JPH0977624A - Dental composite resin - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a dental composite resin easy in handling and of which cured material shows excellent properties by combining a blended filler consisting of a base filler with a specific organic and inorganic composite filler with a polymerizable monomer containing a polymerization initiator. SOLUTION: This dental composite resin is obtained by using a blended filler consisting of a base filler and an organic and inorganic composite filler of which inorganic filler is a synthetic quartz spherical filler synthesized by a vaporized metal conversion method and of which organic filler has >=1.520 refractive index, with a polymerizable monomer containing a polymerization initiator. Further, it is preferable to use the polymerizable monomer having 1.490-1.550 refractive index and its polymerized and cured material having 1.490-1.530 refractive index. The ratio of the components is 10-40 pts.wt. polymerizable monomer and 90-60 pts.wt. blended filler and the weight ratio of the base filler to the organic and inorganic composite filler is (80:20)-(20:80). The polymerized and cured material of the resin has a high mechanical strength and its surface easily finished by grinding, and excellent in esthetic property and surface smoothness, and a small color tone change between before and after its polymerization and curing.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dental composite resin, and more particularly to a dental composite resin which can be used not only as a dental cavity repair material but also as a crown material, artificial tooth or the like. .

[0002]

2. Description of the Related Art Currently, for the repair treatment of tooth defects,
A composite resin in which a polymerizable monomer is mixed with an inorganic filler is used. Particle size of several tens of μm for inorganic filler
A crushed quartz product, a microfiller having a particle diameter of 10 nm to 40 nm, or the like is used. However, when a pulverized quartz product having a particle size of several tens of μm is used, the compounding amount thereof is 70 parts by weight or more in order to obtain appropriate operability of the paste-like polymerized composition before polymerization and curing. The resin has sufficient mechanical strength, surface hardness and low coefficient of thermal expansion, but does not have aesthetic properties such as surface lubricity and abrasion resistance.
In addition, the use of the microfiller having a particle size of 10 nm to 40 nm gives the aesthetics of the composite resin after the polymerization and curing, but its blending is necessary to obtain the appropriate operability of the paste-like polymerizable composition before the polymerization and curing. Since the amount is 60% by weight or less, the mechanical strength of the composite resin after polymerization and curing is poor and the coefficient of thermal expansion is high.

In order to improve the above-mentioned problems, the present inventors have already proposed the vaporized metal conversion (Vapo
has proposed a dental composite resin using a synthetic sphere filler made of synthetic quartz synthesized by the Rized Metal Combustion) method (hereinafter referred to as VMC method) (Japanese Patent Laid-Open No. 6-58242).
-87719, Japanese Patent Application No. 6-255867). The composite resin after polymerization hardening using this synthetic quartz true spherical filler has high mechanical strength, low thermal expansion coefficient, easy surface finish polishing, excellent aesthetics and surface smoothness, and before polymerization hardening. Although the paste-like polymerizable composition (1) has excellent operability that is easy for a dental clinician to handle, it was insufficient in terms of transparency, which is one of the optical characteristics.

In order to improve the above-mentioned problems, the present inventors have found that V. M. C. Average particle size 0.1μ
A synthetic dental composite resin having a transparency of 0.4 to 0.7 before and after polymerization and curing, which uses a synthetic quartz true spherical filler of m to 0.4 μm, has been proposed (Japanese Patent Application No. Hei 7 (1998)).
26425). Although the transparency of the composite resin before and after the polymerization and curing is high, the change in the transparency is large before and after the polymerization and curing, so that the color tone changes remarkably. In addition to transparency, the optical properties required of a dental composite resin include a small change in transparency (change in color tone) before and after polymerization and curing. A variety of pre-prepared color tones are provided to enable dentistry clinicians to use aesthetic restoration to restore the tooth cavity of the patient's tooth cavity, cavities, defects, etc. with a color tone closer to that of a natural tooth using a composite resin. From the paste-like polymerizable composition, one that matches the color tone of natural teeth is selected and used. The refractive index of the polymerizable monomer contained in the paste-like polymerizable composition changes with polymerization and curing, and the refractive index of the cured product obtained by polymerization and curing thereof becomes relatively high. Since the refractive index of the compounded filler is constant, the transparency (color tone) of the composite resin changes before and after polymerization and curing. Therefore, even if a dental clinician visually selects a composite resin paste having a color tone compatible with the patient's natural teeth, the polymerized and cured product cannot have a color tone compatible with the natural teeth.

[0005]

SUMMARY OF THE INVENTION Therefore, the object of the present invention is to solve the above problems, in which the paste-like polymerizable composition before polymerization and curing has excellent operability that is easy for a dental clinician to handle.
The resulting cured polymer has high mechanical strength, is easy to finish and polish the surface, has excellent aesthetics and surface smoothness, has a low coefficient of thermal expansion, is excellent in transparency, and changes in color tone before and after polymerization and curing (transparent The purpose of the present invention is to provide a dental composite resin with little change in sex.

[0006]

As a result of intensive studies conducted by the present inventors in view of the above problems, the present invention can be achieved by the following.

(1) The present invention comprises a polymerizable monomer containing a polymerization initiator and a compounding filler, wherein the compounding filler is
In a dental composite resin comprising a base filler and an organic-inorganic composite filler, the inorganic filler of the base filler and the organic-inorganic composite filler is a vaporized metal conversion (Vaporized MetalCom).
The synthetic silica true spherical filler synthesized by the bustion method, and the organic filler of the organic-inorganic composite filler has a refractive index of 1.520 or more.

(2) In the present invention, the refractive index of the polymerizable monomer is 1.450 to 1.530, and the refractive index of the polymerizable monomer after polymerization and curing is 1.490 to 1.30. The dental composite resin according to (1), wherein the organic filler of the organic-inorganic composite filler has a refractive index of 1.520 to 1.590.

(3) Further, in the present invention, the refractive index of the polymerizable monomer is 1.460 to 1.520, and the refractive index of the polymerizable monomer after polymerization and curing is 1.500 to 1.20. The dental composite resin according to (1), wherein the organic filler of the organic-inorganic composite filler has a refractive index of 1.520 to 1.570.

(4) In the present invention, the polymerizable monomer is 10 to 40 parts by weight, the compounding filler is 90 to 60 parts by weight, and the base filler of the compounding filler and the organic-inorganic are included. Weight ratio with composite filler is 80:
The dental composite resin according to (1) to (3), which is 20 to 20:80.

(5) In the present invention, at least one of the synthetic quartz true spherical filler of the compounded filler and the synthetic quartz true spherical filler which is an inorganic filler of the organic-inorganic composite filler has an average particle size of 0. It is a mixed filler of synthetic quartz true spherical filler having a particle size of 1 μm to 0.4 μm and an average particle size of 0.5 μm to 2 μm, and the weight ratio thereof is 100: 0 to 20:80.
The dental composite resin according to (1) to (4) above.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION The dental composite resin of the present invention will be described in detail below.

As the polymerization initiator used in the present invention, known ones generally used in dental materials can be used. Examples of the polymerization initiator include organic peroxides such as benzoyl peroxide (hereinafter referred to as BPO), organic peroxides such as BPO and tertiary amines such as N, N-dimethyl-p-toluidine, and camphorquinone ( Hereinafter referred to as CQ)
And a tertiary amine such as p-tolyldiethanolamine, p-dimethylaminobenzaldehyde, 2-dimethylaminoethyl methacrylate (hereinafter referred to as DMAEMA), and the like. Further, other additives can be added if necessary. These additives include radical polymerization inhibitors, coloring pigments, ultraviolet absorbers and the like.

As the polymerizable monomer used in the present invention, known compounds generally used in dental composite materials can be used. The most typical polymerizable monomer is a polymerizable monomer having an acrylic group and / or a methacrylic group. Specifically, bisphenol A-glycidyl methacrylate adduct (Bis-GM
A), 2,2-bis (4- (methacryloxyethoxy)
Phenyl) propane (D2.6E), 2,2-bis (4
-(Methacryloxydiethoxy) phenyl) propane (D4E), ethylene glycol dimethacrylate (1
G), triethylene glycol dimethacrylate (3
G), urethane dimethacrylate (UDMA), tetrafunctional urethane methacrylate (SH560), hexafunctional urethane methacrylate (U6H), trimethylolpropane trimethacrylate (TMPT), methyl methacrylate (MMA), lauryl methacrylate (LMA).
And the like. Since these polymerizable monomers are known as dental materials, one or a mixture of two or more can be used. From the viewpoint of mechanical strength, a mixture of urethane dimethacrylate (UDMA) and triethylene glycol dimethacrylate (3G) satisfying the above refractive index conditions is particularly preferable. Further, in the present invention, the refractive index measured at 25 ° C. with an Abbe refractometer is 1.450 to 1.530 for the polymerizable monomer, and 1 for the cured product of the polymerizable monomer after polymerization and curing. .490
It is preferable to mix them at a ratio of about 1.550 to 1.550, particularly preferably 1.460 to 1.520 as a polymerizable monomer,
And 1.50 after curing of the polymerizable monomer.
It is mixed at a ratio of 0 to 1.530.

The synthetic quartz true spherical filler used in the present invention is V.V. which is a gas phase reaction using metallic silicon powder as a raw material. M.
C. It was synthesized by the method. The surface of the filler is generally surface-treated with an organic silicon compound such as γ-methacryloxypropyltrimethoxysilane (hereinafter referred to as γ-MPS) and γ-methacryloxypropyltriisocyanate (coupling). Optimal agent utilization technology [Published by Chemical Technology Research Institute]). The conditions and method for the surface treatment are not limited, and known conditions and methods can be used.
Particularly preferable surface treatment conditions and methods include those proposed by the present inventors (Japanese Patent Laid-Open No. 6-88039).

The organic-inorganic composite filler (hereinafter referred to as composite filler) comprising an organic filler and an inorganic filler used in the present invention is a polymerizable monomer in which a polymerization initiator is dissolved and suitable conditions and methods. The paste composition obtained by mixing the inorganic filler surface-treated with is polymerized and cured by light, heating or chemical polymerization, and the cured product is crushed by a ball mill, a vibration mill, a vibration ball mill or a jet crusher. Then
Obtained by classification with a sieve or an air classifier.
The particle size of the composite filler is 10 μm to 100 μm, especially 20 μm.
It is preferable that the particle size is m to 50 μm, and if the particle size is 10 μm or less, the filling rate of the filler becomes low and the mechanical strength such as bending strength becomes low. The particle size is 100 μm
If the content is higher than the above, the filling rate of the filler becomes high, but the mechanical strength such as bending strength is lowered because the concentration of external force is likely to occur, and the paste before curing cannot have uniform properties. Further, as the polymerization initiator and the polymerizable monomer used here, those as described above can be used, but in the present invention, the polymerizable monomer is polymerized and cured, the organic filler of the composite filler Material Abbe refractometer at 25 ℃
The refractive index measured in 1. is preferably 1.520 to 1.590, and particularly preferably 1.520 to 1.90.
570. A plurality of composite fillers having an organic filler within the above refractive index range may be mixed and used.

Examples of the inorganic filler used in the present invention include the above-mentioned V. M. C. It is a synthetic quartz true spherical filler synthesized by the method. Further, the surface of the composite filler is subjected to the suitable surface treatment as described above for the purpose of improving mechanical strength and water resistance.

In the present invention, the compounding ratio of the polymerizable monomer containing the above-mentioned polymerization initiator and the compounding filler composed of the synthetic quartz true spherical filler and the composite filler is the polymerizable monomer. Is 10 to 40 parts by weight, the compounding filler is 90 to 60 parts by weight, and the weight ratio of the synthetic quartz true spherical filler to the composite filler is 80:20 to.
It is preferably 20:80, particularly 60:40 to 40:60. For example, a paste containing a large amount of synthetic quartz true spherical filler outside the range of this ratio is inadequate in terms of operability due to a sticky property, and a paste-like polymerizable composition containing a large amount of composite filler is polymerized. The cured product is inferior in mechanical strength because the filling rate of the filler is lowered,
The coefficient of thermal expansion becomes high.

In the present invention, from the viewpoint of transparency and mechanical strength, the synthetic quartz true spherical filler used as the inorganic filler of the base filler and the composite filler has an average particle diameter of 0.1 μm to
0.4μm synthetic quartz spherical filler and average particle size 0.5μ
The weight ratio of the synthetic quartz true spherical filler of m to 2 μm is 10
It is preferably 0: 0 to 20:80, particularly preferably 100: 0 to 40:60. For example, outside the range of this ratio, a paste-like polymerizable composition using only synthetic quartz true spherical fillers having an average particle size of less than 0.1 μm becomes sticky and thus has poor operability. Further, the average particle size is 0.
The paste-like polymerizable composition using only a synthetic quartz true spherical filler having a size of 5 μm to 2 μm and the cured product obtained by polymerizing and curing the same are high in mechanical strength but low in transparency.

In the present invention, the refractive index of the polymerizable monomer, the refractive index of a cured product obtained by polymerizing and curing the polymerizable monomer,
The refractive index of the organic filler of the composite filler is an important factor. In order to reduce the change in transparency (change in color tone) before and after the polymerization, the refractive index of the polymerizable monomer is 1.450 to 1.53.
0, the refractive index of the cured product obtained by polymerizing and curing the polymerizable monomer is 1.490 to 1.550, and the organic filler of the composite filler preferably has a refractive index of 1.520 to 1.590. Particularly preferably, the refractive index of the polymerizable monomer is 1.4.
60 to 1.520, the refractive index of the cured product obtained by polymerizing and curing the polymerizable monomer is 1.500 to 1.530, and the organic filler of the composite filler has a refractive index of 1.520 to 1.570. The refractive index of the polymerizable monomer contained in the paste-like polymerizable composition changes with the polymerization and curing, and the refractive index of the cured product obtained by the polymerization and curing becomes relatively high. Therefore, it is used as an inorganic filler for base filler and composite filler,
It seems that the difference in the refractive index with the synthetic silica true spherical filler, which is an amorphous silica with a refractive index of about 1.450, becomes large and the transparency decreases, but at the same time, the refractive index with the organic filler of the composite filler increases. Therefore, the change in transparency before and after the polymerization is small as a whole.

[0021]

EXAMPLES The present invention will be described in more detail with reference to Examples and Comparative Examples, but the present invention is not limited thereto. In the following Examples and Comparative Examples, organic-inorganic composite filler, composite resin paste and a method for producing a polymerized cured product thereof, measurement of bending strength before and after boiling deterioration acceleration test, measurement of filler filling rate, of refractive index The measurement, the transparency before and after polymerization and curing, and the evaluation by the change in transparency before and after polymerization and curing were evaluated according to the following methods.

(1) Method for producing organic-inorganic composite filler BPO as a polymerization initiator was dissolved in a polymerizable monomer in an amount of 0.5% by weight to prepare an organic filler having a predetermined refractive index. The polymerizable monomer was thoroughly mixed with a synthetic quartz spherical filler whose surface was treated with γ-MPS at a predetermined weight concentration with respect to the filler, and then degassed in vacuum to prepare a paste-like polymerizable composition. . The paste-like polymerizable composition was sandwiched between glass plates, and heat-treated at 130 ° C. for 1 hour to polymerize and cure to prepare a cured product. The cured product is crushed with a ball mill (Fritsch) and sieved to 20μ.
Particles of m to 50 μm were classified and collected. Further, the filler was surface-treated with 2% by weight of γ-MPS to prepare a composite filler composed of an organic filler having a predetermined refractive index and an inorganic filler which is a synthetic quartz true spherical filler.

(2) Method for preparing composite resin paste CQ (photosensitizer) and DMAEMA (reducing agent) as polymerization initiators are dissolved in a polymerizable monomer in an amount of 1% by weight each to have a predetermined refractive index. A certain polymerizable monomer and a compounded filler composed of a synthetic quartz spherical filler whose surface was treated with a predetermined weight concentration of γ-MPS and a composite filler prepared in (1) were sufficiently mixed. Then, vacuum degassing was performed to prepare a paste-like polymerizable composition.

(3) Measurement of Bending Strength Before and After Boiling Degradation Acceleration Test The paste-like polymerizable composition prepared in (2) was injected into a hollow tube having an inner diameter of 3 mm fixed in a glass tube, and commercially available for dental use. Light was irradiated with a visible light irradiator (produced by GC) for 5 minutes to polymerize and cure, and a columnar cured product with a diameter of 3 mm taken out from the tube was used as a bending test piece. 3
Autograph AGS-10 after being kept in 7 ° C water for 24 hours
Using 0 (manufactured by Shimadzu Corporation) as a measuring device, a three-point bending test was carried out at a fulcrum distance of 20 mm and a crosshead speed of 2 mm / min to measure bending strength. Further, the bending strength of the test piece immersed in boiling water for 24 hours (boiled deterioration acceleration test) was also measured.

(4) Measurement of Filler Filling Ratio About 0.5 g of a cured product obtained by polymerizing and curing the paste-like polymerizable composition prepared in (2) with a commercially available dental visible light irradiator (manufactured by GC) is 600. It was ashed by holding it in an electric furnace at 30 ° C. for 30 minutes, and the residue was weighed to calculate the filler filling rate (wt%) using the following formula. Filler filling rate [wt%] = (residue [g] / cured product [g]) × 100 (5) Measurement of refractive index The refractive index at 25 ° C. was polymerized using an Abbe refractometer (manufactured by Atago Co.). Of the polymerizable monomer, the cured product obtained by polymerizing and curing the polymerizable monomer, and the cured product obtained by polymerizing and curing the polymerizable monomer used for the organic filler of the composite filler.

(6) Measurement of transparency (ΔL) and change in transparency (Δ (ΔL)) before and after polymerization and curing The paste-like polymerizable composition prepared in (2) was 0.8 mm in thickness and 20 m in inner diameter.
It was filled in a circular spacer of m and sandwiched between the upper and lower sides by glass plates to obtain a sample. This sample is placed on a standard white board and a standard blackboard, and a color value (Lab,
Brightness: L value) was measured. Next, this sample was irradiated with a commercially available dental visible light irradiator (produced by GC) for 5 minutes to polymerize and cure, and then the same measurement was performed. The Lw value and the Lb value when a standard white plate and a standard blackboard were placed behind each sample, and the difference ΔL in lightness between them was determined and used as the transparency (ΔL = Lw−Lb). The larger the value, the higher the transparency of the sample. Further, the difference | Δ (ΔL) | between the transparency ΔLp of the paste-like polymerized composition and the transparency ΔLc of the cured product obtained by polymerization and curing was determined and used as the change in transparency before and after polymerization and curing. It should be noted that the smaller this value is, the smaller the change in transparency before and after the polymerization and curing is.

(Example 1) Regarding the composite filler, 6% by weight of γ-M with respect to the filler was used according to the method of the above (1).
Synthetic quartz true spherical filler SO-C surface treated with PS
1 (Admafine, 0.2 μm, manufactured by Admatechs) was mixed with 78 parts by weight and 22 parts by weight of a polymerizable monomer D2.6E (manufactured by Shin-Nakamura Chemical Co., Ltd.) containing BPO as a polymerization initiator, and refracted. A composite filler made of an organic filler having a ratio of 1.568 and an inorganic filler of synthetic quartz true spherical filler SO-C1 was prepared. Next, according to the method of the above (2), a synthetic quartz true spherical filler SO-C1 surface-treated with 6% by weight of γ-MPS with respect to the filler and the composite filler
86.5 parts by weight of a compounded filler mixed in a weight ratio of 0:40, a polymerization initiator CQ and DMAEMA, a refractive index of 1.478, and a cured product of the cured product having a refractive index of 1 A mixture of UDMA and TEGDMA of 0.510 (weight ratio UDMA: TEGDMA = 80: 20, all manufactured by Shin-Nakamura Chemical Co., Ltd.) was mixed at 13.5 parts by weight to prepare a paste-like polymerizable composition. The operability of the obtained paste was good, and the bending strength before and after the boiling deterioration acceleration test of the polymerized cured product, the filling rate of the filler, the transparency before and after the polymerization curing, and the change in the transparency before and after the polymerization curing were measured. The results are shown in the table.

(Example 2) According to the method of (1) above, 78 parts by weight of synthetic silica true spherical filler SO-C1 surface-treated with 6% by weight of γ-MPS to the filler, BPO as a polymerization initiator. A mixture of SH560, TMPT, U6H and 1G containing SH560: TMPT: U6 in a weight ratio.
H: 1G = 15: 40: 30: 15, all manufactured by Shin-Nakamura Chemical Co., Ltd.) in an amount of 22 parts by weight, and an organic filler having a refractive index of 1.515 and a synthetic quartz true spherical filler SO-C1 inorganic A composite filler made of a filler was produced. As the composite filler, a paste-like polymerizable composition was used in the same manner as in Example 1 except that the composite filler prepared in Example 1 and the composite filler prepared in this example were mixed at a weight ratio of 50:50. The thing was prepared. The operability of the obtained paste was good, and the bending strength before and after the boiling deterioration acceleration test of the polymerized cured product, the filling rate of the filler, the transparency before and after the polymerization curing, and the change in the transparency before and after the polymerization curing were measured.
The results are shown in the table.

Example 3 6% by weight of γ with respect to the filler
-Synthetic quartz spherical filler SO surface-treated with MPS
-C1 and a synthetic quartz true spherical filler SO-C2 (Admafine, 0.5 μm, manufactured by Admatex) surface-treated with 3% by weight of γ-MPS with respect to the filler 67:
A synthetic quartz true spherical filler mixed in a weight ratio of 33 and 89 parts by weight of a compounded filler in which the composite filler used in Example 2 was mixed in a weight ratio of 60:40, and CQ and DMAEMA as polymerization initiators were added. U having a refractive index of 1.478 and a cured product of the cured product thereof having a refractive index of 1.510.
Mixture of DMA and TEGDMA (weight ratio UDMA: T
EGDMA = 80: 20, all made by Shin Nakamura Chemical Co., Ltd.) 11
The mixture was mixed in parts by weight to prepare a paste-like polymerizable composition.
The operability of the obtained paste was good, and the bending strength before and after the boiling deterioration acceleration test of the polymerized cured product, the filling rate of the filler, the transparency before and after the polymerization curing, and the change in the transparency before and after the polymerization curing were measured. The results are shown in the table.

Example 4 A mixture of 86 parts by weight of the same filler as in Example 1, CQ and DMAEMA as polymerization initiators, a refractive index of 1.512, and a cured product after polymerization and curing thereof D2.6E and TEG with a rate of 1.533
Mixture of DMA (weight ratio D2.6E: TEGDMA =
75:25, all manufactured by Shin-Nakamura Chemical Co., Ltd.) 14 parts by weight were mixed to prepare a paste-like polymerizable composition. The operability of the obtained paste was good, and the bending strength before and after the boiling deterioration acceleration test of the polymerized cured product, the filling rate of the filler, the transparency before and after the polymerization curing, and the change in the transparency before and after the polymerization curing were measured. The results are shown in the table.

Comparative Example 1 78 parts by weight of synthetic silica true spherical filler SO-C1 surface-treated with 6% by weight of γ-MPS was used according to the method of (1) above, and BPO as a polymerization initiator. A mixture of TMPT and 1G containing (in weight ratio TMPT: 1G = 50: 50, all manufactured by Shin Nakamura Chemical Co., Ltd.)
Was mixed in an amount of 22 parts by weight to prepare a composite filler composed of an organic filler having a refractive index of 1.509 and an inorganic filler of synthetic quartz true spherical filler SO-C1. A paste-like polymerizable composition was prepared in the same manner as in Example 1 except that this composite filler was used as the composite filler. The operability of the obtained paste was good, and the bending strength before and after the boiling deterioration acceleration test of the polymerized cured product, the filling rate of the filler, the transparency before and after the polymerization curing, and the change in the transparency before and after the polymerization curing were measured. The results are shown in the table.

(Comparative Example 2) A mixture of 86 parts by weight of the same filler as in Example 1, CQ and DMAEMA as polymerization initiators, a refractive index of 1.541, and a cured product after polymerization and curing A paste-like polymerizable composition was prepared by mixing 14 parts by weight of D2.6E (manufactured by Shin-Nakamura Chemical Co., Ltd.) having a rate of 1.568. The operability of the obtained paste was good, and the bending strength before and after the boiling deterioration acceleration test of the polymerized cured product, the filling rate of the filler, the transparency before and after the polymerization curing, and the change in the transparency before and after the polymerization curing were measured. The results are shown in the table.

[0033]

【table】

[0034]

As described above, by setting the refractive index of the organic filler of the organic-inorganic composite filler to 1.520 or more, the refractive index of the polymerizable monomer is further increased from 1.450 to 1.50.
By setting 1.530 and the refractive index of the polymerizable monomer after polymerization and curing to 1.490 to 1.550, it has excellent operability, high mechanical strength, and easy finish polishing of the surface. It has excellent aesthetics and surface smoothness, and has a low coefficient of thermal expansion.
It is possible to obtain a dental composite resin having excellent transparency and having a small change in color tone (change in transparency) before and after polymerization and curing.

Claims (5)

[Claims] 1. A dental composite resin comprising a polymerizable monomer containing a polymerization initiator and a compounding filler, wherein the compounding filler comprises a base filler and an organic-inorganic composite filler. -The inorganic filler of the inorganic composite filler is vaporized metal
1. A dental composite resin, which is a synthetic quartz true spherical filler synthesized by a conversion (Vaporized Metal Combustion) method, wherein the organic filler of the organic-inorganic composite filler has a refractive index of 1.520 or more. 2. The refractive index of the polymerizable monomer is 1.450 to.
1.530, the refractive index of the polymerizable monomer after polymerization and curing is 1.490 to 1.550, and the organic filler of the organic-inorganic composite filler has a refractive index of 1.520 to 1.59.
The dental composite resin according to claim 1, wherein the composite resin is 0. 3. The refractive index of the polymerizable monomer is 1.460 to.
1.520, the refractive index of the polymerizable monomer after polymerization and curing is 1.500 to 1.530, and the refractive index of the organic filler of the organic-inorganic composite filler is 1.520 to 1.57.
The dental composite resin according to claim 1, wherein the composite resin is 0. 4. The polymerizable monomer is 10 to 40 parts by weight, the compounding filler is 90 to 60 parts by weight, and the weight ratio of the base filler to the organic-inorganic composite filler of the compounding filler is The dental composite resin according to any one of claims 1 to 3, which is 80:20 to 20:80. 5. An average particle size of 0.1 μm to 0.4 μm in at least one of the synthetic quartz true spherical filler of the compounded filler and the synthetic quartz true spherical filler which is an inorganic filler of the organic-inorganic composite filler. Average particle size 0.5 μm to 2 μm
5. The dental composite resin according to any one of claims 1 to 4, which is a mixed filler of the synthetic quartz true spherical filler of 1) and has a weight ratio of 100: 0 to 20:80.