JPH06136B2 - Denture base molding method - Google Patents

Description

TECHNICAL FIELD The present invention relates to a method for molding a polysulfone denture base having a smooth surface with high production efficiency.

[Prior Art and Problems Thereof] When molding a polysulfone denture base, it is necessary to raise the temperature of the gypsum mold in order to suppress molding defects in either injection molding method or compression molding method. Since plaster causes remarkable surface roughening at high temperatures, it was necessary to polish the surface of the denture base after molding in order to obtain a denture base with a smooth surface. Alternatively, a method has also been proposed in which a gypsum mold is treated before molding to facilitate the separation of the gypsum mold and the polysulfone denture base molded product to obtain a denture base having a smooth surface. For example, in JP-A-59-189838, a gypsum mold is coated with a fluororesin and dried at 80 to 90 ° C. for 10 minutes,
It is described that the temperature is raised at a rate of 10 ° C./min, and baking is performed at 380 to 390 ° C. for 10 minutes to form a fluororesin film on the surface of the gypsum mold to obtain a good denture base without scratches. However, this method requires a temperature raising operation, which makes the equipment expensive. Further, there is a problem of low productivity, such as waste of time associated with temperature rise and cooling, and a limited number of gypsum molds that can be processed in one operation.

[Means for Solving Problems] The present invention provides a polysulfone denture base having a smooth surface,
The present invention relates to a method for molding with high production efficiency.

That is, the present invention is to obtain a denture base having a smooth surface and good reproduction of a predetermined shape by treating a polysulfone denture base molded with a gypsum mold and having surface roughness with chlorinated hydrocarbon.

The present invention will be described below according to the steps.

Using a heated gypsum mold, a polysulfone denture base is molded by an injection molding method or a compression molding method. At this time, the heating temperature of the gypsum mold may be about 80 to 250 ° C. In particular,
Heating to about 150 to 250 ° C. is preferable because the strength of the gypsum mold is reduced, and the molded denture base is easily indexed. After removing the gypsum adhering to the indexed denture base with forceps, it is immersed in a gypsum solution and ultrasonically cleaned. Next, the gypsum can be almost completely removed by washing with water and drying, but the resulting denture base is whitened due to the rough surface. When this denture base surface is subjected to contact treatment with chlorinated hydrocarbon, the rough surface layer is rapidly dissolved, and a polysulfone denture base in which a predetermined shape is reproduced by lubrication can be obtained. Here, the polysulfone denture base is a denture base formed using a sulfone resin such as Udel Polysulfone manufactured by Union Carbide or polyether sulfone manufactured by Imperial Chemical Industries.

Examples of the chlorinated hydrocarbon include aliphatic and aromatic chloro derivatives such as dichloromethane, chloroform, trichloroethylene, monochlorobenzene, and dichlorobenzene. You can use these as they are,
It may be diluted with a solvent such as ethanol that does not adversely affect the polysulfone denture base. The simplest method of contact treatment is to apply a chlorinated hydrocarbon with a brush or brush. The denture base may be immersed in the chlorinated hydrocarbon for a short time.

The heating temperature of the gypsum mold is preferably 80 to 180 ° C for injection molding and 150 to 250 ° C for compression molding. According to the method of the present invention, since heat molding can be performed at a constant temperature in this temperature range, a large number of gypsum molds can be heat-treated at the same time, and productivity is greatly improved.

The present invention will be described below with reference to examples.

Example 1 A plaster mold having a mucosal impression on the lower mold and artificial teeth on the upper mold was prepared according to a conventional method. After heating the lower gypsum mold at 200 ° C. for 1 hour, place a dry polysulfone board on the surface and place it at 380
Softened at 0 ° C for 5 minutes. The upper molds dried at 150 ° C. were stacked and compression molded. After indexing, the gypsum was removed by dissolution, washed with water, dried and then coated with dichloromethane. As a result, a polysulfone denture base with a smooth surface and gloss was obtained.

Example 2 A solvent mixed with chloroform: ethanol = 1: 1 was applied with a brush to a polysulfone denture base which was molded, washed with water and dried in the same manner as in Example 1. As a result, a polysulfone denture base with a smooth surface and gloss was obtained.

[Comparative Example] A polysulfone denture base was prepared in the same manner as in Example 1.
The gypsum was removed by dissolution, washed with water and dried. The obtained denture base was whitened over the entire mucosal surface, and no gloss was observed.

[Effects of the Invention] According to the method of the present invention, a beautiful denture base with a smooth surface and gloss can be obtained. Moreover, since a large number of gypsum molds can be processed at the same time, the productivity is high.

Claims (1)

[Claims] 1. A method for molding a denture base, which comprises subjecting the surface of a denture base made of polysulfone, which exhibits plasticity at high temperatures, to a contact treatment with a chlorinated hydrocarbon.