JPH0595967A - Method and apparatus for burying wax pattern for manufacture of resin bedded denture - Google Patents

Abstract

PURPOSE:To improve workability while producing a highly accurate resin bedded tooth by burying a way pattern into a gypsum slurry easily without mixing bubbles. CONSTITUTION:A gypsum weighing means A is provided to weigh gypsum 4a which is required to prepare a gypsum slurry allowing the burying of one wax pattern for producing a resin bedded denture and a stir up means 12 which mixes the gypsum 4a with water to prepare a gypsum slurry. In addition, a water/gypsum mixing means B is provided including an shutoff valve 13 which passes the total amount of the gypsum slurry after the preparation one at a time to be supplied to a burying flask C and a burying flask C which houses one wax pattern allowing the injection of the gypsum slurry under a reduced pressure.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wax pattern burying method and a wax pattern burying apparatus for burying a wax pattern for producing a resin denture in a gypsum slurry to prepare a mold for producing a resin denture.

[0002]

2. Description of the Related Art Conventionally, the problems to be solved by the invention
When manufacturing a resin denture, a wax pattern for manufacturing a resin denture, which is formed by embedding the denture in wax,
For example, a mold for resin filling is created by embedding in an investment material such as gypsum slurry and hardening it, and then removing the wax.

That is, in the conventional method for producing a resin denture, for example, a wax pattern is put in an upper and lower divisible buried flask, and first, gypsum slurry is poured into the lower flask to be hardened, and then the upper flask. Put the gypsum slurry into the gypsum slurry, bury the wax pattern in the gypsum slurry, and after hardening, divide the gypsum into two to create a mold for filling the resin material, and fill the mold with the resin material to produce a resin denture. is doing.

However, the above-mentioned conventional method has a problem that air bubbles are mixed in the gypsum slurry at the time of burial and defects are likely to occur. And to bury the wax pattern so that air bubbles do not mix in the gypsum slurry,
There is a problem that skill is required and a skilled person needs to manually mix and inject the gypsum, resulting in poor production efficiency and increase in manufacturing cost.

Further, the gypsum slurry is liable to harden, and if a large amount of gypsum is mixed together with water, it hardens during use and hinders work, resulting in poor workability.

Further, in the conventional method, since it is necessary to open the flask and the gypsum, there is a problem that the accuracy of the resin denture is lowered due to the presence of a seam and the deviation of the closing surface. is there.

The present invention solves the above-mentioned problems, requires no skill, can easily bury the wax pattern in the gypsum slurry without mixing air bubbles, and can form a gypsum mold. An object of the present invention is to provide a wax pattern burying method and a wax pattern burying apparatus capable of manufacturing a resin denture with high accuracy without the need for splitting.

[0008]

In order to achieve the above object, a wax pattern burying method for producing a resin denture according to the present invention is a wax pattern 1 for producing a resin denture.
Gypsum required to prepare a gypsum slurry capable of burying individual pieces is measured and transferred to water / gypsum mixing means, and a gypsum slurry is prepared by mixing with a predetermined amount of water, and the total amount of the gypsum slurry is The wax pattern is embedded in the gypsum slurry by injecting the wax pattern into a pressure-reduced embedding flask.

The wax pattern burying device of the present invention is a gypsum measuring means for measuring the gypsum required to prepare a gypsum slurry capable of burying one wax pattern for producing a resin denture, and the gypsum. To prepare a gypsum slurry by mixing water with water, stirring means and water / gypsum mixing means equipped with an on-off valve for supplying the entire amount of the prepared gypsum slurry at one time to the following buried flask, and under reduced pressure And a buried flask containing one wax pattern capable of injecting the gypsum slurry.

The buried flask has a dewaxing port and a resin injection port for dewaxing after hardening of gypsum,
In addition, it is preferable to use a buried flask in which the dewaxing port and the resin injection port are sealed with wax until the dewaxing step.

The on-off valve of the water / gypsum mixing means is provided with a hollow valve body made of an elastic material and a gas supply line, and a gas such as air is press-fitted to expand the valve body. By using the on-off valve configured to open the passage of the gypsum slurry by closing the passage of the gypsum slurry by discharging the gas press-fitted and contracting the valve body, It is preferable to inject the entire amount of the gypsum slurry into the buried flask in a short time while preventing it.

[0012]

In the method for burying a wax pattern for producing a resin denture according to the present invention, the gypsum required to prepare a gypsum slurry for burying the wax pattern is measured for each wax pattern and after mixing with water. , The whole amount is supplied under reduced pressure to the buried flask containing the wax pattern,
Since it is injected, there is no risk that the gypsum will solidify during use, and it becomes possible to bury the wax pattern in the gypsum slurry easily and reliably, and reliability is improved. Further, since the gypsum slurry is injected into the buried flask under reduced pressure, air bubbles are not mixed and a good resin filling mold can be obtained.

Further, in the wax pattern burying device of the present invention, the wax pattern 1 is made by the gypsum measuring means.
A predetermined amount of gypsum is measured for each piece and supplied to water / gypsum mixing means, where the gypsum slurry is adjusted by mixing with water, and the entire amount of this gypsum slurry is supplied to the pressure-reduced buried flask. .. Therefore, it is possible to easily and surely bury the wax pattern in the gypsum slurry without any step requiring manual work, and the workability is greatly improved.

Further, by using a buried flask equipped with a dewaxing port and a resin injection port, and by putting a wax pattern into this and injecting a gypsum slurry, the gypsum is dewaxed without cracking and the formed space is formed. Since it can be filled with resin, the precision of the resin denture does not decrease due to the presence of seams and the deviation of the closing surface, etc., as in the conventional example. It becomes possible to manufacture a denture.

Further, when an opening / closing valve having a hollow valve body made of an elastic material and a gas supply line is used as the opening / closing valve of the water / gypsum mixing means, the valve is formed by pressurizing a gas such as air. The body expands and the passage of the gypsum slurry is closed, and the valve body is contracted by discharging the press-fitted gas to open the passage of the gypsum slurry. Therefore, it is not necessary to provide the valve body with complicated irregularities, it is possible to reliably prevent the gypsum slurry from being accumulated, and it is possible to inject the entire amount of the gypsum slurry into the buried flask in a short time. It is possible to prevent the gypsum from solidifying and significantly improve the reliability.

[0016]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a diagram showing a wax pattern burying apparatus for manufacturing a resin denture according to an embodiment of the present invention. The wax pattern burying device of this embodiment is capable of burying a buried flask C for housing a resin denture and one wax pattern (not shown) for manufacturing a resin denture housed in the buried flask C. Gypsum weighing means A for weighing gypsum necessary for preparing a gypsum slurry,
It is provided with water / gypsum mixing means B for preparing a gypsum slurry by adding the gypsum measured by the gypsum measuring means A and mixing it with a predetermined amount of water for a predetermined time.

The gypsum metering means A has a valve (not shown) at the bottom.
A cylindrical container 1 provided with, a rod 6 supporting the cylindrical container, a sensor 2 for weight detection, and the cylindrical container 1 is moved downward when the gypsum is supplied to the water / gypsum mixing means B. And a cylinder 3 for inserting the lower portion (gypsum outlet) of the tubular container 1 into the water / gypsum mixing means B, and the sensor 2 measures the weight of the gypsum 4a supplied from the gypsum storage container 4 via the feeder 5. The gypsum 4a is supplied from the gypsum storage container 4 until it reaches a predetermined weight.

The water / gypsum mixing means B is composed of the main body 11
And a stirring blade (stirring means) 12 arranged in the main body 11
And an opening / closing valve 13 opened when the gypsum slurry prepared by mixing with water is supplied to the buried flask C. The stirring blade 12 is arranged outside the main body 11 via a gear 14 and is rotationally driven by a motor (not shown). The on-off valve 13
Includes a valve body 15 made of a hollow elastic body (rubber in this embodiment) and an air line (gas supply line) 16 for supplying compressed air to the valve body 15, and the compressed air is supplied from the air line 16. The gypsum slurry discharge port 17 of the main body 11 is closed by supplying and expanding the valve body 15,
The gypsum slurry discharge port 17 is configured to be opened by discharging air from the valve body 15 and contracting the valve body. Note that FIG. 1 shows a state in which the valve body 15 is contracted, that is, a state in which the gypsum slurry discharge port 17 is opened. Further, the water / gypsum mixing means B is configured to move laterally by the cylinder 18, and water (quantitative water for preparing gypsum slurry or washing water) is supplied from the water supply means 19 at the moved position. , And is then configured to return to its original position. The water supply means 19 is a water injection part 19
a and a cylinder 19b for lowering the water injection part 19a at the time of water injection and injecting water with the water injection part 19a inserted in the main body 11 of the water / gypsum mixing means B.

Further, the buried flask C is disposed below the water / gypsum mixing means B, and is constructed by combining the upper lid 21 and the lower lid 22 thereof with the cylindrical main body 23, and the gypsum slurry is decompressed. A vacuum line 25 is connected so that can be injected. Further, the buried flask C is configured to be disengaged from the water / gypsum mixing means B by being moved in the vertical direction by the cylinder 24. Further, in the bottom portion (lower lid) 22 of the buried flask C, a dewaxing port (not shown) for melting and flowing out the wax forming the wax pattern, and a resin for injecting the resin into the cavity after the dewaxing. A pouring port (not shown) is provided, and the dewaxing port and the resin pouring port are sealed with wax common to the wax pattern in the step of pouring the gypsum slurry.

Next, a process for burying a wax pattern using the above wax pattern burying device will be described.

When burying the wax pattern, first, the wax pattern is stored in the burial flask C. Then, the gypsum weighing means A measures a predetermined amount of gypsum. Then, this gypsum is dropped into the water / gypsum mixing means B into which a predetermined amount of water has been injected from the water supply means 19.

After the gypsum and water are mixed for a predetermined time in the water / gypsum mixing means B to prepare a gypsum slurry, the water / gypsum mixing means B is sucked from the vacuum line 25 to reduce the pressure in the buried flask C. The air is discharged from the valve body 15 of the opening / closing valve 13 of the above and contracts the air, and the gypsum slurry discharge port 1
The gypsum slurry is poured into the embedded flask C from 7 to bury the wax pattern in the gypsum slurry.

Then, the water / gypsum mixing means B after supplying the whole amount of the gypsum slurry to the buried flask C is placed in the cylinder 18.
To move laterally by pouring water into the main body 11 from the water injection portion 19a to wash off the gypsum slurry adhering to the main body 11 to prevent the gypsum from solidifying in the main body 11 and to mix the next water and gypsum. Prepare for the process.

On the other hand, the buried flask C in which the wax pattern is buried as described above is sent to a heating furnace for accelerating the curing and heated. Then, after the plaster is solidified, the buried flask C is immersed in a dewaxing bath, for example, about 9
Hot water of 0 ° C. is poured into a buried flask through a resin injection port (a separate hot water injection port may be provided) to melt the wax and perform dewaxing. In this case, the buried flask C
And since the contents thereof are heated, the dewaxing is performed efficiently and promptly. It should be noted that the buried flask C sequentially moves in a plurality of baths, and hot water is repeatedly injected. In this way, after the wax has been sufficiently washed off from the buried flask C, in the final stage, new hot water is poured to thoroughly wash the cavities in the gypsum.

Next, the buried flask C is sent to the drying step,
After drying and cooling, a mold release agent for improving the mold release property with the resin is injected. Then, the release agent is poured out and pressurized to sufficiently attach the release agent to the cavity wall.

Then, the buried flask is sent to a resin injecting step, the cavity is injected and filled with resin, and then the resin is cured to manufacture a resin denture.

[0028]

As described above, according to the wax pattern burying method for producing a resin denture according to the present invention, gypsum is measured for each wax pattern, and after mixing with water,
Since the whole amount is supplied and poured into the buried flask, there is no fear that the gypsum will solidify during use, and reliability and workability are improved. Furthermore, since the gypsum slurry is poured into the burying flask under reduced pressure, the bubbles in the gypsum slurry are surely removed, the wax pattern is surely buried, and a good resin filling mold can be obtained.

According to the wax pattern burying device of the present invention, a predetermined amount of gypsum is weighed for each wax pattern by the gypsum weighing means, and the gypsum is supplied to the water / gypsum mixing means to be mixed with water. After the slurry is prepared, since the entire amount is supplied to the pressure-reduced embedding flask, there is no step that requires manual work, and it becomes possible to bury the wax pattern in the gypsum slurry easily and reliably, Workability is greatly improved.

Further, by using the buried flask provided with the dewaxing port and the resin injection port, the precision of the resin denture does not decrease due to the displacement of the closing surfaces as in the conventional example, and the resin with high precision can be obtained. Dentures can be manufactured.

Further, by using an open / close valve provided with a hollow valve body made of an elastic material and a gas supply line as the open / close valve of the water / gypsum mixing means, it is possible to surely prevent the accumulation of the gypsum slurry, and It is possible to inject the entire amount of the slurry into the buried flask in a short time, prevent the gypsum from solidifying in the water / gypsum mixing means, and significantly improve the reliability.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of a wax pattern burying apparatus for manufacturing a resin denture according to an embodiment of the present invention.

[Explanation of symbols]

 A gypsum measuring means B water / gypsum mixing means C buried flask 4a gypsum 12 stirring means (stirring blade) 13 on-off valve 15 valve body 16 gas supply line

Claims (4)

[Claims] 1. A gypsum required for preparing a gypsum slurry capable of burying one wax pattern for producing a resin denture is measured, transferred to a water / gypsum mixing means, and mixed with a predetermined amount of water. Prepare a gypsum slurry by doing
By injecting the entire amount of the gypsum slurry into a pressure-reduced buried flask containing one wax pattern,
A method for burying a wax pattern for producing a resin denture, comprising immersing the wax pattern in the gypsum slurry. 2. A gypsum slurry that mixes gypsum with water, and a gypsum weighing means for weighing gypsum required to prepare a gypsum slurry capable of burying one wax pattern for producing a resin denture. It is possible to inject the gypsum slurry under reduced pressure with water / gypsum mixing means equipped with an on-off valve for supplying the stirring means and the entire amount of the prepared gypsum slurry at one time to the buried flask below. A wax pattern burying apparatus, comprising: a burying flask for storing one wax pattern. 3. The buried flask has a dewaxing port for dewaxing after hardening of gypsum and a resin injection port, and
The wax pattern burying apparatus according to claim 2, wherein the dewaxing port and the resin injection port are buried flasks that are sealed with wax until the dewaxing step. 4. The on-off valve of the water / gypsum mixing means comprises a hollow valve body made of an elastic material and a gas supply line, and a gas such as air is press-fitted to expand the valve body. By closing the passage of the gypsum slurry by means of, by discharging the gas press-fitted to contract the valve body, it is an on-off valve configured to open the passage of the gypsum slurry. Item 2. The wax pattern burying device according to item 2.