に由来する構造が互いに化学的に結合している構造を有することが好ましい。
歯科用表面処理フィラー(C-1)は、重合性基を有するシランカップリング剤(a)でも表面処理されている。シランカップリング剤(a)としては、特に制限はなく公知のシランカップリング剤を用いることができるが、一般式(6)で示されるシランカップリング剤が好ましく用いられる。
Y-SiRpX(3-p) (6)
(式中、Yは重合性基、又は重合性基を有する1価の有機基を表し、Rはアルキル基、アリール基及びアラルキル基からなる群より選ばれる基を表し、Xは水酸基又は加水分解性基を表し、pは0、1又は2の整数を表す。ただし、複数存在するRは互いに同一であっても異なっていてもよく、複数存在するXは互いに同一であっても異なっていてもよい。)
炭素数3~11のアルキル基としては、例えば、n-プロピル基、イソプロピル基、n-ブチル基、n-ペンチル基、n-オクチル基、n-ウンデシル基などが挙げられ、n-プロピル基、n-ペンチル基、n-オクチル基、n-ウンデシル基が好ましく、n-プロピル基、n-オクチル基、n-ウンデシル基がより好ましい。
また、シランカップリング剤(a)はこれらが加水分解及び/又は縮合したものであってもよい。シランカップリング剤(a)は、1種を単独で使用してもよいし、2種以上を併用してもよい。これらの中でも、機械的強度等の観点から、3-メタクリロイルオキシプロピルトリメトキシシラン、8-(メタ)アクリロイルオキシオクチルトリメトキシシラン、11-(メタ)アクリロイルオキシウンデシルトリメトキシシラン及び、これらの加水分解物が好ましい。
歯科用表面処理フィラー(C-1)は、シランカップリング剤(a)に加えて、エンドキャッピング剤(b)で表面処理されている。エンドキャッピング剤(b)としては、下記一般式(1)、又は(2)で示される構造を有し、かつ沸点が180℃以下である化合物が好ましい。
好ましい無機フィラーの素材は具体的には、各種ガラス類〔シリカを主成分とし、必要に応じ、重金属、ホウ素、アルミニウム等の酸化物を含有する。例えば、溶融シリカ、石英、ソーダライムシリカガラス、Eガラス、Cガラス、ボロシリケートガラス(パイレックス(登録商標)ガラス)等の一般的な組成のガラス粉末、バリウムガラス(GM27884、8235、SCHOTT社製、E-2000、E-3000、ESSTECH社製)、ストロンチウムボロシリケートガラス(E-4000、ESSTECH社製)、ランタンガラスセラミックス(GM31684、SCHOTT社製)、フルオロアルミノシリケートガラス(GM35429、G018-091、G018-117、SCHOTT社製)等の歯科用ガラス粉末〕、シリカ-チタニア、シリカ-ジルコニア等の複合酸化物、シリカ-ジルコニア酸化物凝集フィラー、フッ化イッテルビウム、シリカで表面をコートされたコアシェル構造のフッ化イッテルビウム、シリカで表面をコートされたコアシェル構造のフッ化イットリウム、硫酸バリウム、二酸化ジルコニウム、シリカで表面をコートされたコアシェル構造の硫酸バリウム、シリカで表面をコートされたコアシェル構造の二酸化ジルコニウム等が挙げられ、これらの中でも、X線不透過性を有するという観点から、バリウムガラス、ランタンガラスセラミックス、フルオロアルミノシリケートガラス、シリカ-チタニア、シリカ-ジルコニア等の複合酸化物、フッ化イッテルビウム、シリカで表面をコートされたコアシェル構造のフッ化イッテルビウム、シリカで表面をコートされたコアシェル構造のフッ化イットリウム、硫酸バリウム、二酸化ジルコニウム、シリカで表面をコートされたコアシェル構造の硫酸バリウム、シリカで表面をコートされたコアシェル構造の二酸化ジルコニウム等のX線不透過性フィラーが好ましい。
なお、「X線不透過性」は、X線が透過できない物質の性質を表し、X線写真においてX線不透過な領域は白く見える。本明細書において、「X線不透過性」とは従来の方法で標準的な歯科用X線装置を使用して、天然歯質と硬化した歯科用組成物とを区別するための能力を表す。歯科用組成物中にX線不透過性フィラーが含まれると、歯科用組成物はX線不透過性を示すことから、X線を使用して歯の状態を診断する場合においてX線不透過性フィラーを含まない歯科用組成物より好適に用いられる。
さらに機械的強度等の観点から、バリウムガラス、ストロンチウムボロシリケートガラス、ランタンガラスセラミックス、フルオロアルミノシリケートガラス、シリカ-ジルコニア等の複合酸化物、シリカで表面をコートされたコアシェル構造のフッ化イッテルビウム、シリカ-ジルコニア酸化物凝集フィラーが好ましく、バリウムガラス、ストロンチウムボロシリケートガラス、ランタンガラスセラミックス、フルオロアルミノシリケートガラス、シリカで表面をコートされたコアシェル構造のフッ化イッテルビウム、シリカ-ジルコニア酸化物凝集フィラーがより好ましい。これらは、1種を単独で用いてもよく、2種以上を併用してもよい。
ある実施形態としては、重合性基を有するシランカップリング剤(a)によって表面処理された後に、エンドキャッピング剤(b)によって表面処理されてなる、歯科用表面処理フィラー(C-1)が挙げられる。
他の実施形態としては、重合性基を有するシランカップリング剤(a)によって表面処理された後に、加水分解されてなる、歯科用表面処理フィラー(C-1)が挙げられる。
他の実施形態としては、フィラー(C)が、歯科用表面処理フィラー(C-1)と、歯科用表面処理フィラー(C-1)以外のフィラーを含むものであってもよい。歯科用表面処理フィラー(C-1)以外のフィラーは、1種を単独で用いてもよく、2種以上を併用してもよい。前記実施形態においては、歯科用表面処理フィラー(C-1)と歯科用表面処理フィラー(C-1)以外のフィラーの質量比は、10:1~1:10が好ましく、8:1~1:8がより好ましく、1:5~5:1がさらに好ましい。フィラー(C)の含有量は特に限定されないが、後述の通り歯科用組成物の用途によって好ましい含有量は異なる。
本発明の歯科用組成物は、重合開始剤(B)とともに重合促進剤(D)を用いることができる。本発明に用いられる重合促進剤(D)としては、例えば、アミン類、スルフィン酸及びその塩、ボレート化合物、バルビツール酸化合物、トリアジン化合物、銅化合物、スズ化合物、バナジウム化合物、ハロゲン化合物、アルデヒド類、チオール化合物、亜硫酸塩、亜硫酸水素塩、チオ尿素化合物などが挙げられる。
脂肪族アミンとしては、例えば、n-ブチルアミン、n-ヘキシルアミン、n-オクチルアミンなどの第1級脂肪族アミン;ジイソプロピルアミン、ジブチルアミン、N-メチルエタノールアミンなどの第2級脂肪族アミン;N-メチルジエタノールアミン、N-エチルジエタノールアミン、N-n-ブチルジエタノールアミン、N-ラウリルジエタノールアミン、2-(ジメチルアミノ)エチルメタクリレート、N-メチルジエタノールアミンジメタクリレート、N-エチルジエタノールアミンジメタクリレート、トリエタノールアミンモノメタクリレート、トリエタノールアミンジメタクリレート、トリエタノールアミントリメタクリレート、トリエタノールアミン、トリメチルアミン、トリエチルアミン、トリブチルアミンなどの第3級脂肪族アミンなどが挙げられる。これらの中でも、歯科用組成物の硬化性及び保存安定性の観点から、第3級脂肪族アミンが好ましく、その中でもN-メチルジエタノールアミン及びトリエタノールアミンがより好ましく用いられる。
本発明に用いられる重合促進剤(D)の含有量は特に限定されないが、得られる歯科用組成物の硬化性などの観点からは、歯科用組成物における重合性単量体(A)100質量部に対して、0.001~30質量部が好ましく、0.01~10質量部がより好ましく、0.05~20質量部がさらに好ましく、0.1~5質量部が特に好ましい。
重合促進剤(D)の含有量が0.001質量部以上である場合、重合が十分に進行し、所望の接着性が得られ、より好適には0.05質量部以上である。
一方、重合促進剤(D)の含有量が30質量部以下である場合、十分な接着性が得られるため、より好適には20質量部以下である。
本発明の歯科用組成物は、さらにフッ素イオン放出性物質を含有してもよい。フッ素イオン放出性物質を含有することによって、歯質に耐酸性を付与することができる歯科用組成物が得られる。かかるフッ素イオン放出性物質としては、例えば、フッ化ナトリウム、フッ化カリウム、モノフルオロリン酸ナトリウム、フッ化リチウム、フッ化イッテルビウムなどの金属フッ化物類などが挙げられる。上記フッ素イオン放出性物質は1種単独を含有してもよく、2種以上を組み合わせて含有してもよい。
ある実施形態において、本発明の歯科用組成物は、溶媒を含んでもよい。溶媒としては、水、有機溶媒等が挙げられる。溶媒は水と有機溶媒との混合溶媒の形態で用いられることが好ましい。また、実施形態によっては前記有機溶媒の含有を必要としない場合もある。
水は、接着性に悪影響を及ぼす不純物を実質的に含有しないものを使用する必要があり、蒸留水又はイオン交換水が好ましい。水の含有量が過少な場合、脱灰作用促進効果が十分に得られないおそれがあり、過多な場合は接着性が低下することがある。溶媒のうち、水の含有量は、歯科用組成物の重合性単量体(A)100質量部に対して、1~500質量部が好ましく、5~300質量部がより好ましく、10~200質量部がさらに好ましい。
本発明の歯科用組成物の好適な実施形態の一つとして、自己接着性歯科用コンポジットレジンが挙げられる。
本発明の歯科用組成物を自己接着性歯科用コンポジットレジンとして用いる場合、重合性単量体(A)、重合開始剤(B)、歯科用表面処理フィラー(C-1)、及び重合促進剤(D)を含み、重合性単量体(A)が酸性基を有する重合性単量体(A-1)、酸性基を有しない疎水性重合性単量体(A-2a)、及び酸性基を有しない親水性重合性単量体(A-2b)を含むことが好ましい。また、重合開始剤(B)は光重合開始剤を含むことが好ましく、重合開始剤(B)が水溶性光重合開始剤(B-1)と非水溶性光重合開始剤(B-2)を含むことがより好ましい。本発明の歯科用組成物を自己接着性歯科用コンポジットレジンとして用いる場合、前処理材を使用してもよいが、自己接着性を有するため前処理材は必須ではなく、前処理材を使用しなくてもよい。前処理材を含まず、本発明の歯科用組成物のみからなる自己接着性歯科用コンポジットレジンとすることができる。
本発明の歯科用組成物の他の好適な実施形態の一つとして、歯科用セメントが挙げられる。歯科用セメントとしては、レジンセメント、グラスアイオノマーセメント、レジン強化型グラスアイオノマーセメントなどが好適なものとして例示される。
なお、歯科用セメントを使用する際は、セルフエッチングプライマーなどを前処理材として先に使用してもよい。本発明の歯科用組成物を歯科用セメントとして用いる場合、重合性単量体(A)、重合開始剤(B)、歯科用表面処理フィラー(C-1)及び重合促進剤(D)を含み、重合性単量体(A)が酸性基を有する重合性単量体(A-1)、酸性基を有しない疎水性重合性単量体(A-2a)、酸性基を有しない親水性重合性単量体(A-2b)を含むことが好ましい。また、重合開始剤(B)は化学重合開始剤を含むことが好ましく、化学重合開始剤と光重合開始剤とを併用することがより好ましい。光重合開始剤は水溶性光重合開始剤(B-1)と非水溶性光重合開始剤(B-2)を併用することが好ましい。
本発明の歯科用組成物の好適な実施形態の一つとして、歯科用ボンディング材が挙げられる。該歯科用ボンディング材は、脱灰工程、浸透工程、及び硬化工程を併せて一段階で行うことが可能なものである。
歯科用ボンディング材としては、A液及びB液に分けられた2液を使用直前に混和して用いる2ボトル型、1液をそのまま使用することのできる1ボトル型が挙げられる。中でも、1ボトル型の方がより工程が簡素化されるため、使用上のメリットは大きい。歯科用ボンディング材は、セルフエッチングプライマーなどを前処理材として用いてもよい。本歯科用ボンディング材に用いる歯科用組成物としては、重合性単量体(A)、重合開始剤(B)、歯科用表面処理フィラー(C-1)及び重合促進剤(D)を含み、重合性単量体(A)が酸性基を有する重合性単量体(A-1)、酸性基を有しない疎水性重合性単量体(A-2a)、酸性基を有しない親水性重合性単量体(A-2b)、及び溶媒を含むことが好ましい。
また、重合開始剤(B)は光重合開始剤を含むことが好ましく、重合開始剤(B)が水溶性光重合開始剤(B-1)と非水溶性光重合開始剤(B-2)を含むことがより好ましい。
本発明の歯科用組成物の好適な実施形態の一つとして、歯科用コンポジットレジン(自己接着性歯科用コンポジットレジンを除く)が挙げられる。本発明の歯科用組成物を歯科用コンポジットレジンとして用いる場合、重合性単量体(A)、重合開始剤(B)、歯科用表面処理フィラー(C-1)、及び重合促進剤(D)を含む。また、重合開始剤(B)は光重合開始剤を含むことが好ましく、重合開始剤(B)が水溶性光重合開始剤(B-1)と非水溶性光重合開始剤(B-2)を含むことがより好ましい。
本発明の歯科用組成物の他の好適な実施形態の一つとして、歯科用支台築造材料が挙げられる。歯科用支台築造材料としては、レジンセメントが好適なものとして例示される。歯科用支台築造材料は、セルフエッチングプライマーなどを前処理材として用いてもよい。本発明の歯科用組成物を歯科用支台築造材料として用いる場合、重合性単量体(A)、重合開始剤(B)、歯科用表面処理フィラー(C-1)及び重合促進剤(D)を含み、重合性単量体(A)が酸性基を有する重合性単量体(A-1)、酸性基を有しない疎水性重合性単量体(A-2a)、酸性基を有しない親水性重合性単量体(A-2b)を含むことが好ましい。また、重合開始剤(B)は化学重合開始剤を含むことが好ましく、化学重合開始剤と光重合開始剤とを併用することがより好ましい。光重合開始剤は水溶性光重合開始剤(B-1)と非水溶性光重合開始剤(B-2)を併用することが好ましい。
MDP:10-メタクリロイルオキシデシルジハイドロジェンホスフェート
D-2.6E:2,2-ビス(4-メタクリロイルオキシポリエトキシフェニル)プロパン(エトキシ基の平均付加モル数:2.6)
3G:トリエチレングリコールジメタクリレート
MAEA:N-メタクリロイルオキシエチルアクリルアミド
・水溶性光重合開始剤(B-1)
Li-TPO:フェニル(2,4,6-トリメチルベンゾイル)ホスフィン酸リチウム
・非水溶性光重合開始剤(B-2)
CQ:カンファーキノン
製造例1:フィラー1の製造
・塩酸処理工程
8235 UF0.7グレード(SCHOTT社製のバリウムガラス、平均粒子径:0.7μm)100g、5質量%塩酸水溶液500mLをビーカーに加え、室温で30分撹拌し、減圧濾過にて塩酸水溶液を取り除いた。次いで、500mLの蒸留水とフィラー(酸処理物)を再度ビーカーに加え、室温で30分撹拌し、減圧濾過にて水溶液を取り除く洗浄工程を3回繰り返し、真空乾燥を行った。
・シランカップリング剤(a)による表面処理工程
前記塩酸処理を行ったフィラー100g、3-メタクリロイルオキシプロピルトリメトキシシラン10g、及び0.3質量%酢酸水溶液200mLを三口フラスコに入れ、2時間、室温下で撹拌した。凍結乾燥により水を除去した後、80℃で5時間加熱処理を行った。次いで、エタノール500mLとフィラー(前記シランカップリング剤(a)による表面処理を行ったフィラー)100gをビーカーに加え、室温で30分撹拌し、減圧濾過にて溶液を取り除く洗浄工程を3回繰り返し、真空乾燥を行った。
・加水分解処理工程
前記シランカップリング剤(a)による表面処理を行ったフィラー100gと、5質量%酢酸溶液(5gの酢酸、100mLの水/エタノールの混合溶液(50:50(v/v)))をビーカーに加え、室温で30分撹拌した後、減圧濾過にて溶媒を取り除いた。次いで、別途用意した500mLの水/エタノールの混合溶液(50:50(v/v))とフィラー(加水分解処理を経たフィラー)をビーカーに加え、室温で30分撹拌し、減圧濾過にて溶媒を取り除く洗浄工程を3回繰り返し、真空乾燥を行った。
・エンドキャッピング剤(b)による表面処理工程
前記加水分解処理を行ったフィラー100g、ヘキサメチルシクロトリシロキサン1gを耐圧容器に加え、140℃で24時間反応させた。次いで、エタノール500mLとエンドキャッピング剤(b)ヘキサメチルシクロトリシロキサンによる表面処理工程後のフィラー100gをビーカーに加えて、室温で30分撹拌し、減圧濾過にて溶媒を取り除く洗浄工程を3回繰り返し、真空乾燥を行い、フィラー1を得た。
製造例2:フィラー2の製造
原料が8235 UF0.7グレードからGM27884 NF180グレード(SCHOTT社製のバリウムガラス、平均粒子径:0.18μm)に変更された以外は製造例1と同じ方法でフィラー2を製造した。
製造例3:フィラー3の製造
バリウムガラス(ESSTECH社製、商品コード「E-3000」)をボールミルで粉砕し、バリウムガラス粉を得た。得られたバリウムガラス粉の平均粒子径をレーザー回折式粒子径分布測定装置(株式会社島津製作所製、型式「SALD-2300」)を用いて体積基準で測定したところ、2.4μmであった。本フィラーを8235 UF0.7グレードの代わりに原料として使用した以外は製造例1と同じ方法でフィラー3を製造した。
製造例4:フィラー4の製造
珪石粉(株式会社ニッチツ製、石英、商品名:ハイシリカ)をボールミルで粉砕し、粉砕珪石粉を得た。得られた粉砕珪石粉の平均粒子径をレーザー回折式粒子径分布測定装置(株式会社島津製作所製、型式「SALD-2300」)を用いて体積基準で測定したところ、2.2μmであった。本フィラーを8235 UF0.7グレードの代わりに原料として使用した以外は製造例1と同じ方法でフィラー4を製造した。
製造例5:フィラー5の製造
加水分解処理工程を省略する以外は、製造例1と同じ原料、方法でフィラー5を製造した。
製造例6:フィラー6の製造
塩酸処理工程を省略する以外は、製造例1と同じ原料、方法でフィラー6を製造した。
製造例7:フィラー7の製造
塩酸処理工程後、製造例1におけるエンドキャッピング剤(b)による表面処理工程、シランカップリング剤(a)による表面処理工程の順で8235 UF0.7グレードを用いてフィラー7を製造した。
製造例8:フィラー8の製造
表面処理シリカ-ジルコニア酸化物凝集フィラー(商品名「SG-SZ200G151CMP8」、1次粒子の平均粒子径:200nm、2次粒子の平均粒子径:5.2μm、屈折率:1.51、構成成分:SiO2、ZrO2、Sukgyung AT社製)を製造例1と同じ方法で加水分解処理工程、エンドキャッピング剤(b)による表面処理工程を行うことでフィラー8を製造した。
製造例9:フィラー9の製造
シランカップリング剤(a)による表面処理工程、加水分解処理工程を省略する以外は製造例1と同じ原料、方法でフィラー9を製造した。
製造例10:フィラー10の製造
8235 UF0.7グレードを製造例1のシランカップリング剤(a)による表面処理工程のみで処理することでフィラー10を製造した。
製造例11:フィラー11の製造
8235 UF0.7グレードを製造例1の塩酸処理工程、及びシランカップリング剤(a)による表面処理工程のみで処理することでフィラー11を製造した。
製造例12:フィラー12の製造
GM27884 NF180グレードを製造例1の塩酸処理工程、及びシランカップリング剤(a)による表面処理工程のみで処理することでフィラー12を製造した。
製造例13:フィラー13の製造
8235 UF0.7グレードを製造例1の塩酸処理工程、及びシランカップリング剤(a)による表面処理工程、加水分解処理工程を行った後、以下の工程で処理を行ってフィラー13を製造した。
・ジメチルジメトキシシランによる表面処理工程
上記工程で得られたフィラー100g、ジメチルジメトキシシラン5g、及び0.3質量%酢酸エタノール溶液200mLを三口フラスコに入れ、2時間、室温下で撹拌した。減圧留去により溶媒を除去した後、真空乾燥を行い、80℃で5時間加熱処理を行った。次いで、エタノール500mLとフィラー(ジメチルジメトキシシランによる表面処理を行ったフィラー)100gをビーカーに加え、室温で30分撹拌し、減圧濾過にて溶液を取り除く洗浄工程を3回繰り返し、真空乾燥を行った。
製造例14:フィラー14の製造
8235 UF0.7グレードを製造例1の塩酸処理工程、及びシランカップリング剤(a)による表面処理工程、加水分解処理工程を行った後、以下の工程で処理を行ってフィラー14を製造した。
・1,1,1,3,3,3-ヘキサメチルジシラザンによる表面処理工程
上記工程で得られたフィラー100g、イソプロパノール200mL、1,1,1,3,3,3-ヘキサメチルジシラザン4gを三口フラスコに加え、40℃で72時間反応した。表面処理後に得られた混合物全量に35%塩酸水溶液を5g加え、フィラー(1,1,1,3,3,3-ヘキサメチルジシラザンによる表面処理を行ったフィラー)を沈殿させた。沈殿物をろ紙で濾過した。次いで、500mLの蒸留水と沈殿物を再度ビーカーに加え、室温で30分撹拌し、減圧濾過にて水溶液を取り除く洗浄工程を3回繰り返し、100℃で真空乾燥を行い、フィラー14を製造した。
製造例15:フィラー15の製造
OX50(日本アエロジル株式会社製、超微粒子シリカ「アエロジル(登録商標)OX50」、平均粒子径:0.04μm)100g、3-メタクリロイルオキシプロピルトリメトキシシラン7g、及び0.3質量%酢酸水溶液200mLを三口フラスコに入れ、2時間、室温下で撹拌した。凍結乾燥により水を除去した後、80℃で5時間加熱処理を行い、フィラー15(シラン処理シリカ)を得た。
DABE:4-(N,N-ジメチルアミノ)安息香酸エチル
BHT:3,5-ジ-t-ブチル-4-ヒドロキシトルエン
表1~2に示す原料を常温(23℃)暗所で混合、及び混練してペースト状の歯科用組成物(歯科用コンポジットレジン)を調製し、以下の試験例1、2の方法に従って特性を調べた。また各製造例に従って製造したフィラーに関し、試験例3の方法に従って特性を調べた。結果を表1~2に示す。製造例9によって得られた表面処理フィラー(フィラー9)の表面の構造を図1に示す。製造例1によって得られた歯科用表面処理フィラー(C-1)(フィラー1)の表面の構造を図2に示す。
ISO 4049:2009に準拠して曲げ試験により曲げ強さを評価した。具体的には以下のとおりである。作製したペースト(歯科用組成物)をSUS製の金型(縦2mm×横25mm×厚さ2mm)に充填し、ペーストの上下(2mm×25mmの面)をスライドガラスで圧接した。次いで、歯科用可視光照射器「ペンキュアー2000」(株式会社モリタ製)で、スライドガラス越しに10秒間ずつ片面5箇所でペーストの裏表に光照射してペーストを硬化させた。得られた硬化物について、万能試験機(オートグラフAG-I 100kN、株式会社島津製作所製)を用いて、支点間距離20mm、クロスヘッドスピード1mm/minで曲げ試験を実施し、3点曲げ強さを測定し(n=5)、平均値を算出した。
ウシ下顎前歯の唇面を流水下にて#80のシリコンカーバイド紙(日本研紙株式会社製)で研磨して、象牙質の平坦面を露出させたウシ下顎前歯を得た。15穴のモールド(15-hole mold、ウルトラデント社製、φ35mm×高さ25mm)の底面にテープを貼り、その上に上述の通り準備した歯を固定した。石膏をモールド内に充填し、約30分静置し、石膏を硬化させて、ウシ下顎前歯と石膏の複合物を得た。モールドから、該複合物をサンプルとして取り出した。
前記サンプルは、ウシ下顎前歯が石膏の上部表面に出ている状態のものとした。ウシ下顎前歯が上部表面に出ている面を流水下にて#600のシリコンカーバイド紙(日本研紙株式会社製)で被着面が確保できる大きさ(φ2.38mm以上)まで研磨し、超音波で5分間水洗した。
接着強さ(剪断接着強さ)の測定は、接着試験供試サンプルを専用ホルダー(Test Base Clamp、ウルトラデント社製)に取り付け、専用冶具(Crosshead Assembly、ウルトラデント社製)と万能試験機(株式会社島津製作所製)を用い、クロスヘッドスピードを1mm/分に設定して測定し(n=10)、平均値を算出した。
また、各実施例及び比較例で作製した直後の歯科用組成物を用いる代わりに、各実施例及び比較例で作製し60℃下で4週間保管した歯科用組成物を用いた以外は、上記と同様にして、牛歯象牙質に対するせん断接着試験を行った。
表1及び2において、ペースト状の歯科用組成物の作製直後に接着試験供試サンプルを作製し、剪断接着強さを測定したものを「初期品」とし、ペースト状の歯科用組成物を作製して60℃下で4週間保管した後に、接着試験供試サンプルを作製し、剪断接着強さを測定したものを「60℃4週品」とした。
フィラー1~14の各々につき、フィラー0.5gを5%酢酸水溶液に添加し、5分間超音波分散(ブランソン卓上超音波洗浄器 Bransonic(登録商標)M2800-J、110W、ヤマト科学株式会社製)を行い、6時間室温で静置した。次いで、フィラーを除去するために、遠心分離機(20,000rpm、30分、himac CR21GII、エッペンドルフ・ハイマック・テクノロジーズ株式会社製)にてフィラーを沈降させ、時間をあけず速やかに上澄み液を回収した。不純物を除去するために上澄み液をメンブレンフィルター(孔径:0.45μm)にかけた後、ICP発光分光分析装置(RFパワー:1150W、補助ガス流量:0.5L/min、ネブライザーガス流量:0.7L/min、分析ポンプ流量:50rpm、プラズマビュー:アキシャル、低波長範囲:15sec、高波長範囲:10sec、サーモフィッシャーサイエンティフィック iCAP6500Duo、サーモフィッシャーサイエンティフィック株式会社製)にて元素分析を実施し(n=3)、測定された金属元素量の平均値を算出した(単位:質量ppm)。結果を表1及び2に示す。なお、フィラー15については耐酸性の評価対象外としたため、表2における歯科用表面処理フィラー(C-1)以外のフィラー(C)の耐酸性試験は、フィラー9~14の耐酸性試験の結果を表す。本耐酸性試験において検出される金属元素量が少ないほど、酸性成分とフィラーとの相互作用が阻害されていると考えられることから、フィラーの表面が有機分子でより緻密に覆われていることが示唆される。
一方、表2に示されるように、比較例の歯科用組成物の中で、歯科用表面処理フィラー(C-1)が含まれていない、比較例1-1~1-6において、比較例1-1は曲げ強さが60MPaと不十分であり、比較例1-2~1-6においては、60℃4週保管後の牛歯象牙質に対する接着強さが1MPa以下であり、過酷な条件における保存安定性が低いことが確認された。
比較例1-3に用いたフィラー11及び比較例1-4に用いたフィラー12は、塩酸で処理をし、シランカップリング剤(a)で表面処理をしており、特許文献3(特開2011-178778号公報)に相当する。
また、比較例1-6に用いたフィラー14は、特許文献4(国際公開第2018/074594号)に相当する。さらに耐酸性試験において、実施例の歯科用表面処理フィラー(C-1)は耐酸性が93ppm未満と優れているのに対し、比較例1-2~1-6の歯科用表面処理フィラー(C-1)以外のフィラーは300ppm以上と金属成分の溶出量が多く確認された。
この耐酸性試験の結果と牛歯象牙質に対するせん断接着試験は相関があることから、本発明の歯科用表面処理フィラー(C-1)は表面が有機分子でより緻密に覆われており、そのため酸性基を有する重合性単量体とフィラーとの相互作用が阻害されていることで、過酷な条件においても保存安定性に優れる歯科用組成物が得られたものと考えられる。
Claims (22)
- 重合性単量体(A)、重合開始剤(B)、及びフィラー(C)を含み、
前記フィラー(C)が、重合性基を有するシランカップリング剤(a)、及びエンドキャッピング剤(b)によって表面処理された歯科用表面処理フィラー(C-1)を含み、かつ
前記歯科用表面処理フィラー(C-1)の耐酸性試験における金属成分の溶出量が100ppm未満である、歯科用組成物。 - 前記歯科用表面処理フィラー(C-1)が、前記重合性基を有するシランカップリング剤(a)によって表面処理された後に、前記エンドキャッピング剤(b)によって表面処理されてなる、請求項1又は2に記載の歯科用組成物。
- 前記歯科用表面処理フィラー(C-1)が、前記重合性基を有するシランカップリング剤(a)によって表面処理された後に、加水分解されてなる、請求項1~3のいずれか1項に記載の歯科用組成物。
- 前記歯科用表面処理フィラー(C-1)がX線不透過性フィラーを含む、請求項1~4のいずれか1項に記載の歯科用組成物。
- 前記X線不透過性フィラーが酸処理されてなる、請求項5に記載の歯科用組成物。
- 前記重合性基を有するシランカップリング剤(a)が3-メタクリロイルオキシプロピルトリメトキシシラン、8-(メタ)アクリロイルオキシオクチルトリメトキシシラン、11-(メタ)アクリロイルオキシウンデシルトリメトキシシラン及び、これらの加水分解物を含む、請求項1~6のいずれか1項に記載の歯科用組成物。
- 前記エンドキャッピング剤(b)がヘキサメチルシクロトリシロキサンである、請求項1~7のいずれか1項に記載の歯科用組成物。
- 前記歯科用表面処理フィラー(C-1)を得るための表面処理におけるフィラーに対する前記エンドキャッピング剤(b)による処理量が、表面処理前のフィラー100質量部に対して、0.01~20質量部である、請求項1~8のいずれか1項に記載の歯科用組成物。
- 前記重合性単量体(A)が、酸性基を有する重合性単量体(A-1)、及び酸性基を有しない重合性単量体(A-2)を含む、請求項1~9のいずれか1項に記載の歯科用組成物。
- 前記酸性基を有する重合性単量体(A-1)の含有量が、重合性単量体(A)100質量部中、1~40質量部である、請求項10に記載の歯科用組成物。
- 請求項1~11のいずれか1項に記載の歯科用組成物からなる、自己接着性歯科用コンポジットレジン。
- 請求項1~11のいずれか1項に記載の歯科用組成物からなる、歯科用ボンディング材。
- 請求項1~11のいずれか1項に記載の歯科用組成物からなる、歯科用セメント。
- 請求項1~11のいずれか1項に記載の歯科用組成物からなる、歯科用コンポジットレジン。
- 請求項1~11のいずれか1項に記載の歯科用組成物からなる、歯科用支台築造材料。
- 前記歯科用表面処理フィラー(C-1)を得る工程を備え、
前記工程が、重合性基を有するシランカップリング剤(a)によってフィラーを表面処理する工程、エンドキャッピング剤(b)によって前記フィラーを表面処理する工程を含む、請求項1~11のいずれか1項に記載の歯科用組成物の製造方法。 - 前記フィラーが、無機フィラーを含む、請求項18に記載の歯科用表面処理フィラー(C-1)。
- 前記無機フィラーが、凝集フィラーを含む、請求項19に記載の歯科用表面処理フィラー(C-1)。
- 前記重合性基を有するシランカップリング剤(a)によって表面処理された後に、前記エンドキャッピング剤(b)によって表面処理されてなる、請求項18~20のいずれか1項に記載の歯科用表面処理フィラー(C-1)。
- 前記重合性基を有するシランカップリング剤(a)によって表面処理された後に、加水分解されてなる、請求項18~21のいずれか1項に記載の歯科用表面処理フィラー(C-1)。
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