Classifications

• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K6/00—Preparations for dentistry
  • A61K6/80—Preparations for artificial teeth, for filling teeth or for capping teeth
  • A61K6/884—Preparations for artificial teeth, for filling teeth or for capping teeth comprising natural or synthetic resins
  • A61K6/887—Compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
  • A61K6/889—Polycarboxylate cements; Glass ionomer cements
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K6/00—Preparations for dentistry
  • A61K6/60—Preparations for dentistry comprising organic or organo-metallic additives
  • A61K6/62—Photochemical radical initiators
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K6/00—Preparations for dentistry
  • A61K6/60—Preparations for dentistry comprising organic or organo-metallic additives
  • A61K6/64—Thermal radical initiators
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K6/00—Preparations for dentistry
  • A61K6/70—Preparations for dentistry comprising inorganic additives
  • A61K6/71—Fillers

Definitions

• the present invention relates to a dental material capable of substituting a part or the whole of a natural tooth in the field of dentistry, particularly a dental restoration curable composition preferably used as a dental composite resin, and a dental restoration curable composition thereof. Concerning a dental mill blank consisting of a cured product.
• a curable composition for dental restoration composed of a polymerizable monomer, a filler and a polymerization initiator is called a dental composite resin and is most often used today as a material for repairing a tooth defect or caries. It is a dental material.
• Dental composite resins have sufficient mechanical strength to replace natural teeth, water resistance to withstand long-term oral restoration, and polishability to obtain the same luster as natural teeth in the cured product after polymerization curing. In the pasted state before polymerization and curing, it is required to have operability suitable for filling the tooth cavity using a dental instrument or the like.
• dental mill blanks are materials used for manufacturing dental prostheses such as inlays and crowns by a CAD / CAM system designed by a computer and cut by a milling device, and have been in demand in recent years. It is increasing rapidly.
• a dental mill blank a block body having an appropriate size and having a shape such as a rectangular parallelepiped, a cylinder, or a disc is supplied, and this is set in a cutting machine and machined to restore the crown shape and dentition shape. Get things.
• various materials such as glass ceramics, zirconia, titanium, acrylic resin, composite materials including polymer resin and inorganic filler have been proposed.
• Dental mill blanks are also required to have sufficient mechanical strength to replace natural teeth, water resistance to withstand long-term oral restoration, and polishability to obtain luster equivalent to that of natural teeth.
• Patent Document 2 a technique of combining a mono (meth) acrylamide compound and a (meth) acrylic acid ester compound has been proposed ( Patent Document 2).
• Patent Document 2 a technique of combining a mono (meth) acrylamide compound and a (meth) acrylic acid ester compound has been proposed ( Patent Document 2).
• this technique has a problem that the mechanical strength is low and the water resistance is also low.
• a dental mill blank for example, in order to realize mechanical strength and polishability, an inorganic filler is press-molded to obtain a molded product, and then a polymerizable monomer is immersed in the molded product and heated.
• a method for producing a dental mill blank to be polymerized is described (Patent Document 3). By this manufacturing method, nanoparticles can be packed at a high density, and a dental mill blank having excellent mechanical strength and polishability can be obtained.
• Patent Document 3 A method for producing a dental mill blank to be polymerized.
• nanoparticles can be packed at a high density, and a dental mill blank having excellent mechanical strength and polishability can be obtained.
• the viscosity of the polymerizable monomer is high and the molded product has a high viscosity. There was a problem that it did not penetrate. In addition, water resistance was not mentioned and there was room for improvement.
• the present invention has been made to solve the above-mentioned problems of the prior art, and is a curable composition for dental restoration, wherein the cured product has high mechanical strength and is excellent in water resistance and polishability. It is an object of the present invention to provide a dental composite resin composed of a curable composition for restoration and a dental mill blank composed of a cured product of the curable composition for dental restoration. Another object of the present invention is to provide a dental restoration curable composition having excellent paste operability and a dental composite resin composed of the dental restoration curable composition. Furthermore, an object of the present invention is to provide a dental mill blank which can suppress air bubbles generated in a cured product and has an excellent appearance.
• the present inventors have made a (meth) acrylic acid ester compound having two or more (meth) acryloyloxy groups in one molecule, and a specific mono (meth) acrylic.
• an acid ester compound an inorganic filler having an average primary particle size of 0.01-5 ⁇ m, and a polymerization initiator
• the cured product has surprisingly high mechanical strength, water resistance and polishability.
• the curable composition for dental restoration has excellent paste properties before curing, and based on the findings, further studies have been carried out to complete the present invention.
• the mono (meth) acrylic acid ester compound (B) containing an inorganic filler (C) of up to 5 ⁇ m and a polymerization initiator (D) is represented by the following general formula (I).
• the acid ester compound (B-1) and the mono (meth) acrylic acid ester compound (B-2) represented by the following general formula (II).
• R 1 and R 2 are independent groups represented by the following general formula (i) or groups represented by the general formula (ii), and X is a divalent group having 1 to 6 carbon atoms. It is a hydrocarbon group or an oxygen atom.
• R 3 and R 5 are independently divalent hydrocarbon groups having 1 to 10 carbon atoms, and R 4 and R 6 are independently hydrogen atoms or methyl groups, respectively, and k and l are Are independently integers from 0 to 6)
• a curable composition for dental restoration which comprises at least one selected from the group consisting of.
• the (meth) acrylic acid ester compound (A) contains a compound having no hydroxy group, carboxy group, primary amino group, secondary amino group, amide group, urea bond, and urethane bond, [1] to The curable composition for dental restoration according to any one of [8].
• the curable composition for dental restoration according to any one of [1] to [9] which has a heterocycle containing a nitrogen atom and substantially does not contain a compound having a polymerizable functional group.
• the cured product has high mechanical strength and is excellent in water resistance and abrasiveness. Moreover, the curable composition for dental restoration of the present invention is excellent in operability of the paste. Further, the curable composition for dental restoration of the present invention can suppress air bubbles generated in the cured product and is excellent in appearance.
• the curable composition for dental restoration of the present invention comprises a (meth) acrylic acid ester compound (A) having two or more (meth) acryloyloxy groups in one molecule, and a mono (meth) acrylic acid ester compound (B). ), An inorganic filler (C) having an average primary particle size of 0.01 to 5 ⁇ m, and a polymerization initiator (D).
• the mono (meth) acrylic acid ester compound (B) is represented by the mono (meth) acrylic acid ester compound (B-1) represented by the above general formula (I) and the above general formula (II). It is important to include at least one selected from the group consisting of the mono (meth) acrylic acid ester compound (B-2).
• the viscosity can be kept low, and the operability of the obtained curable composition for dental restoration is improved.
• the cured product showed high mechanical strength.
• the ⁇ - ⁇ interaction of the aromatic ring contained in the mono (meth) acrylic acid ester compound (B) strengthens the interaction between the polymer chains after polymerization and cures the compound. It is presumed that the mechanical strength of the object will improve. Further, by using the mono (meth) acrylic acid ester compound (B), the viscosity can be suppressed low, and the generation of bubbles in the cured product can be suppressed.
• the upper limit value and the lower limit value of the numerical range can be appropriately combined. Further, in the present specification, the numerical values of each symbol in the formula can be appropriately combined.
• the (meth) acrylic acid ester compound (A) having two or more (meth) acryloyloxy groups in one molecule is a cured product of the curable composition for dental restoration in the curable composition for dental restoration of the present invention. Is used to impart water resistance and mechanical strength.
• a (meth) acrylic acid ester compound (A) having two or more (meth) acryloyloxy groups in one molecule in the present invention (hereinafter, may be referred to as "(meth) acrylic acid ester compound (A)").
• the compound having a cyclic structure include a compound having an aromatic ring (A-1), a compound having an alicyclic ring (A-2), and a compound having a heterocycle (A-3).
• the (meth) acrylic acid ester compound (A) (for example, the compound having an aromatic ring (A-1), the compound having an alicyclic ring (A-2), and the compound having a heterocycle (A-3)) is 1
• the (meth) acryloyloxy group and other polymerizable functional groups are collectively referred to as "polymerizable functional group”.
• Examples of the polymerizable functional group of the (meth) acrylic acid ester compound (A) include those similar to those of the prepolymer described later, with a (meth) acryloyl group being preferred, and a (meth) acryloyloxy group being more preferred.
• the compound (A-3) having a heterocycle is also referred to as "a compound (A-3) having a heterocycle and having a polymerizable functional group”.
• there is a curable composition for dental restoration in which the polymerizable functional group of the (meth) acrylic acid ester compound (A) is only the (meth) acryloyloxy group.
• the polymerizable functional group of the compound having an aromatic ring (A-1) or the compound having an alicyclic ring (A-2) is only a (meth) acryloyloxy group, which is curable for dental restoration.
• the composition is mentioned.
• the (meth) acrylic acid ester compound (A) is aromatic in that the mechanical strength after curing can be further improved by interacting with the mono (meth) acrylic acid ester compound (B) described later. It is more preferable to contain a compound having a ring (A-1), and further preferably to contain a compound having a bisphenol A skeleton.
• the notation "(meth) acrylic” is used to include both methacrylic and acrylic. The same applies to expressions such as "(meth) acryloyl".
• Examples of the aromatic ring of the compound (A-1) having an aromatic ring include benzene, naphthalene, anthracene, biphenyl, benzophenone, phenyl ether, bisphenol A and the like, and the mono (meth) acrylic acid ester compound (B) and the like.
• Bisphenol A is preferable because the cured product is more excellent in mechanical strength and water resistance when combined.
• Examples of the compound (A-1) having an aromatic ring include 2,2-bis [4- [3-acryloyloxy-2-hydroxypropoxy] phenyl] propane and 2,2-bis [4- (3-methacryloyl).
• Oxy-2-hydroxypropoxy) phenyl] propane (commonly known as "Bis-GMA"), 2,2-bis [4- [2- (acryloyloxy) ethoxy] phenyl] propane, 2,2-bis [4- [2] -(Methacryloxy) ethoxy] phenyl] propane (commonly known as "Bis-MEPP”), 2,2-bis [4- (meth) acryloyloxypolyethoxyphenyl] propane (for example, the average number of moles of ethoxy group added 2.6 , 1,2-Bis [3- (meth) acryloyloxy-2-hydroxypropoxyphenyl] ethane, 9,9-bis [4- (2-acryloyloxyethoxy) phenyl] fluorene and the like.
• Examples of the alicyclic of the compound (A-2) having an alicyclic include cyclopentane, cyclohexane, cycloheptane, dicyclodecane, tricyclodecane, adamantane, isobornyl and the like.
• Examples of the compound (A-2) having an alicyclic include 1,4-cyclohexanedimethanol di (meth) acrylate, tricyclodecanedimethanol di (meth) acrylate, adamantyldi (meth) acrylate, and adamantane tiltli (meth). ) Acrylate and the like can be mentioned.
• heterocycle of the compound (A-3) having a heterocycle examples include a heterocycle containing only a nitrogen atom as a heteroatom such as triazine, carbazole, pyrodilin and piperidine; as a heteroatom such as tetrahydrofuran, oxane, dioxane and dioxolane.
• Heterocycle containing only oxygen atom Heterocycle containing oxygen atom and nitrogen atom as heteroatom such as morpholin; Heterocycle containing only sulfur atom as heteroatom such as tetrahydrothiophene and tetrahydrothiopyran, heteroatom such as thiazine and thiazole Examples thereof include a heterocycle containing a sulfur atom and a nitrogen atom.
• Examples of the compound (A-3) having a heterocycle include tri (meth) acrylate ethoxylated isocyanurate, ⁇ -caprolactone-modified tris (2- (meth) acryloyloxyethyl) isocyanurate, and hydroxypivalaldehyde-modified trimethylol.
• Propanedi (meth) acrylate and the like can be mentioned.
• a preferred embodiment includes a curable composition for dental restoration that has a heterocycle and is substantially free of compound (A-3) having a polymerizable functional group.
• Other preferred embodiments include curable compositions for dental restoration that have a heterocycle containing a nitrogen atom and are substantially free of compounds having a polymerizable functional group.
• the heterocycle containing a nitrogen atom includes a heterocycle containing only a nitrogen atom as the heteroatom, a heterocycle containing an oxygen atom and a nitrogen atom as the heteroatom, and a heterocycle containing a sulfur atom and a nitrogen atom as the heteroatom.
• “Substantially free of compounds having a heterocycle containing a nitrogen atom and having a polymerizable functional group” means the content of a compound having a heterocycle containing a nitrogen atom and having a polymerizable functional group.
• it is less than 0.1% by mass, preferably less than 0.05% by mass, more preferably less than 0.01% by mass, and further preferably less than 0% by mass.
• Substantially free of compound (A-3) having a heterocycle and having a polymerizable functional group also has a similar amount, and is a compound (A-) having a heterocycle and having a polymerizable functional group. It means that 3) is not included.
• the (meth) acrylic acid ester compound (A) preferably contains a compound having no hydrogen bond site from the viewpoint of being able to suppress a decrease in mechanical strength due to water absorption via hydrogen bonds and having higher water resistance.
• the (meth) acrylic acid ester compound (A) may specifically include a compound having a hydroxy group, a carboxy group, a primary amino group, a secondary amino group, an amide group, a urea bond, and a urethane bond.
• the compound having an aromatic ring (A-1) does not have a hydroxy group, a carboxy group, a primary amino group, a secondary amino group, an amide group, a urea bond, and a urethane bond.
• a curable composition for dental restoration containing a compound having an aromatic ring can be mentioned.
• the weight average molecular weight (Mw) of the (meth) acrylic acid ester compound (A) is preferably 500 to 50,000, more preferably 750 to 30,000, and more preferably 1,000 to 15,000 from the viewpoint of paste operability and mechanical strength after curing. Is even more preferable.
• the content of the (meth) acrylic acid ester compound (A) in the curable composition for dental restoration of the present invention is that of the (meth) acrylic acid ester compound (A) and the mono (meth) acrylic acid ester compound (B). It is preferably 10 to 99% by mass, more preferably 30 to 95% by mass, and 50 to 90% by mass, based on the total amount, which is excellent in mechanical strength, water resistance, and operability of the paste. Is more preferable.
• the mono (meth) acrylic acid ester compound (B) can reduce the viscosity of the curable composition for dental restoration in the curable composition for dental restoration of the present invention, impart excellent operability of a paste, and provide a cured product. Is used to impart high mechanical strength and water resistance to the paste.
• the mono (meth) acrylic acid ester compound (B) is a mono (meth) acrylic acid ester compound (B-1) represented by the above general formula (I) (hereinafter, “mono (meth) acrylic acid ester compound (B)”.
• the mono (meth) acrylic acid ester compound (B) is obtained because the skeleton represented by the general formula (I) and the skeleton represented by the general formula (II) are rigid and hydrophobic.
• the cured product of the curable composition has low water absorption and can suppress a decrease in mechanical strength.
• R 1 is a group represented by the general formula (i) or a group represented by the general formula (ii), and the obtained curable composition for dental restoration is excellent in curability.
• R 4 and R 6 are independently hydrogen atoms or methyl groups, respectively.
• R 3 and R 5 are independently divalent hydrocarbon groups having 1 to 10 carbon atoms.
• the hydrocarbon group preferably has 1 to 6 carbon atoms, more preferably 1 to 4 carbon atoms, because the paste of the obtained curable composition for dental restoration is easy to operate and has excellent mechanical strength after curing. It is preferable, and 1 to 3 carbon atoms are more preferable.
• hydrocarbon group examples include a linear or branched alkylene group having 1 to 10 carbon atoms; a cycloalkylene group having 3 to 10 carbon atoms; and a phenylene group.
• k and l are independently integers of 0 to 6, and k is 0 because the resulting curable composition for dental restoration has a low viscosity, the generation of bubbles in the cured product can be suppressed, and the curability is excellent.
• ⁇ 4 is preferable, 0 to 3 is more preferable, 0 to 2 is further preferable, and 0 or 1 is particularly preferable.
• l is preferably 0 to 4, more preferably 0 to 2, and even more preferably 0 or 1.
• Examples of the mono (meth) acrylic acid ester compound (B-1) include o-phenylphenol (meth) acrylate, m-phenylphenol (meth) acrylate, p-phenylphenol (meth) acrylate, and methoxylated-o-.
• ethoxylated-o-phenylphenol acrylate, ethoxylated-m-phenylphenol acrylate in that the obtained paste of the curable composition for dental restoration is easy to operate and has excellent mechanical strength after curing.
• Ethoxylation-p-phenylphenol acrylate, propoxylation-o-phenylphenol acrylate, propoxylation-m-phenylphenol acrylate, propoxylation-p-phenylphenol acrylate are more preferred, ethoxylation-o-phenylphenol acrylate, ethoxylation.
• -M-Phenylphenol acrylate and ethoxylated-p-phenylphenol acrylate are more preferable, ethoxylated-o-phenylphenol acrylate and ethoxylated-m-phenylphenol acrylate are particularly preferable, and ethoxylated-o-phenylphenol acrylate is the most preferable. preferable.
• X is a divalent hydrocarbon group or an oxygen atom having 1 to 6 carbon atoms, and the paste of the obtained curable composition for dental restoration is easy to operate and has a mechanical strength after curing. Oxygen atoms are preferred because of their superiority.
• R 2 is a group represented by the general formula (i) or a group represented by the general formula (ii), and the paste of the obtained curable composition for dental restoration has good operability and is after curing.
• R 4 and R 6 are independently hydrogen atoms or methyl groups from the viewpoint of excellent mechanical strength.
• R 3 and R 5 are independently divalent hydrocarbon groups having 1 to 10 carbon atoms.
• the hydrocarbon group preferably has 1 to 6 carbon atoms, more preferably 1 to 4 carbon atoms, because the paste of the obtained curable composition for dental restoration is easy to operate and has excellent mechanical strength after curing. It is preferable, and 1 to 3 carbon atoms are more preferable.
• Examples of the hydrocarbon group include a linear or branched alkylene group having 1 to 10 carbon atoms; a cycloalkylene group having 3 to 10 carbon atoms; and a phenylene group.
• k and l are independently integers of 0 to 6, and k is 0 to 4 because the paste of the obtained curable composition for dental restoration is easy to operate and has excellent mechanical strength after curing.
• the mono (meth) acrylic acid ester compound (B) comprises a mono (meth) acrylic acid ester compound (B-2) represented by the general formula (II) and is cured for dental restoration. Examples include sex compositions.
• the mono (meth) acrylic acid ester compound (B) comprises a mono (meth) acrylic acid ester compound (B-2) represented by the general formula (II), where X is Examples thereof include a curable composition for dental restoration, which is an oxygen atom and R 2 is a group represented by the general formula (i). Furthermore, in some other preferred embodiments, the mono (meth) acrylic acid ester compound (B) comprises a mono (meth) acrylic acid ester compound (B-2) represented by the general formula (II). Examples thereof include a curable composition for dental restoration in which X is an oxygen atom, R 2 is a group represented by the general formula (i), and k is 0 or 1.
• Examples of the mono (meth) acrylic acid ester compound (B-2) include o-phenoxybenzyl (meth) acrylate, m-phenoxybenzyl (meth) acrylate, p-phenoxybenzyl (meth) acrylate, and 2- (o-).
• o-phenoxybenzyl acrylate, m-phenoxybenzyl acrylate, p-phenoxybenzyl acrylate which have good operability of the obtained paste of the curable composition for dental restoration and excellent mechanical strength after curing.
• 2- (o-Phenoxyphenyl) ethyl acrylate, 2- (m-phenoxyphenyl) ethyl acrylate, 2- (p-phenoxyphenyl) ethyl acrylate are more preferable, o-phenoxybenzyl acrylate, m-phenoxybenzyl acrylate, p- Phenoxybenzyl acrylate is more preferable, o-phenoxybenzyl acrylate and m-phenoxybenzyl acrylate are particularly preferable, and m-phenoxybenzyl acrylate is most preferable.
• the content of the mono (meth) acrylic acid ester compound (B) in the curable composition for dental restoration of the present invention is the (meth) acrylic acid ester compound (A) and the mono (meth) acrylic acid ester compound (B). It is preferably 1.0 to 90% by mass, more preferably 5 to 80% by mass, still more preferably 10 to 70% by mass, based on the mechanical strength, water resistance, and operability of the paste.
• the polymerizable monomer contained in the curable composition for dental restoration of the present invention is substantially composed of only the (meth) acrylic acid ester compound (A) and the mono (meth) acrylic acid ester compound (B). You may.
• the fact that the polymerizable monomer is substantially composed of only the (meth) acrylic acid ester compound (A) and the mono (meth) acrylic acid ester compound (B) means that the (meth) acrylic acid ester compound (A)
• the content of the polymerizable monomer other than the mono (meth) acrylic acid ester compound (B) is 10.0 mass by mass with respect to the total amount of the polymerizable monomer contained in the curable composition for dental restoration. It means that it is less than%, preferably less than 5.0% by mass, more preferably less than 1.0% by mass, still more preferably less than 0.1% by mass, and particularly preferably 0.01. It means that it is less than% by mass.
• inorganic filler (C) As the inorganic filler (C) in the present invention, known inorganic particles used as a filler in the dental composite resin can be used as long as the effects of the present invention are exhibited.
• the inorganic particles include various types of glass (for example, silicon dioxide (quartz, quartz glass, silica gel, etc.), silicon dioxide as a main component and various heavy metals containing boron and / or aluminum), alumina, and various ceramics.
• diatomaceous soil kaolin, clay minerals (montmorillonite, etc.), active white clay, synthetic zeolite, mica, silica, calcium fluoride, itterbium fluoride, calcium phosphate, barium sulfate, zirconium dioxide (zirconia), titanium dioxide (titania), hydroxyapatite And so on.
• the inorganic filler one type may be used alone, or two or more types may be used in combination.
• the important physical properties desired for dental materials include transparency and X-ray contrast properties similar to those of natural teeth.
• transparency can be achieved by matching the refractive indexes of the polymer of the inorganic filler (C) and the polymerizable monomer as much as possible.
• the X-ray contrast property can be imparted by using an inorganic filler (oxide or the like) containing a heavy metal element such as zirconium, barium, titanium, lanthanum, or strontium as the inorganic filler (C).
• the refractive index of such an inorganic filler containing a heavy metal element is usually high and is in the range of 1.5 to 1.6.
• the (meth) acrylic acid ester compound (A) and the mono (meth) having two or more (meth) acryloyloxy groups in one molecule constituting the polymerizable monomer forming the polymer since the refractive index of the cured product of the acrylic acid ester compound (B) is usually in the range of 1.5 to 1.6, it is combined with such an inorganic filler having a high refractive index having X-ray contrast property. The difference in refractive index can be adjusted to be small, and the transparency of the obtained dental material can be improved.
• Examples of the inorganic filler having a high refractive index capable of imparting the above-mentioned X-ray contrast property include barium borosilicate glass (for example, “E-3000” manufactured by Esstech and “8235” and “8235” manufactured by Schott AG. GM27884 “,” GM39923 “, etc.), Strontium boroaluminosilicate glass (for example,” E-4000 “manufactured by Esstech,” G018-093 “,” GM32087 “manufactured by Schott AG, etc.), Lantern glass (eg, Schott AG).
• GM31684, etc. fluoroaluminosilicate glass (eg, Schott's "G018-091", “G018-117”, etc.), zirconia-containing glass (eg, Schott's "G018-310"). , “G018-159”, etc.), glass containing strontium (for example, “G018-163", “G018-093", “GM32087”, etc. manufactured by Schott AG), glass containing zinc oxide (for example, Schott AG). (G018-161), etc.), glass containing calcium (for example, “G018-309”, etc., manufactured by Schott AG) and the like.
• fluoroaluminosilicate glass eg, Schott's "G018-091", “G018-117", etc.
• zirconia-containing glass eg, Schott's "G018-310”
• strontium for example, "G018-163", “G018
• the shape of the inorganic filler (C) is not particularly limited, and various shapes such as crushed, plate-shaped, scaly, fibrous (short fibers, long fibers, etc.), needle-shaped, whiskers, and spherical shapes are used. be able to.
• the inorganic filler (C) may be a combination of different shapes among the above shapes as long as the requirements of the present invention are satisfied.
• the average primary particle size of the inorganic filler (C) in the present invention is 0.01 to 5 ⁇ m.
• the average primary particle size of the inorganic filler (C) is preferably 0.02 ⁇ m or more, more preferably 0.04 ⁇ m or more, and preferably 3 ⁇ m or less. It is more preferably 2 ⁇ m or less. If the average primary particle size is smaller than 0.01 ⁇ m, the mechanical strength is likely to be impaired, and if it is larger than 5 ⁇ m, the polishability may be impaired.
• the average primary particle size of the inorganic filler (C) can be determined by a laser diffraction / scattering method or an electron microscope observation of the particles. Specifically, the laser diffraction / scattering method is convenient for measuring the particle size of particles of 0.1 ⁇ m or more, and electron microscope observation is convenient for measuring the particle size of particles of less than 0.1 ⁇ m. The laser diffraction / scattering method may be used to determine whether or not the average primary particle size is 0.1 ⁇ m or more.
• a laser diffraction type particle size distribution measuring device for example, "SALD-2300" manufactured by Shimadzu Corporation
• SALD-2300 a laser diffraction type particle size distribution measuring device
• the average primary particle size can be obtained.
• a scanning electron microscope (SEM; for example, "SU3500H-800NA type” manufactured by Hitachi High-Technologies Co., Ltd.) image photograph is taken, and the particle observed in the unit field of view of the SEM image photograph.
• the average primary particle size can be obtained by measuring the particle size of (200 or more) using an image analysis type particle size distribution measurement software (“Macview” manufactured by Mountech Co., Ltd., etc.). At this time, the particle diameter of the particles is obtained as the equivalent circle diameter, which is the diameter of a circle having the same area as the area of the particles, and the average primary particle diameter is calculated from the number of particles and the particle diameter.
• the content of the inorganic filler (C) in the curable composition for dental restoration of the present invention is not particularly limited, but is preferably 50 to 95% by mass, preferably 55, based on the total amount of the curable composition for dental restoration. It is more preferably from 90% by mass, still more preferably from 60 to 85% by mass.
• the inorganic filler (C) in the present invention is preferably one that has been surface-treated in advance with a surface-treating agent.
• a surface-treating agent By using the surface-treated inorganic filler (C), the mechanical strength of the obtained curable composition for dental restoration after curing can be further improved.
• two or more kinds of inorganic fillers (C) are used, only one of them may be surface-treated, and all of them are surface-treated. There may be. In the latter case, the surface-treated inorganic fillers (C) may be mixed individually, or a plurality of inorganic fillers may be mixed in advance and surface-treated collectively.
• the surface treatment agent a known surface treatment agent can be used, and organic metal compounds such as an organic silicon compound, an organic titanium compound, an organic zirconium compound, and an organic aluminum compound, and a phosphoric acid group, a pyrophosphate group, and a thiophosphate group can be used.
• An acidic group-containing organic compound having at least one acidic group such as a group, a phosphonic acid group, a sulfonic acid group, and a carboxylic acid group can be used.
• the surface treatment layer may be a mixture of two or more kinds of surface treatment agents, or may be a surface treatment layer having a multi-layer structure in which a plurality of surface treatment layers are laminated.
• a known method can be used without particular limitation.
• organosilicon compound examples include compounds represented by R 7 n SiY (4-n) (in the formula, R 7 is a substituted or unsubstituted hydrocarbon group having 1 to 12 carbon atoms, and Y is It indicates an alkoxy group, an acetoxy group, a hydroxyl group, a halogen atom or a hydrogen atom having 1 to 4 carbon atoms, and n is an integer of 0 to 3, but when there are a plurality of R 7 and Y, they are the same or different. May be).
• R 7 n SiY (4-n) in the formula, R 7 is a substituted or unsubstituted hydrocarbon group having 1 to 12 carbon atoms, and Y is It indicates an alkoxy group, an acetoxy group, a hydroxyl group, a halogen atom or a hydrogen atom having 1 to 4 carbon atoms, and n is an integer of 0 to 3, but when there are a plurality of R 7 and Y, they are the
• a coupling agent having a functional group capable of copolymerizing with a polymerizable monomer for example, ⁇ - (meth) acryloyloxyalkyltrimethoxysilane [(meth) acryloyloxy group and the number of carbon atoms between the silicon atom: 3-12], ⁇ - (meth) acryloyloxyalkyltriethoxysilane [carbon number between (meth) acryloyloxy group and silicon atom: 3-12], vinyltrimethoxysilane, vinyltriethoxysilane, vinyltri Acetoxysilane, ⁇ -glycidoxypropyltrimethoxysilane and the like are preferably used.
• organic titanium compound examples include tetramethyl titanate, tetraisopropyl titanate, tetra n-butyl titanate, butyl titanate dimer, and tetra (2-ethylhexyl) titanate.
• organic zirconium compound examples include zirconium isopropoxide, zirconium n-butoxide, zirconium acetylacetonate, and zirconium acetate.
• organoaluminum compound examples include aluminum acetylacetonate and aluminum organolate chelate compounds.
• Examples of the acidic group-containing organic compound containing a phosphoric acid group include 2-ethylhexyl acid phosphate, stearyl acid phosphate, 2- (meth) acryloyloxyethyl dihydrogen phosphate, and 3- (meth) acryloyloxypropyl dihydrogen phosphate.
• the acidic group-containing organic compound having an acidic group such as a pyrophosphate group, a thiophosphate group, a phosphonic acid group, a sulfonic acid group and a carboxylic acid group
• those described in International Publication No. 2012/042911 are preferable. Can be used for.
• the surface treatment agent may be used alone or in combination of two or more. Further, an acidic group having a functional group capable of copolymerizing with the polymerizable monomer in order to enhance the chemical bond between the inorganic filler (C) and the polymerizable monomer and improve the mechanical strength of the cured product. It is more preferable to use the contained organic compound.
• the amount of the surface treatment agent used is not particularly limited, and for example, 0.1 to 50 parts by mass is preferable with respect to 100 parts by mass of the inorganic filler (C).
• Polymerization initiator (D) Next, the polymerization initiator (D) will be described.
• the polymerization initiator (D) include a heat polymerization initiator, a photopolymerization initiator, and a chemical polymerization initiator. These may be used alone or in combination of two or more.
• heat polymerization initiator examples include organic peroxides and azo compounds.
• organic peroxide examples include ketone peroxides, hydroperoxides, diacyl peroxides, dialkyl peroxides, peroxyketals, peroxyesters, and peroxydicarbonates.
• ketone peroxide examples include methyl ethyl ketone peroxide, methyl isobutyl ketone peroxide, methyl cyclohexanone peroxide, cyclohexanone peroxide and the like.
• hydroperoxide examples include 2,5-dimethylhexane-2,5-dihydroperoxide, diisopropylbenzene hydroperoxide, cumene hydroperoxide, t-butyl hydroperoxide and 1,1,3,3-tetramethylbutyl hydroperoxide. Can be mentioned.
• diacyl peroxide examples include acetyl peroxide, isobutyryl peroxide, benzoyl peroxide, decanoy peroxide, 3,5,5-trimethylhexanoyl peroxide, 2,4-dichlorobenzoyl peroxide and lauroyl peroxide.
• dialkyl peroxide examples include di-t-butyl peroxide, dicumyl peroxide, t-butyl cumyl peroxide, 2,5-dimethyl-2,5-di (t-butylperoxy) hexane, and 1,3-bis (t).
• dialkyl peroxide examples include di-t-butyl peroxide, dicumyl peroxide, t-butyl cumyl peroxide, 2,5-dimethyl-2,5-di (t-butylperoxy) hexane, and 1,3-bis (t).
• -Butylperoxyisopropyl) benzene and 2,5-dimethyl-2,5-di (t-butylperoxy) -3-hexine and the like can be mentioned.
• peroxyketal examples include 1,1-bis (t-butylperoxy) -3,3,5-trimethylcyclohexane, 1,1-bis (t-butylperoxy) cyclohexane, and 2,2-bis (t-butylperoxy).
• peroxy ester examples include ⁇ -cumyl peroxyneodecanoate, t-butylperoxyneodecanoate, t-butylperoxypivalate, 2,2,4-trimethylpentylperoxy-2-ethylhexanoate, and t.
• peroxydicarbonate examples include di-3-methoxyperoxydicarbonate, di (2-ethylhexyl) peroxydicarbonate, bis (4-t-butylcyclohexyl) peroxydicarbonate, diisopropylperoxydicarbonate, and di-n-propylperoxy. Examples thereof include dicarbonate, di (2-ethoxyethyl) peroxydicarbonate and diallylperoxydicarbonate.
• diacyl peroxide is preferably used from the viewpoint of overall balance of safety, storage stability and radical generation ability, and among them, benzoyl peroxide is more preferably used.
• Examples of the azo compound include 2,2'-azobis (isobutyronitrile), 2,2'-azobis (2,4-dimethylvaleronitrile), 4,4'-azobis (4-cyanovaleric acid), and the like. Examples thereof include 1,1'-azobis (cyclohexane-1-carbonitrile), dimethyl-2,2'-azobis (isobutyrate), and 2,2'-azobis (2-amidinopropane) dihydrochloride.
• photopolymerization initiator examples include (bis) acylphosphine oxides, ⁇ -diketones, coumarins and the like.
• 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, salts thereof 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)-.
• ⁇ -diketones examples include diacetyl, benzyl, camphorquinone, 2,3-pentadione, 2,3-octadione, 9,10-phenanthrenequinone, 4,4'-oxybenzyl, acenaphthenquinone and the like. Be done. Of these, camphorquinone is preferred.
• Examples of the coumarins include 3,3'-carbonylbis (7-diethylamino kumarin), 3- (4-methoxybenzoyl) coumarin, 3-thienoyl coumarin, 3-benzoyl-5,7-dimethoxy kumarin, and 3-benzoyl.
• 3,3'-carbonylbis (7-diethylaminocoumarin) and 3,3'-carbonylbis (7-dibutylaminocoumarin) are preferable.
• photopolymerization initiators it is preferable to use at least one selected from the group consisting of (bis) acylphosphine oxides, ⁇ -diketones, and coumarins, which are widely used in dental applications.
• the photopolymerization initiator may be further combined with a polymerization accelerator, if necessary, to efficiently carry out photopolymerization in a shorter time.
• the polymerization accelerator suitable for the photopolymerization initiator examples include tertiary amines, aldehydes, compounds having a thiol group, sulfinic acid and salts thereof, borate compounds, triazine compounds and the like.
• one type of polymerization accelerator may be used alone, or two or more types may be used in combination.
• the polymerization initiator (D) comprises a photopolymerization initiator, further comprises a polymerization accelerator of the photopolymerization initiator, and the polymerization accelerator is a tertiary amine, a curing for dental restoration. Examples include sex compositions.
• tertiary amines include N, N-dimethylaniline, N, N-dimethyl-p-toluidine, N, N-dimethyl-m-toluidine, N, N-diethyl-p-toluidine, N, N.
• aldehydes include dimethylaminobenzaldehyde, terephthalaldehyde and the like.
• Examples of the compound having a thiol group include 2-mercaptobenzoxazole, decanethiol, 3-mercaptopropyltrimethoxysilane, thiobenzoic acid and the like.
• sulfinic acid and salts thereof include benzenesulfinic acid, sodium benzenesulfinate, potassium benzenesulfinate, calcium benzenesulfinate, lithium benzenesulfinate, p-toluenesulfinic acid, sodium p-toluenesulfinate, p-toluene.
• redox-based polymerization initiators such as organic peroxides and amines; organic peroxides, amines and sulfinic acid (or salts thereof) are preferably used.
• a redox-based polymerization initiator it is necessary to take a packaging form in which the oxidizing agent and the reducing agent are separately packaged, and mix the two immediately before use.
• the oxidizing agent of the redox-based polymerization initiator include organic peroxides.
• the organic peroxide is not particularly limited as the oxidizing agent of the redox-based polymerization initiator, and known ones can be used. Specific examples thereof include organic peroxides exemplified by the heat polymerization initiator.
• diacyl peroxide is preferably used from the viewpoint of overall balance of safety, storage stability and radical generation ability, and among them, benzoyl peroxide is more preferably used.
• a tertiary aromatic amine having no electron-withdrawing group in the aromatic ring is usually used.
• the tertiary aromatic amine having no electron-withdrawing group in the aromatic ring include N, N-dimethylaniline, N, N-dimethyl-p-toluidine, N, N-dimethyl-m-toluidine, N, N-diethyl-p-toluidine, N, N-dimethyl-3,5-dimethylaniline, N, N-dimethyl-3,4-dimethylaniline, N, N-dimethyl-4-ethylaniline, N, N-dimethyl -4-Isopropylaniline, N, N-dimethyl-4-t-butylaniline, N, N-dimethyl-3,5-di-t-butylaniline, N, N-bis (2-hydroxyethyl) -3, 5-Dimethylaniline, N, N-dimethylaniline, N, N-d
• the chemical polymerization initiator may be used in combination with a polymerization accelerator, if necessary.
• the polymerization accelerator of the chemical polymerization initiator can be selected from the polymerization accelerators used in the general industry, and among them, the polymerization accelerator used for dental applications is preferably used. In addition, one type of polymerization accelerator may be used alone, or two or more types may be used in combination. Specific examples of the polymerization accelerator of the chemical polymerization initiator include amines, sulfinic acid and salts thereof, copper compounds, tin compounds, barbituric acid derivatives, vanadium compounds and the like.
• a curable composition for dental restoration wherein the polymerization initiator (D) comprises a chemical polymerization initiator, further comprises a polymerization accelerator of the chemical polymerization initiator, and the polymerization accelerator is amines.
• the polymerization initiator (D) comprises a chemical polymerization initiator
• the polymerization accelerator is amines.
• Amines used as a polymerization accelerator for a chemical polymerization initiator are classified into aliphatic amines and aromatic amines having an electron-withdrawing group on the aromatic ring.
• 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, tri
• Examples of the tertiary aromatic amine having an electron-withdrawing group in the aromatic ring used as the polymerization accelerator of the chemical polymerization initiator include ethyl 4- (N, N-dimethylamino) benzoate and 4- ( Methyl N, N-dimethylamino) benzoate, n-butoxyethyl 4- (N, N-dimethylamino) benzoate, 2- (methacryloyloxy) ethyl 4-N, N-dimethylaminobenzoate, 4- (N) , N-Dimethylamino) benzophenone, 4- (N, N-dimethylamino) butyl benzoate and the like.
• Examples of sulfinic acid and a salt thereof used as a polymerization accelerator include those exemplified as the polymerization accelerator of the above-mentioned photopolymerization initiator, and sodium benzenesulfinate, sodium p-toluenesulfinate, 2,4,6- Sodium triisopropylbenzenesulfinate is preferred.
• the copper compound used as the polymerization accelerator for example, acetylacetone copper, cupric acetate, copper oleate, cupric chloride, cupric bromide and the like are preferably used.
• tin compound used as the polymerization accelerator examples include di-n-butyl tin dilaurate, di-n-octyl tin dilaurate, di-n-octyl tin dilaurate, and di-n-butyl tin dilaurate.
• Particularly suitable tin compounds are di-n-octyl tin dilaurate and di-n-butyl tin dilaurate.
• a photopolymerization initiator because of the convenience of curing in the oral cavity, while for dental mill blanks, the degree of polymerization is increased. It is preferable to use a heat polymerization initiator because it improves the strength.
• the content of the polymerization initiator (D) in the present invention is not particularly limited, but from the viewpoint of curability and the like of the obtained composition, 0.001 to 30 parts by mass with respect to 100 parts by mass of the polymerizable monomer. Is preferable.
• the content of the polymerization initiator (D) is 0.001 part by mass or more with respect to 100 parts by mass of the polymerizable monomer, there is no possibility that the polymerization will proceed sufficiently and the mechanical strength will be lowered. It is preferably 0.05 parts by mass or more, and more preferably 0.1 parts by mass or more.
• the content of the polymerization initiator (D) is 30 parts by mass or less with respect to 100 parts by mass of the polymerizable monomer, sufficient mechanical strength is sufficient even when the polymerization performance of the polymerization initiator itself is low. Further, there is no possibility of causing precipitation from the composition, and more preferably, it is 20 parts by mass or less.
• the curable composition for dental restoration of the present invention may contain a polymer, particularly a prepolymer, from the viewpoint of reducing the polymerization shrinkage stress.
• dental composite resins are generally polymerized and cured by light irradiation, and during curing, polymerization shrinkage stress is applied to the adhesion interface between the cavity wall and the composite resin. If this polymerization shrinkage stress is large, a contraction gap may occur at the adhesive interface, which may cause secondary caries, dental pulp irritation, coloring, falling off of the cured product, etc., and thus has the effect of further reducing the polymerization shrinkage stress. Together, it can be said to be a more preferable dental composite resin.
• the curable composition for dental restoration of the present invention when used as a dental composite resin, the cured product has high mechanical strength, is excellent in properties such as water resistance and polishability, and is polymerized.
• the curable composition for dental restoration of the present invention preferably contains a polymer, particularly a prepolymer, because the effect of reducing contraction stress is more excellent.
• the prepolymer is an intermediate product in which the polymerization of the polymerizable monomer is stopped at an appropriate place, or a polymer in which a polymerizable functional group is introduced after the polymerization, both of which have an unreacted polymerizable functional group. Therefore, further polymerization is possible.
• One type of prepolymer may be used alone, or two or more types may be used in combination.
• the type of unreacted polymerizable functional group of the prepolymer is not particularly limited.
• the polymerizable functional group include a carbon-carbon double bond, a vinyl group, a vinyloxy group, a (meth) allyl group, a (meth) acryloyl group, a male oil group, a styryl group, a cinnamoyl group and the like.
• a (meth) acryloyl group is preferable, and a (meth) acryloyloxy group and a (meth) acrylamide group are more preferable.
• the number of unreacted polymerizable functional groups contained in the prepolymer is preferably 1 or more, more preferably 2 or more, on average per molecule of the prepolymer, and reduction of polymerization shrinkage stress. Since the effect is more excellent, the number is more preferably 5 or more, particularly preferably 10 or more, 15 or more, 20 or more, further 25 or more, and 1, The number is preferably 000 or less, more preferably 500 or less, and more preferably 100 or less, particularly preferably 50 or less, because the effect of reducing the polymerization shrinkage stress is more excellent. ..
• the method for measuring the number of unreacted polymerizable functional groups of the prepolymer is not particularly limited.
• the concentration (mol / g) of the unreacted polymerizable functional groups of the prepolymer can be determined by NMR measurement. Can be obtained by multiplying the weight average molecular weight of the prepolymer described later, and more specifically, can be obtained by the method described in Examples.
• the weight average molecular weight of the prepolymer is preferably 1,000 or more, and the effect of reducing the polymerization shrinkage stress is preferable, because the effect of the present invention is more prominently exhibited. It is more preferably 5,000 or more, further preferably 10,000 or more, and more preferably 1,000,000 or less, and the effect of reducing the polymerization shrinkage stress is further increased. From the viewpoint of superiority, it is more preferably 500,000 or less, further preferably 300,000 or less, particularly preferably 100,000 or less, 80,000 or less, and further 60,000 or less. You may.
• the method for measuring the weight average molecular weight of the prepolymer is not particularly limited, but it can be measured by GPC measurement or the like, and more specifically, it can be measured by the method described later in the examples.
• the content of the prepolymer in the curable composition for dental restoration of the present invention is not particularly limited, but the consistency stability, polymerization shrinkage stress and operability of the obtained curable composition for dental restoration, and the obtained cured product are not particularly limited. From the viewpoint of mechanical strength and the like, it is preferably 0.5% by mass or more, more preferably 1% by mass or more, and 3% by mass or more, based on the mass of the curable composition for dental restoration. It is more preferably 20% by mass or less, more preferably 18% by mass or less, further preferably 16% by mass or less, 12% by mass or less, and further 8% by mass. It may be as follows.
• the curable composition for dental restoration of the present invention includes a pH adjuster, an ultraviolet absorber, an antioxidant, a colorant (for example, a pigment), a chain transfer agent, an antibacterial agent, and the like. It is also possible to further add an X-ray contrast agent, a thickener, a fluorescent agent and the like. These may be used alone or in combination of two or more.
• the pigment may be any of an inorganic pigment and / or an organic pigment, and examples of the inorganic pigment include chromium acid salts such as yellow lead, zinc yellow and barium yellow; ferrocyanides such as navy blue; silver vermilion and cadmium yellow.
• Sulfides such as zinc sulfide and cadmium red; sulfates such as barium sulfate, zinc sulfate and strontium sulfate; oxides such as antimony white, zinc white, titanium white, red iron oxide and chromium oxide; water such as aluminum hydroxide Oxides: silicates such as calcium silicate and ultramarine blue; carbons such as carbon black and graphite.
• organic pigments include nitroso compounds such as naphthol green B and naphthol green Y; nitro pigments such as naphthol yellow S and resolefast yellow 2G; insoluble azos such as permanent red 4R, brilliant fast scarlet, hanza yellow and benzidine yellow.
• poorly soluble azo pigments such as resole red, lake red C, lake red D
• soluble azo pigments such as Brilliant Carmine 6B, Permanent Red F5R, Pigment Scarlet 3B, Bordeaux 10B
• Phthalocyanine Blue Phthalocyanine Green, Sky Blue
• Phthalocyanine pigments such as phthalocyanine pigments
• basic compounds such as rhodamine lake, malakite green lake, methyl violet lake
• acidic compounds such as peacock blue lake, eosin lake, quinoline yellow lake and the like.
• One of the pigments may be used alone, or two or more of the pigments may be used in combination, and the pigment is appropriately selected according to the desired color tone.
• the content of the pigment in the curable composition for dental restoration is appropriately adjusted according to a desired color tone and is not particularly limited, but is preferably 0.000001 parts by mass or more in 100 parts by mass of the curable composition for dental restoration. Yes, more preferably 0.00001 parts by mass or more, preferably 5 parts by mass or less, and more preferably 1 part by mass or less.
• the content of the pigment is preferably 0.000001 to 5 parts by mass, and more preferably 0.00001 to 1 part by mass in 100 parts by mass of the curable composition for dental restoration.
• chain transfer agent examples include mercaptan compounds (n-octyl mercaptan, n-dodecyl mercaptan, t-dodecyl mercaptan, hexadecyl mercaptan, n-octadecyl mercaptan, etc.), halogen compounds (carbon tetrachloride, methylene chloride, etc.).
• the method for producing the curable composition for dental restoration of the present invention includes, for example, the following steps (1) and (2).
• Kneading step is a step of performing a kneading operation, in which a (meth) acrylic acid ester compound (A), a mono (meth) acrylic acid ester compound (B) and a polymerization initiator (D) are placed in a kneader container.
• a (meth) acrylic acid ester compound (A), a mono (meth) acrylic acid ester compound (B) and a polymerization initiator (D) are placed in a kneader container.
• Is added to prepare a polymerizable monomer-containing composition and then the inorganic filler (C) is further added and kneaded to prepare a paste-like composition.
• the kneading method is not particularly limited as long as the effect of the present invention is obtained, and a known method can be adopted. It is preferable to knead while warming.
• the kneading temperature is preferably 40 to 60 ° C. If the temperature is lower than 40 ° C., the effect of shortening the kneading time cannot be sufficiently obtained, and if the temperature exceeds 60 ° C., polymerization curing or deterioration of the composition may occur during kneading. Further, during kneading, vacuum defoaming treatment can be performed if necessary.
• the defoaming step is a step of performing defoaming work. After putting the paste-like composition into the defoaming machine container, pressure is applied while removing air bubbles inside the paste by reducing the pressure. While extruding out of the container, defoaming is performed.
• the defoaming conditions are not particularly limited, but in order to efficiently remove air bubbles, the polymerizable property contains a (meth) acrylic acid ester compound (A), a mono (meth) acrylic acid ester compound (B), and a polymerization initiator (D).
• the degree of vacuum is preferably 5 to 200 Torr in order to prevent the monomer-containing composition and the inorganic filler (C) from separating.
• the depressurization time is preferably 3 to 30 minutes.
• the pressure at the time of extrusion is preferably 0.5 to 5 MPa.
• the pressurization time is preferably 3 to 30 minutes.
• heat treatment can be performed if necessary.
• the temperature is not particularly limited, but the temperature is preferably 40 to 60 ° C. in order to efficiently remove air bubbles.
• the curable composition for dental restoration of the present invention has excellent paste operability, the cured product has high mechanical strength, and is excellent in water resistance and abrasiveness, so that it can be suitably used as a dental material. Specifically, in the field of dentistry, it can be suitably used as a dental material (particularly a dental composite resin) that can replace a part or the whole of a natural tooth. Further, the cured product obtained by polymerizing and curing the curable composition for dental restoration of the present invention is used as a dental mill blank, which is a material to be cut used in a CAD / CAM system produced by cutting with a milling device. It can be preferably used.
• the flexural modulus of the cured product of the curable composition for dental restoration is preferably 8 GPa or more when used as a dental composite resin.
• the flexural modulus of the cured product of the curable composition for dental restoration is preferably 12 GPa or more when used as a dental mill blank.
• the flexural modulus of the cured product of the curable composition for dental restoration is not particularly limited, but may be 30 GPa or less because if it is too high, the tooth substance may be damaged such as wear and tear.
• a polymerizable monomer-containing composition was prepared by dissolving 0.5 parts by mass of THP as a heat polymerization initiator and 1.5 parts by mass of JJA as a polymerization accelerator in 70 parts by mass of D2.6E and 30 parts by mass of POBA.
• the product (M13) was prepared.
• composition of each polymerizable monomer-containing composition is shown in Table 1 below.
• compositions of the inorganic fillers (C1) to (C5) are shown in Table 2 below.
• the amounts of the mono (meth) acrylic acid ester compound, the mono (meth) acrylic acid ester compound (B) and the (meth) acrylic acid ester compound (A) shown in Table 3 were used, and these were used.
• Toluene 5% by mass of the total mass of the mono (meth) acrylic acid ester compound and the (meth) acrylic acid ester compound
• the amount of the chain transfer agent and the polymerization initiator shown in Table 3 was added thereto, and the mixture was stirred to obtain a toluene solution.
• This toluene solution was heated and stirred at 80 ° C. in an oil bath under reflux. After 240 minutes, heating was stopped and the mixture was added dropwise to hexane (6 times by mass of the toluene solution) to obtain a precipitate precipitated on the bottom. This was dried under reduced pressure at room temperature overnight to obtain white powder prepolymers (P1) to (P3).
• compositions of the prepolymers (P1) to (P3) are shown in Table 3 below.
• the weight average molecular weight of the prepolymer was determined by GPC measurement. That is, tetrahydrofuran was used as the eluent, and two columns of "TSKgel SuperMultipore HZM-M” manufactured by Tosoh Corporation and "TSKgel SuperHZ4000" were connected in series. Further, as the GPC apparatus, "HLC-8320GPC” manufactured by Tosoh Corporation equipped with a differential refractive index detector (RI detector) was used. For the measurement, first, 4 mg of prepolymer was dissolved in 5 mL of tetrahydrofuran to prepare a sample solution.
• RI detector differential refractive index detector
• the temperature of the column oven was set to 40 ° C., 20 ⁇ L of the sample solution was injected at an eluent flow rate of 0.35 mL / min, and the chromatogram of the prepolymer was measured.
• RP / D [(I 5.55 + I 6.12 ) / 2] / (I 8.10 / 4) (Here, I 5.55 indicates the integral value of the peak of 5.55 ppm, I 6.12 indicates the integral value of the peak of 6.12 ppm, and I 8.10 indicates the integral value of the peak of 8.10 ppm.
• Test Example 1 [Mechanical strength (3-point bending test)] Regarding the dental composite resin, the curable composition for dental restoration of each of the manufactured Examples and Comparative Examples is vacuum defoamed, filled in a stainless steel mold (dimensions: 2 mm ⁇ 2 mm ⁇ 25 mm), and slid up and down. It was pressure-welded with glass and cured by irradiating both sides with light for 10 seconds per point with an LED light irradiator for dental polymerization (trade name "Pencure 2000", manufactured by Morita Co., Ltd.), 5 points on each side. For each Example and Comparative Example, 5 cured products were prepared as samples.
• a universal testing machine manufactured by Shimadzu Corporation, trade name "AG-I 100 kN" is used under the conditions of a distance between fulcrums of 20 mm and a crosshead speed of 1 mm / min.
• the flexural strength and flexural modulus of the cured sample were measured, and the average value of the measured values of each sample was calculated and used as the flexural strength and flexural modulus.
• the curable compositions for dental restoration of each of the manufactured Examples and Comparative Examples are vacuum defoamed and then filled into stainless steel molds (dimensions: 1.2 mm ⁇ 4 mm ⁇ 14 mm) of different sizes.
• the measurement was carried out in the same manner as the above-mentioned dental composite resin sample, except that the distance between the fulcrums when using the universal testing machine was 12 mm and 10 cured products were prepared as samples.
• the bending strength of the dental composite resin is judged to be good at 150 MPa or more, and further good at 180 MPa or more.
• the flexural modulus of the dental composite resin is judged to be good at 8 GPa or more, and further better at 10 GPa or more. It is judged that the bending strength of the dental mill blank is 200 MPa or more, and 240 MPa or more is even better.
• the flexural modulus of the dental mill blank is judged to be good at 12 GPa or more, and further good at 15 GPa or more.
• As the mechanical strength those satisfying the criteria of both the bending strength and the bending elastic modulus were accepted.
• Test Example 3 [Abrasiveness]
• the curable compositions for dental restoration of each of the produced Examples and Comparative Examples were vacuum defoamed and then filled in a Teflon (registered trademark) type (diameter 10 mm, thickness 2.0 mm).
• a sample was taken out from a Teflon (registered trademark) mold, and a clean smooth surface was polished with # 600 abrasive paper under dry conditions.
• Volvere RX (manufactured by Nakanishi Inc.) is used as a technical engine, and under water injection conditions, a smooth surface is polished for 10 seconds at a rotation speed of about 5000 rpm using silicon point brown (manufactured by Matsukaze Co., Ltd.), followed by silicon. Point The smooth surface was polished for 10 seconds at a rotation speed of about 5000 rpm using blue color (manufactured by Matsukaze Co., Ltd.). The gloss of the obtained polished surface was shown by using a gloss meter (manufactured by Nippon Denshoku Industries Co., Ltd., VG 7000) at a ratio when the mirror was set to 100%. The measurement angle was 60 °. The measured average values are shown in Tables 4 and 5. The glossiness is preferably 80% or more, and more preferably 85% or more.
• Test Example 4 The curable compositions for dental restoration of each of the produced Examples and Comparative Examples were vacuum defoamed, filled in a syringe, and allowed to stand at 25 ° C. for 24 hours to prepare a sample for the adhesion test.
• the paste was extruded from a syringe and filled into a cup having a capacity of lower bottom surface ⁇ 11 mm ⁇ upper surface ⁇ 13 mm ⁇ height 8 mm.
• a jig with a stainless steel cylinder of ⁇ 10 mm x 5 mm at the tip is attached to a small desktop testing machine (EZ Test manufactured by Shimadzu Corporation), and a stainless steel cylinder attached to the filled paste surface is made of stainless steel.
• the measured average values are shown in Table 4.
• the adhesive force is preferably 1.5 N or less, more preferably 1.0 N or less.
• the adhesive force is 2.0 N or more, it is judged that the operability of the paste when filling with a dental instrument is low.
• Test Example 5 [Polymerization shrinkage stress] Curability for dental restoration obtained in each Example or Comparative Example in a ring-shaped mold (stainless steel, inner diameter 5.5 mm ⁇ thickness 0.8 mm) installed on a glass plate having a thickness of 4.0 mm. The composition was filled. The glass plate used was sandblasted with alumina powder having a particle size of 50 ⁇ m. A stainless steel jig ( ⁇ 5 mm) connected to a universal testing machine (manufactured by Shimadzu Corporation, trade name “Autograph AG-I 100 kN”) is installed on the filled paste, and the curable composition for dental restoration is applied. I sandwiched it.
• the paste was cured by irradiating the paste with light for 20 seconds through a glass plate using an LED light irradiator for dental polymerization (trade name “Pencure 2000”, manufactured by Morita Co., Ltd.).
• the average value of the measured values is shown in Table 4.
• the polymerization shrinkage stress is preferably 10.0 MPa or less, more preferably 9.8 MPa or less, further preferably 9.5 MPa or less, and particularly preferably 9.0 MPa or less.
• Examples 1 to 16, Comparative Examples 1 to 4 (dental composite resin)
• a curable composition was prepared.
• the characteristic evaluation test (Test Examples 1 to 5) was carried out on the prepared curable composition for dental restoration. The results are shown in Table 4 below.
• the operability of the pastes obtained in Examples 1 to 16 was all good. Further, it was found that the cured product had high mechanical strength and was excellent in water resistance without a decrease in strength due to immersion in water at 37 ° C. assuming the oral cavity. Furthermore, it was found that the cured product was excellent in abrasiveness. In addition, in the pastes obtained in Examples 12 to 16, the polymerization shrinkage stress was reduced. On the other hand, the paste obtained in Comparative Example 1 had low mechanical strength and water resistance. Further, the paste obtained in Comparative Example 2 had a little low mechanical strength and water resistance, but was very poor in polishability and operability. Further, the pastes obtained in Comparative Examples 3 and 4 had very poor mechanical strength and water resistance, and in Comparative Example 4, the polishability was very poor.
• Examples 17 to 20, Comparative Example 5 (Dental mill blank)
• the polymerizable monomer-containing compositions (M13) and (M14) obtained in the above production example and the inorganic fillers (C1) to (C5) are kneaded at the composition ratios shown in Table 5 below.
• the uniform was vacuum defoamed to prepare paste-like curable compositions for dental restoration of Examples 17 to 20 and Comparative Example 5.
• the curable composition for dental restoration was poured into a 20 mm ⁇ 30 mm ⁇ 60 mm rectangular mold and heated at 50 ° C. for 1 hour. Then, while pressurizing at 5 MPa, heat treatment was performed at 150 ° C. for 1 hour to obtain a cured product as a dental mill blank.
• the characteristic evaluation test (Test Examples 1 to 3 and 6) was carried out on the obtained cured product. The results are shown in Table 5 below.
• the cured product of the present invention has high mechanical strength and is excellent in water resistance and abrasiveness. It was also found that the curable composition for dental restoration of the present invention has excellent paste operability and can suppress bubbles generated in the cured product.
• the cured product has high mechanical strength and is excellent in water resistance and abrasiveness.
• the curable composition for dental restoration of the present invention has excellent paste operability, that is, excellent handling, and has sufficient mechanical strength to replace natural teeth, and repairs tooth defects and caries. It is preferably used as a material for use, particularly as a dental composite resin. Further, the cured product is suitably used as a dental mill blank.

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