WO2022138973A1 - 歯科用組成物 - Google Patents
歯科用組成物 Download PDFInfo
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- WO2022138973A1 WO2022138973A1 PCT/JP2021/048424 JP2021048424W WO2022138973A1 WO 2022138973 A1 WO2022138973 A1 WO 2022138973A1 JP 2021048424 W JP2021048424 W JP 2021048424W WO 2022138973 A1 WO2022138973 A1 WO 2022138973A1
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Images
Classifications
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- 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
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- A61C5/20—Repairing attrition damage, e.g. facets
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F222/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a carboxyl radical and containing at least one other carboxyl radical in the molecule; Salts, anhydrides, esters, amides, imides, or nitriles thereof
- C08F222/10—Esters
- C08F222/1006—Esters of polyhydric alcohols or polyhydric phenols
- C08F222/102—Esters of polyhydric alcohols or polyhydric phenols of dialcohols, e.g. ethylene glycol di(meth)acrylate or 1,4-butanediol dimethacrylate
- C08F222/1025—Esters of polyhydric alcohols or polyhydric phenols of dialcohols, e.g. ethylene glycol di(meth)acrylate or 1,4-butanediol dimethacrylate of aromatic dialcohols
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L35/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a carboxyl radical, and containing at least one other carboxyl radical in the molecule, or of salts, anhydrides, esters, amides, imides or nitriles thereof; Compositions of derivatives of such polymers
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- A—HUMAN NECESSITIES
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F2800/00—Copolymer characterised by the proportions of the comonomers expressed
- C08F2800/20—Copolymer characterised by the proportions of the comonomers expressed as weight or mass percentages
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2203/00—Applications
- C08L2203/02—Applications for biomedical use
Definitions
- the present invention relates to a dental composition used in the field of dentistry.
- restoration with a dental bonding material and a dental composite resin has been generally performed.
- the work is usually performed by the following procedure. First, the carious portion is scraped to form a cavity, then a dental bonding material is applied to the cavity, and then the portion to which the dental bonding material is applied is irradiated with visible light to be cured. Next, the dental composite resin is filled on the cured dental bonding material layer, and the finally filled dental composite resin is irradiated with visible light to be cured.
- Dental composite resins have become widely used in recent years in place of the metal materials that have been conventionally used because they have aesthetics and excellent operability similar to those of natural teeth.
- Dental composite resins are generally mainly composed of a polymerizable monomer, a polymerization initiator, and a filler.
- a polymerizable monomer safety in a living body and mechanical strength of a cured product have been used so far.
- Radical-polymerizable polyfunctional (meth) acrylates are generally used from the viewpoint of abrasion resistance and abrasion resistance.
- 2,2-bis [4- (3-methacryloyloxy-2-hydroxypropoxy) phenyl] propane (Bis-GMA) and 2,2,4-trimethylhexamethylenebis (2-carbamoyloxyethyl) dimethacrylate (UDMA) is widely used.
- Bis-GMA, UDMA and the like have a high viscosity by themselves, they are generally used by diluting them with a relatively low viscosity polymerizable monomer such as triethylene glycol dimethacrylate (3G).
- the dental composite resin is peeled off from the adhesive surface and causes a contraction gap, so it is strongly desired to reduce it as much as possible.
- the occurrence of contraction gaps causes secondary caries, pulp irritation, coloring, and loss of restorations.
- Patent Document 1 discloses a dental composition in which a polymerization shrinkage stress is suppressed by using a dendritic polymer.
- Patent Document 2 discloses a dental composition in which the polymerization shrinkage stress is suppressed by using a macrocyclic oligomer.
- Patent Document 3 discloses a particle composite material composed of an organic binder and an inorganic filler, and Patent Document 4 discloses a fine metal powder, (meth) acrylic polymer particles, and a polymerizable monomer component.
- Patent Document 5 describes a transparent external filler composed of particles having a maximum diameter of 0.5 mm to 4.0 mm.
- a dental filling restoration kit comprising a dental polymerizable composition comprising a radically polymerizable monomer and a photopolymerization initiator is disclosed.
- Patent Document 1 the suppression of the polymerization shrinkage stress is not sufficient, and since the weight average molecular weight of the dendritic polymer is 20,000 or more, the viscosity of the composition is also high, so that the inorganic filler The filling rate could not be increased, and the strength was insufficient. Further, in Patent Document 2, in addition to the fact that the suppression of the polymerization shrinkage stress is not sufficient even by the means, as a phenomenon similar to that in Patent Document 1, the inclusion of the macrocyclic oligomer causes high viscosity, so that the inorganic filler is used. The filling rate cannot be increased completely, and the strength is insufficient.
- Patent Document 3 since a large amount of a particle composite material having a large particle size is contained, the paste has a roughness, and further, since the particle composite material is treated with a polymerizable monomer, it is polymerized at the time of curing. As a result, the effect of reducing the polymerization shrinkage stress was insufficient.
- Patent Document 4 since (meth) acrylic polymer particles occupy most of the constituents in the dental material, the mechanical strength is insufficient as in Patent Document 3. Similar to Patent Document 3, Patent Document 5 also contains particles in the paste when a small amount of paste is used clinically because the mechanical strength is insufficient and the particle size is too large. There were cases where it was included and cases where it was not included, and it was not possible to exert its effect reliably.
- Patent Documents 6 to 9 a dental composition containing an oligomer is known (for example, Patent Documents 6 to 9).
- Patent Documents 6 to 9 since the oligomer is blended with the intention of improving the mechanical strength, there is no idea of reducing the polymerization shrinkage stress, and the present inventors have examined it. The desired effect of reducing the polymerization shrinkage stress was not observed.
- an object of the present invention is to provide a dental composition having a small polymerization shrinkage stress and excellent mechanical strength of the cured product.
- the compound (A) contains a monomer (B) having a solubility in acetone at 25 ° C. of 50 g / L or more, and a polymerization initiator (C).
- the compound (A) has a weight average molecular weight of 1,000 to 80,000, contains Tg of less than 40 ° C, and has a solubility in acetone at 25 ° C of less than 50 g / L;
- the content of the compound (A) is 0.1 to 50 parts by mass with respect to a total of 100 parts by mass of the compound (A) and the monomer (B), [1] or The dental composition according to any one of [2]; [4] The dental composition according to [2] or [3], wherein the compound having a polymerizable group contains a urethanized (meth) acrylic compound (A-1) having a urethanized (meth) acrylic compound (
- the present invention it is possible to provide a dental composition having a small polymerization shrinkage stress and an excellent mechanical strength of a cured product. Due to its characteristics, the dental composition is suitably used for dental composite resins, self-adhesive dental composite resins, dental cements and the like.
- the dental composition of the present invention has a weight average molecular weight of 1,000 to 80,000, contains Tg of less than 40 ° C., and has a solubility in acetone at 25 ° C. of less than 50 g / L (A). (Hereinafter, it may be referred to as "compound (A)”) and the monomer (B) having a solubility in acetone at 25 ° C. of 50 g / L or more (hereinafter, "monomer (B)"). It is a dental composition containing a polymerization initiator (C) and a polymerization initiator (C).
- (meth) acrylic is a general term for methacrylic acid and acrylic, and the same applies to similar expressions ("(meth) acrylic acid”, “(meth) acrylonitrile”, etc.).
- the upper limit value and the lower limit value of the numerical range can be appropriately combined.
- the compound (A) has a low glass transition temperature and is therefore a flexible material, so that a flexible phase is formed. Therefore, it is presumed that when the dental composition is polymerized and cured, the phase composed of the compound (A) is deformed to alleviate the polymerization shrinkage stress generated during the curing.
- compound (A) contains Tg having a weight average molecular weight of 1,000 to 80,000 and less than 40 ° C., and may be referred to as solubility in acetone at 25 ° C. (hereinafter, simply referred to as “solubility in acetone”). ) Is less than 50 g / L. Compound (A) is used in the dental composition of the present invention to impart a low polymerization shrinkage stress.
- the compound (A) preferably contains a compound having a polymerizable group from the viewpoint of the mechanical strength of the cured product of the dental composition.
- the polymerizable group include a vinyl group, a (meth) acrylic group and a (meth) acrylamide group, and a (meth) acrylic group and a (meth) acrylamide group are preferable, and a (meth) acrylic group is more preferable.
- Compounds having no polymerizable group and having a weight average molecular weight of 1,000 or more will be described later.
- the compound (A) having a (meth) acrylic group as a polymerizable group will be described below.
- the compound (A) having a (meth) acrylic group is large, and is referred to as a urethanized (meth) acrylic compound (A-1) having a urethane skeleton (hereinafter, referred to as “urethaneized (meth) acrylic compound (A-1)”.
- urethaneized (meth) acrylic compound (A-1) There are two types: () and (meth) acrylic compounds (A-2) that do not have a urethane skeleton.
- the urethanized (meth) acrylic compound (A-1) is preferable from the viewpoint of ease of introduction of the (meth) acrylic group and the effect of reducing the polymerization shrinkage stress.
- the urethanized (meth) acrylic compound (A-1) includes, for example, a polyol containing a polymer skeleton described later, a compound having an isocyanate group (-NCO), and a (meth) acrylic compound having a hydroxyl group (-OH). Can be easily synthesized by subjecting to an addition reaction. Further, the urethanized (meth) acrylic compound (A-1) is obtained by subjecting a (meth) acrylic compound having a hydroxyl group to a ring-open addition reaction with a lactone or an alkylene oxide, and then providing a compound having a hydroxyl group at one end. , Can be easily synthesized by an addition reaction with a compound having an isocyanate group.
- the (meth) acrylic compound that imparts a (meth) acrylic group to the polymer is, for example, a (meth) acrylic acid introduced into a polymer of a monomer having a hydroxyl group by a dehydration condensation reaction. Can be done.
- the urethaneized (meth) acrylic compound (A-1) has a structure (polymer skeleton) selected from the group consisting of polyester, polycarbonate, polyurethane, polyether, polyconjugated diene, and hydrogenated polyconjugated diene in addition to the urethane bond.
- the polyester includes a dicarboxylic acid (aromatic dicarboxylic acid such as phthalic acid and isophthalic acid; unsaturated aliphatic dicarboxylic acid such as maleic acid) and 2 to 2 carbon atoms.
- aromatic dicarboxylic acid such as phthalic acid and isophthalic acid
- unsaturated aliphatic dicarboxylic acid such as maleic acid
- a polymer of 18 aliphatic diols a polymer of a dicarboxylic acid (saturated aliphatic dicarboxylic acid such as adipic acid and sebacic acid) and a polymer of an aliphatic diol having 2 to 18 carbon atoms, a polymer of ⁇ -propiolactone, ⁇ - Examples thereof include butyrolactone polymers, ⁇ -valerolactone polymers, ⁇ -caprolactone polymers and copolymers thereof, and include dicarboxylic acids (aromatic dicarboxylic acids such as phthalic acid and isophthalic acid; unsaturated fats such as maleic acid.
- dicarboxylic acids aromatic dicarboxylic acids such as phthalic acid and isophthalic acid
- unsaturated fats such as maleic acid.
- a polymer of a group dicarboxylic acid) and an aliphatic diol having 2 to 12 carbon atoms or a polymer of a dicarboxylic acid (saturated aliphatic dicarboxylic acid such as adipic acid or sebacic acid) and an aliphatic diol having 2 to 12 carbon atoms is preferable.
- the polycarbonate include polycarbonate derived from an aliphatic diol having 2 to 18 carbon atoms, polycarbonate derived from bisphenol A, and polycarbonate derived from an aliphatic diol having 2 to 18 carbon atoms and bisphenol A.
- Polycarbonates derived from aliphatic diols having 2 to 12 carbon atoms, polycarbonates derived from bisphenol A, and polycarbonates derived from aliphatic diols having 2 to 12 carbon atoms and bisphenol A are preferable.
- polyurethane include polymers of aliphatic diols having 2 to 18 carbon atoms and diisocyanates having 1 to 18 carbon atoms, and polymers of aliphatic diols having 2 to 12 carbon atoms and diisocyanates having 1 to 12 carbon atoms.
- the polyether include polyethylene glycol, polypropylene glycol, polybutylene glycol, poly (1-methylbutylene glycol) and the like.
- polyconjugated diene and hydrogenated polyconjugated diene examples include 1,4-polybutadiene, 1,2-polybutadiene, polyisoprene, poly (butadiene-isoprene), poly (butadiene-styrene), poly (isoprene-styrene), polyfarnesene, and the like. And these hydroisoprenes.
- the structures of polyester, polycarbonate and polyconjugated diene are preferable in terms of excellent flexibility and water resistance.
- the polyol having the above-mentioned polymer skeleton can be used.
- Examples of the compound having an isocyanate group include hexamethylene diisocyanate (HDI), tolylene diisocyanate (TDI), xylylene diisocyanate (XDI), diphenylmethane diisocyanate (MDI), isophorone diisocyanate (IPDI), and trimethylhexamethylene diisocyanate (TMHMDI). , Tricyclodecane diisocyanate (TCDDI), adamantan diisocyanate (ADI) and the like.
- HDI hexamethylene diisocyanate
- TDI tolylene diisocyanate
- XDI xylylene diisocyanate
- MDI diphenylmethane diisocyanate
- IPDI isophorone diisocyanate
- THMDI trimethylhexamethylene diisocyanate
- THCMDI trimethylhexamethylene diisocyanate
- Examples of the (meth) acrylic compound having a hydroxyl group include 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 2-hydroxybutyl (meth) acrylate, and 6-hydroxyhexyl (meth) acrylate, 10 -Hydroxydecyl (meth) acrylate, 3-chloro-2-hydroxypropyl (meth) acrylate, 2-hydroxy-3-phenoxypropyl (meth) acrylate, glycerin mono (meth) acrylate, 2-hydroxy-3-acryloyloxypropyl (Meta) Acrylate, 2,2-bis [4- [3- (meth) acryloyloxy-2-hydroxypropoxy] phenyl] Propane, 1,2-bis [3- (meth) acryloyloxy-2-hydroxypropoxy] Hydroxy (meth) acrylate compounds such as ethane, pentaerythritol tri (meth) acrylate, dipent
- Examples of the aliphatic diol having a branched structure and having 4 to 18 carbon atoms include 2-methyl-1,3-propanediol, 2,2-diethyl-1,3-propanediol, and 1,3-butanediol.
- an aliphatic diol as a polyol component
- Dimethyl-1,8-octanediol is more preferred, and 3-methyl-1,5-pentanediol and 2-methyl-1,8-octanediol are even more preferred.
- the addition reaction between the compound having an isocyanate group and the (meth) acrylic compound having a hydroxyl group can be carried out according to a known method, and is not particularly limited.
- the obtained urethanized (meth) acrylic compound (A-1) has at least one structure selected from the group consisting of polyester, polycarbonate, polyurethane, polyether, polyconjugated diene, and hydrogenated polyconjugated diene. Examples thereof include a reaction product of any combination of a polyol having an isocyanate group, a compound having an isocyanate group, and a (meth) acrylic compound having a hydroxyl group.
- the urethanized (meth) acrylic compound (A-) By adjusting the skeleton and molecular weight of the structure (polymer skeleton) selected from the group consisting of polyester, polycarbonate, polyurethane, polyether, polyconjugated diene, and hydrogenated polyconjugated diene, the urethanized (meth) acrylic compound (A-)
- the glass transition temperature and acetone solubility of 1) can be adjusted.
- the weight average molecular weight per polymerizable group in the urethanized (meth) acrylic compound (A-1) is preferably 1,250 or more and less than 20,000, more preferably 1,500 or more and 17,500 or less, and more preferably 1,800. More than 16,000 or less is more preferable, and 2,500 or more and 15,000 or less are particularly preferable.
- the number of polymerizable groups of the urethanized (meth) acrylic compound (A-1) is in the above range, appropriate cross-linking occurs, and more effectively, the mechanical strength is maintained while suppressing the polymerization shrinkage stress. Is possible.
- the (meth) acrylic compound (A-2) having no urethane skeleton has a structure (polymer skeleton) selected from the group consisting of polyester, polycarbonate, polyurethane, polyether, polyconjugated diene, and hydrogenated polyconjugated diene. .. These are not particularly limited as long as they have the above-mentioned structure, but for example, as the polyester, a polymer of phthalic acid and an alkylene diol having 2 to 12 carbon atoms, a polymer of adipic acid and a polymer of an alkylene glycol having 2 to 12 carbon atoms, and malein.
- Polymers of acid and alkylene diols having 2 to 12 carbon atoms, ⁇ -propiolactone polymers, ⁇ -butyrolactone polymers, ⁇ -valerolactone polymers, ⁇ -caprolactone polymers and copolymers thereof Can be mentioned.
- the polycarbonate include polycarbonate derived from an aliphatic diol having 2 to 12 carbon atoms, polycarbonate derived from bisphenol A, and polycarbonate derived from an aliphatic diol having 2 to 12 carbon atoms and bisphenol A.
- Examples of the polyurethane include a polymer of an aliphatic diol having 2 to 12 carbon atoms and a diisocyanate having 1 to 12 carbon atoms.
- polyether examples include polyethylene glycol, polypropylene glycol, polybutylene glycol, poly (1-methylbutylene glycol) and the like.
- polyconjugated diene and hydrogenated polyconjugated diene examples include 1,4-polybutadiene, 1,2-polybutadiene, polyisoprene, poly (butadiene-isoprene), poly (butadiene-styrene), poly (isoprene-styrene), polyfarnesene, and the like. And these hydroisoprenes.
- the structures of polyester, polycarbonate and polyconjugated diene are preferable in terms of excellent flexibility and water resistance.
- the polyol having the above-mentioned polymer skeleton can be used.
- the glass transition temperature and acetone solubility of the compound (A-2) can be adjusted.
- Examples of the (meth) acrylic compound having a hydroxyl group include 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 2-hydroxybutyl (meth) acrylate, and 6-hydroxyhexyl (meth) acrylate, 10 -Hydroxydecyl (meth) acrylate, 3-chloro-2-hydroxypropyl (meth) acrylate, 2-hydroxy-3-phenoxypropyl (meth) acrylate, glycerin mono (meth) acrylate, 2-hydroxy-3-acryloyloxypropyl (Meta) Acrylate, 2,2-bis [4- [3- (meth) acryloyloxy-2-hydroxypropoxy] phenyl] Propane, 1,2-bis [3- (meth) acryloyloxy-2-hydroxypropoxy] Hydroxy (meth) acrylate compounds such as ethane, pentaerythritol tri (meth) acrylate, dipent
- the obtained (meth) acrylic compound (A-2) having no urethane skeleton is at least selected from the group consisting of polyester, polycarbonate, polyurethane, polyether, polyconjugated diene, and hydrogenated polyconjugated diene. Examples thereof include reactants of any combination of a polyol having one type of structure and a (meth) acrylic compound having a hydroxyl group.
- the weight average molecular weight per polymerizable group in the (meth) acrylic compound (A-2) having no urethane skeleton is preferably 1,250 or more and less than 20,000, and 1,500 or more and 17,500 or less. More preferably, it is more preferably 1,800 or more and 16,000 or less, and particularly preferably 2,500 or more and 15,000 or less.
- a compound having no polymerizable group and having a weight average molecular weight of 1,000 or more has a urethane skeleton and has no polymerizable group.
- a compound (A-3) having a molecular weight of 1,000 or more (hereinafter, may be referred to as “compound (A-3)”) and a urethane skeleton and a weight average molecular weight of 1,000 or more having no polymerizable group. It can be classified into two types of compound (A-4) (hereinafter, may be referred to as “compound (A-4)”), and compound (A-3) is preferable.
- a dental composition comprising compound (A), monomer (B), and polymerization initiator (C) and not compound (A-3) and / or compound (A-4). Can be mentioned.
- the compound (A-3) has a structure (polymer skeleton) selected from the group consisting of polyester, polycarbonate, polyurethane, polyether, polyconjugated diene, and hydrogenated polyconjugated diene, in addition to the urethane bond.
- a structure selected from the group consisting of polyester, polycarbonate, polyurethane, polyether, polyconjugated diene, and hydrogenated polyconjugated diene, in addition to the urethane bond.
- polyester a polymer of phthalic acid and an alkylene diol having 2 to 12 carbon atoms
- a polymer of adipic acid and a polymer of an alkylene glycol having 2 to 12 carbon atoms, and malein.
- Polymers of acid and alkylene diols having 2 to 12 carbon atoms, ⁇ -propiolactone polymers, ⁇ -butyrolactone polymers, ⁇ -valerolactone polymers, ⁇ -caprolactone polymers and copolymers thereof Can be mentioned.
- the polycarbonate include polycarbonate derived from an aliphatic diol having 2 to 12 carbon atoms, polycarbonate derived from bisphenol A, and polycarbonate derived from an aliphatic diol having 2 to 12 carbon atoms and bisphenol A.
- Examples of the polyurethane include a polymer of an aliphatic diol having 2 to 12 carbon atoms and a diisocyanate having 1 to 12 carbon atoms.
- polyether examples include polyethylene glycol, polypropylene glycol, polybutylene glycol, poly (1-methylbutylene glycol) and the like.
- polyconjugated diene and hydrogenated polyconjugated diene examples include 1,4-polybutadiene, 1,2-polybutadiene, polyisoprene, poly (butadiene-isoprene), poly (butadiene-styrene), poly (isoprene-styrene), polyfarnesene, and the like. And these hydroisoprenes.
- the structures of polyester, polycarbonate and polyconjugated diene are preferable in terms of excellent flexibility and water resistance.
- the above-mentioned polyol having a polymer skeleton can be used.
- the skeleton and molecular weight of the structure (polymer skeleton) selected from the group consisting of polyester, polycarbonate, polyurethane, polyether, polyconjugated diene, and hydrogenated polyconjugated diene the glass transition temperature of compound (A-3) can be adjusted.
- acetone solubility can be adjusted.
- Examples of the compound having an isocyanate group include hexamethylene diisocyanate (HDI), tolylene diisocyanate (TDI), xylylene diisocyanate (XDI), diphenylmethane diisocyanate (MDI), isophorone diisocyanate (IPDI), and trimethylhexamethylene diisocyanate (TMHMDI). , Tricyclodecane diisocyanate (TCDDI), adamantan diisocyanate (ADI) and the like.
- HDI hexamethylene diisocyanate
- TDI tolylene diisocyanate
- XDI xylylene diisocyanate
- MDI diphenylmethane diisocyanate
- IPDI isophorone diisocyanate
- THMDI trimethylhexamethylene diisocyanate
- THCMDI trimethylhexamethylene diisocyanate
- the compound having a hydroxyl group is not particularly limited as long as it does not have a polymerizable group, and known compounds can be used.
- the compound having a hydroxyl group for example, the above-mentioned polyol can be used.
- the addition reaction between the compound having an isocyanate group and the compound having a hydroxyl group can be carried out according to a known method, and is not particularly limited.
- the obtained compound (A-3) is a polyol having at least one structure selected from the group consisting of polyester, polycarbonate, polyurethane, polyether, polyconjugated diene, and hydrogenated polyconjugated diene, or a polyol. And a reactant of the compound having an isocyanate group.
- the weight average molecular weight (Mw) of the compound (A) is 1,000 to 80,000 from the viewpoint of contributing to obtaining the desired solubility in acetone and reducing the viscosity and the polymerization shrinkage stress. , 2,000 to 50,000, more preferably 3,000 to 20,000.
- the weight average molecular weight (Mw) in the present invention means a polystyrene-equivalent weight average molecular weight determined by gel permeation chromatography (GPC), and can be measured by a known method.
- the polar difference between the compound (A) and the monomer (B) is important, and the compound (B) has a higher solubility in acetone than the compound (B).
- A) needs to have low solubility in acetone.
- the solubility of compound (A) in acetone needs to be less than 50 g / L, preferably less than 30 g / L, more preferably less than 25 g / L. It is preferable, more preferably less than 20 g / L, and particularly preferably less than 10 g / L.
- the solubility parameter (SP) value may be used as a parameter for measuring the difference in polarity and the difference in compatibility between the compound (A) and the monomer (B).
- the SP value is a measure of solubility, and the larger the value, the higher the polarity, and conversely, the smaller the value, the lower the polarity.
- the difference in SP value between the compound (A) and the monomer (B) is preferably 1.0 (cal / cm 3 ) 1/2 or more, preferably 2.0 (cal / cm).
- the SP value can be measured by the following method. Weigh 0.5 g of the sample into a 100 mL Erlenmeyer flask and add 10 mL of acetone to dissolve. Hexane is added dropwise to this while stirring with a magnetic stirrer, and the amount of hexane added (vh) at the point where the solution becomes turbid (dakuten) is determined. Next, the dropping amount (vd) of the deionized water at the dakuten when deionized water is used instead of hexane is determined.
- Compound (A) needs to contain at least one glass transition temperature (hereinafter, may be simply abbreviated as "Tg") of less than 40 ° C.
- Tg glass transition temperature
- the Tg is not particularly limited as long as it is less than 40 ° C., but is preferably in the temperature range of ⁇ 100 ° C. to 30 ° C., preferably in the temperature range of ⁇ 75 ° C. to 15 ° C. from the viewpoint of being excellent in the effect of reducing the polymerization shrinkage stress. It is more preferably in the temperature range of ⁇ 60 ° C. to 10 ° C. When the Tg of the compound (A) is only 40 ° C.
- compound (A) may have a plurality of Tg, in which case one Tg may be less than 40 ° C and the other Tg may be in the temperature range of 40 ° C or higher. good.
- compound (A) also contains a compound having two Tg, one having a Tg of ⁇ 42 ° C. and the other having a Tg of 44.6 ° C.
- an aromatic ring is used as a skeleton of the urethanized (meth) acrylic compound (A-1) in order to prevent the glass transition temperature from becoming high in order to adjust the glass transition region to less than 40 ° C.
- a urethanized (meth) acrylic compound (A-1a) that does not contain it is preferable.
- a urethanized (meth) acrylic compound (A-1b) containing no cyclic structure (aromatic ring, heterocycle, alicyclic structure) in the skeleton in order to adjust the glass transition region to less than 40 ° C. is preferable.
- another embodiment includes compound (A), a monomer (B) having a solubility in acetone at 25 ° C.
- the compound (A) has a weight average molecular weight of 1,000 to 80,000, contains Tg of less than 40 ° C, and has a solubility in acetone at 25 ° C of less than 50 g / L.
- Dental composition containing Tg below 40 ° C, solubility in acetone at 25 ° C of 50 g / L or more, and no compound having a weight average molecular weight of 2,000 or more (for example, (meth) acrylic compound, etc.) Things can be mentioned.
- the glass transition temperature (Tg) in the present invention means the intermediate point glass transition temperature (T mg ).
- the glass transition temperature (Tg) used in the present invention is specifically determined by measuring based on JIS K 7121-1987 (supplemented in 2012).
- the baseline means a DTA curve or DSC curve in a temperature range in which glass transition and reaction do not occur in the measured sample as defined in JIS K 7121-1987 (Supplementary 2012).
- the midpoint glass transition temperature (T mg ) is the temperature at the intersection of a straight line at an equal distance in the vertical axis direction from the extended straight line of each baseline and the curve of the stepwise change portion of the glass transition.
- the extra glass transition start temperature ( Tig ) is a straight line extending the baseline on the low temperature side to the high temperature side and a tangent line drawn at a point where the slope of the curve of the stepped change portion of the glass transition is maximized. Let it be the temperature of the intersection of.
- the extra glass transition end temperature ( Teg ) is a straight line extending the baseline on the high temperature side to the low temperature side and a tangent line drawn at a point where the slope of the curve of the stepwise change portion of the glass transition is maximized. Let it be the temperature of the intersection of.
- the measurement method and measurement conditions regarding the glass transition temperature of the present invention are as described in Examples described later using the heat flux DSC.
- the compound (A) preferably has two or more glass transition temperatures, and more preferably two.
- Tg glass transition temperatures
- the Tg at the first point (low temperature side region) is preferably ⁇ 100 ° C. or higher and 20 ° C. or lower, more preferably ⁇ 75 ° C. or higher and 15 ° C. or lower, and even more preferably ⁇ 60 ° C. or higher and 10 ° C. or lower.
- the Tg at the second point (high temperature side region) is preferably 20 ° C. or higher and lower than 80 ° C., more preferably 25 ° C.
- the compound (A) has one or more glass transition temperatures in a temperature range of ⁇ 100 ° C. or higher and 20 ° C. or lower, and one or more in a temperature range of 20 ° C. or higher and lower than 80 ° C.
- Dental compositions having a glass transition temperature can be mentioned.
- Other embodiments include compound (A), monomer (B) having a solubility in acetone at 25 ° C. or higher, and polymerization initiator (C).
- the compound (A) has a weight average molecular weight of 1,000 to 80,000, contains Tg of less than 40 ° C, and has a solubility in acetone at 25 ° C of less than 50 g / L. Examples thereof include dental compositions that do not have two or more glass transition temperatures and do not contain a compound having a weight average molecular weight of 2,000 or more (for example, a (meth) acrylic compound or the like).
- Another embodiment comprises compound (A), a monomer (B) having a solubility in acetone at 25 ° C.
- the compound (A) has a weight average molecular weight of 1,000 to 80,000, contains Tg of less than 40 ° C, and has a solubility in acetone at 25 ° C of less than 50 g / L. It does not have two or more glass transition temperatures, has a weight average molecular weight of 5,000 to 50,000, and has a weight average molecular weight of 1,250 or more and less than 20,000 per (meth) acrylic group ((meth)). Meta) Examples include dental compositions that do not contain acrylic compounds.
- the viscosity of compound (A) at 25 ° C. is preferably 1,000 to 10,000,000 cps, more preferably 5,000 to 7,500,000 cps, from the viewpoint of operability and the effect of reducing polymerization shrinkage stress. More preferably, 000 to 7,000,000 cps.
- the viscosity in the present invention means the viscosity measured by the Brookfield viscometer at 25 ° C. Measurement conditions such as time and rotation speed are appropriately adjusted according to the viscosity range.
- urethane polymers having a polymerizable group at the ends such as the "Art Resin” series (UN-7600, UN7700) manufactured by Negami Kogyo Co., Ltd., polyisoprene skeleton manufactured by Kuraray Co., Ltd., or polybutadiene skeleton.
- a certain "polymer” series (LIR-30, LIR-50, LIR-390, LIR-403, LIR-410, UC-102M, UC-203M, LIR-700, LBR-302, LBR-307, LBR-305, LBR-352, LBR-361, L-SBR-820, L-SBR-841), Polymers manufactured by Kuraray Co., Ltd. (P-6010, P-5010, P-4010, P-3010, P-2010, P- 1010, F-3010, F2010, F-1010, P-2011, P-1020, P-2020, P-530, P-2030, P-2050, C-2090), liquid polybutadiene manufactured by Nippon Soda Co., Ltd.
- NISSO-PB (B-1000, B-2000, B-3000, BI-2000, BI-3000, G-1000, G-2000, G-3000, GI-1000, GI-2000, GI-3000, TEAI" -1000, TE-2000, TE-4000, JP-100, JP-200) and the like, UN-7600, UN7700, LBR-302, LBR-307, LBR-305, LBR-352, LBR-361, L-SBR-820, UC-102M, UC-203M, C-2090, P-2020, P-2050, B3000, BI-2000, BI-3000, TEAI-1000, TE-2000, TE-4000 are preferable.
- UN-7600, UC-102M, TE-2000 and TE-4000 are more preferable.
- the content of the compound (A) in the dental composition of the present invention has an effect of reducing mechanical strength, paste properties, and polymerization shrinkage stress with respect to a total of 100 parts by mass of the compound (A) and the monomer (B).
- the content is preferably 0.1 to 50 parts by mass, and phase separation such as the sea-island structure is likely to occur with the monomer (B).
- the content is 0.5 to 40 parts by mass. It is more preferably 1 to 35 parts by mass, further preferably 1 to 25 parts by mass, and particularly preferably 1 to 18 parts by mass.
- the content of the compound (A) is preferably 0.1% by mass or more in the total amount of the dental composition from the viewpoint of mechanical strength, paste properties, and effect of reducing polymerization shrinkage stress. 5% by mass or more is more preferable, and 1% by mass or more is further preferable.
- the content of the compound (A) is preferably 30% by mass or less, more preferably 25% by mass or less, based on the total amount of the dental composition, from the viewpoints of mechanical strength, paste properties, and effect of reducing polymerization shrinkage stress. , 20% by mass or less is more preferable.
- the monomer (B) one having a high solubility in acetone is used, and specifically, the solubility in acetone at 25 ° C. is 50 g / L or more, preferably 75 g / L or more. More preferably, it is 90 g / L or more.
- the monomer (B) one type may be used alone, or two or more types may be used in combination.
- a monomer having an acidic group (B-1), a hydrophobic monomer having no acidic group (B-2), and a hydrophilic monomer having no acidic group (B) -3) can be mentioned.
- those having a high solubility in acetone of the mixture (the solubility of the mixture in acetone at 25 ° C. is 50 g / L or more) may be used.
- -Solubility of compound (A) in acetone is preferably 10 g / L or more, more preferably 20 g / L or more, and even more preferably 30 g / L or more.
- the difference between the solubility of the monomer (B) in acetone and the solubility of the compound (A) in acetone is not particularly limited as the larger the polar difference is, the more easily phase separation occurs. Therefore, the upper limit is not particularly limited and 300 g. It may be / L or less, 200 g / L or less, and 150 g / L or less. Further, in such an embodiment, the low glass transition temperature of the compound (A) makes it easier for the compound (A) to form a more flexible phase, whereby the dental composition is more excellent in the effect of reducing the polymerization shrinkage stress. You can get things.
- the monomer (B-1) having an acidic group has an acid etching effect and a primer treatment effect, and is a component that gives a decalcifying action and a penetrating action. Further, the monomer (B-1) having an acidic group can be polymerized and imparts a curing action. By containing the monomer (B-1) having an acidic group, the adhesiveness to the dentin and the adhesive durability are improved.
- the monomer (B-1) having an acidic group has at least one acidic group such as a phosphoric acid group, a pyrophosphate group, a thiophosphate group, a phosphonic acid group, a sulfonic acid group and a carboxylic acid group, and has an acidic group.
- Examples thereof include a monomer having at least one polymerizable group such as a (meth) acryloyl group, a vinyl group and a styrene group. From the viewpoint of adhesiveness to the dentin, a phosphoric acid group-containing monomer is preferable. Specific examples of the monomer (B-1) having an acidic group are given below.
- Examples of the phosphate group-containing monomer include 2- (meth) acryloyloxyethyl dihydrogen phosphate, 3- (meth) acryloyloxypropyl dihydrogen phosphate, 4- (meth) acryloyloxybutyl dihydrogen phosphate, and 5- (meth). ) Acryloyloxypentyl dihydrogen phosphate, 6- (meth) acryloyl oxyhexyl dihydrogen phosphate, 7- (meth) acryloyl oxyheptyl dihydrogen phosphate, 8- (meth) acryloyl oxyoctyl dihydrogen phosphate, 9- (meth) acryloyl.
- Oxynonyldihydrogenphosphate 10- (meth) acryloyloxydecyldihydrogenphosphate, 11- (meth) acryloyloxyundecyldihydrogenphosphate, 12- (meth) acryloyloxide decyldihydrogenphosphate, 16- (meth) acryloyloxy Hexadecyldihydrogenphosphate, 20- (meth) acryloyloxyicosyldihydrogenphosphate, bis [2- (meth) acryloyloxyethyl] hydrogenphosphate, bis [4- (meth) acryloyloxybutyl] hydrogenphosphate, bis [6- (meth) acryloyloxyhexyl] hydrogenphosphate, bis [8- (meth) acryloyloxyoctyl] hydrogenphosphate, bis [9- (meth) acryloyloxynonyl] hydrogenphosphate, bis [10- (meth) ) Ac
- Examples of the pyrophosphate group-containing monomer include bis pyrophosphate [2- (meth) acryloyloxyethyl], bis pyrophosphate [4- (meth) acryloyloxybutyl], and bis pyrophosphate [6- (meth) acryloyloxyhexyl. ], Bispyrophosphate [8- (meth) acryloyloxyoctyl], bispyrophosphate [10- (meth) acryloyloxydecyl] and their acid salts, alkali metal salts, ammonium salts.
- Examples of the thiophosphate group-containing monomer include 2- (meth) acryloyloxyethyl dihydrogenthiophosphate, 3- (meth) acryloyloxypropyldihydrogenthiophosphate, 4- (meth) acryloyloxybutyldihydrogenthiophosphate, and 5, -(Meta) Acryloyloxypentyl dihydrogenthiophosphate, 6- (Meta) Acryloyloxyhexyl dihydrogenthiophosphate, 7- (Meta) Acryloyloxyheptyl dihydrogenthiophosphate, 8- (Meta) Acryloyloxyoctyldihydrogenthiophosphate , 9- (meth) acryloyloxynonyldihydrogenthiophosphate, 10- (meth) acryloyloxydecyldihydrogenthiophosphate, 11- (meth) acryloyloxyundecyldihydrogenthi
- Examples of the phosphonic acid group-containing monomer include 2- (meth) acryloyloxyethylphenylphosphonate, 5- (meth) acryloyloxypentyl-3-phosphonopropionate, and 6- (meth) acryloyloxyhexyl-3-phospho. Nopropionate, 10- (meth) acryloyloxydecyl-3-phosphonopropionate, 6- (meth) acryloyloxyhexyl-3-phosphonoacetate, 10- (meth) acryloyloxydecyl-3-phosphono Examples thereof include acetates and their acid salts, alkali metal salts and ammonium salts.
- sulfonic acid group-containing monomer examples include 2- (meth) acrylamide-2-methylpropanesulfonic acid, styrenesulfonic acid, and 2-sulfoethyl (meth) acrylate.
- Examples of the carboxylic acid group-containing monomer include a monomer having one carboxy group in the molecule and a monomer having a plurality of carboxy groups in the molecule.
- Examples of the monomer having one carboxy group in the molecule include (meth) acrylic acid, N- (meth) acryloylglycine, N- (meth) acryloylbenzoic acid, O- (meth) acryloyl tyrosine, and N- (meth).
- Examples of the monomer having a plurality of carboxy groups in the molecule include 6- (meth) acryloyloxyhexane-1,1-dicarboxylic acid and 9- (meth) acryloyloxynonane-1,1-dicarboxylic acid, 10- ( Meta) Acryloyloxydecane-1,1-dicarboxylic acid, 11- (meth) acryloyloxyundecane-1,1-dicarboxylic acid, 12- (meth) acryloyloxide decane-1,1-dicarboxylic acid, 13- (meth) Acryloyloxytridecane-1,1-dicarboxylic acid, 4- (meth) acryloyloxyethyl trimellitate, 4- (meth) acryloyloxyethyl trimellitate hydride, 4- (meth) acryloyloxybutyl trimellitate, 4- (Meta) acryloyloxyhexyl trimertate,
- a phosphoric acid group or a pyrophosphate group-containing (meth) acrylic monomer is preferable because it exhibits better adhesiveness to the dentin.
- a phosphoric acid group-containing (meth) acrylic monomer is more preferable.
- divalent phosphorus having an alkyl group or an alkylene group having 6 to 20 carbon atoms as a main chain in the molecule in that it exhibits high decalcification and high adhesiveness in the absence of an organic solvent.
- Acid group-containing (meth) acrylic monomers are more preferred, and contain divalent phosphate groups having an alkylene group having 8 to 12 carbon atoms as the main chain in the molecule such as 10-methacryloyloxydecyldihydrogen phosphate (10-methacryloyloxydecyldihydrogen phosphate). Meta) Acrylic monomers are particularly preferred.
- the monomer (B-1) having an acidic group one type may be used alone, or two or more types may be used in combination.
- the content of the monomer (B-1) having an acidic group is 1 to 50 parts by mass with respect to 100 parts by mass in total of the compound (A) and the monomer (B) in the dental composition.
- the range is preferable, the range of 3 to 40 parts by mass is more preferable, and the range of 5 to 30 parts by mass is further preferable.
- hydrophobic monomer (B-2) having no acidic group improves the mechanical strength, handleability and the like of the dental composition.
- the hydrophobic monomer (B-2) is preferably a radical monomer having no acidic group and having a polymerizable group, and the polymerizable group is a (meth) acrylic group and from the viewpoint of easy radical polymerization. / Or a (meth) acrylamide group is more preferred.
- the hydrophobic monomer (B-2) means a monomer having no acidic group and having a solubility in water at 25 ° C. of less than 10% by mass, and is, for example, an aromatic compound-based bifunctionality. Examples thereof include cross-functional monomers such as monomers, aliphatic compound-based bifunctional monomers, and trifunctional or higher-functional monomers.
- aromatic compound-based bifunctional monomer examples include 2,2-bis ((meth) acryloyloxyphenyl) propane and 2,2-bis [4- (3- (meth) acryloyloxy-2-). Hydroxypropoxy) 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) acryloyloxydipropoxyphenyl) propane, 2- (4- (meth) acryl
- 2,2-bis [4- (3-methacryloyloxy-2-hydroxypropoxy) phenyl] propane (commonly known as "Bis-GMA")
- 2,2-bis (4- (meth) acryloyloxyethoxyphenyl) ) Propane 2,2-bis (4-methacryloyloxypolyethoxyphenyl) propane (with an average number of added moles of 2.6 ethoxy groups, commonly known as "D-2.6E”
- 2,2-bis (4) -(Meta) 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.
- Examples of the aliphatic compound-based bifunctional monomer include glycerol di (meth) acrylate, ethylene glycol di (meth) acrylate, diethylene glycol di (meth) acrylate, triethylene glycol di (meth) acrylate, and propylene glycol di.
- 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-trimethylhexamethylene bis (2-carbamoyloxyethyl) dimethacrylate
- UDM 2,4-trimethylhexamethylene bis
- DD 1,10-decanediol dimethacrylate
- MAEA N-methacryloyloxyethylacrylamide
- trifunctional or higher monomer examples include trimethylolpropane tri (meth) acrylate, trimethylolethanetri (meth) acrylate, trimethylolmethanetri (meth) acrylate, pentaerythritol tri (meth) acrylate, and pentaerythritol.
- examples thereof include 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 preferable.
- aromatic compound-based bifunctional monomers and aliphatic compound-based bifunctional monomers are included from the viewpoint of mechanical strength and handleability. It is preferably used.
- aromatic compound-based bifunctional monomer Bis-GMA and D-2.6E are preferable.
- Aliphatic compound-based bifunctional monomers 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.
- the hydrophobic monomer (B-2) one type may be blended alone, or two or more types may be used in combination. If the content of the hydrophobic monomer (B-2) is too high, the permeability of the composition into the dentin may decrease and the adhesive strength may decrease. If the content is too low, the permeability may decrease. The effect of improving the mechanical strength may not be sufficiently obtained. Therefore, the hydrophobic monomer (B-2) is preferably in the range of 20 to 99 parts by mass, preferably 40 parts by mass, based on 100 parts by mass of the total of the compound (A) and the monomer (B) in the dental composition. The range of to 95 parts by mass is more preferable, and the range of 60 to 92 parts by mass is further preferable.
- the content of the hydrophobic monomer (B-2) is 1% by mass or more in the total amount of the dental composition from the viewpoint of mechanical strength, paste properties, and effect of reducing polymerization shrinkage stress. It is preferable, 5% by mass or more is more preferable, and 10% by mass or more is further preferable.
- the content of the hydrophobic monomer (B-2) is preferably 48% by mass or less in the total amount of the dental composition from the viewpoint of mechanical strength, paste properties, and effect of reducing polymerization shrinkage stress. It is more preferably mass% or less, and further preferably 35 mass% or less.
- the dental composition of the present invention preferably further contains a hydrophilic monomer (B-3) having no acidic group (hereinafter referred to as a hydrophilic monomer (B-3)).
- the hydrophilic monomer (B-3) promotes the permeation of the components of the dental composition into the dentin, and at the same time, permeates the dentin itself and adheres to the organic component (collagen) in the dentin.
- a radical monomer having no acidic group and having a polymerizable group is preferable, and the polymerizable group is a (meth) acrylic group from the viewpoint of easy radical polymerization.
- the hydrophilic monomer (B-3) has no acidic group and has a solubility in water at 25 ° C. of 10% by mass or more, and a solubility of 30% by mass or more is preferable. Those that can be dissolved in water at an arbitrary ratio at 25 ° C. are more preferable.
- the hydrophilic monomer (B-3) those having a hydrophilic group such as a hydroxyl group, an oxymethylene group, an oxyethylene group, an oxypropanol group and an amide group are preferable, and for example, 2-hydroxyethyl (meth).
- HEMA Acrylate
- 2-hydroxypropyl (meth) acrylate 1,3-dihydroxypropyl (meth) acrylate, 2,3-dihydroxypropyl (meth) acrylate, 2-((meth) ) Acryloyloxy)
- Hydrophilic monofunctional (meth) acrylate-based monomers such as ethyltrimethylammonium chloride, polyethylene glycol di (meth) acrylate (with 9 or more oxyethylene groups); N-methylol (meth).
- hydrophilic monomers (B-3) 2-hydroxyethyl (meth) acrylate, 2,3-dihydroxypropyl (meth) acrylate, and hydrophilic monofunctionality (from the viewpoint of adhesiveness to dentin).
- Meta) acrylamide-based monomers are preferred, and 2-hydroxyethyl (meth) acrylates, N, N-dimethylacrylamide and N, N-diethylacrylamide are more preferred.
- the hydrophilic monomer (B-3) one type may be blended alone, or two or more types may be used in combination.
- the content of the hydrophilic monomer (B-3) in the present invention is in the range of 0 to 50 parts by mass with respect to 100 parts by mass in total of the compound (A) and the monomer (B) in the dental composition.
- the range of 0 to 40 parts by mass is more preferable, and the range of 0 to 30 parts by mass is further preferable.
- the content of the hydrophilic monomer (B-3) may be 0 parts by mass.
- the difference in solubility of the compound (A) and the monomer (B) in acetone at 25 ° C. is preferably 30 g / L or more. It is more preferably 40 g / L or more, and further preferably 50 g / L or more.
- the polymerization initiator (C) is broadly classified into a photopolymerization initiator and a chemical polymerization initiator, and the photopolymerization initiators are a water-soluble photopolymerization initiator (C-1) and a water-insoluble photopolymerization initiator (C-2). )are categorized.
- the polymerization initiator (C) only the water-soluble photopolymerization initiator (C-1) may be used, or only the water-insoluble photopolymerization initiator (C-2) may be used, and the water-soluble photopolymerization may be used.
- the initiator (C-1) and the water-insoluble photopolymerization initiator (C-2) may be used in combination.
- the water-soluble photopolymerization initiator (C-1) has improved polymerization curability at the hydrophilic tooth surface interface and can realize high adhesive strength.
- the water-soluble photopolymerization initiator (C-1) has a solubility in water at 25 ° C. of 1.0% by mass or more, preferably 1.5% by mass or more, and preferably 2.0% by mass or more. More preferably, it is more preferably 2.5% by mass or more. When the solubility is less than 1.0% by mass, the water-soluble photopolymerization initiator (C-1) is not sufficiently dissolved in water in the dentin at the adhesive interface, and polymerization at the adhesive interface is difficult to promote. Become.
- Examples of the water-soluble photopolymerization initiator (C-1) include water-soluble acylphosphine oxides, water-soluble thioxanthones, and 1- [4- (2-hydroxyethoxy) -phenyl] -2-hydroxy-2-methyl.
- ⁇ -Hydroxyalkylacetophenones such as those introduced, those introduced with -OCH 2 COO - Na + into the phenyl group of 2-hydroxy-2-methyl-1-phenylpropan-1-one; 2-methyl-1 [ 4- (Methylthio) Phenyl] -2-morpholinopropane-1-one, 2-benzyl-2-dimethylamino-1- (4-morpholinophenyl) butanone-1 and other ⁇ -aminoalkylphenones have four amino groups. Examples include those obtained by chlorinating grade ammonium.
- water-soluble thioxanthones examples include 2-hydroxy-3- (9-oxo-9H-thioxanthene-4-yloxy) -N, N, N-trimethyl-1-propaneaminium chloride, 2-hydroxy-.
- water-soluble acylphosphine oxides examples include acylphosphine oxides represented by the following general formula (1) or (2).
- R 1 , R 2 , R 3 , R 4 , R 5 , and R 6 are linear or branched alkyl groups or halogen atoms having 1 to 4 carbon atoms independently of each other, and are M.
- R 9 and R 10 are ammonium ions represented by organic groups or hydrogen atoms independently of each other, n is 1 or 2, and X is a linear or branched chain having 1 to 4 carbon atoms. It is an alkylene group, R 7 is represented by -CH (CH 3 ) COO (C 2 H 4 O) p CH 3 , and p represents an integer of 1 to 1000.
- the alkyl groups of R 1 , R 2 , R 3 , R 4 , R 5 , and R 6 are not particularly limited as long as they are linear or branched chains having 1 to 4 carbon atoms, and the methyl group, Examples thereof include an ethyl group, an n-propyl group, an isopropyl group, an n-butyl group, an isobutyl group, a sec-butyl group, a 2-methylpropyl group and a tert-butyl group.
- a linear alkyl group having 1 to 3 carbon atoms is preferable, a methyl group or an ethyl group is more preferable, and a methyl group is preferable. Is even more preferable.
- the alkylene group of X include a methylene group, an ethylene group, an n-propylene group, an isopropylene group, an n-butylene group and the like.
- a linear alkylene group having 1 to 3 carbon atoms is preferable, a methylene group or an ethylene group is more preferable, and a methylene group is further preferable.
- the substituent of the pyridine ring includes a halogen atom (fluorine atom, chlorine atom, bromine atom, iodine atom), a carboxy group, and a linear or branched acyl having 2 to 6 carbon atoms. Examples thereof include a group, a linear or branched alkyl group having 1 to 6 carbon atoms, and a linear or branched alkoxy group having 1 to 6 carbon atoms.
- alkali metal ion alkaline earth metal ion, magnesium ion, pyridinium ion (the pyridine ring may have a substituent), or HN + R 8 R 9 R 10 (in the formula, the symbol is the above).
- Ammonium ion (having the same meaning as) is preferable.
- the alkali metal ion include lithium ion, sodium ion, potassium ion, rubidium ion, and cesium ion.
- alkaline earth metal ion include calcium ion, strontium ion, barium ion, and radium ion.
- Examples of the organic group of R 8 , R 9 and R 10 include the same group as the substituent of the pyridine ring (excluding the halogen atom).
- examples of Mn + include Li + , Na + , K + , Ca 2+ , Mg 2+ , and ammonium ions derived from various amines
- examples of amines include ammonia, trimethylamine, diethylamine, and dimethyl.
- p is preferably 1 or more, more preferably 2 or more, further preferably 3 or more, particularly preferably 4 or more, preferably 1000 or less, more preferably 100 or less, and 75 or less. More preferably, 50 or less is particularly preferable.
- water-soluble acylphosphine oxides from the compound represented by the general formula (1) in which M is Li and the polyethylene glycol methyl ether methacrylate having a molecular weight of 950 in the portion corresponding to the group represented by R7 .
- the synthesized compound represented by the general formula (2) is particularly preferable.
- Water-soluble acylphosphine oxides having such a structure can be synthesized according to a known method, and some of them are also available as commercial products. For example, it can be synthesized by the method disclosed in Japanese Patent Application Laid-Open No. 57-197289, International Publication No. 2014/095724, and the like.
- the water-soluble photopolymerization initiator (C-1) may be used alone or in combination of two or more.
- the dental composition It may be dissolved in the substance or dispersed in the composition as a powder.
- the water-soluble photopolymerization initiator (C-1) When the water-soluble photopolymerization initiator (C-1) is dispersed in the composition as a powder, if the average particle size is too large, it tends to settle, so 500 ⁇ m or less is preferable, 100 ⁇ m or less is more preferable, and 50 ⁇ m or less. Is even more preferable. On the other hand, if the average particle size is too small, the specific surface area of the powder becomes excessive and the amount dispersible in the composition decreases, so 0.01 ⁇ m or more is preferable.
- the average particle size of the water-soluble photopolymerization initiator (C-1) is preferably in the range of 0.01 to 500 ⁇ m, more preferably in the range of 0.01 to 100 ⁇ m, and even more preferably in the range of 0.01 to 50 ⁇ m.
- each water-soluble photopolymerization initiator (C-1) powder use image analysis type particle size distribution measurement software (Mac-View; manufactured by Mountech) based on electron micrographs of 100 or more particles. It can be calculated as the volume average particle size after performing image analysis using it.
- Mac-View manufactured by Mountech
- the shape of the initiator when the water-soluble photopolymerization initiator (C-1) is dispersed in the composition as a powder includes various shapes such as spherical, needle-shaped, plate-shaped, and crushed, but in particular, Not limited.
- the water-soluble photopolymerization initiator (C-1) can be produced by a conventionally known method such as a pulverization method, a freeze-drying method, or a reprecipitation method, and is a freeze-drying method from the viewpoint of the average particle size of the obtained powder. And the reprecipitation method is preferable, and the freeze-drying method is more preferable.
- the content of the water-soluble photopolymerization initiator (C-1) is 100 in total of the compound (A) and the monomer (B) in the dental composition from the viewpoint of the curability of the obtained dental composition and the like. 0.01 to 20 parts by mass is preferable with respect to parts by mass, and 0.05 to 10 parts by mass is more preferable from the viewpoint of high initial adhesive force and adhesive durability and reduction of polymerization shrinkage stress, and 0.1 to 10 parts by mass. 5 parts by mass is more preferable.
- the content of the water-soluble photopolymerization initiator (C-1) is less than 0.01 parts by mass, the polymerization at the adhesive interface does not proceed sufficiently, which may lead to a decrease in the adhesive strength.
- the dental composition of the present invention initiates water-insoluble photopolymerization having a solubility in water at 25 ° C. of less than 1.0% by mass in addition to the water-soluble photopolymerization initiator (C-1).
- the agent (C-2) (hereinafter referred to as a water-insoluble photopolymerization initiator (C-2)) may be contained.
- a water-insoluble photopolymerization initiator (C-2) a known photopolymerization initiator can be used.
- the water-insoluble photopolymerization initiator (C-2) may be blended alone or in combination of two or more.
- Examples of the water-insoluble photopolymerization initiator (C-2) include (bis) acylphosphine oxides, thioxanthons, ketals, ⁇ -diketones, and coumarins other than the water-soluble photopolymerization initiator (C-1). Examples thereof include anthraquinones, benzoin alkyl ether compounds, and ⁇ -aminoketone compounds.
- examples of the acylphosphine oxides include 2,4,6-trimethylbenzoyldiphenylphosphine oxide, 2,6-dimethoxybenzoyldiphenylphosphine oxide, and 2,6-dichlorobenzoyldiphenylphosphine oxide.
- 2,4,6-trimethylbenzoylmethoxyphenylphosphine oxide, 2,4,6-trimethylbenzoylethoxyphenylphosphine oxide, 2,3,5,6-tetramethylbenzoyldiphenylphosphine oxide, benzoyldi (2,6-dimethylphenyl) Phosphate and the like can be mentioned.
- bisacylphosphine oxides include bis (2,6-dichlorobenzoyl) phenylphosphine oxide, bis (2,6-dichlorobenzoyl) -2,5-dimethylphenylphosphine oxide, and bis (2,6-dichlorobenzoyl)-.
- thioxanthones examples include thioxanthone and 2-chlorothioxanthene-9-one.
- ketals examples include benzyldimethyl ketal, benzyldiethyl ketal and the like.
- ⁇ -diketones examples include diacetyl, benzyl, dl-camphorquinone, 2,3-pentadione, 2,3-octadione, 9,10-phenanthrenequinone, 4,4'-oxybenzyl, acenaphthenicinone and the like. Can be mentioned. Among these, dl-camphorquinone is particularly preferable from the viewpoint of having a maximum absorption wavelength in the visible light region.
- Examples of the coumarin compound include 3,3'-carbonylbis (7-diethylaminocoumarin), 3- (4-methoxybenzoyl) coumarin, 3-thienoyl coumarin, 3-benzoyl-5,7-dimethoxycoumarin, 3 -Benzoyle-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 preferable.
- anthraquinones examples include anthraquinone, 1-chloroanthraquinone, 2-chloroanthraquinone, 1-bromoanthraquinone, 1,2-benz anthraquinone, 1-methylanthraquinone, 2-ethylanthraquinone, 1-hydroxyanthraquinone and the like. ..
- benzoin alkyl ether compound examples include benzoin methyl ether, benzoin ethyl ether, benzoin isopropyl ether, and benzoin isobutyl ether.
- Examples of the ⁇ -aminoketone compound include 2-methyl-1- [4- (methylthio) phenyl] -2-morpholinopropane-1-one.
- water-insoluble photopolymerization initiators (C-2) it is preferable to use at least one selected from the group consisting of (bis) acylphosphine oxides, ⁇ -diketones, and coumarin compounds.
- a dental composition having excellent photocurability in the visible and near-ultraviolet regions and exhibiting sufficient photocurability using any light source such as a halogen lamp, a light emitting diode (LED), or a xenon lamp can be obtained.
- the content of the water-insoluble photopolymerization initiator (C-2) is not particularly limited, but the content of the water-insoluble photopolymerization initiator (C-2) is determined from the viewpoint of curability of the obtained composition.
- the range of 0.01 to 10 parts by mass is preferable, and the range of 0.05 to 7 parts by mass is more preferable with respect to a total of 100 parts by mass of the compound (A) and the monomer (B) in the dental composition. , 0.1 to 5 parts by mass is more preferable. If the content of the water-insoluble photopolymerization initiator (C-2) exceeds 10 parts by mass, sufficient adhesive strength may not be obtained if the polymerization performance of the polymerization initiator itself is low. In addition, it may lead to precipitation from the dental composition.
- the mass ratio [(C-1) :( C-2)] of the water-soluble photopolymerization initiator (C-1) and the water-insoluble photopolymerization initiator (C-2) in the present invention is preferably 10: 1. It is ⁇ 1:10, more preferably 7: 1 to 1: 7, still more preferably 5: 1 to 1: 5, and particularly preferably 3: 1 to 1: 3. If a water-soluble photopolymerization initiator (C-1) is blended in a mass ratio of more than 10: 1, the curability of the dental composition itself may decrease, making it difficult to develop high adhesive strength. be.
- the dental composition of the present invention can further contain a chemical polymerization initiator, and an organic peroxide is preferably used.
- the organic peroxide used for the above-mentioned chemical polymerization initiator is not particularly limited, and known ones can be used.
- Typical 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. 2008/08977.
- the dental composition of the present invention may further contain a filler (D).
- the filler (D) is roughly classified into an organic filler, an inorganic filler and an organic-inorganic composite filler.
- Examples of the material of the organic filler include polymethyl methacrylate, ethyl polymethacrylate, methyl methacrylate-ethyl methacrylate copolymer, cross-linked polymethyl methacrylate, cross-linked polyethyl methacrylate, polyamide, polyvinyl chloride, and polystyrene. , Chloroprene rubber, nitrile rubber, ethylene-vinyl acetate copolymer, styrene-butadiene copolymer, acrylic nitrile-styrene copolymer, acrylic nitrile-styrene-butadiene copolymer, etc., and these are used alone. It may be used as a mixture of two or more kinds.
- the shape of the organic filler is not particularly limited, and the particle size of the filler can be appropriately selected and used.
- Materials for inorganic fillers include quartz, silica, alumina, silica-titania, silica-titania-barium oxide, silica-zirconia, silica-alumina, lanthanum glass, borosilicate glass, soda glass, barium glass, strontium glass, and glass ceramic.
- the shape of the inorganic filler is not particularly limited, and the particle size of the filler can be appropriately selected and used.
- the average particle size of the inorganic filler is preferably 0.001 to 50 ⁇ m, more preferably 0.001 to 10 ⁇ m, and 0.001. It is more preferably ⁇ 8 ⁇ m.
- the average particle size of the inorganic filler means the average particle size before the surface treatment.
- Examples of the shape of the inorganic filler include an amorphous filler and a spherical filler. From the viewpoint of improving the mechanical strength of the composition, it is preferable to use a spherical filler as the inorganic filler. Further, when the spherical filler is used, there is an advantage that a composite resin having excellent surface smoothness can be obtained when the dental composition of the present invention is used as a self-adhesive dental composite resin.
- the spherical filler used in the present invention is a spherical filler in which a photograph of the filler is taken with an electron microscope, the particles observed in the unit field of view are rounded, and the particle size in the direction orthogonal to the maximum diameter is divided by the maximum diameter. It is a filler having an average uniformity of 0.6 or more.
- the average particle size of the spherical filler is preferably 0.05 to 5 ⁇ m. If the average particle size is less than 0.05 ⁇ m, the filling rate of the spherical filler in the composition may decrease, and the mechanical strength may decrease. On the other hand, if the average particle size exceeds 5 ⁇ m, the surface area of the spherical filler may decrease, and a cured product of a dental composition having high mechanical strength may not be obtained.
- the inorganic filler may be used after being surface-treated in advance with a known surface treatment agent such as a silane coupling agent, if necessary.
- a known surface treatment agent such as a silane coupling agent
- surface treatment agents include vinyltrimethoxysilane, vinyltriethoxysilane, vinyltrichlorosilane, vinyltri ( ⁇ -methoxyethoxy) silane, ⁇ -methacryloyloxypropyltrimethoxysilane, and 8-methacryloyloxyoctyltrimethoxysilane.
- Examples thereof include 11-methacryloyloxyundecyltrimethoxysilane, ⁇ -glycidoxypropyltrimethoxysilane, ⁇ -mercaptopropyltrimethoxysilane, and ⁇ -aminopropyltriethoxysilane.
- the organic-inorganic composite filler used in the present invention is obtained by adding a monomeric compound to the above-mentioned inorganic filler in advance, forming it into a paste, polymerizing it, and pulverizing it.
- a TMPT filler a mixture of trimethylolpropane methacrylate and a silica filler and then pulverized
- the shape of the organic-inorganic composite filler is not particularly limited, and the particle size of the filler can be appropriately selected and used. From the viewpoint of handleability 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 determined by a laser diffraction / scattering method or electron microscopic observation of particles.
- the laser diffraction / scattering method is convenient for measuring the particle size of particles 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 the laser diffraction / scattering method.
- the laser diffraction / scattering method is specifically measured by a laser diffraction type particle size distribution measuring device (SALD-2300: manufactured by Shimadzu Corporation) using a 0.2% aqueous sodium hexametaphosphate solution as a dispersion medium on a volume basis. be able to.
- SALD-2300 manufactured by Shimadzu Corporation
- an electron microscope (S-4000 type, manufactured by Hitachi, Ltd.) of particles is taken, and the particle size of the particles (200 or more) observed in the unit field of view of the photograph is determined.
- It can be obtained by measuring using an image analysis type particle size distribution measurement software (Mac-View (Mount Tech Co., Ltd.)).
- the particle size is obtained as an arithmetic mean value of the longest length and the shortest length of the particles, and the average primary particle size is calculated from the number of particles and the particle size.
- filler (D) used in the present invention two or more kinds of fillers having different materials, particle size distributions, and forms may be mixed or used in combination, and the effect of the present invention may not be impaired. , Unintentionally, particles other than the filler may be contained as impurities.
- the content of the filler (D) used in the present invention is not particularly limited, and the filler (D) is added from 0 to 0 to 100 parts by mass in total of the compound (A) and the monomer (B) in the dental composition. It is preferable to contain 2000 parts by mass.
- the content of the filler (D) is preferably 50% by mass or more, preferably 55% by mass, based on the total amount of the dental composition, from the viewpoint of being superior to the effect of the present invention such as mechanical strength. It is more preferably present, and even more preferably 60% by mass.
- the content of the filler (D) is preferably 98% by mass or less, more preferably 94% by mass or less, and more preferably 88% by mass, based on the effect of the present invention such as mechanical strength. % Or less is more preferable. Since the suitable content of the filler (D) varies greatly depending on the embodiment used, the filler according to each embodiment is described together with the description of specific embodiments of the dental composition of the present invention described later. The suitable content of D) is shown.
- a polymerization accelerator (E) is used with the water-insoluble photopolymerization initiator (C-2) and / or the chemical polymerization initiator.
- the polymerization accelerator (E) used in the present invention include amines, sulfinic acid and salts thereof, borate compounds, barbituric acid derivatives, triazine compounds, copper compounds, tin compounds, vanadium compounds, halogen compounds and aldehydes. , Thiol compounds, sulfites, bisulfites, thiourea compounds and the like.
- the amines used as the polymerization accelerator (E) are divided into aliphatic amines and aromatic amines.
- the aliphatic amine include primary aliphatic amines such as n-butylamine, n-hexylamine and n-octylamine; and secondary aliphatic amines such as diisopropylamine, dibutylamine and N-methylethanolamine; N-Methyldiethanolamine, N-ethyldiethanolamine, Nn-butyldiethanolamine, N-lauryldiethanolamine, 2- (dimethylamino) ethylmethacrylate, N-methyldiethanolaminedimethacrylate, N-ethyldiethanolaminedimethacrylate, triethanolamine monomethacrylate , Triethanolamine dimethacrylate, triethanolamine trimethacrylate, triethanolamine, trimethylamine, triethylamine, tributylamine and other terti
- aromatic amine examples include N, N-bis (2-hydroxyethyl) -3,5-dimethylaniline, N, N-bis (2-hydroxyethyl) -p-toluidine, and 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-die
- sulfinic acid and its salts borate compounds, barbituric acid derivatives, triazine compounds, copper compounds, tin compounds, vanadium compounds, halogen compounds, aldehydes, thiol compounds, sulfites, hydrogen sulfites, and thiourea compounds. Is described in International Publication No. 2008/08977.
- the above-mentioned polymerization accelerator (E) may be blended alone or in combination of two or more.
- the content of the polymerization accelerator (E) used in the present invention is not particularly limited, but from the viewpoint of curability of the obtained dental composition and the like, the compound (A) and the monomer (B) in the dental composition ), 0.001 part by mass or more is preferable, 0.01 part by mass or more is more preferable, 0.1 part by mass or more is further preferable, and 30 parts by mass or less is preferable, and 10 parts by mass is preferable with respect to 100 parts by mass in total. It is more preferably parts or less, and even more preferably 5 parts by mass or less.
- the content of the polymerization accelerator (E) is less than 0.001 part by mass, the polymerization does not proceed sufficiently, which may lead to a decrease in adhesiveness, and more preferably 0.05 part by mass or more.
- the content of the polymerization accelerator (E) exceeds 30 parts by mass, or if the polymerization performance of the polymerization initiator itself is low, sufficient adhesiveness may not be obtained, and further, a dental composition. More preferably, it is 20 parts by mass or less because it may cause precipitation from.
- the dental composition of the present invention may further contain a fluorine ion-releasing substance.
- a fluorine ion-releasing substance By blending a fluorine ion-releasing substance, a dental composition capable of imparting acid resistance to the dentin can be obtained.
- a fluorine ion-releasing substance include metal fluorides such as sodium fluoride, potassium fluoride, sodium monofluorophosphate, lithium fluoride, and itterbium fluoride.
- the above-mentioned fluorine ion-releasing substance may be blended alone or in combination of two or more.
- dental compositions include pH adjusters, polymerization inhibitors, thickeners, colorants, fluorescent agents, fragrances, and cross-linking agents (for example, polyvalent metal ion emitting components) as long as the effects of the present invention are not impaired. ) And other additives may be added. As the additive, one type may be used alone, or two or more types may be used in combination.
- the dental composition of the present invention includes cetylpyridinium chloride, benzalkonium chloride, (meth) acryloyloxide decylpyridinium bromide, (meth) acryloyloxyhexadecylpyridinium chloride, (meth) acryloyloxydecylammonium chloride, triclosan and the like. It may contain an antibacterial substance of.
- the dental composition of the present invention may contain known dyes and pigments as colorants.
- the dental composition of the present invention may contain a solvent depending on the intended use.
- the solvent include water, an organic solvent and the like.
- organic solvent known organic solvents can be used without any limitation, and alcohol solvents (methanol, ethanol, 1-propanol, 2-propanol, etc.), acetone, methyl ethyl ketone, tetrahydrofuran, diethyl ether, diisopropyl ether, hexane, toluene, chloroform, etc. can be used.
- alcohol solvents methanol, ethanol, 1-propanol, 2-propanol, etc.
- acetone methyl ethyl ketone
- tetrahydrofuran diethyl ether
- diisopropyl ether hexane
- toluene chloroform, etc.
- the content of the organic solvent is preferably 1 to 2000 parts by mass, preferably 2 to 1000 parts by mass, based on 100 parts by mass of the total of the compound (A) and the monomer (B). More preferably, 3 to 500 parts by mass is further preferable.
- the dental composition of the present invention when used as a self-adhesive dental composite resin, a dental composite resin, a dental cement, or the like, it may be a dental composition containing no solvent.
- a small amount of water or an organic solvent may be mixed (for example, 3% by mass or less with respect to the composition) as long as it does not cause inconvenience such as poor curing or delayed curing.
- ingredients to be blended are sold in the form of containing water or an organic solvent (for example, colloidal silica), but in such a case, the water or the organic solvent should be removed to the allowable limit. It is used for preparing the dental composition of the present invention.
- an organic solvent for example, colloidal silica
- the dental composition of the present invention is other than the compound (A), the monomer (B), the polymerization initiator (C), the filler (D), the polymerization accelerator (E), the polymerization inhibitor, and the colorant.
- the component of (for example, a prepolymer (oligomer) different from the compound (A)) is preferably less than 0.1 part by mass and less than 0.01 part by mass in 100 parts by mass of the dental composition. More preferably, it is more preferably less than 0.001 part by mass.
- the dental composition of the present invention preferably has a polymerization shrinkage stress of less than 10 MPa, more preferably less than 9.5 MPa, and even more preferably less than 9.0 MPa. The method for measuring the polymerization shrinkage stress is as described in Examples described later.
- the dental composition of the present invention is, for example, a dental composite resin (particularly preferably a self-adhesive dental composite resin), a dental bonding material, a dental cement, a pit fissure filling material, and a swaying tooth fixing material.
- a dental composite resin particularly preferably a self-adhesive dental composite resin
- a dental bonding material e.g. a dental cement
- a pit fissure filling material e.g., a pit fissure filling material
- a swaying tooth fixing material e.g., a dental cement
- Abutment construction materials, orthodontic bonding materials and the like can be used for dental treatment, and among them, it is preferably used as a self-adhesive dental composite resin, a dental composite resin, or a dental cement.
- the components of the dental composition of the present invention may be used as a two-bottle type or a two-paste type divided into two, or may be a one-bot
- the dental composition of the present invention is a self-adhesive dental composite resin.
- the self-adhesive dental composite resin comprising the dental composition of the present invention contains a monomer (B-1) having an acidic group.
- the compound (A), the monomer (B), the polymerization initiator (C), the filler (D) and the polymerization accelerator (E) are used.
- the polymerization initiator (C) is preferably a photopolymerization initiator, and the polymerization initiator (C) contains a water-soluble photopolymerization initiator (C-1) and a water-insoluble photopolymerization initiator (C-2). Is more preferable.
- a pretreatment material may be used, but the pretreatment material is not essential because it has self-adhesiveness, and a pretreatment material is used. It does not have to be. It can be a self-adhesive dental composite resin containing only the dental composition of the present invention without containing a pretreatment material.
- the content of each component in the self-adhesive dental composite resin is 0.1 to 50 mass by mass of the compound (A) with respect to 100 parts by mass of the total of the compound (A) and the monomer (B) in the dental composition.
- 0.001 to 30 parts by mass of the polymerization initiator (C), 50 to 2000 parts by mass of the filler (D) and the polymerization accelerator ( E) preferably contains 0.001 to 20 parts by mass, preferably 0.05 to 10 parts by mass of the polymerization initiator (C), 100 to 1500 parts by mass of the filler (D), and 0.05 to 10 parts by mass of the polymerization accelerator (E). It is more preferable to include parts by mass.
- the dental composition used as the self-adhesive dental composite resin may not contain the hydrophilic monomer (B-3).
- the dental composite resin comprising the dental composition of the present invention does not contain a monomer (B-1) having an acidic group.
- the compound (A), the hydrophobic monomer (B-2) having no acidic group, and the hydrophilic monomer having no acidic group (B-2) It is preferable to contain B-3), a polymerization initiator (C), a filler (D) and a polymerization accelerator (E).
- the content of each component in the dental composite resin is 0.1 to 50 parts by mass of the compound (A) and acidic with respect to 100 parts by mass of the total of the compound (A) and the monomer (B) in the dental composition. It is preferable to contain 50 to 99 parts by mass of a hydrophobic monomer (B-2) having no group and 0 to 40 parts by mass of a hydrophilic monomer (B-3) having no acidic group, and the compound (A). 0.5 to 40 parts by mass, 60 to 99 parts by mass of the hydrophobic monomer (B-2) having no acidic group, and 0 to 30 parts by mass of the hydrophilic monomer (B-3) having no acidic group.
- 0.001 to 30 parts by mass of the polymerization initiator (C), 50 to 2000 parts by mass of the filler (D) and the polymerization accelerator ( E) preferably contains 0.001 to 20 parts by mass, preferably 0.05 to 10 parts by mass of the polymerization initiator (C), 100 to 1500 parts by mass of the filler (D), and 0.05 to 10 parts by mass of the polymerization accelerator (E). It is more preferable to include parts by mass.
- the dental composition used as a dental composite resin does not have to contain a hydrophilic monomer (B-3).
- dental cement One of the other preferred embodiments of the dental composition of the present invention is dental cement.
- resin cement, glass ionomer cement, resin reinforced glass ionomer cement and the like are exemplified as suitable ones.
- a self-etching primer or the like may be used as a pretreatment material.
- the dental composition of the present invention when used as a dental cement, it contains a compound (A), a monomer (B), a polymerization initiator (C), a filler (D) and a polymerization accelerator (E), and a single amount thereof is contained.
- the body (B) has an acidic group-containing monomer (B-1), an acidic group-free hydrophobic monomer (B-2), and an acidic group-free hydrophilic monomer (B-3). ) Is preferably included.
- the polymerization initiator (C) preferably contains a chemical polymerization initiator, and it is more preferable to use the chemical polymerization initiator and the photopolymerization initiator in combination.
- the photopolymerization initiator it is preferable to use a water-soluble photopolymerization initiator (C-1) and a water-insoluble photopolymerization initiator (C-2) in combination.
- each component in the dental cement is 0.1 to 50 parts by mass of the compound (A) and an acidic group with respect to a total of 100 parts by mass of the compound (A) and the monomer (B) in the dental composition.
- 0.001 to 30 parts by mass of the polymerization initiator (C), 50 to 2000 parts by mass of the filler (D) and the polymerization accelerator ( E) preferably contains 0.001 to 20 parts by mass, preferably 0.05 to 10 parts by mass of the polymerization initiator (C), 100 to 1500 parts by mass of the filler (D), and 0.05 to 10 parts by mass of the polymerization accelerator (E). It is more preferable to include parts by mass.
- the dental composition used as dental cement may not contain the hydrophilic monomer (B-3). In the case of a type of dental cement using a pretreatment material, the dental composition may not contain a monomer (B-1) having an acidic group.
- the content of each component can be appropriately changed based on the description in the above specification. Any component can be added, deleted, or changed.
- the present invention includes embodiments in which the above configurations are variously combined within the scope of the technical idea of the present invention as long as the effects of the present invention are exhibited.
- UN-2600 Urethane acrylate (manufactured by Negami Kogyo Co., Ltd., viscosity: 75,000 to 90,000 cps / 25 ° C, weight average molecular weight (Mw): 2,500, glass transition temperature (Tg): -1 ° C, polymerizable Number of groups (acrylic groups): 2, weight average molecular weight per acrylic group: 1,250, acetone solubility: 50 g / L or more)
- Inorganic filler 1 Fine particle silica "Aerosil (registered trademark) R 972" manufactured by Nippon Aerosil Co., Ltd., average particle size: 16 nm, refractive index: 1.46
- Inorganic filler 2 Silane-treated silica stone powder, refractive index: 1.55 Silica stone powder (quartz, manufactured by Nitchitsu Co., Ltd., trade name "High Silica”) was pulverized with a ball mill to obtain pulverized silica stone powder.
- the average particle size of the obtained crushed silica stone powder was measured on a volume basis using a laser diffraction type particle size distribution measuring device (manufactured by Shimadzu Corporation, model "SALD-2300") and found to be 2.2 ⁇ m. 100 parts by mass of this crushed silica stone powder was surface-treated with 4 parts by mass of ⁇ -methacryloyloxypropyltrimethoxysilane by a conventional method to obtain a silane-treated silica stone powder.
- a dental LED light irradiator (manufactured by Morita Co., Ltd., trade name "Alphalight V”) was used to irradiate the slide glass with three spectra on the front and back sides to cure the glass slide, to obtain a cured product. From the obtained cured product immediately after curing, 2.3 to 2.5 mg was cut off with a razor to obtain a measurement sample.
- the obtained cured product was subjected to a bending test using a universal testing machine (Autograph AG-I 100 kN, manufactured by Shimadzu Corporation) with a distance between fulcrums of 20 mm and a crosshead speed of 1 mm / min, and a 3-point bending strength.
- the self-adhesive dental composite resin (Examples 1-1 to 1-9) according to the present invention has a bending strength of 82 MPa or more, which is practically sufficient for the cured product. And showed a low polymerization shrinkage stress of 8.5 MPa or less. Further, in the dental composite resin according to the present invention (Example 1-10), the cured product had a bending strength of 100 MPa and showed a low polymerization shrinkage stress of 6.6 MPa.
- a self-adhesive dental composite resin containing no compound (A) or containing a compound having a weight average molecular weight of 1,000 or more other than (A) (Comparative Examples 1-1 to 1).
- the polymerization shrinkage stress was 9.3 MPa or more.
- the self-adhesive dental composite resins that do not contain the compound (A) or contain a compound having a weight average molecular weight of 1,000 or more other than the compound (A) have polymerization shrinkage stresses, respectively.
- the reduction of the polymerization shrinkage stress was not sufficient in either case. From this result, the polymerization contraction stress is relaxed by containing the compound (A), and the risk of desorption and margin leakage is effectively reduced when repairing and treating a relatively deep cavity.
- the polymerization contraction stress is relaxed by containing the compound (A), and the risk of desorption and margin leakage is effectively reduced when repairing and treating a relatively deep cavity.
- the dental composition according to the present invention is suitably used as a dental composite resin, a self-adhesive dental composite resin, and a dental cement in the field of dentistry.
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Abstract
Description
[1]化合物(A)、25℃におけるアセトンへの溶解度が50g/L以上である単量体(B)、重合開始剤(C)を含み、
前記化合物(A)は、重量平均分子量が1,000~80,000であり、40℃未満のTgを含み、かつ25℃におけるアセトンへの溶解度が50g/L未満である、歯科用組成物;
[2]前記化合物(A)が重合性基を有する化合物を含む、[1]に記載の歯科用組成物;
[3]前記化合物(A)の含有量が、前記化合物(A)と前記単量体(B)との合計100質量部に対して、0.1~50質量部である、[1]又は[2]のいずれかに記載の歯科用組成物;
[4]前記重合性基を有する化合物が、ウレタン結合を有するウレタン化(メタ)アクリル化合物(A-1)を含む、[2]又は[3]に記載の歯科用組成物;
[5]前記化合物(A)が、25℃におけるアセトンへの溶解度が20g/L未満である、[1]~[4]のいずれかに記載の歯科用組成物;
[6]前記単量体(B)が酸性基を有する単量体(B-1)を含む、[1]~[5]のいずれかに記載の歯科用組成物;
[7]さらにフィラー(D)を含む、[1]~[6]のいずれかに記載の歯科用組成物;
[8]前記化合物(A)の重合性基1つ当たりの重量平均分子量が1,250以上20,000未満である、[2]~[7]のいずれかに記載の歯科用組成物;
[9][1]~[8]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;
[10][1]~[8]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;
[11][1]~[8]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;
を包含する。
本発明において、化合物(A)は重量平均分子量1,000~80,000かつ40℃未満のTgを含み、25℃におけるアセトンへの溶解度(以下、単に「アセトンへの溶解度」と称することがある。)が50g/L未満である。化合物(A)は、本発明の歯科用組成物において、低い重合収縮応力を付与するために用いられる。
ウレタン化(メタ)アクリル化合物(A-1)は、ウレタン結合に加えて、ポリエステル、ポリカーボネート、ポリウレタン、ポリエーテル、ポリ共役ジエン、及び水添ポリ共役ジエンからなる群から選ばれる構造(ポリマー骨格)を有する(メタ)アクリレートであることが好ましく、分子内に、分岐構造を有する炭素数4~18の脂肪族ジオール単位に由来する構造を有するポリエステル、ポリカーボネート、ポリウレタン、ポリエーテル、ポリ共役ジエン、及び水添ポリ共役ジエンからなる群より選ばれる少なくとも1種のポリオール部分、並びにウレタン結合を有する(メタ)アクリレートであることがより好ましい。これらは前記の構造であれば特に限定されないが、例えば、ポリエステルとしては、ジカルボン酸(フタル酸、イソフタル酸等の芳香族ジカルボン酸;マレイン酸等の不飽和脂肪族ジカルボン酸)と炭素数2~18の脂肪族ジオールの重合体、ジカルボン酸(アジピン酸、セバシン酸等の飽和脂肪族ジカルボン酸)と炭素数2~18の脂肪族ジオールの重合体、β-プロピオラクトンの重合体、γ-ブチロラクトンの重合体、δ-バレロラクトン重合体、ε-カプロラクトン重合体及びこれらの共重合体などが挙げられ、ジカルボン酸(フタル酸、イソフタル酸等の芳香族ジカルボン酸;マレイン酸等の不飽和脂肪族ジカルボン酸)と炭素数2~12の脂肪族ジオールの重合体、ジカルボン酸(アジピン酸、セバシン酸等の飽和脂肪族ジカルボン酸)と炭素数2~12の脂肪族ジオールの重合体が好ましい。ポリカーボネートとしては、炭素数2~18の脂肪族ジオールから誘導されるポリカーボネート、ビスフェノールAから誘導されるポリカーボネート、及び炭素数2~18の脂肪族ジオールとビスフェノールAから誘導されるポリカーボネートなどが挙げられ、炭素数2~12の脂肪族ジオールから誘導されるポリカーボネート、ビスフェノールAから誘導されるポリカーボネート、及び炭素数2~12の脂肪族ジオールとビスフェノールAから誘導されるポリカーボネートが好ましい。ポリウレタンとしては、炭素数2~18の脂肪族ジオールと炭素数1~18のジイソシアネートの重合体などが挙げられ、炭素数2~12の脂肪族ジオールと炭素数1~12のジイソシアネートの重合体が好ましい。ポリエーテルとしては、ポリエチレングリコール、ポリプロピレングリコール、ポリブチレングリコール、ポリ(1-メチルブチレングリコール)などが挙げられる。ポリ共役ジエン及び水添ポリ共役ジエンとしては、1,4-ポリブタジエン、1,2-ポリブタジエン、ポリイソプレン、ポリ(ブタジエン-イソプレン)、ポリ(ブタジエン-スチレン)、ポリ(イソプレン-スチレン)、ポリファルネセン、及びこれらの水添物が挙げられる。これらの中でも、柔軟性、耐水性に優れる点で、ポリエステル、ポリカーボネート及びポリ共役ジエンの構造が好ましい。ウレタン化(メタ)アクリル化合物(A-1)の製造には、前記したポリマー骨格を有するポリオールを用いることができる。
ウレタン骨格を有さない(メタ)アクリル化合物(A-2)は、ポリエステル、ポリカーボネート、ポリウレタン、ポリエーテル、ポリ共役ジエン、及び水添ポリ共役ジエンからなる群から選ばれる構造(ポリマー骨格)を有する。これらは前記の構造であれば特に限定されないが、例えば、ポリエステルとしては、フタル酸と炭素数2~12のアルキレンジオールの重合体、アジピン酸と炭素数2~12のアルキレングリコールの重合体、マレイン酸と炭素数2~12のアルキレンジオールの重合体、β-プロピオラクトンの重合体、γ-ブチロラクトンの重合体、δ-バレロラクトン重合体、ε-カプロラクトン重合体及びこれらの共重合体などが挙げられる。ポリカーボネートとしては、炭素数2~12の脂肪族ジオールから誘導されるポリカーボネート、ビスフェノールAから誘導されるポリカーボネート、及び炭素数2~12の脂肪族ジオールとビスフェノールAから誘導されるポリカーボネートなどが挙げられる。ポリウレタンとしては、炭素数2~12の脂肪族ジオールと炭素数1~12のジイソシアネートの重合体などが挙げられる。ポリエーテルとしては、ポリエチレングリコール、ポリプロピレングリコール、ポリブチレングリコール、ポリ(1-メチルブチレングリコール)などが挙げられる。ポリ共役ジエン及び水添ポリ共役ジエンとしては、1,4-ポリブタジエン、1,2-ポリブタジエン、ポリイソプレン、ポリ(ブタジエン-イソプレン)、ポリ(ブタジエン-スチレン)、ポリ(イソプレン-スチレン)、ポリファルネセン、及びこれらの水添物が挙げられる。これらの中でも、柔軟性、耐水性に優れる点で、ポリエステル、ポリカーボネート及びポリ共役ジエンの構造が好ましい。ウレタン骨格を有さない(メタ)アクリル化合物(A-2)の製造には、前記したポリマー骨格を有するポリオールを用いることができる。ポリエステル、ポリカーボネート、ポリウレタン、ポリエーテル、ポリ共役ジエン、及び水添ポリ共役ジエンからなる群から選ばれる構造(ポリマー骨格)の骨格や分子量を調整することで、ウレタン骨格を有さない(メタ)アクリル化合物(A-2)のガラス転移温度とアセトン溶解性を調整できる。
重合性基を有さない重量平均分子量1,000以上の化合物は、ウレタン骨格を有し、重合性基を有さない重量平均分子量1,000以上の化合物(A-3)(以下、「化合物(A-3)」と称することがある。)と、ウレタン骨格及び重合性基を有さない重量平均分子量1,000以上の化合物(A-4)(以下、「化合物(A-4)」と称することがある。)の2種類に分類でき、化合物(A-3)が好ましい。ある実施形態では、化合物(A)、単量体(B)、及び重合開始剤(C)を含み、化合物(A-3)及び/又は化合物(A-4)を含まない、歯科用組成物が挙げられる。
SP値=(CED値)1/2=(E/V)1/2 式(A)
前記式(A)において、Eは凝集エネルギー(cal/mol)であり、Vはモル分子容(cm3/mol)である。
また、別の他の実施形態としては、化合物(A)、25℃におけるアセトンへの溶解度が50g/L以上である単量体(B)、重合開始剤(C)を含み、
前記化合物(A)は、重量平均分子量が1,000~80,000であり、40℃未満のTgを含み、かつ25℃におけるアセトンへの溶解度が50g/L未満であり、
40℃未満のTgを含み、25℃におけるアセトンへの溶解度が50g/L以上であり、かつ重量平均分子量2,000以上の化合物(例えば、(メタ)アクリル化合物等)を含まない、歯科用組成物が挙げられる。
前記化合物(A)は、重量平均分子量が1,000~80,000であり、40℃未満のTgを含み、かつ25℃におけるアセトンへの溶解度が50g/L未満であり、
2つ以上のガラス転移温度を有さず、かつ重量平均分子量2,000以上の化合物(例えば、(メタ)アクリル化合物等)を含まない、歯科用組成物が挙げられる。
別の他の実施形態としては、化合物(A)、25℃におけるアセトンへの溶解度が50g/L以上である単量体(B)、重合開始剤(C)を含み、
前記化合物(A)は、重量平均分子量が1,000~80,000であり、40℃未満のTgを含み、かつ25℃におけるアセトンへの溶解度が50g/L未満であり、
2つ以上のガラス転移温度を有さず、重量平均分子量5,000~50,000であり、かつ(メタ)アクリル基1つ当たりの重量平均分子量が1,250以上20,000未満であ(メタ)アクリル化合物を含まない、歯科用組成物が挙げられる。
単量体(B)としては、アセトンへの溶解度が高いものが用いられ、具体的には、25℃におけるアセトンへの溶解度が50g/L以上であり、75g/L以上であることが好ましく、90g/L以上であることがより好ましい。単量体(B)は、1種を単独で使用してもよく、2種以上を併用してもよい。単量体(B)としては、酸性基を有する単量体(B-1)、酸性基を有しない疎水性単量体(B-2)、酸性基を有しない親水性単量体(B-3)が挙げられる。単量体(B)を2種以上用いる場合は、それらの混合物のアセトンへの溶解度が高いもの(混合物の25℃におけるアセトンへの溶解度が50g/L以上)を用いればよい。
酸性基を有する単量体(B-1)は、酸エッチング効果及びプライマー処理効果を有しており、脱灰作用及び浸透作用を与える成分である。また、酸性基を有する単量体(B-1)は、重合可能であり、硬化作用も付与する。酸性基を有する単量体(B-1)を含有することにより、歯質に対する接着性と接着耐久性が向上する。
酸性基を有しない疎水性単量体(B-2)(以下、疎水性単量体(B-2)とする。)は、歯科用組成物の機械的強度、取り扱い性などを向上させる。疎水性単量体(B-2)は、酸性基を有さず、重合性基を有するラジカル単量体が好ましく、ラジカル重合が容易である観点から、重合性基は(メタ)アクリル基及び/又は(メタ)アクリルアミド基がより好ましい。疎水性単量体(B-2)とは、酸性基を有さず、かつ25℃における水に対する溶解度が10質量%未満の単量体を意味し、例えば、芳香族化合物系の二官能性単量体、脂肪族化合物系の二官能性単量体、三官能性以上の単量体などの架橋性の単量体が例示される。
本発明の歯科用組成物は、酸性基を有しない親水性単量体(B-3)(以下、親水性単量体(B-3)とする。)をさらに含むことが好ましい。親水性単量体(B-3)は、歯科用組成物の成分の歯質への浸透を促進するとともに、自らも歯質に浸透して歯質中の有機成分(コラーゲン)に接着する。親水性単量体(B-3)としては、酸性基を有さず、重合性基を有するラジカル単量体が好ましく、ラジカル重合が容易である観点から、重合性基は(メタ)アクリル基及び/又は(メタ)アクリルアミド基がより好ましい。親水性単量体(B-3)とは、酸性基を有さず、かつ25℃における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。親水性単量体(B-3)としては、水酸基、オキシメチレン基、オキシエチレン基、オキシプロプレン基、アミド基などの親水性基を有するものが好ましく、例えば、2-ヒドロキシエチル(メタ)アクリレート(HEMA)、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が9以上のもの)などの親水性の単官能性(メタ)アクリレート系単量体;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)アクリルアミド系単量体などが挙げられる。
重合開始剤(C)は大きく光重合開始剤と化学重合開始剤に分類され、さらに光重合開始剤は水溶性光重合開始剤(C-1)と非水溶性光重合開始剤(C-2)に分類される。重合開始剤(C)としては、水溶性光重合開始剤(C-1)のみを用いてもよく、非水溶性光重合開始剤(C-2)のみを用いてもよく、水溶性光重合開始剤(C-1)と非水溶性光重合開始剤(C-2)を併用してもよい。
水溶性光重合開始剤(C-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(C-1)は、25℃の水への溶解度が1.0質量%以上であり、1.5質量%以上であることが好ましく、2.0質量%以上であることがより好ましく、2.5質量%以上であることがさらに好ましい。同溶解度が1.0質量%未満の場合は、接着界面部において水溶性光重合開始剤(C-1)が歯質中の水に十分に溶解せず、接着界面での重合が促進しにくくなる。
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(C-1)以外に25℃の水への溶解度が1.0質量%未満である非水溶性光重合開始剤(C-2)(以下、非水溶性光重合開始剤(C-2)とする。)を含んでいてもよい。本発明に用いられる非水溶性光重合開始剤(C-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(C-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、さらに化学重合開始剤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。
本発明の歯科用組成物は、さらにフィラー(D)を含んでいてもよい。本発明において、フィラー(D)としては、有機フィラー、無機フィラー及び有機-無機複合フィラーに大別される。
ある実施形態では、非水溶性光重合開始剤(C-2)及び/又は化学重合開始剤とともに重合促進剤(E)が用いられる。本発明に用いられる重合促進剤(E)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、バルビツール酸誘導体、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。
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んでいてもよい。フッ素イオン放出性物質を配合することによって、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からなる自己接着性歯科用コンポジットレジンは、酸性基を有する単量体(B-1)を含む。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、化合物(A)、単量体(B)、重合開始剤(C)、フィラー(D)及び重合促進剤(E)を含み、単量体(B)が酸性基を有する単量体(B-1)、酸性基を有さない疎水性単量体(B-2)、及び酸性基を有さない親水性単量体(B-3)を含むことが好ましい。また、重合開始剤(C)は光重合開始剤が好ましく、重合開始剤(C)が水溶性光重合開始剤(C-1)と非水溶性光重合開始剤(C-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が挙げられる。本発明の歯科用組成物からなる歯科用コンポジットレジンは、酸性基を有する単量体(B-1)を含まない。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、化合物(A)、酸性基を有さない疎水性単量体(B-2)、酸性基を有さない親水性単量体(B-3)、重合開始剤(C)、フィラー(D)及び重合促進剤(E)を含むことが好ましい。また、重合開始剤(C)は光重合開始剤を含むことが好ましく、重合開始剤(C)が水溶性光重合開始剤(C-1)と非水溶性光重合開始剤(C-2)を含むことがより好ましい。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、歯科用ボンディング材、もしくは前処理材の使用が必須となる。
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。歯科用セメントは、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セメントとして用いる場合、化合物(A)、単量体(B)、重合開始剤(C)、フィラー(D)及び重合促進剤(E)を含み、単量体(B)が酸性基を有する単量体(B-1)、酸性基を有さない疎水性単量体(B-2)、酸性基を有さない親水性単量体(B-3)を含むことが好ましい。また、重合開始剤(C)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(C-1)と非水溶性光重合開始剤(C-2)を併用することが好ましい。
UN-7600:ウレタンアクリレート(根上工業株式会社製、粘度:1,100,000cps/25℃、重量平均分子量(Mw):11,500、ガラス転移温度(Tg):-42℃及び44.6℃、ポリエステル骨格含有ウレタンアクリレート、重合性基(アクリル基)の数:2、重合性基1つ当たりの重量平均分子量:5,750、アセトン溶解性:10g/L未満)
UC-102M:ポリイソプレン(株式会社クラレ製、粘度:30,000cps(38℃)、重量平均分子量(Mw):17,000、ガラス転移温度(Tg):-60℃、重合性基(メタクリル基)の数:2、重合性基1つ当たりの重量平均分子量:8,500、アセトン溶解性:10g/L未満)
TE-2000:ウレタンメタクリレート(未水素添加)(日本曹達株式会社製、粘度:1,500,000cps/45℃、重量平均分子量(Mw):約2,000、ガラス転移温度:-9℃、ポリブタジエン骨格含有ウレタンメタクリレート、重合性基(メタクリル基)の数:1.7程度、重合性基1つ当たりの重量平均分子量:約1,250以上、アセトン溶解性:10g/L未満)
UN-2600:ウレタンアクリレート(根上工業株式会社製、粘度:75,000~90,000cps/25℃、重量平均分子量(Mw):2,500、ガラス転移温度(Tg):-1℃、重合性基(アクリル基)の数:2、アクリル基1つ当たりの重量平均分子量:1,250、アセトン溶解性:50g/L以上)
MDP:10-メタクリロイルオキシデシルジヒ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
DD:1,10-デカンジオ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
HEMA:2-ヒドロキシエチルメタクリレート
単量体(B)成分全体のアセトン溶解性は、表1、2に示す。
・水溶性光重合開始剤(C-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塩(下記式(3)で表される化合物)、平均粒径:5μm
CQ:dl-カンファーキノン
無機フィラー1:日本アエロジル株式会社製の微粒子シリカ「アエロジル(登録商標)R 972」、平均粒径:16nm、屈折率:1.46
無機フィラー2:シラン処理珪石粉、屈折率:1.55
珪石粉(石英、株式会社ニッチツ製、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径をレーザー回折式粒度分布測定装置(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。この粉砕珪石粉100質量部に対して、常法により4質量部のγ-メタクリロイルオキシプロピルトリメトキシシランで表面処理を行い、シラン処理珪石粉を得た。
DABE:4-(N,N-ジメチルアミノ)安息香酸エチル
BHT:2,6-ジ-t-ブチル-4-メチルフェノール(安定剤(重合禁止剤))
<実施例1-1~1-10及び比較例1-1~1-7>
前記した成分を用いて、表1、2に記載の各成分を常温下で混合及び混練することにより、実施例1-1~1-9の自己接着性歯科用コンポジットレジン、実施例1-10の歯科用コンポジットレジン、比較例1-1~1-5の自己接着性歯科用コンポジットレジン、及び比較例1-6~1-7の歯科用コンポジットレジンのペースト(組成物)をそれぞれ調製した。次いで、これらのペーストを用い、後述の方法に従って、重合収縮応力及び曲げ物性を測定した。表1、2に、各実施例及び比較例の歯科用コンポジットレジンの配合比(質量部)及び試験結果を示す。
上記した各化合物(A)、及びUN-2600を、CQ、及びDABEとともにヘキサンに溶解させて試料を得た。詳細には、各化合物(A)、及びUN-2600に対して各1質量%のCQ、DABEをヘキサンに溶解させた後、ヘキサンを留去し、試料を得た。得られた試料を2枚のスライドガラスの間に挟み、金属スペーサーを用いて、試料の厚さが500μmとなるように、該試料をスライドガラスで圧接した。次いで、歯科用LED光照射器(株式会社モリタ製、商品名「アルファライトV」)にてスライドガラスの表裏各3分光照射して硬化し、硬化物を得た。得られた硬化直後の硬化物から2.3~2.5mgをカミソリで切り落として測定試料を得た。該測定試料を熱流束型DSC測定装置(株式会社ネッチ ジャパン(NETZSCH Japan)製、商品名「DSC 214 Polyma」)の試料パンに充填し、当該熱流束型DSC測定装置にて、昇温前に-150℃で5分等温後、窒素ガス40mL/分の雰囲気下にて、昇温速度20℃/分で200℃まで昇温することによりガラス転移温度を測定した(n=3)。平均値をガラス転移温度とした。
サンプル0.5gをマグネチックスターラーが入った50 mL三角フラスコに秤量し、アセトン10mLを加えて室温で30分間撹拌した。目視で未溶解物がないかつ、溶液が透明なものを溶解したとした。溶解しないサンプルについては加える量を減らして0.1gまで繰り返し実施した。
50μmアルミナパウダーでサンドブラスト処理を施した5.0mm厚のガラス板上に、離型剤を塗布したステンレス製ワッシャー(内径5.3mm×0.8mm厚)を設置し、ワッシャー内に各実施例及び比較例の歯科用コンポジットレジンのペーストを充填した。次いで、余剰なペーストを除去し、別途サンドブラスト処理を施したステンレス製治具(φ5mm)とガラス板で歯科用コンポジットレジンのペーストを挟み込んだ。
ISO 4049:2009に準拠して曲げ試験により強度を評価した。具体的には以下のとおりである。歯科用コンポジットレジンのペーストをSUS製の金型(縦2mm×横25mm×厚さ2mm)に充填し、ペースト(歯科用組成物)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LED光照射器(株式会社モリタ製、「ペンキュアー2000」)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歯科用組成物を硬化させた。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/分で曲げ試験を実施し、3点曲げ強さ、曲げ弾性率を測定し(n=5)、平均値を算出した。
Claims (11)
- 化合物(A)、25℃におけるアセトンへの溶解度が50g/L以上である単量体(B)、重合開始剤(C)を含み、
前記化合物(A)は、重量平均分子量が1,000~80,000であり、40℃未満のTgを含み、かつ25℃におけるアセトンへの溶解度が50g/L未満である、歯科用組成物。 - 前記化合物(A)が重合性基を有する化合物を含む、請求項1に記載の歯科用組成物。
- 前記化合物(A)の含有量が、前記化合物(A)と前記単量体(B)との合計100質量部に対して、0.1~50質量部である、請求項1又は2のいずれか1項に記載の歯科用組成物。
- 前記重合性基を有する化合物が、ウレタン結合を有するウレタン化(メタ)アクリル化合物(A-1)を含む、請求項2又は3に記載の歯科用組成物。
- 前記化合物(A)が、25℃におけるアセトンへの溶解度が20g/L未満である、請求項1~4のいずれか1項に記載の歯科用組成物。
- 前記単量体(B)が酸性基を有する単量体(B-1)を含む、請求項1~5のいずれか1項に記載の歯科用組成物。
- さらにフィラー(D)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。
- 前記化合物(A)の重合性基1つ当たりの重量平均分子量が1,250以上20,000未満である、請求項2~7のいずれか1項に記載の歯科用組成物。
- 請求項1~8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1~8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1~8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。
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