JPS6150906A - Dental adhesive - Google Patents

Abstract

PURPOSE:To provide a dental adhesive containing methylene chloride and a polycarbonate resin at a specific ratio, and capable of bonding a dental polysulfone resin extremely firmly to a dental acrylic resin. CONSTITUTION:(A) A dental polysulfone resin for denture base, having the structure of formula I, formula II, etc. and having high strength and excellent impact resistance but poor adhesivity to acrylic resin, is bonded with (B) a dental acrylic resin for artificial tooth, etc., by using a dental adhesive containing (C) 100pts.wt. of methylene chloride and (D) 0.3-20pts.wt., preferably 0.5-15pts.wt. of a polycarbonate resin. an extremely high adhesive strength between A and B can be attained by the adhesive. The component C has low boiling point and rapid dryability, is applicable to the resin A without causing cracks, is a good solvent of the component D to enable the preparation of homogeneous solution, and has excellent affinity to the resin B and high safety.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application □ The present invention relates to an adhesive for bonding a dental polysulfone resin and a dental acrylic resin.

BACKGROUND OF THE INVENTION Conventional dental prostheses made of resin have been produced using acrylic resins for many years by pressure molding by heating and polymerizing polymers and monomers. This has the advantage that repairs are easy because the same 7-acrylic polymer powder and 7-acrylic monomer liquid are used as the repair materials.

However, Tζ dental prostheses obtained by heating polymerization of such acrylic resins are brittle, and the thin portions often break due to occlusal force, which is a strength disadvantage, and the heating polymerization reaction is often insufficient. Therefore, if the residual monomer is eluted and causes allergic symptoms, it also has a hygienic drawback.

However, artificial teeth made of acrylic resin also have the disadvantage of being easily abraded by toothbrushes.

Dental prosthetics made of polysulfone resin have been proposed to eliminate these drawbacks of dental prosthetics made of acrylic resin, and have come into practical use.This polysulfone resin is a unique engineering plastic. Although it has high mechanical strength and excellent impact resistance, it has poor adhesion with the commonly used acrylic resin artificial teeth, so it is difficult to use special retaining devices or ordinary adhesives. However, the adhesion is insufficient, and there are practical problems such as the fact that the artificial teeth tend to come off when biting into relatively hard food, for example.

So-called rebase agents such as acrylic resin hard lining agents and temporary lining agents used for adjusting the wall thickness of the mouth part of acrylic resin denture bases 8. Bossalphone resin dental prostheses The actual situation is that even if it is applied to a material, sufficient adhesion cannot be obtained and it cannot be put to practical use.

Problems to be Solved by the Invention The object of the present invention is to provide a dental adhesive capable of firmly bonding a dental polysulfone resin and a dental acrylic resin. That is, a polysulfone resin denture base and an acrylic resin artificial tooth, a polysulfone resin denture base and an acrylic resin rebase agent,
The present invention provides an adhesive that firmly adheres an acrylic resin 89 tooth base to an artificial tooth made of polysulfone resin, and dramatically expands the range of its practicality.

Means for Solving the Problems The present invention is characterized in that the adhesive used to bond the dental polysulfone resin and the dental acrylic resin is made of methylene chloride and a polycarbonate resin; This dental adhesive contains 0.8 to 20 Mflk parts of polycarbonate resin based on parts by weight.

The polycarbonate resin used in the present invention is 4.
4-dioxydiallylphurcan-based polycarbonate, such as bis(4-hydroxyphenyl)methane,
Bis(4-hydroxyphenyl)ethane, 2.2-his(4-hydroxyphenyl)propane, bis[4-hydroxy-8,5-dichlorophenyl]methane, 2.2-
It is obtained from 4,4-dioxydiphenylalkanes such as bis(4-hydroxy-8,5-dimethylphenyl)propane and bis[4-hydroxyphenyl]phenylmethane and phosgene or diphenyl carbonate. Such polycarbonates can be produced by various methods already known, such as melt polymerization, liquid-liquid polymerization, and interfacial polymerization.

The methylene chloride used in the present invention has the chemical formula CH2
It is represented by C/2 and is also called methylene dichloride or dichloromethane. It is a colorless liquid with a melting point of -97°C and a boiling point of 40°C.

In the present invention, the content of polycarbonate resin in methylene chloride is suitably 0.8 to 20 parts by weight per 100 parts by weight of methylene chloride.

If the polycarbonate resin is less than 0.8311 iffi parts per 100 parts of methylene chloride, the adhesion between the dental polysulfone resin and the dental acrylic resin will not be sufficient, and the content of the polycarbonate resin will be 20 parts by Tf. Exceeding this is not preferable because the viscosity of the solution is too high and uniform application is difficult. Furthermore, when the content of the polycarbonate resin is 0.6 to 15 parts by weight, it is preferable because it provides well-balanced properties in terms of workability during adhesion, drying efficiency, adhesion strength, etc.

Polymethyl methacrylate (hereinafter referred to as F M M
(abbreviated as “person”), methyl methacrylate monomer (hereinafter referred to as “MM”)
A and T] can be blended in appropriate amounts depending on the purpose.

For example, when using the polycarbonate resin/methylene chloride solution to bond a polysulfur denture base and an acrylic resin rebase agent, if an appropriate amount of PMMA is added to the solution, stronger adhesion can be achieved. When blended with rubber, the bonded area and its periphery are given gloss and a more attractive appearance can be obtained.

The polycarbonate resin/methylene chloride solution used in the present invention may contain conventional additives such as coloring agents such as dyes and pigments, ultraviolet absorbers, and stabilizers, to the extent that the purpose of the present invention is not impaired. 181 or more kernels can be added.

In addition, the dental polysulfone resin referred to in the present invention is 7
It refers to polyarylethyl ether borisulfo in which lylene units are located randomly or orderly together with ether and sulfone bonds, for example, υCC polysulfone Udel IC with the CH2 structure.
I made oy holier-f le+ /L/*:/Vic
This refers to resins and powders with excellent hygiene that can be used as dental prostheses, including trex■, etc.

The dental acrylic resin used in the present invention refers to an acrylic resin used as a dental prosthesis, such as a homopolymer of MM (PMM) or a copolymer with other methacrylate such as butyl methacrylate.

The method of bonding dental polysulfone resin and dental acrylic resin with the adhesive of the present invention is not particularly limited. For example, the adhesive of the present invention is applied to one or both adherend surfaces, air-dried for a few seconds to several minutes, then both adherend surfaces are brought together, lightly pressed, and then heated to 10-100°C at around 80°C.
How to perform heat treatment for about minutes, polysal resin l!
! It is possible to overuse any method such as applying the adhesive of the present invention on the dental prosthesis, air-drying it, and then applying a commercially available acrylic resin adhesive base.

How it works When a solution of methylene chloride of polycarbonate resin is interposed at the adhesion interface of polysulfone resin and acrylic resin, and the solvent is removed by air drying or moderate heat treatment, surprisingly strong adhesion is achieved. Provides strength.

This is polycarbonate resin, polysulfone resin,
Although it has an essential molecular structure difference from acrylic resins, it has a relatively high affinity for both polysulfone resins and acrylic resins, and a good dispersion state close to the molecular level can be achieved at the adhesive interface. It is presumed that the

Furthermore, methylene chloride has a low boiling point and dries quickly, so it does not cause cracks even when applied to dental polysulfone resin.

It is a good solvent for polycarbonate resins, allows for the preparation of uniform melts, and also has good affinity with dental acrylic resins. Furthermore, it has good safety and hygiene characteristics among chlorinated solvents.

Hereinafter, the present invention will be specifically explained with reference to Examples, but these are illustrative of preferred embodiments, and the present invention is not limited to the scope of the Examples.

Example 1 According to the artificial tooth fracture test method described in Japanese Industrial Standards JI8 T-6511, an acrylic resin artificial tooth (GC acrylic resin front #1) l was placed between the incisal end 1' and It was planted on a paraffin wax model so that the line connecting the tooth neck 1' was at an angle of 45° with the paraffin wax master, and after embedding plaster in a flask, it was poured with wax to form a plaster mold.

Attach this gypsum to an injection molding machine, set the cylinder temperature to 850℃ and the injection pressure to 1500℃ @/cs
2. Under the conditions of injection m [200 M/sec (molding machine: Sumitomo Nestal P40725), molten resin of polysulfone resin colored like gums (Udel P-1700 manufactured by UCC!) was injected into the flask.

After cooling, the flask was divided into parts, and molded articles for artificial tooth fracture testing were taken out. When the artificial tooth was pulled strongly by hand, it came off from the molded product. Apply a solution consisting of 100M methylene chloride nail part and 10 parts polycarbonate resin (Mitsubishi Gas Chemical Kneepilon 82000) to the hollow part of the artificial tooth, and after air-drying for a few seconds, remove the acrylic resin first. The prepared artificial tooth was then placed and lightly pressurized. After that 80
Heat treatment for 40 minutes in a hot air drying oven at ℃.

The resin bed part 2 of the obtained fco molded product was fixed with a holder 8 as shown in FIG. Ta.

The fracture strength was 21 Kqf, a sufficiently high value that would not cause problems with English soil.

Comparative Example 1 In the same manner as in Example 1, polysulfone resin was injected into a flask, and after cooling, the flask was divided, and the molded article for the artificial meat fracture test was taken out, and a real demon example was prepared without any treatment. Perform the same fracture test as in 1.

The fracture strength was only rKfr, and only showed a low value that would pose a problem in practical use.

Practical example 2 Acrylic resin artificial teeth (trade name: GC 7 Krylic Resin anterior teeth and molars) were implanted and a denture base wax model was embedded in the flask.The flask was heated to soften the wax and form a plaster mold. I let it happen. After that, Polynee t#f, 1zxh (Victrex manufactured by IOI)
■ A colored gingiva-like molded product of 4100G (U-shaped with a size that parallels the alveolar ridge) was placed on the plaster mold in the lower flask and blown with hot air at 350°C. The molded product was softened for 7'. At this point, the upper and lower flasks were put together to complete compression molding, and then allowed to cool naturally.

After cooling, separate the upper and lower flasks and remove the denture base.

If you pull the artificial tooth strongly with your hands, it will come off the denture base. Apply methylene chloride 100 to the cavity of the artificial tooth.
A solution consisting of 15 parts by weight of polycarbonate resin and 15 parts by weight of polycarbonate resin was coated on the tooth, and after air-drying for a few seconds, a 7-piece acrylic resin artificial tooth was removed and placed under light pressure. After that, 80
The artificial teeth that were heat-treated for 60 minutes in a hot air drying oven at ℃ did not come off easily even when pressed hard, and a denture base in which the artificial teeth were firmly planted was obtained.

Next, methylene chloride tooff was applied to the mouth part of the denture base.
A solution consisting of 1 part by weight of IFIF, 1 part by weight of polycarbonate resin (Mitsubishi Gas Chemical's Kneepilon 520Qcz) was applied with a brush, and after air-drying for a few seconds, a solution consisting of 1 part by weight of methylene chloride, 2 parts by weight of polycarbonate resin, and polymethyl was applied. A solution consisting of 1 part by weight of methacrylate resin (SumiPex MEi manufactured by Sumitomo Chemical Industries) was applied to the scratches and air-dried for a few seconds.

A hard backing material (Cool Liner ■, manufactured by Koh Co., Ltd.) was used in a conventional manner on the coated surface coated with the solution.

That is, the paratha and the liquid are combined, pressed and stretched evenly on the denture base, and then hardened.

m Formulation 1; j It adhered firmly to the polyethersulfone denture base and was sufficiently durable for practical use.

Comparative Example 2 A solution consisting of methylene chloride, polycarbonate resin, and methylene chloride, polycarbonate resin, and polymethyl methacrylate resin was applied.

The lining material is easily removed from the denture base and cannot be used.

Effects of the Invention As described above, the present invention makes it possible to firmly bond dental polysulfone resin and dental acrylic resin by using a solution consisting of methylene chloride and polycarbonate resin as an adhesive. This has the effect of dramatically expanding the practical range of dental prostheses that combine polysulfone resin and acrylic resin.

[Brief explanation of the drawing]

The at figure is a side view showing a practical aspect of the artificial tooth fracture test. 1......Artificial tooth 1...Incisal end 1' of artificial tooth...Neck part 2 of artificial tooth...
...Resin floor part 8...Holder 4...Artificial tooth tension fitting Fig. 1

Claims (1)

[Claims] An adhesive used to bond dental polysulfone resin and dental acrylic resin, consisting of methylene chloride and polycarbonate resin.
0.3 to 0.00 parts by weight of polycarbonate resin
A dental adhesive characterized by containing 20 parts by weight.