JPS6232017Y2 - - Google Patents

Description

[Detailed explanation of the invention] This invention was filed under patent application No. 56-99892 dated June 26, 1982.
Regarding a denture base manufacturing device that enables the denture base manufacturing method, which was filed by the same applicant in Japanese Patent Publication No. 60-58658, the purpose is to efficiently manufacture high-precision denture bases using an inexpensive device. To provide a denture base manufacturing device which can be obtained and which does not cause damage to artificial teeth.

A thermostatic chamber that houses the lower flask containing the thermoplastic synthetic resin, heats the lower flask, and heats and softens the thermoplastic synthetic resin, and a suspension system that suspends the upper flask containing the artificial tooth from the compression molding machine. and a guide for guiding the lower flask from the thermostatic chamber to below the upper flask, and when the synthetic resin is heated and softened, the lower flask is taken out of the thermostatic chamber and moved along the guide to below the upper flask. At the same time, the upper and lower flasks are put together and compression molded.

Furthermore, embodiments based on the above features will be described with reference to the accompanying drawings.

1 is heated to 100℃ to 400℃ using an appropriate heater such as hot air 2.
It is a thermostatic chamber that can freely set the temperature around ℃ according to the temperature conditions of the resin, and houses a lower flask 4 on which a thermoplastic synthetic resin board 3 is placed. 3 is heated and softened. The thermostatic chamber 1 is provided with a transparent section 1a.

Reference numeral 5 denotes a thermostatic chamber whose temperature can be freely set from normal temperature to around 100 DEG C. according to the temperature conditions of the resin using an appropriate heater, and houses the thermostatic chamber 1 and the compression molding machine 6. Furthermore, the greenhouse 5 is provided with a transparent portion 5a.

The compression molding machine 6 consists of a cylinder 8 vertically disposed on the floor 7 of the constant temperature room 5, and a sliding frame 9 provided on the piston 8a of the cylinder 8.
Compression molding is performed by moving the sliding frame 9 up and down inside.

10 is an engaging part 10 provided on the upper part of the sliding frame 9
a, and an engaging part 10b provided on the upper flask 4a containing the resin artificial tooth 11, and the engaging part 10b of the upper flask 4a is connected to the sliding frame 9 The figure shows the case of entering the portion 10a.

A pair of left and right guides 12 are provided on the floor 7 of the thermostatic chamber 5, and connect the inlet 1b of the thermostatic chamber 1 with the lower part of the upper flask 4a of the compression molding machine 6.

13 is a stopper for stopping the lower flask 4 in a fixed position.

Reference numeral 14 designates a pressure holder that continues to pressurize the upper and lower flasks 4a and 4 after compression molding, and 15 represents an engaging portion between the upper and lower flasks 4a and 4.

The synthetic resin plate, the upper flask, and the lower flask are preheated in preheating chambers (not shown) each having a desired temperature.

For example, Jitsugan No. 98178 (1983)
As proposed by the applicant in No. 33941), a heat-resistant mantle installed in the thermostatic chamber 5 so that hands can be inserted and removed, or a belt conveyor or cylinder installed in a box under the floor 7 (not shown) An automatic control machine or the like takes out the lower flask 4 on which the thermoplastic synthetic resin plate 3 is placed, with the synthetic resin heated and softened, from the thermostatic chamber 1, moves it along the guide 12, and places it in the compression molding machine 6. It is brought under the upper flask 4a and fixed by the stopper 13. Note that even if the temperature inside the thermostatic chamber 5 temporarily decreases when moving the lower flask 4,
Since the synthetic resin once softened in the constant temperature room 1 maintains its softened state, no problems occur during compression molding.

Thereafter, when the compression molding machine 6 is operated, the piston 8a extends and the sliding frame 9 descends, so that the upper flask 4a suspended from the sliding frame 9 is combined with the lower flask 4 and compression molded.

Thereafter, the hanging means 10 is disengaged, and the upper and lower flasks 4a, 4 are transferred to the pressure holder 14 and taken out to cool naturally.

Since the present proposal is as described above, it exhibits the following effects.

Firstly, since the thermoplastic synthetic resin 3 that has already been softened by heating in the thermostatic chamber 1 is compression molded in the thermostatic chamber 5, a high-precision denture base without polymerization shrinkage can be easily produced using inexpensive equipment. Become.

In other words, compared to the conventional method of mixing acrylic resin polymer powder and monomer liquid to form a rice cake, placing it in a plaster mold using the Lost Wax method at room temperature, and polymerizing it in hot water by applying pressure with a press, 7% Because of polymerization shrinkage, the accuracy was poor, and polymerization took several hours, making it inefficient.Also, polymer pellets were heated and pressed as a fluid into plaster molds. However, as mentioned above, this invention eliminates these drawbacks and creates a high-precision denture base. This can be done efficiently with inexpensive equipment and has the advantage of being effective.

Second, the lower flask 4 is taken out from the thermostatic chamber 1 while the synthetic resin 3 is heated and softened in the thermostatic chamber 1, and moved along the guide 12 to below the upper flask 4a containing the artificial tooth 11; Upper and lower flasks 4 outside the thermostatic chamber 1
A and 4 are combined and compression molded, so synthetic resin 3
At the same time, there is no risk that the artificial tooth 11 will be heated and softened.
A high quality denture base can be obtained.

Third, since compression molding can be performed under constant temperature conditions, the molding is good, and the extent to which the resin protrudes from the flask can be visually confirmed, making it possible to mold the resin in every corner. Particularly in the case of dental denture bases, there is only one mold that fits the order, so there is no room for failure, so being able to visually check it like this is very effective. In extrusion molding and injection molding, since the resin does not protrude, there is a risk that it will not reach every corner, but the present invention can eliminate this drawback.

Fourthly, not only acrylic resin but also various types of thermoplastic resins can be used, which provides excellent effects.

Fifth, by preparing a plaster mold that is set in advance to thermally expand according to the shrinkage size of the resin upon cooling, and using this plaster mold, the plaster mold expands by the shrinkage size of the resin when heated. As a result, it looks like a mold made larger by the amount of resin shrinkage, and the expanded plaster mold is used to mold the resin. During cooling, the plaster mold contracts by the amount of resin contraction, so that a desired resin molded product can be obtained.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention; Fig. 1 is an overall perspective view, Fig. 2 is a perspective view of the main parts of the above, Fig. 3 is a longitudinal sectional front view of the same, and Fig. 4 is a sectional view showing the operating state. . 1... Constant temperature room, 3... Thermoplastic synthetic resin, 4...
...Lower flask, 4a...Upper flask, 6...
Compression molding machine, 10... Hanging means, 11... Artificial tooth.

Claims (1)

[Scope of utility model registration request] A thermostatic chamber that houses the lower flask containing the thermoplastic synthetic resin, heats the lower flask, and heats and softens the thermoplastic synthetic resin, and a suspension system that suspends the upper flask containing the artificial tooth from the compression molding machine. and a guide for guiding the lower flask from the thermostatic chamber to below the upper flask, and when the synthetic resin is heated and softened, the lower flask is taken out of the thermostatic chamber and moved along the guide to below the upper flask. A denture base manufacturing device characterized by compressing and molding upper and lower flasks together.