JPH0448459B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of suspending an upper flask from the upper plate of a compressor in the process of manufacturing a thermoplastic resin denture base by compression molding.

The present inventor has recently developed a method for manufacturing a denture base by compression molding a thermoplastic resin, and has filed a patent application (Japanese Patent Application No. 56-99892).

The invention is directed to practice in this manner. In the process of manufacturing denture bases using the conventional polymerization method, a rice cake-like mixture of polymer and monomer is placed at room temperature into a plaster-shaped flask by hand, test pressure is applied, and the upper and lower flasks are opened to remove excess resin burrs. After applying pressure again, it was clamped and heated for polymerization. However, in the compression molding method using thermoplastic resin as denture base material, the resin is heated and softened and pressure molded in a plaster mold, so both the flask and the resin are heated, making it difficult to handle with fingers and hands. Molding must be completed by applying pressure. At this time, since the flask contains artificial teeth, there is a contradictory restriction that it must not be heated too much.

Therefore, in the compression molding method, the upper flask is suspended from a compressor, the thermoplastic resin material for the denture base is placed on the plaster surface of the lower flask, the denture base material is heated and softened in a heating chamber, and then the lower flask is It is moved to the position where it will be combined with the upper flask and is molded by compression pressing.

As a result of study, the present inventor found the following requirements to enable this compression molding.

(1) Attach the upper flask to the upper plate of the compressor.

(2) Promptly move the lower flask from the heating chamber to a position where it can be accurately combined with the upper flask.

(3) Since several to dozens of flasks are molded, they must be easily and accurately attached to and removed from the compressor.

An object of the present invention is to provide a method for suspending an upper flask on the upper plate of a compressor so as to satisfy requirements (1) and (3) above.

The present invention provides a convex line or a concave line on the upper plate of the compressor,
The shape of the cross section of the convex strip is such that the width at a certain position is larger than the width of at least a part of the upper layer, and the shape of the cross section of the grooved strip is such that the width at a certain position is larger than the width of at least a portion of the lower layer. A concave strip that is larger than at least a part of the width, and has a space on the upper part of the upper flask that is approximately the same shape as the convex strip on the upper plate, or a convex portion that is approximately the same shape as the space on the concave strip on the upper plate. Providing a convex strip having
This is a method of suspending an upper flask for denture base molding from an upper plate of a compressor, which is characterized by inserting a groove or groove on the upper flask from one end of a convex or grooved line on the upper plate of the compressor. FIG. 1 is an example of a sectional view of a compressor and a flask used in the present invention.

In the figure, 1 is a compressor, 2 is an upper plate thereof, 3 is a member having grooves with a wedge-shaped cross section provided on the lower surface of the upper plate, and 4 is a member having a space on the upper surface that is approximately the same shape as the grooves. An upper flask having a convex portion, 5 a lower flask, 6 and 6' plaster molds, 7 a thermoplastic resin denture base material, and 8 an artificial tooth. Reference numeral 9 denotes a protruding strip with a wedge-shaped cross section provided on the back surface of the lid of the upper flask, and serves to fix the lid to the upper flask body by hardening of the plaster.

FIG. 2 is a partial side view of FIG. 1.

In the figure, 10 is a stopper for stopping the convex strip of the upper flask at a predetermined position when inserting the convex strip of the member 3 into the groove strip, and 11 is a position adjustment screw.

FIGS. 3 to 5 are examples of cross sections of protrusions provided on the upper plate of the compressor of the present invention.

In all of these, the shape of the cross section of the protrusion is such that the width a at a certain position is larger than the width b at at least a part of the upper position.

6 to 8 are examples of cross sections of grooves.

In all of these, the shape of the cross section of the groove is such that the width a at a certain position is larger than the width b at at least a part of the lower position.

In the examples shown in FIGS. 1 to 8, the upper plate 2 and another member 3 of the compressor are provided with protrusions or grooves, and these are attached downward to the lower surface of the upper plate 2. You may provide a convex line or a concave line directly on the lower surface of 2. On the upper part of the upper flask, there is a concave strip having a space approximately the same shape as the convex strip provided on the top plate of the compressor, or a convex portion having a convex portion approximately the same shape as the space of the concave strip provided on the top plate. Establish an article.

By sliding and inserting the grooves or grooves on the top of the upper flask from one end of the grooves or grooves on the upper plate of the compressor configured as above, the upper flask can be placed in a predetermined position on the top plate of the compressor. It can be easily and accurately attached to the mold, and it can also be easily removed after molding.

[Brief explanation of drawings]

FIG. 1 is an example of a sectional view of a compressor and a flask used in the present invention. FIG. 2 is a partial side view of FIG. 1. FIGS. 3 to 5 are examples of cross sections of protrusions provided on the upper plate of the compressor of the present invention. FIGS. 6 to 8 are examples of cross sections of grooves provided on the upper plate of the compressor of the present invention. In the figure, 1 is a compressor, 2 is an upper plate thereof, 3 is a member having grooves, 4 is an upper flask having a protrusion on its upper part, and 5 is a lower flask.

Claims (1)

[Claims] 1 Protrusions or grooves are provided on the upper plate of the compressor, and the cross-sectional shape of the grooves is such that the width at a certain position is larger than the width of at least a part of the upper part, and the width of the grooves is a recessed strip having a cross-sectional shape in which the width at a certain position is larger than the width at at least a part of the lower part thereof, and on the other hand, the upper flask has a space in the upper part of the upper flask that has a substantially same shape as the protruding strip on the upper plate; Alternatively, a convex strip having a convex portion having approximately the same shape as the space of the concave strip on the upper plate is provided, and the concave strip or convex strip on the upper flask is inserted from one end of the convex strip or concave strip on the upper plate of the compressor. A method of suspending an upper flask for denture base molding from an upper plate of a compressor, characterized by: