JPH074395B2 - Method for manufacturing denture base - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a denture base made of resin, and more particularly to a new method for producing a denture base that can be implemented with good workability and can obtain a molded product with high dimensional accuracy. Is.

[0002]

2. Description of the Related Art A conventional denture base manufacturing method includes a model burying process, a dewaxing process, a drying / release agent applying process, a resin injection process, a polymerization process, and a denture base removal process. The waxing process was performed in the first pot, the subsequent drying / releasing agent coating process was performed in a vacuum pot different from the first pot, and in the polymerization process, heating was again performed with steam in the first pot.

[0003]

However, in the above-mentioned method, the pot to be used is different depending on the process, so that the operation becomes very complicated, and a polymerization product with steam cannot obtain a molded product with high dimensional accuracy.

In view of the above situation, an object of the present invention is to perform a dewaxing process and a drying / releasing agent applying process with a single pot with good workability to obtain a denture having a high dimensional accuracy. It is to provide a method for producing a floor with high efficiency.

[0005]

The present invention has been completed based on the finding that the above object can be achieved by using a specific heat source for dewaxing and polymerization.

[0006] That is, the method for producing a denture base according to the present invention is as follows: A model burying step in which a brazing wire for venting is provided and a brazing wire for brazing sprue is provided on the top of the denture base model in a standing manner, and plaster for burying is flowed into the flask to bury the denture base model in the plaster, b ) Placing the flask in the pot, connecting a conduit to the sprue port of the flask lid, melting the wax of the denture base model with hot water from the conduit and discharging the melt from the vent port, c) above in the pot, after vacuum drying the plaster mold formed by dewaxing, and set and release agent application step of applying a release agent to the mold inner surface, a resin injection machine d) flask bonnet gypsum A resin injection step of press-fitting the resin into the inside, e) a polymerization step in which the lower part of the flask is immersed in hot water to heat the lower part of the resin, and the resin is heated and polymerized in a microwave; , A denture base removing step of crushing a gypsum lump and taking out a denture base formed by polymerization of a resin.

[0007]

According to the method for manufacturing a denture base of the present invention, the dewaxing step and the drying / releasing agent application step are carried out in one pot, so the workability of the operation is very good.

In the polymerization step, the lower part of the flask is first immersed in hot water. By this immersion, the lower part of the resin is slightly polymerized and water penetrates into the flask. As a result, a water-containing part is formed in the lower part of the resin and a non-water-containing part is formed in the upper part.

Next, the resin is heated with a microwave. As a result, the water-containing part of the resin is preferentially polymerized and cured, and then the non-water-containing part of the resin is polymerized and cured. In this way, since there is a time lag in curing, a denture base molded article with high dimensional accuracy can be obtained.

[0010]

EXAMPLES Next, in order to specifically explain the present invention, each step of the denture base manufacturing method according to the present invention will be described.
A more detailed description will be given with reference to the drawings.

A) In the model burying step, first, vaseline is applied as a release agent to the inner surface of the flask (1) and the inner surface of the plastic bottom plate (2) such as FRP shown in FIG. Then, a denture made of ceramic or plastic
Place the brazing denture base model (3) on which the (33) is placed in the flask (1) and fix it to the plastic bottom plate (2) with the fixing plaster (4). The fixing position is the top of the denture base model (3) and the flask.
Set so that the height of the vent port (5) of (1) is almost the same.

Next, a flask is placed on the side of the denture base model (3).
A vent brazing wire (6) reaching the vent port (5) of (1) is provided, and a brazing wire for brazing sprue (7) is provided in a rising shape on the top of the denture base model.

Then, as shown in FIG. 2, the flask (1)
The plaster for embedding (8) is flown into the denture base model (3) to be embedded in the plaster. The burial plaster (8) is preferably mixed with glass chips (10). By mixing the glass chip (10), it is possible to cause a time difference in the polymerization of the resin in the heating and polymerization process of the resin by the microwave.
Then cap the flask (1) with the lid (9) and cover the sprue mouth (1
Pass the sprue brazing wire (7) through the (1) and attach the lid (9) to the bolt (12).
Secure to the top of the flask (1) with.

B) In the dewaxing step, as shown in FIGS. 3 and 4, two flasks (1) are placed in a pot (13), and a branch pipe is connected to a sprue port (11) of a flask lid (9). Each injection nozzle (15) of (14) is inserted, and the base end of the branch pipe (14) is connected to the conduit (16) by a connector (19).

Then, hot water having a temperature of about 95 to 100 ° C. coming from the instantaneous water heater through the conduit (16) is injected by the injection nozzle (15) for about 15 minutes to melt the wax of the denture base model (3). Allow the melt to drain through the vent (5). Since the drain valve (17) of the pot (13) is closed, hot water collects in the pot (13) and overflows from the drain port (18). The molten wax is discharged from the pot (13) together with the hot water.

Then, the drain valve (17) of the pot (13) is opened to drain hot water. After the water level has dropped, it is confirmed that no wax has been discharged from the vent port (5), and hot water injection is continued for another 25 minutes to complete the dewaxing. Thus, the plaster mold (22) is formed by dewaxing.

C) In the mold release agent applying step, as shown in FIG. 5, the flask (1) is kept in the pot (13).
Vacuum pump (21) with drain valve (17) and drain (18) closed and connector (19) closed with rubber stopper (20) and connected to pot (13)
For 2 minutes to reduce the pressure in the pot (13). As a result, moisture inside the gypsum mold (22) evaporates, and the gypsum mold (22) is cooled by removing the heat of evaporation.

Then, the sprue mouth (1
Inject mold release agent from 1) and discharge from vent port (5).
Thereafter, the pot (13) is evacuated to remove excess release agent. In this way, the release agent is applied to the inner surface of the mold. Then, this is left until the temperature of the plaster mold (22) becomes almost room temperature.

D) In the resin injection step, as shown in FIG. 6, the resin injection cylinder (23) is set on the flask lid (9) so as to communicate with the sprue port (11). The dough-shaped resin (24) obtained by mixing the resin liquid and the resin powder in a plastic bag is placed in the cylinder (23) together with the bag. Then,
The resin (24) is pressed through the pressure plate (27) to the hydraulic press (2
Pressurize with 5) and press into the plaster mold (22) through the sprue port (11).

If the excess resin is extruded from the vent port (5) of the flask (1), as shown in FIG.
Install the vent stopper (26) on the side of (1) and
Close (5). In this state, place the resin (24) on the hydraulic press machine.
Further pressurize at (25). The pressure is about 100 kg / cm ² .

Next, the resin pressure is about 100 kg.
Once stabilized at / cm ² , remove the hydraulic press (25) from the cylinder (23) and replace it with the spring pressure device (32) shown in FIG. This device (32) has a cylinder (2
3) The spring (28) to be housed inside, the spring pressure plate (29) placed on the upper end of the spring (28), and the plate (2
It consists of a cap nut (30) that holds the cylinder (9) at the top of the cylinder (23).

E) In the polymerization step, first, hot water of about 80 ° C. is stored in the pot (13), and the lower half of the flask (1) is immersed in this for 2 to 3 minutes to make a plaster mold (22). Heat the bottom of the resin (24) inside. By this immersion, the lower part of the resin (24) was slightly heated and polymerized, and the bottom plate (2) was placed in the flask (1).
Water enters from the fitting portion, and as a result, the water-containing portion (24a) is formed in the lower portion of the resin (24) and the non-water-containing portion (24a) is formed in the upper portion.

Then, as shown in FIG. 8, the flask (1) still equipped with the spring pressurizing device (32) was placed in a microwave oven (3).
It is placed inside 1) upside down and the resin (24) is irradiated with the microwave through the plastic bottom plate (2) for about 8 minutes. As a result, the water-containing part (24a) of the resin (24) is preferentially polymerized and cured, and then the non-water-containing part (24b) of the resin (24) is polymerized and cured. The resin (24) shrinks as it hardens, but the resin (24)
Since the spring is pressurized by the spring pressure device (32) during curing, the contraction amount of the resin (24) accompanying the curing is replenished from the sprue port (11). In this way, a molded product with high dimensional accuracy can be obtained.

After the polymerization, the mixture is allowed to cool for about 30 minutes and then cooled for about 30 minutes with water.

F) In the denture base removing step, a flask is used.
Remove the lid (9) from (1), turn the flask (1) upside down, press the bottom plate (2) at about 20 kg / cm ² with a hydraulic press (25), and take out the gypsum lump from the flask (1). Then, the gypsum mass is crushed and the molded product inside is taken out. Thus
Obtain a denture base made of resin.

[0026]

According to the denture base manufacturing method of the present invention, the dewaxing step and the drying / releasing agent application step can be carried out in one pot, so that the workability of the operation can be greatly improved.

In the polymerization step, since the lower part of the flask is first immersed in hot water, this immersion allows the lower part of the resin to be slightly polymerized by heating, and water can be introduced into the flask. As a result, the water-containing part can be formed in the lower part of the resin and the non-water-containing part can be formed in the upper part.

Next, since the resin is heated in a microwave, the water-containing part of the resin can be preferentially polymerized and cured, and then the non-water-containing part of the resin can be polymerized and cured.
In this way, by providing a time difference for curing, it is possible to obtain a denture base molded article with high dimensional accuracy.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing a pre-process in a model burying process of the present invention.

FIG. 2 is a vertical sectional view showing a post-process in the model burying process of the present invention.

FIG. 3 is a partially cutaway vertical sectional view showing a dewaxing process of the present invention.

FIG. 4 is a horizontal sectional view showing a dewaxing process of the present invention.

FIG. 5 is a horizontal cross-sectional view showing a release agent applying step of the present invention.

FIG. 6 is a vertical sectional view showing a previous step in the resin injection step of the present invention.

FIG. 7 is a vertical cross-sectional view showing a post-step in the resin injection step of the present invention.

FIG. 8 is a vertical sectional view showing a polymerization step of the present invention.

[Explanation of symbols]

1 ... Flask 2 ... Plastic bottom plate 3 ... Denture base model 4 ... Fixing plaster 5 ... Vent port 6 ... Vent brazing wire 7 ... Wax sprue brazing wire 8 ... Buried plaster 9 ... ... Flask lid 11 ... Sprue port 13 ... Pot 16 ... Conduit 24 ... Resin

Claims (1)

[Claims] 1. A) A brazing denture base model is fixed to a plastic bottom part in a flask with a plaster for fixing, and a brazing wire for venting to a vent port of the flask is provided on a side part of the denture base model. A brazing wire for wax sprue is provided on the top of the model in a standing shape, and a model burying process for burying the denture base model in the plaster by injecting the burying plaster into the flask; A dewaxing process in which a conduit is connected to the sprue opening of the lid, and the hot water from the conduit melts the wax of the denture base model to discharge the melt from the vent opening; and c) formed by dewaxing in the pot A step of applying a release agent on the inner surface of the mold after drying the gypsum mold under reduced pressure; and d) a resin injection process of setting a resin injection machine on the flask lid and press-fitting the resin into the gypsum mold. Polymerization process in which the lower part of the flask is immersed in hot water to heat the lower part of the resin, and the resin is heated and polymerized in a microwave; A method for producing a denture base, which comprises a denture base take-out step of taking out a denture base.