JPS6141448A - Production of denture floor - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention <Industrial Application Field> The present invention comprises a flask by stacking a plurality of flask division bodies on top of each other at their division surfaces and fixing them with a fixing means, and dividing a wax pattern within the flask. A denture base is manufactured by enclosing the denture base with an investment material along almost parallel to the surface, dewaxing the wax pattern from within the investment material, and press-fitting the denture base material into the pattern space left there. Regarding how to.

<Prior art> The prior art related to the method of manufacturing a denture base described in - is disclosed, for example, in Japanese Patent Publication No. 57-2023.

In such conventional technology, about 1000 to 150 denture base materials made of synthetic resin are injected into the pattern space using an injector.
Although it is injected at a pressure of 0 kg/cn+2, it must be assembled into a pressure-resistant flask that can withstand this pressure. For example,
The periphery of the lower flask and the second part 7 Rasp was fixed with a fastener made of bolts, nuts, etc.

<Problems to be solved by the invention> In general, denture bases must be comfortable to use by the person using them, and for this reason, when manufacturing denture bases, it is necessary to Extremely high precision is required for remanufactured denture bases.

However, the conventional method of fixing divided flask parts is to fix the periphery with a fastener as described in 2.In the case of divided flask parts made of aluminum or the like, the central part is usually used for the denture base. When the material is press-fitted, it expands and deforms in units of several micrometers, and for example, the thickness of the thinnest central part of the denture base increases, causing problems such as a discomfort felt by the person using the denture base.

The present invention was made in view of the above circumstances, and its purpose is to provide a method for manufacturing a highly accurate denture base by preventing the central part of the flask from being deformed by the pressure applied to the denture base. It is.

<Means for Solving the Problems> In order to achieve the object 1, the present invention provides a fixing means 1 by overlapping a plurality of divided flask bodies 1 with each other at their dividing surfaces 44.
8 to form a flask. Within the flask 1, the wax pattern 8 is surrounded by investment material 9 along approximately parallel to the dividing surface 44, and the wax pattern 8 is dewaxed from within the investment material 9. In the method of manufacturing a denture base by press-fitting the denture base material 42 into the pattern space 8a left in the pattern space 8a, the pressing force F of the fixing means 18 is applied to the flask segment 1.
The material 42 for the denture base is press-fitted into the pattern space 8a by pressing the denture base material 42 into the pattern space 8a.
The pressing force F of the fixing means 8 is made to oppose the pressure of the denture base material 42 acting on the peripheral wall surface of the pattern space 8a, thereby suppressing expansion and deformation of the denture base in the thickness direction. This is a method for manufacturing a denture base characterized by the following.

<Example> Embodiments of the present invention will be described below based on the drawings.

The drawings show an example of an apparatus for carrying out the method of the present invention, in which Fig. 1 is a longitudinal sectional front view of main parts, Fig. 2 is a longitudinal sectional side view, Fig. 3 is a divided perspective view of a flask, and Fig. 4 is a cross-sectional view of the main part. It is a right side view.

In the figure, reference numeral 1 denotes a flask with two shapes, left and right, and the upper wall of this flask 1 has an injection port 2 for injecting resin, which is a denture base material, and an investment material 9 made of plaster or the like is injected. In addition, a dewaxing inlet 4 is opened in the lower wall of the flask 1. Further, a positioning groove 5 is recessed in the front half of the lower wall of the flask 1 and runs from side to side.
A heated fluid circulation section 6, a heated fluid circulation groove 7 communicating therewith, and a conductor introduction section 45 are formed on the left and right side walls of the flask 1, and the heated fluid circulation section 4 is formed in the center of the left and right side walls. A pressing protrusion 46 surrounded by 6 is formed,
This pressing protrusion 46 is provided on the same plane as this side wall surface, or rather protrudes slightly from this side wall surface, and is formed so that a pressing force F by a flask fixing means 18, which will be described later, is applied to this pressing protrusion 46.

FIG. 5 is a diagram showing a state in which a wax pattern 8, which is a denture base model, is embedded and fixed in an investment material 9 made of plaster or the like in the flask 1, and FIG. 6 is a cross-sectional view taken along the line VI-VI. It is a diagram.

As shown in FIG. 6, this wax pattern 8 is surrounded and fixed with investment material 9 along substantially parallel to the dividing surface 44 of the flask 1, and then, as shown in FIG. A spool wax 10 is drawn out from the upper end of one side of the bed, and its free end is positioned and connected to the resin injection port 2 of the flask 1, and a vent wax 11 is drawn out from the upper end of the other side of the wax bed. and its free end is positioned within the said derolling roller 4 of the 7-rasf 1.

In FIGS. 5 and 6, reference numeral 47 is a tongue-like projection formed on the inner wall surface of one of the flask segments 1, and this tongue-like projection 47 is designed to correspond to the concave portion of the denture base wax pattern 8. When the re-resin is formed and dewaxed by heating the flask 1 and is press-fitted into the pattern space 8a and then polymerized and dried, the heating is uniformly performed through the investment material 9, thereby producing a highly accurate denture base. It is set up for the purpose of

In FIGS. 1 and 2, the reference numeral 12 is a flask case, and two sides of the flask case 12 are largely opened to form a flask inlet/outlet 13, and a dewaxing hole 14 is formed in the lower wall of the flask case 12. are lined up on the left and right. A positioning key 15 is fixed on the front half of the lower wall of the flask case 12, and a sliding guide groove 17 for the sliding lid 16 is formed in the dewaxing hole 14-shaped section. A clamp 18 made of a hydraulic sill is fixed to the left wall of. flask case 12
There is a steam inlet hole (heated fluid inlet hole) 19 at the lower left end of the rear wall.
is opened, a steam outlet hole 20 is opened at the lower right end, and the steam manifold port 19 is connected to an electromagnetic steam manifold valve 21.

A plurality of flasks 1 are positioned in the front-back direction in the flask case 12 by fitting the positioning grooves 5 and the positioning keys 15, and are pressed against the receiving protrusion 22 formed protrudingly on the right wall of the flask case 12 by the clamp 18. and fixed. In this state, the dewaxing roller 4 of the flask 1 is located concentrically with the dewaxing hole 14 of the 7 flask case 12 above and below.

As shown in FIG. 7, the sliding lid 6, which slides in the sliding guide groove 17 formed on the lower wall of the flask case 12, is connected to the de-waxing 4 of the flask 1 and the flask case 12 in the 7-rast offset state. Communication hole 23 communicating with dewaxing hole 14
is transparently provided, and a sealing ring 24 made of rubber is supported at the two halves of this communication hole 23.

The flask inlet/outlet 13 of the flask case 12 is shown in FIG.
A case lid 25 shown in , ) is arranged to be detachable and openable, and a plurality of insertion holes 26 are opened in the case lid 25 in correspondence with the resin injection ports 2 of each flask 1 in the flask set state.

Each suppression device 27 made of a hydraulic sill is arranged above each insertion hole 26, and each suppression device 27 is connected to the flask case 12.
are relatively fixed to each other via a connecting frame 28. Each pressing device 27
The output rod 29 is configured to be able to be driven forward and backward relative to each insertion hole 26 from above.

In FIG. 2, a vertical dewaxing fluid introduction pipe 30 is arranged inside the flask case 12 along the rear wall of the flask case, and a dewaxing fluid introduction passage 31 is formed within this introduction pipe 30. .

A dewaxing lid 32 for pressurizing the dewaxing fluid shown in FIG. 8(l) into the resin inlet 2 of the flask 1 housed in the flask case 12 is removably attached to the case lid 25 as shown in FIG. A dewaxing fluid passage 33 is transparently provided in the dewaxing lid 32, and the inlet side of the dewaxing fluid passage 33 is connected to the dewaxing fluid introduction passage 31 of the flask case 12, so that the waxing The outlet side of the wax fluid passage 33 is connected to the resin inlet 2 of the flask 1. The dewaxing fluid introduction passage 3
1 is connected to a steam S supply path 34 and a water W supply path 35, and each supply path 34 and 35 is connected to a solenoid valve 36.
・37 is placed. The solenoid valves 36 and 37 are controlled to open and close based on the operation of detecting the temperature inside the flow path by a temperature sensor disposed at the entrance of the dewaxing fluid introduction path 31.

A wax recovery tank 38 is removably attached to the lower side of the flask case 12, and the wax recovery tank 38 is provided with a drain pipe 39 and a wax-blocking cylindrical lid 40 surrounding the drain pipe 39. .

When injecting the resin, instead of the dewaxing lid 32, a resin guiding cylinder 41 shown in FIG. 8(C) is attached to each insertion hole 26 of the case lid 25, as shown in FIG. 10. The resin 42 is press-fitted into and removed from the pattern cavity formed in the investment material 9 by a pressing device 27.

Incidentally, reference numeral 48 in FIG. 2 is an outlet for attaching and detaching the flask 1, case lid 25, and dewaxing lid 32 through access. Further, reference numeral 43 in FIG. 7 is a cylinder on which the sliding lid 16 slides.

Next, the procedure for carrying out the method of the present invention using the above-mentioned apparatus will be explained.

A. Preparation Step The flask 1 is set in a predetermined position in the flask case 12 via the positioning key 15, and the pressing protrusion 46 of the seventh flask 1 is pressed and fixed using the waist clamp 18. 7 Cover the Raspf entrance 13 with a case lid 25. As shown in FIG. 9, the dewaxing lid 32 is superimposed on the case lid 25-1-, and the dewaxing fluid passage 33 is communicated with the resin injection port 2 of the flask 1. Dewaxing lid 3 with two outlet rods of pressing device 37
2 from -1- to f1 to fix it.

B. Dewaxing process Then, when the steam population valve 21 is opened, steam flows into the flask case 12 and heats the flask 1 with the heat retained in the steam, thereby softening the wax pattern 8 inside the flask 1. .

In this state, the dewaxing fluid introduction path 31 is communicated with the steam supply path 34 and the water supply path 35, and the inside of the dewaxing fluid introduction path 31 is opened and closed by opening and closing each solenoid valve 36 and 37 based on the temperature detection operation of the temperature sensor. Steam S and water W are alternately supplied to. That is,
When the temperature sensor detects that the dewaxing fluid introduction path 31 has been overheated due to the supply of steam S, the steam supply path 34 is closed late, the water supply path 35 is opened, and water W is introduced into the dewaxing fluid introduction path 31. supply. Then, the water is heated by the heat in the dewaxing fluid introduction path 31 and the dewaxing fluid passage 33,
The high temperature water H turns into high temperature water and is ejected from the resin injection port 2 into the flask 1. Furthermore, when the temperature sensor detects that the temperature has dropped below a certain level, the water supply path 35 is closed late, and the steam supply path 34 is opened to eject steam S into the flask.

As a result, steam S and high-temperature water (■) are alternately ejected into the flask 1, and the wax pattern 8 is forced out from the dewaxing roller 4 of the flask 1 with both high-temperature fluids S-1-(.

At this time, the spool wax 11 is attached to the wax pattern 8.
Since the vent wax 13 is connected to one end of one side, and the bent wax 13 is connected to one end of the other side of the wax pattern 8, the wax pattern 8 is completely exposed to the high-quality fluid S-H. It will definitely be ejected.

Furthermore, since steam S and high-temperature water H are alternately supplied into the flask 1, the high-temperature, high-pressure, and well-diffusible steam S flows into the details of the pattern space 8a, melts and flows out the wax, and reduces the mass. Discharge the melted wax to the outside of the flask 1 with a large amount of high-temperature water I4.

In the wax recovery tank 38, steam and excess water are drained through a drain pipe 39.
The wax is prevented from being discharged by the wax blocking cylinder lid 40 and remains in the wax recovery tank 38 while floating in water, thereby preventing pollution caused by the discharge of the wax.

C3 Molding Step The dewaxing lid 32 is removed from the state shown in FIG. 2 or 9, and each cylinder 41 is inserted into each insertion hole 26 and placed on the flask 1, as shown in FIG. A rice cake-shaped resin material 41 is put into each cylinder 41, and the output lot 29 of each pressing device 27 is pushed into each cylinder 41 by hydraulic pressure to press the resin material 42.

Then, the resin material 42 flows from the injection port 2 into the pattern space 8.
After being pushed into and filled with the resin material 4, by continuing to pressurize it in the output lot 29 for a predetermined period of time, the resin material 4
2 is press-fitted into every corner of the pattern space 8a with high precision and high density, and molding is performed.

After this, the cylinder 41 is removed.

= 12 - D1 Polymerization Step When the resin material 42 is self-hardening, the resin 42 is continuously pressurized in the output lot 29, or the 7 Rasf 1 is taken out from the flask case 12 and the resin 42 is not pressurized. , leave to stand for a predetermined period of time to polymerize.

If the resin material 42 is thermosetting, the output lot 29
While the resin 42 is kept pressurized, the steam inlet valve 36 is opened and steam is passed into the flask case 12 for a predetermined period of time, thereby heating the flask 1 and melting the resin material molded inside the flask 1. 42 is heat cured.

When the resin 42 is polymerized while being kept under pressure in the output lot 29, a particularly dense and durable resin-based denture can be formed.

After this polymerization step, the flask 1 is split open, the investment material 9 is broken down, and the resin base denture formed therein is taken out. Furthermore, the resin material that has been thermoset within the cylinder 41 shrinks upon cooling, so it can be easily removed from the cylinder 28.

In the above embodiment, a case where a large number of flasks are clamped at once has been described, but it is also possible to clamp seven flasks one by one.

<Effect of the invention> According to the present invention, the following excellent effects are achieved.

B. The conventional method of fixing the outer periphery of the flask because the pressing force of the fixing means is applied to the central part of the outer wall surface of the divided flask body in opposition to the pressure of the denture base material press-fitted into the pattern space. Compared to the above, the wall thickness of the thinnest central part of the denture base is suppressed from expanding and deforming, and the user does not experience discomfort such as discomfort.

According to the fixation method described above, the flask segments do not require rigidity to withstand the pressure of the denture base material, so the wall thickness can be reduced to save materials and reduce costs.

[Brief explanation of drawings]

The drawing shows an example of the apparatus used to carry out the method of the invention,
Figure 1 is a front view of the main part, Figure 2 is a side view of the main part, Figure @3 is a perspective view of the flask, Figure 4 is a right side view of Figure 3, and Figure 6 is a side view of the main part. Figure 7 is an enlarged view of section V in Figure 1, Figures 8 (a) to (c) are perspective views of parts belonging to Class A, Figures 9 and 10 are used. FIG. 2 is a longitudinal sectional front view of a main part showing a process. 1...Flask, 2...Resin monthly interest inlet, 4
... De-rolling, Wax pattern, 8a.
...Pattern space, 9...Investment material, 18...
- Flask fixing means, 42... Denture base material, 4
4... Flask dividing surface, F... Pressing force. Procedural amendment band (method) December 1980 11 1. Indication of the case 1982 Patent Application No. 162642 2. Name of the invention Method for manufacturing a denture base 3. Person making the amendment Relationship to the case Patent applicant name Name: Shiro Okamoto 4, Add text of main part plan 4 with fixed agent.

Claims (1)

[Claims] 1. A flask is constructed by stacking a plurality of flask division bodies 1 on top of each other at their division surfaces 44 and fixing them with fixing means 18;
Inside the flask 1, the wax pattern 8 is surrounded by an investment material 9 along almost parallel to the dividing surface 44, and the wax pattern 8 is dewaxed from within the investment material 9, and a denture base is placed in the pattern space 8a left there. In the method of manufacturing a denture base by press-fitting the material 42, the pressing force F of the fixing means 18 is applied oppositely to the central part of the outer wall surface parallel to the dividing surface 44 of the flask divided body 1, thereby forming a pattern. The denture base material 42 is press-fitted and overlapped in the space 8a, and the pressing force F of the fixing means 18 is made to oppose the pressure of the denture base material 42 acting on the peripheral wall surface of the pattern space 8a, and the denture base material 42 is pressed in the thickness direction of the denture base. A method for manufacturing a denture base characterized by suppressing expansion and deformation of the denture base.