JPH0227961B2 - - Google Patents

Description

[Detailed description of the invention]

INDUSTRIAL APPLICATION FIELD OF THE INVENTION The present invention relates to a method of using a dental hard resin composition in the production of inlay bodies and denture bases. BACKGROUND OF THE INVENTION Conventional inlay materials for filling cavities from tooth cavities include composites, silver amalgams, and metals. Composites have low crushing drag;
They also often separate from the filled cavity. This is because there is a gap between the cavity and the filling. Therefore, many scholars are currently reporting cases in which secondary caries occurred due to moisture and food residue entering the container within a short period of time after filling, and residual monomer remaining. Silver amalgam and metals have the disadvantage that their color tone does not match natural teeth and impairs their aesthetic appearance. Furthermore, in order to manufacture a metal inlay body, a wax pattern is created, metal is cast using an investment material, etc., and further polishing is performed, so it takes a long time to form the body. Additionally, conventional denture bases use a mixture of methacrylate monomers, methacrylate polymers, and pigments. This mixture requires very long heating times to cure and reduce residual monomer. Furthermore, the strength of the molded product is not sufficient, and the portion of the denture base that touches the jaw may be made of metal, which impairs the aesthetic appearance and places a psychological burden on the patient. Problems to be Solved by the Invention In order to improve the drawbacks that the conventional inlay bodies and denture bases mentioned above require a long time to manufacture and do not have sufficient strength, the present inventors have developed a methacrylic material. A dental hard resin composition consisting of an acid ester monomer or methacrylic acid ester monomer and its polymer, silicon dioxide, and an organic peroxide is used, and microwaves of 2000 to 3000 MHz are used for curing and molding. This is an attempt to solve the problem. Means for Solving the Problems The dental hard resin composition used in the present invention is
30-70% by weight of methacrylic acid ester monomer, 0-30% by weight of methacrylic ester polymer, 30-70% by weight of silicon dioxide, 0.3-3.5% by weight of organic peroxide, and 0 silicon dioxide surface treatment agent. ~5% by weight
or, if necessary, a small amount of pigment may be mixed in to match the color of the patient's natural teeth. Examples of methacrylic acid ester monomers include bisphenol A glycidyl methacrylate (hereinafter abbreviated as BisGMA), triethylene glycol. Dimethacrylate (hereinafter abbreviated as 3G), 2.2 bis

[4-(Methacroxyethoxy)
Phenyl] propane (hereinafter abbreviated as D-2.6E), polymethyl methacrylate, diethylene glycol dimethacrylate, tetramethylol triacrylate, tetramethylolmethane trimethacrylate, trimethylolethane trimethacrylate, methyl methacrylate, etc. can be used. As the methacrylic acid ester polymer, polymethyl methacrylate, polyethyl methacrylate, polymers and copolymers of the above-mentioned methacrylic acid ester monomers, etc. can be used. As silicon dioxide, γ-methacryloxy,
Quartz powder surface-treated with propyltrimethoxysilane, amorphous asto silica (manufactured by Aerosil), etc. can be used. Further, as a surface treatment agent, a silane coupling agent such as γ-methacryloxypropyltrimethoxysilane can be used. The silicon dioxide is used to make the composition into a paste and to provide hardness and strength to the formed inlay and denture base. As the organic peroxide, for example, benzoyl peroxide is used. When only the methacrylic acid ester monomer is treated with a high frequency of 2000 to 3000 MHz (hereinafter referred to as microwave), the surface of the cured resin remains unreacted. A composition mixed with an organic peroxide is completely converted into a resin. This is thought to be because the polymerization curing reaction is carried out more strongly due to the exothermic action of microwaves and the action of active radicals generated by the decomposition of the organic peroxide by the heat. The dental hard resin composition used in the present invention is heated by microwaves, and even thick compositions are completely polymerized and cured in several minutes, giving molded products with high strength. Next, the method of using the dental hard resin composition for an inlay body is to take an impression of a tooth with caries removed, make a plaster model from this impression, and then place an inlay body of the composition on it. and cure the composition by microwave treatment for several minutes. The hardened inlay body is bonded to the tooth cavity with dental cement. Traditional composites used for inlay bodies are
The crushing force measured after 1 and a half hours of curing was 215Kgf/
^cm2 , but the crushing force of the inlay body according to the method of the present invention when treated with microwaves for 5 minutes is 300Kg.
f/cm ² and there is no residual monomer. Furthermore, the inlay body adhered to the cavity by the method of the present invention does not fall off, and the color tone can be adjusted to match the patient's natural teeth by mixing pigments in the composition, so the aesthetic appearance will not be impaired. do not have. Furthermore, inlay bodies according to the method of the invention can be produced in a short time. Next, the method of using the composition for a denture base is as follows:
An impression of the area to be treated is taken, a plaster model is made from the impression, and a denture base is formed on the impression with a pigment mixed to match the color of the patient's gums and jaw area. A suitable denture is fixed to the wax ridge and treated with microwaves for several minutes to create a strong denture base to which the denture is attached. Since the denture base produced by the method of the present invention has high strength, the jaw portion thereof can be formed relatively thin, is lightweight, and has a good feel when attached to the oral cavity. The composition of the present invention and its method of use will now be explained by way of examples. Example 1 Parts by weight BisGMA 70 3G 30 Fused silica powder (10μ or less) 100 Polymethyl methacrylate (50μ or less) 50 Benzoyl peroxide 1 For an inlay body, 1 part by weight of pigment is mixed with the above composition to form a paste composition. was manufactured. An impression of the tooth with the carious area removed was taken, a plaster model was made from this impression, the cavity was filled with the composition, and the inlay body was prepared by treating with microwaves in an electronic resin for 5 minutes. When this inlay body was bonded to the tooth cavity with dental cement, it had the same color as a natural tooth and was firmly bonded to the cavity. In the case of a denture base, 2 parts by weight of pigment was mixed with the above composition to produce a paste composition. An impression of the area to be treated is taken, a plaster model is made based on the impression, the composition is placed thereon to form a denture base, the denture is fixed to the wax ridge part of the denture base, and the denture is placed in a microwave oven. After 7 minutes of microwaving, a strong denture base that firmly held the denture was obtained. Example 2 Parts by weight D-2・6E 70 3G 30 Benzoyl peroxide 1 Quartz (silane treatment agent) 200 Surface treatment agent 1 Using the above composition, an inlay body and a denture base were manufactured in the same manner as in Example 1. did. In all cases, products were obtained that had greater strength than conventional products and did not impair aesthetic appearance. Example 3 Parts by weight D-2・6E 70 3G 30 Benzoyl peroxide 1 Amorphous asto silica (R972 manufactured by Aerosil)
100 An inlay body and a denture base were manufactured in the same manner as in Example 1 using the composition having the above composition. In all cases, products were obtained that had greater strength than conventional products and did not impair aesthetic appearance. Effects of the Invention The dental hard resin composition of the present invention can be used in a shorter period of time using microwaves, compared to the conventional curing method using a flask method, a polymerization pot, or other heat polymerization methods. The cured product can be completely cured in a short period of time and has better mechanical and physical properties than conventional products. Therefore, since the above-mentioned hard resin composition is used and microwaves are used to harden the composition in the manufacturing process of the inlay body and denture base, it is possible to use a household microwave oven as a manufacturing device, and it is inexpensive. It is possible to obtain a product that takes less time to produce, has greater strength, and does not impair its aesthetic appearance. Additional Relationships The invention of original patent No. 1469528 (Japanese Patent Publication No. 17804/1986) provides that when a hard dental resin composition comprising an acrylic monomer, silicon dioxide, and an organic peroxide is used for forming dentures, This relates to a method of curing and molding by treating with microwaves. The main part of the present invention is to cure a composition consisting of a methacrylic acid ester monomer or a methacrylic acid ester monomer and its polymer, silicon dioxide, and an organic peroxide using microwaves. The composition is used for manufacturing inlay bodies and denture bases, and falls under Article 31, Paragraph 1 of the Patent Law.

Claims (1)

[Claims] 1. A dental hard resin composition consisting of a methacrylic acid ester monomer or a methacrylic acid ester monomer, a methacrylic acid ester polymer, silicon dioxide, and an organic peroxide is used in the production of inlay bodies and denture bases. During the process, the composition is
A method of using a dental hard resin composition characterized by curing and molding with microwaves at a high frequency of ~3000MHz.