JPH0335941B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to a method for manufacturing a denture.

(Prior Art) Conventional dentures are manufactured by embedding a prototype in a flask to form a plaster mold, then filling the plaster mold with resin and hardening it by polymerization. As the resin, a room temperature polymerization resin or a heat polymerization resin is used. Compared to heat-polymerized resin, which polymerizes at about 100°C, room-temperature polymerized resin polymerizes at room temperature and has less temperature difference with the surroundings, so cold-polymerized resin has less thermal deformation and higher molding precision. It is known that a fixed denture can be obtained.

(Problem to be solved by the invention) However, when room-temperature polymerization resin is used in the above-mentioned conventional denture manufacturing method, post-curing after polymerization and hardening is performed by natural cooling, so this post-curing takes a long time. There is a problem in that it takes one night or one day and night. In order to perform post-curing in a short time, there have been attempts to accelerate post-curing by heating room temperature polymerized resin (about 70 to 80°C) using moist heat. However, according to the moist heat method, the room-temperature polymerized resin is gradually heated from the outside, so the temperature rise rate of the room-temperature polymerized resin itself is slow, and it is not possible to significantly shorten the post-curing time by heating it rapidly. , remains difficult.

In order to solve these problems, the present inventor has made extensive efforts in research and development, and has come up with the method for manufacturing dentures described below.

(Means for Solving the Problems) In order to solve the above problems, the present invention forms a plaster mold by embedding a master model in a metal flask equipped with a pair of openings, and then After injecting room-temperature polymerization resin into the resin and curing it through polymerization,
The present invention provides a method for manufacturing a denture with a denture, which comprises post-curing the room-temperature polymerized resin by irradiating the flask with microwaves.

(Function) Since the method for manufacturing a denture of the present invention has the above-mentioned configuration, by directly heating the polymerized and hardened room temperature polymerized resin from the inside using microwaves, the temperature rise rate of the room temperature polymerized resin itself is accelerated, and the post It is possible to accelerate curing and reduce the time required for post-curing.

(Example) The present invention will be described with reference to an example in which the present invention is applied to a room-temperature polymerization resin in-press system (developed by Kultur GmbH, West Germany).

What is shown in FIGS. 1 and 2 is a flask 1 used in this example. The main body of the flask 1 is made of metal and consists of an upper case 1a and a lower case 1b. The top plate of the upper case 1a is provided with a large diameter water vapor passage part 2, while the bottom plate of the lower case 1b is provided with a large diameter microwave passage part 3.
It is equipped with The water vapor passage section 2 is covered with an upper lid 4 to prevent passage of microwaves during curing by microwaves. This top lid 4
The opening is covered with upper and lower two layers of wire mesh 4a, 4a. The wire mesh 4a has a fine mesh diameter and can prevent microwaves from passing through. This wire mesh 4
By providing the upper and lower layers a, the effect of blocking passage of microwaves is enhanced, and the wire meshes 4a, 4a are strongly protected from each other. When buried, the microwave passage section 3 is covered with a bottom plate 5 to prevent gypsum mud from flowing out.
The upper case 1a and the lower case 1b are provided with half-cylindrical parts 6a and 6b protruding in the radial direction at corresponding positions,
When the upper case 1a and the lower case 1b are stacked, three cylindrical parts 6 are formed on the outer periphery of the flask 1 where the upper and lower pair of half-cylindrical parts 6a and 6b are combined. When the flask ring 7 is fitted into each cylindrical portion 6, the upper case 1a and the lower case 1b are fixed so as not to be separated. Furthermore, a sprue 8 for resin injection is formed in one of these three cylindrical portions 6. Note that 9 shown in the figure is a vent for resin outflow. Reference numeral 10 denotes a stopper for the sprue 8, which includes a stopper bolt 10a, a stopper nut 10b, and a spring 10c.

A method for manufacturing a denture using the flask 1 configured as described above will be described.

The bottom plate 5 is fitted into the lower case 1b of the flask 1, and a prototype model (not shown) is buried in plaster. This prototype model is made by mixing several types of anhydrite to match the shrinkage rate of room-temperature polymerization resin a upon heating. After the upper case 1a of the flask 1 is buried, the water vapor passage section 2 is covered with a metal top plate and compressed from above and below using a flask press. The flask 1 in which the plaster mold 11 has been formed in this manner is placed in an injector 12 as shown in FIG. Since the flask 1 is compressed by the side walls 13, 13 of the injector 12, the water vapor passage section 2 of the upper case 1a and the microwave passage section 3 of the lower case 1b are sealed by the side walls 13. In this state, room-temperature polymerization resin a is charged.

The room-temperature polymerized resin a to be filled is a mixture of 13 c.c. of Intopress liquid (monomer) and 30 g of Intopress powder (polymer), and is slightly harder than usual. The room-temperature polymerized resin a pressurized to about 40 to 60 atmospheres by the piston 14 is charged into the plaster mold 11 through the sprue 8, and flows out from the vent 9, thereby completing the filling. Leave it in this state for about 10 minutes. Remove flask 1 from injector 12 and leave it for about 10 minutes. In this total period of about 20 minutes, the room temperature polymerization resin a is cured by polymerization.

Next, in order to post-cure the room-temperature polymerized resin a, as shown in FIG. 4, the upper lid 4 is placed over the steam passage part 2 of the upper lid 1a, and the flask 1 is placed in a microwave oven with the lower lid 1b facing down. do. Lower case 1b
The microwave passage section 3 of is left open. Turn on the microwave. The microwave b enters the flask 1 through the microwave passage section 3 and directly heats the room-temperature polymerized resin a, thereby significantly shortening the time required for post-curing. Further, an excessive amount of the microwave b is blocked from one direction of the microwave passage section 3 and enters the flask 1, and is diffusely reflected by the inner circumferential surface of the flask 1 and the wire mesh 4a of the upper lid 4, and the room-temperature polymerized resin a is absorbed. Because the heating is uniform, the denture A has excellent compatibility and high molding accuracy without causing shape distortion to the denture A.
can be obtained. In addition, the water vapor c generated by heating the water contained in the plaster mold 11 is transferred to the water vapor passage section 2.
Since it diffuses to the outside of the flask 1 through the air, it is possible to prevent the room-temperature polymerized resin a from changing its shape during post-curing. Moreover, by generating the water vapor C and dissipating it to the outside, it is possible to prevent the inside of the flask 1 from overheating.

In the manner described above, a denture A with high molding accuracy can be obtained in a short post-curing time, as shown in FIG. 5, by using the room-temperature polymerized resin a having a small coefficient of thermal expansion.

The present invention can be configured in various ways other than those shown in the above embodiments. For example, in the flask of the above embodiment, the microwave passage section and the water vapor passage section may be used both.

(Effects of the Invention) Since the method for manufacturing dentures of the present invention has the above-described structure and function, the post-curing time of room temperature polymerized resin can be significantly shortened.
Dentures with high molding accuracy can be manufactured in a short time.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view of a flask used in an example of the present invention, FIG. 2 is a longitudinal sectional view thereof, and FIG. 3 is a partially cutaway side view showing a state in which a cold polymerization resin is inserted into a plaster mold. FIG. 4 is a longitudinal cross-sectional view showing the state in which the flask is irradiated with microwaves, and FIG. 5 is a perspective view showing the completed denture. 1...Flask, 1a...Upper case, 1b...Lower case, 2...Steam passage section, 3...Microwave passage section, 11...Gypsum mold, a...Room temperature polymerized resin, b...Microwave ,A...Dentures.

Claims (1)

[Claims] 1. A prototype model is buried in a flask to form a plaster mold, and then a room temperature polymerization resin is injected into this plaster mold and cured by polymerization, and then the flask is irradiated with microwaves to post the room temperature polymerization resin. A method for manufacturing a denture with a set of dentures, which is characterized by curing.