JP2005255654A - Dental curable composition and method for preserving the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a dental curable composition having no discoloration during curing and excellent preservability in a two-paste dental curing composition causing neither scattering of powder nor inclusion of foam during kneading in use. <P>SOLUTION: The curable composition comprising (1) a non-oxidizing radically polymerizable monomer, (2) a filler, (3) a ternary chemical polymerization initiator composed of a pyrimidine trione derivative, a copper compound soluble in the non-oxidizing radically polymerizable monomer and an organic chlorine salt compound and (4) a tertiary amine compound is dividedly preserved in (A) a paste comprising a non-oxidizing radically polymerizable monomer, a filler, a pyrimidine trione derivative and a tertiary amine compound and (B) a paste comprising a non-oxidizing radically polymerizable monomer, a filler, a copper compound soluble in the non-oxidizing radically polymerizable monomer and an organic chlorine salt compound until immediately before use. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a dental curable composition. More specifically, the two-paste denture base lining material is superior in operability and stable over a long period of time, since there is little discoloration of the cured body over time, no scattering of powder during kneading and no mixing of bubbles. It relates to the curable composition which can be used suitably as.

  Various polymerization initiators that polymerize and cure monomers capable of polymerization in the presence of radicals such as (meth) acrylic acid esters are known. In the dental field, such polymerization initiators are roughly classified into photopolymerization initiators that initiate polymerization by light irradiation and chemical polymerization initiators that initiate polymerization near room temperature by contacting two or more compounds. It is used properly according to the use of the dental curable composition.

  A polymerization initiator composed of an organic peroxide such as benzoyl peroxide and an aromatic tertiary amine is a typical chemical polymerization initiator in the dental field, and rapidly polymerizes and cures at room temperature to the oral cavity temperature. Utilizing the properties generated by the body, it is widely used in dental adhesives, dental composite filling restorative materials, denture base materials, denture base lining materials and the like.

  The denture base lining material is a material for modifying a denture that has become incompatible with the patient's palate after long-term use and correcting it so that it can be used again. It cures from room temperature to the oral cavity temperature. The paste is placed on the denture base, directly inserted into the patient's oral cavity, and adapted to the oral mucosal surface. In the lining method, a combination of a radical polymerizable monomer and a chemical polymerization initiator composed of a benzoyl peroxide-aromatic tertiary amine compound as described above is widely used as a material for curing near room temperature. ing. Conventionally, as such a lining material, generally, a powdery component obtained by mixing a powdered synthetic resin such as polymethyl methacrylate, polyethyl methacrylate, a copolymer of methyl methacrylate and ethyl methacrylate and benzoyl peroxide; Two-component materials composed of a liquid component in which a monomer such as a radical polymerizable compound and an aromatic tertiary amine compound are mixed are used.

  With such two-component materials, when both components are mixed, the powdered synthetic resin dissolves in the radical polymerizable monomer, thickens into a paste, and can be placed in dentures and shaped in the oral cavity At the same time, the benzoyl peroxide and the aromatic tertiary amine compound are mixed and contacted so that radicals are easily generated from the room temperature to the temperature in the oral cavity. It has the function of curing.

  However, it is necessary to measure and mix the powdery component and the liquid component at the time of use of the denture base lining material, and skill is required to mix the powder component without scattering or mixing bubbles. There were drawbacks such as In order to overcome such drawbacks, the denture base lining material is required to be made into a paste.

  In order to make a denture base lining material into a paste, it is necessary to dissolve or disperse the chemical polymerization initiator components in two pastes each composed of a radical polymerizable monomer and a filler. For example, in the above-described chemical polymerization initiator system composed of benzoyl peroxide and an aromatic tertiary amine compound, the paste is stored separately in the state of a paste in which benzoyl peroxide is dissolved and a paste in which an aromatic tertiary amine compound is dissolved. A form in which two types of paste are kneaded and used immediately before use is conceivable. However, benzoyl peroxide is known to be decomposed by heat alone, and gradually decomposes even near room temperature, which is the storage temperature of general denture base lining materials. In the state where the body coexists, there is a drawback that the radical polymerizable monomer is cured during storage. Furthermore, dental materials are often transported by private cars when transporting to a dental clinic or the like, but it is not uncommon for the temperature in the vehicle to exceed 50 ° C. in the summer. . Under such high temperatures, the stability of benzoyl peroxide is further reduced.

  Moreover, the polymerization initiator of the benzoyl peroxide-aromatic tertiary amine compound system is a color change at the time of hardening of the denture base lining material derived from the by-product produced when both react, and further the cured product. When used for a long time, there were drawbacks such as time-dependent discoloration of the cured product resulting from oxidation of the aromatic tertiary amine compound.

  On the other hand, a chemical polymerization initiator composed of a pyrimidinetrione derivative, a copper compound and an organic chlorine salt compound is known as a chemical polymerization initiator other than the benzoyl peroxide-tertiary amine compound system. (For example, refer to Patent Document 1). It is known that a chemical polymerization initiator system using such a pyrimidinetrione derivative has little discoloration when the radical polymerizable monomer is polymerized and also has little discoloration with time after curing.

  Further, a curable composition containing a pyrimidinetrione derivative, a copper compound and an organic chlorine salt compound as a chemical polymerization initiator and an aromatic tertiary amine compound is further added to improve the curability. (For example, refer to Patent Document 2).

  Chemical polymerization initiator systems using these pyrimidinetrione derivatives are known as polymerization initiators for curable compositions composed of a powdery component and a liquid component. Resin powder is used in consideration of storage stability and curability. A pyrimidinetrione derivative and a copper compound may be added to a powdery component having a main component, an organochlorine compound and, if necessary, a tertiary amine compound to a liquid component having a radically polymerizable monomer as a main component. Has been done.

Japanese Patent Application Laid-Open No. 11-71220.

JP-A-6-219919

  The present invention relates to a two-paste type dental curable composition that is free from powder scattering and air bubbles in kneading during use, and has no discoloration at the time of curing and has excellent storage stability. The purpose is to provide goods.

  The present inventors pay attention to the fact that in the chemical polymerization initiator system using the pyrimidinetrione derivative, there is little discoloration at the time of curing, and diligently investigated a two-paste type curable composition using the chemical polymerization initiator system. Went. However, it has been found that when a pyrimidinetrione derivative and a radical polymerizable monomer are allowed to coexist, the stability is poor, and there is a problem that, for example, curing occurs at a temperature of about 50 ° C. in about several hours.

  Therefore, further studies have been conducted to make the pyrimidinetrione derivative and radical polymerizable monomer coexist with excellent stability, and as a result, the tertiary amine compound can be further coexisted to dramatically improve stability. It has been found that the above problems can be solved and the present invention has been completed.

  That is, the present invention comprises (1) a non-acidic radical polymerizable monomer, (2) a filler, (3) a pyrimidinetrione derivative, a copper compound soluble in the non-acidic radical polymerizable monomer, and an organic chlorine salt compound. A curable composition comprising a chemical polymerization initiator and (4) a tertiary amine compound, comprising (A) a non-acidic radical polymerizable monomer, a filler, a pyrimidinetrione derivative, and a tertiary amine compound And (B) a non-acidic radical polymerizable monomer, a filler, a paste containing a copper compound and an organic chlorine salt compound soluble in the non-acidic radical polymerizable monomer until divided into just before use. It is the preservation | save method of the dental curable composition characterized by the above-mentioned.

  Another invention includes (A) a non-acidic radically polymerizable monomer, a filler, a pyrimidinetrione derivative, and a tertiary amine compound, and (B) a non-acidic radically polymerizable monomer and a filler. , A dental curable composition that is stored and divided into pastes containing a copper compound and an organic chlorine salt compound that are soluble in a non-acidic radically polymerizable monomer, Another invention is a denture base lining material comprising the dental curable composition.

  According to the present invention, a two-paste type dental curable composition that is free from powder scattering and air bubble mixing during kneading, is rapidly cured at room temperature by mixing and kneading both pastes, and stored. Excellent thermal stability at the time, and less discoloration during curing.

  The dental curable composition in the present invention includes (1) a non-acidic radical polymerizable monomer, (2) a filler, (3) a pyrimidinetrione derivative, a copper compound soluble in the non-acidic radical polymerizable monomer, And a chemical polymerization initiator composed of an organic chlorine salt compound, and (4) a tertiary amine compound.

  The non-acidic radical polymerizable monomer (1) can be used without any limitation as long as it is a compound having no acidic group in the molecule of the radical polymerizable monomer. Specifically, the acidic group refers to a functional group capable of dissociating active protons having a pKa of less than 5, such as a phosphinico group, a phosphono group, a sulfo group, or a carboxyl group.

  As such a non-acidic radically polymerizable monomer, a (meth) acrylate monomer is mainly used because of its good polymerizability. Specific examples of the (meth) acrylate monomer include the following (1) to (4).

(1) Monofunctional radical polymerizable monomer (meth) acryl such as ethylhexyl (meth) acrylate, isodecyl (meth) acrylate, n-lauryl (meth) acrylate, tridecyl (meth) acrylate, n-stearyl (meth) acrylate Alkyl ester of acid, cyclohexyl (meth) acrylate, benzyl (meth) acrylate, phenoxyethyl (meth) acrylate, isobornyl (meth) acrylate, 2-hydroxyethyl (meth) acrylate, 3-hydroxypropyl (meth) acrylate, tetrahydrofur Furyl (meth) acrylate, glycidyl (meth) acrylate, 1H, 1H, 3H-hexafluorobutyl methacrylate, 1H, 1H, 5H-octafluoropentyl methacrylate, 1H, 1H, 6 Examples include fluorine-containing (meth) acrylates such as H-decafluorohexyl methacrylate and 1H, 1H, 7H-dodecafluoroheptyl methacrylate, and (meth) acrylates represented by the following formulas (a) to (g).

In the above formulas, R ¹ is a hydrogen atom or a methyl group, R ² and R ³ are each an independent alkylene group, R ⁴ is an alkyl group, and m is an integer of 0 or 1-10. And n is an integer of 1 to 10 (provided that m + n is an integer of 2 to 10). The alkylene group as R ² or R ³ is not particularly limited, but is represented by the above formulas (a) to (e) in terms of the viscosity (easy handling) of the radical polymerizable monomer and the availability. In the compounds to be obtained, those having 1 to 6 carbon atoms such as methylene group, ethylene group, ethylidene group, trimethylene group, propylene group, tetramethylene group, 1-methyltrimethylene group, 1,2-dimethylethylene group and hexamethylene group. Among these, an alkylene group, particularly an alkylene group having 1 to 4 carbon atoms is preferable. Moreover, as the alkyl group of R ^{4 in} the compounds represented by the formulas (a) to (g), for the same reason, an alkyl group having 1 to 4 carbon atoms such as a methyl group, an ethyl group, a propyl group, and a butyl group, these Among these, a methyl group or an ethyl group is preferable. For the same reason, the sum of m and n in the formula (f) is preferably 10 or less, more preferably 5 or less, and n in the formula (g) is 10 or less, further 5 or less. preferable.

(2) Bifunctional radical polymerizable monomer Ethylene glycol dimethacrylate, diethylene glycol dimethacrylate, triethylene glycol dimethacrylate, butylene glycol dimethacrylate, neopentyl glycol dimethacrylate, propylene glycol dimethacrylate, 1,3-butanediol dimethacrylate 1,4-butanediol dimethacrylate, 1,6-hexanediol dimethacrylate, 1,9-nonanediol dimethacrylate, 1,10-decanediol dimethacrylate, 2,2-bis (methacryloxyphenyl) propane, 2 , 2-bis [4- (3-methacryloxy) -2-hydroxypropoxyphenyl] propane, 2,2-bis (4-methacryloxyethoxyphenyl) propane, 2,2- Bis (4-methacryloxydiethoxyphenyl) propane, 2,2-bis (4-methacryloxytetraethoxyphenyl) propane, 2,2-bis (4-methacryloxypentaethoxyphenyl) propane, 2,2-bis ( 4-methacryloxydipropoxyphenylpropane, 2- (4-methacryloxyethoxyphenyl) -2- (4-methacryloxydiethoxyphenyl) propane, 2- (4-methacryloxydiethoxyphenyl) -2- (4- Methacryloxytriethoxyphenyl) propane, 2- (4-methacryloxydipropoxyphenyl-2- (4-methacryloxytriethoxyphenyl) propane, 2,2-bis (4-methacryloxypropoxyphenyl) propane, 2,2 -Bis (4-methacryloxyisopropoxyphenyl) Propane, and these acrylate.

(3) Trifunctional radically polymerizable monomer Examples include trimethylolpropane tri (meth) acrylate, trimethylolethane tri (meth) acrylate, pentaerythritol tri (meth) acrylate, and trimethylolmethane tri (meth) acrylate.

(4) Tetrafunctional radically polymerizable monomer Examples include pentaerythritol tetramethacrylate and pentaerythritol tetraacrylate.

  In the present invention, such a radical polymerizable monomer may be used alone, or two or more kinds of radical polymerizable monomers may be used in combination. Further, a plurality of combinations having different numbers of functional groups having radical polymerizability can be freely selected.

  In particular, when the dental curable composition in the present invention is used as a denture base lining material, it is preferable to use a combination of a monofunctional radical polymerizable monomer and a bifunctional radical polymerizable monomer, Methyl methacrylate, ethyl methacrylate and the following compounds AE-1 to AE-3

Monofunctional radical polymerizable monomers such as 1,4-butanediol dimethacrylate, 1,6-hexanediol dimethacrylate, 1,9-nonanediol dimethacrylate, 1,10-decanediol dimethacrylate, etc. It is more preferable to select one from each of the functional radical polymerizable monomers and combine them at a mass ratio of 20/80 to 80/20.

  The filler (2) in the present invention is blended for the purpose of improving the operability by adjusting the viscosity of the paste, reducing the heat generated by curing by reducing the radical polymerizable monomer concentration, and reducing the polymerization shrinkage during curing. Any known filler can be used without particular limitation. Specifically, organic fillers typified by crosslinked polymethacrylates such as crosslinked polymethyl methacrylate and crosslinked polyethyl methacrylate, crosslinked polystyrene, etc .; borosilicate glass, soda glass, aluminosilicate, fluoroaluminosilicate, glass ceramics, Inorganic fillers typified by composite inorganic oxide particles such as silica, silica / titania, silica / zirconia, and silica alumina are suitable. Regarding the above organic filler, it is necessary that the added filler has a structure that does not substantially dissolve in the radical polymerizable monomer used in the dental curable composition of the present invention. Those crosslinked with a polyfunctional polymerizable monomer such as dimethacrylate are used. A filler having a particle diameter in the range of 0.01 to 50 μm, preferably in the range of 0.1 to 30 μm is preferably used. When the filler particle diameter exceeds 50 μm, the prepared paste becomes rough, and fillers of less than 0.01 μm are difficult to obtain and are not practical. The shape of the filler may be spherical, irregular, or indefinite, and is not particularly limited.

  In the present invention, a pyrimidinetrione derivative, a copper compound soluble in the non-acidic radical polymerizable monomer, and an organic chlorine salt compound act as a ternary chemical polymerization initiator.

  The pyrimidinetrione derivative is not particularly limited as long as it is a compound having a polymerization initiating ability in the above combination, and a known compound may be employed. Specific examples of the pyrimidinetrione derivative include N-cyclohexyl-5-methylpyrimidinetrione, N-cyclohexyl-5-ethylpyrimidinetrione, N-cyclohexyl-5- (n-propyl) pyrimidinetrione, N-cyclohexyl-5 -(Iso-butyl) pyrimidinetrione, N-cyclohexyl-5- (n-butyl) pyrimidinetrione, N-cyclohexyl-5- (iso-butyl) pyrimidinetrione, N-cyclohexyl-5- (tert-butyl) pyrimidinetrione Pyrimidinetrione derivatives substituted with a cyclohexyl ring at the N-position of 1-benzyl-5-phenylpyrimidinetrione, 5-butylpyrimidinetrione, 5-phenylpyrimidinetrione, 1,3-dimethylpyrimidinetrione, 5-ethylpyrimidinetrio Although like is preferably used, it may be used alone or in combination. Among these, N-cyclohexyl-5-methylpyrimidinetrione and N-cyclohexyl-5-ethylpyrimidinetrione are particularly preferably used from the viewpoint of solubility in a radical polymerizable monomer and transparency of a cured product.

  The copper compound is not limited as long as it dissolves in the non-acidic radical polymerizable monomer. Specifically, acetylacetone copper, copper 4-cyclohexylbutyrate, copper oleate compound and the like are suitably used. Among these, acetylacetone copper is particularly excellent, but these copper compounds may be used alone or in combination. On the other hand, a copper compound that does not dissolve in the non-acidic radical polymerizable monomer, such as cupric chloride, cannot cure the curable composition within a practical time for dental use.

  The organic chlorine salt compound is not particularly limited as long as it is a compound having a polymerization initiating ability in the above combination, and a known compound may be employed. Specific examples of the organic chlorine compounds include organic compounds such as dilauryldimethylammonium chloride, lauryltrimethylammonium chloride, tetra-n-butylammonium chloride, trioctylethylammonium chloride, benzyldimethylcetylammonium chloride, and benzyldimethylstearylammonium chloride. Ammonium salts can be suitably used. Moreover, you may use these 1 type or in mixture of 2 or more types.

  As the (4) tertiary amine compound used in the present invention, known compounds can be used without any particular limitation. Specific examples include N, N-dimethylaniline, N, N-dimethyl-p-toluidine, N, N-diethylaniline, N, N-diethanol-p-toluidine, N, N-dipropanol-p-toluidine. Aromatic tertiary amines such as triethanolamine, ethyldiethanolamine, tetraethylethylenediamine, N, N, N ′, N′-tetramethylethylenediamine and the like, and these include one or two of them. You may mix and use a seed | species or more. Of the above-mentioned tertiary amine compounds, aliphatic tertiary amine compounds are particularly preferably used since the dental curable composition cured product has little discoloration over time.

  In the dental curable composition of the present invention, in addition to the components (1) to (4), a known component may be blended as a blending component of the dental curable composition. Examples of such components include radical polymerizable monomers having acidic groups, polymerization inhibitors such as butylhydroxytoluene and methoxyhydroquinone; ultraviolet absorbers; alcohols or plasticizers such as ethanol, dibutylphthalate, and dioctylphthalate; polymethyl Polymers soluble in radically polymerizable monomers such as methacrylate, polyethyl methacrylate, and a copolymer of methyl methacrylate and ethyl methacrylate; dyes, pigments, fragrances and the like.

  In the present invention, each of the above components comprises (A) a non-acidic radical polymerizable monomer, a filler, a pyrimidinetrione derivative, and a tertiary amine compound, and (B) a non-acidic radical polymerizable monomer. The greatest feature is that it is divided into a paste containing a copper compound and an organic chlorine salt compound soluble in a monomer, a filler, and a non-acidic radically polymerizable monomer, and packed and stored in that state until use. Have

  As described above, when a pyrimidinetrione derivative and a radical polymerizable monomer coexist, the stability becomes unsatisfactory. However, when a tertiary amine compound coexists, good thermal stability is exhibited. become. In other words, the effects of the present invention cannot be obtained even if a tertiary amine compound is not blended or (B) the blend is blended. Moreover, even if a copper compound or an organic chlorine salt compound is allowed to coexist with a pyrimidinetrione derivative, it will lack storage stability.

  By blending the non-acidic radically polymerizable monomer and the filler into the packaging of both (A) and (B), each packaging becomes a paste, and during the kneading during use, powder scattering and bubbles And a dental curable composition having excellent operability.

  The other additive components may be blended into either (A), (B) or both pastes in consideration of storage stability and the like, but may be an acid such as a radical polymerizable monomer having an acidic group. When the compound is added to the paste (A), it reacts with the tertiary amine compound to form a salt and loses the effect of the tertiary amine compound. B) It is necessary to mix with a paste or mix a tertiary amine compound with an acid equivalent or more of the acid compound. In addition, when the dental curable composition is a material having a large contact area in the oral cavity such as a denture base material and a denture base lining material, a large amount of such a radical polymerizable monomer having an acidic group is blended. In many cases, an unpleasant feeling is caused by feeling a strong acidity. Therefore, even when the radical polymerizable monomer having the acidic group is blended, it is better to make it as small as possible.

  In the present invention, the blending ratio of the components (1) to (4) is not particularly limited, and may be appropriately set according to a more specific use of the dental curable composition, but good curing. In general, the following is performed to obtain the properties, operability and storage stability. That is, 10 parts by weight of filler with respect to a total of 100 parts by mass of radical polymerizable monomers (non-acidic radical polymerizable monomer and radical polymerizable monomer having no acidic group blended as necessary). The range of -200 mass parts, the range of 0.05-5 mass parts of pyrimidinetrione derivatives, the range of 0.0005-0.1 mass parts of copper compounds, and the range of 0.1-5 mass parts of organic chlorine salt compounds In addition, the molar ratio of the tertiary amine compound to the pyrimidinetrione derivative is 0.5 to 4, more preferably 1 to 2.

  The radically polymerizable monomer and filler are used so that the mixing ratio of the paste (A) and the paste (B) at the time of use is approximately 1: 1 by volume, and furthermore, the viscosity of both pastes is approximately the same. It is more preferable to sort by adjusting the type and amount.

  The method for producing the paste (A) and the paste (B) is not particularly limited, and may be performed according to a known method for producing a dental paste. Specifically, a predetermined amount of each component to be blended is weighed and sufficiently kneaded, and the paste is degassed under reduced pressure to remove bubbles.

  The dental curable composition comprising the paste (A) and the paste (B) thus obtained is stored in separate containers, and a predetermined amount of both pastes are taken out from each container and mixed and kneaded. To sum up. By this kneading, a ternary polymerization initiator composed of a pyrimidinetrione derivative, a copper compound, and an organic chlorine salt compound polymerizes and cures the radical polymerizable monomer even at room temperature. Therefore, after mixing, before kneading, the kneaded product is put in a predetermined mold or is shaped and cured at room temperature or in the oral cavity.

  As described above, the dental curable composition of the present invention has excellent properties such as thermal stability in a stored state and little discoloration of the cured product during curing. Such properties are useful in various dental curable compositions and are used in dental adhesives, dental composite filling restorative materials, denture base materials, denture base lining materials for direct or indirect methods, etc. be able to. In particular, since it is used in a large amount, it is highly demanded to be polymerized and cured with a chemical polymerization initiator, and it is suitable as a denture base lining material having a great influence when discolored.

  EXAMPLES The present invention will be specifically described below with reference to examples, but the present invention is not limited to these examples. The compounds and their abbreviations used in the examples and comparative examples are shown in (1), the evaluation methods for the composition or composition cured product are shown in (2) to (4), and the production examples of pyrimidinetrione derivatives (5) Examples of production of propionoxyethyl methacrylate are shown in (7) to (6).

(1) Abbreviation
[Radically polymerizable monomer]
AE-1; acetoacetoxyethyl methacrylate (manufactured by Shin Nippon Chemical)
HPr; propionoxyethyl methacrylate HD; hexamethylenediol dimethacrylate (manufactured by Kyoeisha Chemical)
ND: Nonamethylenediol dimethacrylate (manufactured by Kyoeisha Chemical)
PM: Mixture of 2-methacryloyloxyethyl dihydrogen phosphate and bis (2-methacryloyloxyethyl) hydrogen phosphate (molar ratio 1: 4)
[Pyrimidinetrione derivatives]
CMP; N-cyclohexyl-5-methylpyrimidinetrione CEP; N-cyclohexyl-5-ethylpyrimidinetrione [organochlorine salt compound]
LMAC: Dilauryldimethylammonium chloride (made by Takenaka Yushi)
[Tertiary amine compound]
PEAT; N, N-diethyl-p-toluidine (manufactured by Tokyo Chemical Industry)
MDEA: Methyldiethanolamine (Wako Pure Chemical Industries, Ltd.)
[Copper compound]
CuAc; acetylacetone copper (manufactured by Doujin Chemical)
[Filler]
MMA-1; cross-linked polymethyl methacrylate (manufactured by Sekisui Plastics Co., Ltd .: MB30X-5)
(2) Thermal Stability Test of Paste 20 g of the paste to be evaluated was placed in a 30 ml screw tube bottle, covered, and stored in an incubator controlled at 50 ± 2 ° C. for 1 week. Samples cured during storage were marked with x.

(3) Evaluation of curability The curability of the composition was determined by mixing the pastes A and B after being stored by the above method (2) at a mass ratio of 1: 1, and this mixed paste was 20 × 20 × 2 mm. Poured into a mold and cured at 37 ° C. for 1 hour. The obtained cured product was taken out of the mold and absorbed in distilled water at 37 ° C. for 24 hours. Among the obtained cured bodies, the Knoop hardness was measured for a sample cured to such a degree that the hardness could be measured using a micro hardness meter manufactured by Matsuzawa Seiki under the conditions of 100 gf and 20 seconds load application.

(4) Discoloration test The cured product obtained by the method (3) was stored in 80 ° C. water for 30 days, and the degree of discoloration of the cured product before and after storage was evaluated according to the following evaluation criteria.
Score 4 Brown discoloration score 3 Yellow discoloration score 2 Slight yellow discoloration score 1 White turbidity only score 0 No change (5) Production of N-cyclohexyl-5-ethylpyrimidinetrione 10 g (0.07 mol) of cyclohexylurea, First, diethyl ethyl malonate (13.2 g, 0.07 mol), sodium ethoxide (4.8 g, 0.07 mol), and ethanol (100 ml) were charged and reacted at reflux temperature for 5 hours. After the reaction, the reaction solution was added to 500 ml of water and acidified with hydrochloric acid. The precipitated oil was extracted with diethyl ether, dried over magnesium sulfate and filtered, and then the solvent was distilled off. CEP 8.0g was obtained by recrystallizing the obtained solid with methanol.

(6) Production of N-cyclohexyl-5-methylpyrimidinetrione In the same manner as in the production of CEP except that 13.1 g of diethyl methylmalonate was used instead of diethyl ethylmalonate, 8.0 g of purified CMP was obtained. It was.

(7) Production of propionoxyethyl methacrylate 13.0 g (0.1 mol) of hydroxyethyl methacrylate, 13.0 g (0.1 mol) of propionic anhydride, 1 g of paratoluenesulfonic acid, 1 g of hydroquinone monomethyl ether, 200 ml of toluene And reacted at reflux temperature for 2 hours. After the reaction, it was washed with a 5% aqueous sodium carbonate solution, and then the solvent was distilled off to obtain 10 g of HPr.

Example 1
60 parts by mass of AE-1 and 40 parts by mass of ND as a non-acidic radical polymerizable monomer, 5 parts by mass of CMP as a pyrimidinetrione derivative, 3 parts by mass of MDEA as a tertiary amine compound, and MMA-1 as a filler 75 parts by mass, kneaded until uniform, paste A, 60 parts by mass of AE-1 as radical polymerizable monomer and 40 parts by mass of ND, 0.03 parts by mass of CuAc as a copper compound, A paste B was prepared by mixing 1 part by mass of LMAC as an organic chlorine salt compound and 75 parts by mass of MMA-1 as a filler and kneading until uniform. Each physical property was evaluated about these. The results are shown in Table 3.

Examples 2-7, Comparative Examples 1-4
A paste was prepared and evaluated in the same manner as in Example 1 except that the composition of paste A was changed to that shown in Table 1 and that of paste B was changed to that shown in Table 2. The results are shown in Table 3.

Claims (3)

  (1) a non-acidic radical polymerizable monomer, (2) a filler, (3) a pyrimidinetrione derivative, a copper compound soluble in the non-acidic radical polymerizable monomer, and a chemical polymerization initiator comprising an organochlorine salt compound And (4) a curable composition comprising a tertiary amine compound, (A) a paste comprising a non-acidic radically polymerizable monomer, a filler, a pyrimidinetrione derivative, and a tertiary amine compound; (B) A non-acidic radical polymerizable monomer, a filler, and a paste containing a copper compound and an organic chlorine salt compound that are soluble in the non-acidic radical polymerizable monomer are divided until immediately before use. A method for storing a dental curable composition.   (A) a paste comprising a non-acidic radical polymerizable monomer, a filler, a pyrimidinetrione derivative, and a tertiary amine compound; and (B) a non-acidic radical polymerizable monomer, a filler, non-acidic radical polymerizable. A dental curable composition which is divided and stored in a paste containing a copper compound and an organic chlorine salt compound soluble in a monomer, and is used by mixing at the time of use. A denture base lining material comprising the dental curable composition according to claim 2.