JPS5854093Y2 - Cone truncated for casting dental prostheses, etc. - Google Patents

Description

[Detailed description of the invention] This invention is a cone for casting dental prostheses, ornaments, etc., and more specifically, a casting hole is used when filling a wax shape into an iron ring for casting with a embedding agent such as plaster. It concerns the truncated cones used to make them.

The casting process for a dental prosthesis involves creating a casting channel 2 in a wax shape 1 with wax, fixing it on a truncated cone 3, as shown in Fig.
An iron ring 4 is placed on the outside and a embedding agent 5 such as plaster is injected.

After the plaster hardens, the truncated cone 3 is removed, heated to melt and burn the wax mold 1, and then heated and dried.

In this way, a cavity 6 is formed in the portion of the wax shape 1.

Thereafter, as shown in Figure 2, a metal 8 is placed in the recess 7 from which the truncated cone 3 has been removed, and the metal 8 is melted and injected into the wax-shaped cavity 6 using pressure or centrifugal force to create a cast body. .

As a conventional truncated cone, a circular truncated cone 1 is used as shown in Fig. 3.
1, a bowl-shaped part 13 is connected to the angular step part 12, and a conical part 14 is connected to the circular platform 11, as shown in FIG. As shown in Fig. 5, the flange 15
There is one in which a bowl-shaped part 16 is connected to a circular base 11, and each part is made of rubber, metal, wood, or the like.

However, the one in Figure 3 is bowl-shaped, so metal tends to remain, requiring a large amount of metal, and the plaster surface is rough, creating a large resistance to the flow of metal, and it also has the disadvantage of easily adhering to phosphoric acid-based burial agents. .

Furthermore, the spool 17 shown in FIG. 4 is too thin, making it impossible to cast a large prosthesis, and also having the disadvantage that the contact stability of the iron ring 4 is poor.

The one shown in FIG. 5 is exclusively for centrifugal casting, and has the disadvantage that the iron ring 4 is strongly pressed by the rubber collar 15 and the plaster, making it difficult to remove the iron ring 4, and the plaster surface is rough, making it easy for plaster to stick to it.

The purpose of this invention is to provide a truncated cone for casting dental prostheses etc. that can eliminate these conventional drawbacks.
Its features include a conical part with an inclined surface of 45 degrees, a polygonal base part, a step part with multiple rounded surfaces provided at the bottom of the outer peripheral surface of the conical part, and a tapered wax insertion hole. This is because it is made of plastic and molded into a truncated conical frame.

Furthermore, the structure and operation of an embodiment of this invention will be explained with reference to illustrative drawings.

As shown in Figures 6 and 7, a plastic frame-shaped truncated cone a
21 is the horizontal base of the hexagon, and the angle is approximately 45°.
A conical portion 23 having a straight inclined surface 22 is connected thereto.

Reference numeral 24 denotes a stepped portion of a rounded convex surface 25 that is continuous in multiple steps at the lower part of the outer circumferential surface of the conical portion 23.

26 is a tapered niterity wax insertion provided at the top, which tapers from the large diameter part 11 toward the small diameter lower mouth part.

Although the base is shown as a hexagon, it may be any polygon.

Further, it is desirable that the stepped portion be about 3 to 6 steps.

For example, the wall thickness of the bottom portion 21 may be approximately 5 mm, the thickness of the conical portion 23 may be approximately 4 mm, and the diameter of the lower opening of the insertion hole 26 may be approximately 3 mm minus the diameter of the first opening portion of approximately 5 mm.

By using such a truncated cone a, a concave portion 27 as shown in FIG. 8 is formed on the surface of the plaster 28.

Reference numeral 30 denotes a cavity having almost the same shape as the conical portion 23 formed inside the truncated cone a.

Since this invention is constructed as described above, it has the following effects.

That is, first, the inclined surface 22 of the conical portion 23 is set at approximately 45°.
Since the molten metal is formed to have a relatively large contact area with the flame, uniform and rapid melting occurs, the degree of oxidation is also relatively low, and the molten metal sweats smoothly into the mold.

In this case, since the truncated cone a is made of plastic, the conical surface has good smoothness, so that the molten metal sweats out more smoothly.

First, since the truncated cone is made of plastic and the stepped portion 24 is formed by a rounded convex surface 25, the conical surface has good smoothness and can be easily removed from the plaster 28 without being hindered by the stepped portion 24. The plaster surface after separation becomes smooth.

Therefore, there is no risk of straining when removing the truncated cone from the plaster, damaging the plaster and causing its fragments to flow in together with the metal, unlike in the prior art.

Thirdly, since a plurality of stepped portions 24 formed by rounded convex surfaces 25 are provided at the lower part of the outer peripheral surface of the conical portion 23, it becomes an economical truncated cone a that can be adapted to rings 29 of various types of large and medium-sized vehicles.

The ring 29 has a convex surface 25 that allows it to fit into the punch, providing stability.

Fourthly, the knee-tilty wax insertion hole 26 is provided at the top of the conical portion 23 in a tapered shape such that the diameter decreases from the upper opening to the lower opening, making it easy to press fit the knee-tilty wax. It can be used regardless of the diameter of the spool wire.

Fifth, since the polygonal base portion 21 is provided, the truncated cone a can be easily rotated and removed from the plaster 28.

Sixth, by color-coding the plastic by dyeing it red, blue, green, yellow, or black, each person can determine the type of casting metal burying material and the type of work. :, it is possible to prevent misidentification, etc.

Seventh, since the truncated cone a is molded in plastic into a frame, that is, an umbrella shape, several pieces can be stacked and stored and organized in a small space.

Eighthly, since the conical portion 23 is formed with a 45° inclined surface, it has a great practical effect in that compression casting, suction casting, centrifugal casting, etc. can all be used.

Furthermore, Utility Model Application Publication No. 9478 of 1929 has been proposed as a material made of rubber or wood, but since the conical part is small, the contact area of the molten metal with the flame is small, and it takes time to melt. In addition, the gypsum surface is rough and has a high resistance to metal flow, making it easily resistant to phosphoric acid-based embedding agents.

However, in this design, the straight inclined surface 2 of approximately 45°
2, the contact area of the molten metal with the flame is relatively large, resulting in uniform and deep melting, and the degree of oxidation is also relatively low.

Furthermore, since it is made of plastic, the plaster surface of the recessed portion 27 becomes a smooth surface, allowing the metal to flow smoothly and melting more quickly.

In addition, in the conventional publication mentioned above, the spool is too thin, making it difficult to press in the wax and making it impossible to cast a large prosthesis. Since the diameter is gradually increased, the wax can be easily press-fitted from the large-diameter spout side, and can be adapted to the size of the prosthesis.

In addition, since the stepped part of the conventional publication mentioned above is square, it is difficult to fit or easily gets stiff due to the error with the diameter of the iron ring. - When removing the truncated cone from the plaster, it is difficult to remove it from the plaster, causing damage to the plaster. It's easy to do.

Therefore, the number of stepped portions cannot be increased.

However, in this invention, the step portions 24 of the plurality of rounded convex surfaces 25 having an inclination of approximately 45° are formed into the conical portion 1.
4, the iron ring 29 can be snapped into place via the rounded convex surface 25, resulting in stability.
Since it can be easily separated from the plaster 28, it is possible to form it in multiple stages, and it can be applied to various types of rings 29.

Further, since the base of the conventional publication is circular, it is difficult to rotate the truncated cone and separate from the plaster, and it is inconvenient to store it because there is no cavity for overlapping inside.

However, in this design, since the base is square, it is easy to create a hook, and it is easy to rotate the truncated cone a and separate it from the plaster, and since there is a cavity 30 inside, it can be stored stacked in multiple stages, and it is thin and lightweight as a whole. This makes it convenient to handle.

[Brief explanation of drawings]

The drawings show an embodiment of this invention; FIGS. 1 and 2 are explanatory views, FIGS. 3 to 5 are perspective views of the conventional technology, FIG. 6 is a perspective view of this invention, and FIG. 7 is a cross-sectional view of the same. 8 are cross-sectional views. 21...Base portion, 22...Slope surface, 2
3...Conical part, 24...Step part.

Claims (1)

[Scope of utility model registration request] This is a truncated cone made of plastic for casting, which has a plurality of rounded convex steps with an inclination of approximately 45° above the square base, and an approximately 45° angle extending above the steps. A conical part with a straight inclined surface is integrally molded with plastic to form a polymerization cavity that is almost the same shape as the conical part, and a wax insertion hole provided at the top of the conical part is inserted from the inner opening side to the ascending opening side. A truncated cone for casting dental prostheses, etc., characterized in that it is formed to gradually increase in diameter.