JPH0454959A - Polysulfone-based denture base preform material - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a polysulfone preform material for denture base molding.

[Conventional technology] Conventional acrylic dentures are made by filling a plaster mold with a mixture of acrylic monomers and polymers and then heating and polymerizing them. It has the advantage of being adhered to.

However, denture bases obtained by heating polymerization of such acrylic resins not only have the disadvantage of being brittle and easily cracked, but also have the disadvantage that residual upper dentures may form if the heating polymerization reaction is insufficient.
It has a hygienic drawback in that it elutes and causes allergic symptoms.

In order to eliminate such drawbacks of acrylic denture bases, a denture base manufacturing method in which thermoplastic resin is compression molded has been proposed (for example, Japanese Patent Publication No. 60-58658).

Among these, denture bases made of polysulfone resin have high mechanical strength and excellent impact resistance, but because they do not bond with the commonly used acrylic artificial teeth, acrylic artificial teeth are not compatible with polysulfone resin denture bases. It has the disadvantage that it can easily fall off.

In order to improve the adhesion between acrylic artificial teeth and polysulfone resin denture bases, a method has been proposed in which a solution of polycarbonate dissolved in a chlorinated solvent is applied as an adhesive to the base of the acrylic artificial teeth (for example, Japanese Patent Publication No. 1-24
2059), but the adhesiveness is still not sufficient.
It is necessary to give the acrylic artificial tooth a special shape to keep it fixed, and depending on the shape, it has the disadvantage of reducing the strength of the acrylic artificial tooth itself.

C invention tries to solve! ! ! An object of the present invention is to provide a polysulfone resin denture base that has excellent adhesiveness to acrylic artificial teeth.

(Means for Solving the Problems) As a result of intensive studies in view of the above problems, the present inventors have found that in a denture base manufacturing method in which polysulfone resin is compression molded,
The present invention was completed based on the discovery that the adhesion to acrylic artificial teeth is significantly improved by using a polysulfone preform having a polycarbonate layer on the surface layer as a denture base material. That is, the present invention is a polysulfone denture base preform material for compression molding, which is characterized by having a polycarbonate layer with a thickness of 5 μm to 1 mm on the surface layer.

Polysulfone denture base preform material is a denture base preform made from polysulfone resin.
Although its shape is not particularly limited, a shape resembling a dental arch is generally used. Here, the polysulfone resin refers to a polyarylene polyether polysulfone in which arylene units are located randomly or orderly together with ether and sulfone bonds,
For example, a polymer having the structure or the structure can be exemplified.

The acrylic artificial tooth referred to in the present invention is a combination of MMA homopolymer, methacrylate such as butyl methacrylate, and MMA.
This is an artificial tooth made of acrylic resin such as a copolymer with.

The polycarbonate used as the surface layer of the polysulfone-based denture base preform material of the present invention is a 4,4-dioxydiallylalkane-based polycarbonate, such as bis(4-hydroxyphenyl)methane, bis(4-hydroxyphenyl)methane,
-hydroxyphenyl)ethane, 2,2-bis(4-
hydroxyphenyl)propane, bis(4-hydroxy-3゜5-dichlorophynyl)methane, 2,2-bis(4-hydroxy-3,5-dimethylphenyl)propane, bis(4-hydroxyphenyl)phenylmethane, etc. It is obtained from 4,4-dioxydiphenylalkane and phosgene or diphenyl carbonate.

Such polycarbonate can be produced by melt polymerization, which is already known.
It can be produced by various methods such as solution polymerization and interfacial polymerization.

The thickness of the polycarbonate layer is usually 5 μm to 1 mm, preferably 10 um to 700 ttm, more preferably 10 μm to 500 μm.

If the thickness of the polycarbonate layer is less than 5 μm, the adhesion strength will not be sufficient, and if it exceeds 1 mm, it may lead to a decrease in the strength of the denture, which is not preferable. It is also possible to appropriately mix and use compatible thermoplastic resins such as .

One method for applying a polycarbonate layer to the surface of a polysulfone preform material is to apply a solution of polycarbonate in an organic solvent to the surface of the cough preform material. The organic solvent is not particularly limited as long as it dissolves the polycarbonate, but chlorinated hydrocarbon solvents such as dichloromethane, chloroform, and carbon tetrachloride are preferred from the viewpoint of ease of handling. It is preferable to use it at a concentration of ~20 wt% from the viewpoint of operability.

Another preferred method is to provide a polycarbonate layer on the surface layer of the polysulfone preform material by placing a polycarbonate film or sheet with a thickness of 5 μm to 1 mm on the surface of the preform material and heat-sealing it. be.

[Examples] Examples are shown below to specifically explain the present invention, but the present invention is not necessarily limited to these examples.

(Example 1) According to the artificial tooth fracture test method described in the Japanese Industrial Standard JIS T-6511, acrylic resin artificial teeth (manufactured by Menshi Dental Industry ■, GC acrylic resin front teeth, 1 set of 6 teeth) were tested. It was planted in a paraffin wax model so that the line connecting the incisal end and the neck of the tooth was at a 45° angle with the paraffin wax model, and after being embedded in plaster in a flask, cast wax was used to form a plaster mold. Divide this flask and heat the upper and lower flasks to 130°C and 220°C, respectively.
Preheating was performed at.

In addition, a 15-1% chloroform solution of polycarbonate (Niepilon 520000, manufactured by Mitsubishi Gas Chemical Corporation) was applied and dried on the surface of a 3 mm thick U-shaped polysulfone (manufactured by Union Carbide Corporation, Lldel@) based preform material. A polycarbonate layer with a thickness of 30 μm is provided,
This preform material was preheated at 130 to 180°C.

Place the preheated preform material on top of the plaster mold in the lower flask, heat it with a far infrared heater until the surface of the preform reaches about 350°C, and then soften it.
The upper flask containing the acrylic artificial tooth was compression molded together.

After cooling, the upper and lower flasks were separated, and the molded product taken out was pulled at 12 kgf/sin to determine its breaking strength. The results are shown in Table 1.

The breaking strength was good at 20 kgf, and as is clear from the standard deviation value obtained by conducting the test under the same conditions 10 times, there was little variation and no problem in practical use.

Examples 2 to 3 Tests were conducted in the same manner as in Example 1, except that the thickness of the polycarbonate layer on the surface of the preform material was as shown in Table 1. The results are summarized in Table 1.

Comparative Example 1 A test was conducted in the same manner as in Example 1 except that the polycarbonate layer was not provided on the surface of the preform material. The fracture strength was 2 kgf, which was insufficient for practical use due to large variations.

Comparative Example 2 A test was conducted in the same manner as in Example 1, except that the thickness of the polycarbonate layer on the surface of the preform material was as shown in Table 1. The results are summarized in Table 1,
This was insufficient for practical use.

Examples 4 to 5 A film of polycarbonate (manufactured by Mitsubishi Gas Chemical Co., Ltd., Kneepilon 52000@) was placed on the surface of the preform material, and the film was preheated at 120°C. A molded article was obtained in the same manner as in Example 1. The test results are shown in Table 1.

Comparative Example 3 Polycarbonate (manufactured by Mitsubishi Gas Chemical Co., Ltd., Kneepilon 520000) 15 was applied to the base of an acrylic resin artificial tooth.
Except that @t% chloroform solution was applied and dried, and no polycarbonate layer was provided on the surface of the preform material.
The test was conducted in the same manner as in Example 1. Fracture strength is 8
kgf, and the variation was large, which was insufficient for practical use.

[Effects of the Invention] By using the polysulfone preform material for denture base molding of the present invention, it is possible to reliably and firmly bond acrylic artificial teeth and polysulfone denture bases, which do not inherently have adhesive properties. can. As a result, it is possible to obtain a denture that has both the excellent aesthetics of an acrylic artificial tooth and the excellent mechanical strength and impact resistance of a polysulfone denture base.

[Brief explanation of the drawing]

FIG. 1 is a side view showing an embodiment of an artificial tooth fracture test. 1. Artificial tooth 1°0 Incisal end of artificial tooth 1"6 Neck part of artificial tooth 2. Resin base part 3. Holder 4. Artificial tooth tensioning fitting

Claims (1)

[Claims] A polysulfone denture base preform material for compression molding, characterized by having a polycarbonate layer with a thickness of 5 μm to 1 mm on the surface layer.