JPS581426B2 - Method for preparing working models and equipment used therein - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for easily preparing a precise working model by easily separating an abutment crown from a tooth impression of the working model, and an instrument used therefor.

More specifically, the present invention facilitates preparation of a precise working model by embedding a hollow tube within the dental mold of the working model and easily separating the abutment crown from the dental mold of the working model. The present invention relates to a method for doing so and an apparatus used therefor.

Conventionally, working models used in dental technical work have been prepared in several types depending on the purpose of the work.

For example, a crown that emphasizes the accuracy and positional relationship of tooth impressions
These include models for making bridges and complete dentures for the purpose of accurately reproducing mucous membranes.

However, recently, as prosthetics that require advanced manufacturing techniques, such as telescopic dentures and attachment dentures, have become popular, working models must also be highly accurate to accommodate precise work.

In particular, the working model used as the main model in the final process of these works (generally called the final working model)
The essential conditions are that the tooth impression is accurate, the positional relationship is accurately restored, and the mucous membrane is precisely reproduced.

Conventionally, the final working model that has been widely adopted is generally prepared by the following steps.

First, after fitting the abutment crown in the oral cavity and connecting and fixing it with temporary adhesive material such as instant polymerization resin to prevent movement of the position,
Perform a full jaw impression with plaster or other impression material.

Next, after returning the abutment crown to the impression, insert the jaw mold used for waxing or a metal or resin tooth mold made to match the inner surface of the abutment crown, and then inject plaster to complete the model. do.

However, in the unlikely event that there is even a slight mismatch between the abutment crown and the tooth mold, the abutment crown will rotate or float, which will hinder the precision of subsequent work, so this method is not recommended. The tooth profile used requires high precision.

In addition, the tooth profile must be made of a material with sufficient strength to withstand the fairly high pressures during operation and avoid any risk of wear or breakage.

However, even if the tooth mold is made to precisely fit the abutment crown, there is a risk that it may shift during plaster injection, and the greater the number of abutment teeth, the greater the risk of positional errors in the tooth mold. is unavoidable.

Another conventional preparation method is to directly inject low-fusion metal, resin, or plaster into the abutment crown instead of inserting a tooth mold.

With this method, it is possible to eliminate the error in fitting accuracy between the abutment crown and tooth mold mentioned earlier, but 1) the abutment crown is thin and long for lower anterior teeth and upper lateral incisors; In some cases, it is difficult to inject the tooth mold material into the fine details, and as a result, the abutment crown may easily separate from the tooth mold.

Especially when using low-fusion alloys! In some cases, temperature control is difficult,
Low temperatures create insufficient flow conditions.

2) After injecting the tooth mold material, it is not easy to separate the abutment crown from the tooth mold, and there is a high risk of damaging the crown edge, and the work is even more difficult when the abutment crown is connected. Become.

3) If dental mold material is injected after treatment to protect the crown edge of the abutment crown, the gingival area is often not restored and the model is no longer qualified as a final working model.

4) Since there are problems such as distortion due to the characteristics of the material when using a large amount of tooth mold materials such as low alloy alloys and resins, none of the methods described above for preparing the final work model can be said to be the optimal method. Ta.

The present inventor realized that separation can be easily performed by embedding a hollow tube in the tooth mold of the final working model to create a guide hole for separating the tooth mold from the abutment crown, and achieved the present invention. reached.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a novel method for preparing a working model and an instrument for use therein, which can eliminate the drawbacks of the prior art.

The present invention positions a tooth-shaped tube made of an elongated hollow tube with the help of a tube holding pin inserted into the tube, and a planting pin attached to the tube and the holding pin, and uses tooth-shaped material, plaster, etc. The tube is fixed in the abutment crown, and the abutment crown is separated from the tooth mold by inserting a metal needle into the tube from which the retaining pin, planting pin, impression material, etc. have been removed and tapping lightly. This is a method for preparing a working model characterized by comprising steps.

Furthermore, the present invention provides a tooth-shaped tube made of an elongated hollow tube, a tube holding pin inserted into the tube, an erecting pin attached to at least the tip of the holding pin and the tube, and a stud pin inserted into the tube. This is an instrument used for preparing a working model, characterized in that it is made of a metal needle that can be used to create a working model.

Next, the present invention will be explained in detail with reference to the drawings.

In the drawings, the present invention mainly includes a tooth mold tube 1 that is embedded in a tooth mold and serves as a guide hole for removing the abutment crown, a tube holding pin 2 that holds the tooth mold tube 1 during the implantation operation, and a tube holding pin. Combined with 2, tooth-shaped tube 1
It is comprised of a planting pin 3 for planting on the inner surface of the abutment crown, and a second planting pin 4 for assisting in planting.

The toothed tube 1 is made of a metal tube or a plastic tube, and is provided with projections and depressions a and b at two locations to bond with the model material and help fix the toothed tube 1 to the material.

The upper unevenness a is used for bonding with plaster 101, and the lower unevenness b is used for bonding with a tooth profile material 102 such as resin.

The main body of the tube holding pin 2 is made of a metal rod that fits the tube of the tooth mold tube 1, and the lower tip has a conical shape.

This main body is bent at a right angle at the upper part, and has a short connecting pipe C to which a planting pin 3 is attached and connected, and to enable sliding from side to side.

It also has a loop d1 for stabilizing the position of the second planting pin 4 and a stopper e for stabilizing the vertical position of the toothed tube 1.

The planting pin 3 is made of a metal needle bent at a substantially right angle, and in particular, the tip has a thin needle-like shape in order to fix the position of the tube holding pin 2 by planting it on the impression material 103.

The second planting pin 4 is made of a metal needle like the planting pin 3, and has a needle-like tip in order to fix the tube holding pin 2 by planting it on the impression material 103, and further has a stopper f. ing.

Next, the present invention will be explained in more detail with reference to examples, and its effects will also be described.

Example 1 First, the tube holding pin 2 and the planting pin 3 are assembled by inserting the planting pin 3 into the connecting pipe C of the tube holding pin 2.

Next, with the tube holding pin 2 inserted into the impression tube 1, place the implantation pin 3 into the impression so that the impression tube 1 is located at the center of the inner surface of the abutment crown 104 held within the impression. It is planted on wood 103.

After that, after determining the final position and direction of the toothed tube 1, the second planting pin 4 is inserted into the loop d of the tube holding pin 2.
, the second planting pin 4 is planted in the impression material 104, the stopper f is brought into contact with the loop d, and the tooth mold tube 1 is fixed in position.

Further, the tip of the tube holding pin 2 is brought into contact with the center of the inner surface of the abutment crown 104, and the toothed tube 1 is adjusted to be slightly floating above the inner surface of the abutment crown 104, and then attached to the tube holding pin 2. Fix it with the stopper e.

Next, a tooth mold material 102 such as resin is injected into the abutment crown 104 using a syringe or the like, and after the tooth mold material 102 has hardened,
Tube holding pin 2, planting pin 3, and second planting pin 4
Then, remove the odor from the impression material 103 and the impression tube 1. Then, inject plaster 101 so as not to close the holes in the impression tube 1, and when the plaster 101 hardens, remove the impression tray 105 and the impression material 103. Insert the metal needle 5 for removal into the hole of the tooth-shaped tube 1 protruding from the plaster 101 and tap it lightly to release the abutment crown 1.
04 is easily separated from the tooth mold 102, and the final working model is completed.

In the embodiment, the dental impression tube 1 was positioned by attaching the planting pins 3 and 4 to the tube holding pin 2 and then fixed to the abutment crown.
The present invention is not limited to the above-mentioned embodiments, since it can be attached by any suitable attachment means.

This is illustrated in the examples below. Example 2 First, the tube holding pin 2 and the planting pin 3 are assembled by inserting the planting pin 3 into the connecting pipe C of the tube holding pin 2.

Next, with the tube holding pin 2 inserted into the impression tube 1, place the implantation pin 3 into the impression so that the impression tube 1 is located at the center of the inner surface of the abutment crown 104 held within the impression. It is planted on wood 103.

After that, after determining the final position and direction of the tooth pattern tube 1, the second planting pin 4 is passed through the loop d of the tooth pattern tube 1, and the second planting pin 4 is planted in the impression material 104, The stopper f is brought into contact with the loop d, and the tooth pattern tube 1 is fixed in position.

Further, the tip of the tube holding pin 2 is brought into contact with the center of the inner surface of the abutment crown 104, and the toothed tube 1 is adjusted to be slightly floating above the inner surface of the abutment crown 104, and then attached to the tube holding pin 2. Fix it with the stopper e.

Next, a tooth mold material 102 such as resin is injected into the abutment crown 104 using a syringe or the like, and after the tooth mold material 102 has hardened,
Tube holding pin 2, planting pin 3, and second planting pin 4
is removed from the impression material 103 and the tooth mold tube 1.

After that, plaster 101 is injected so as not to close the holes of the dental mold tube 1, and once the plaster 101 has hardened, the impression tray 105 and the impression material 103 are removed. Insert the metal needle 5 for removal into the hole and tap it lightly to release the abutment crown 10.
4 is easily separated from the tooth mold 102, and the final working model is completed.

Example 3 With the tube holding pin 2 inserted into the tooth impression tube 1, the implant pin 3 and the second 2 Pass the planting pin 4 through the loops d and d of the toothed tube 1,
Plant on the impression material.

Next, the stoppers f, f of the planting pin are brought into contact with the loops d, d, and the tooth mold tube 1 is fixed in position.

Further, the tip of the tube holding pin 2 is brought into contact with the center of the inner surface of the abutment crown 104, and the toothed tube 1 is adjusted to be slightly floating above the inner surface of the abutment crown 104, and then attached to the tube holding pin 2. Fix it with the stopper e.

Next, a tooth mold material 102 such as resin is injected into the abutment crown 104 using a syringe or the like, and after the tooth mold material 102 has hardened,
Tube holding pin 2, planting pin 3, and second planting pin 4
After that, gypsum 101 is injected so as not to close the holes of the dental impression tube 1, and once the plaster 101 has hardened, the impression tray 105 and the impression material 103 are removed.

Next, the metal needle 5 for removal is inserted into the hole of the tooth mold tube 1 protruding from the plaster 101, and when tapped lightly, the abutment crown 10
4 is easily separated from the tooth mold 102, and the final working model is completed.

The final working model prepared using the present invention has the following advantages over conventional methods:

1. The abutment crown 104 is stable because a precise tooth mold 102 can be made in close contact with the inner surface of the abutment crown 104.

2. No positional error of the abutment crown 104 occurs.

3. The abutment crown 104 can be easily removed from the tooth mold 102 without damaging the crown edge.

4. The morphology of the gingival region is also properly restored.

5. A tooth profile material 102 such as resin with sufficient strength can be used.

6. Since only a small amount of the tooth profile material 102 is needed, it does not correct distortion caused by the characteristics of the material.

7. It is easy to operate and anyone can do it.

With these characteristics, it can be said that this method eliminates the drawbacks of the conventional preparation method for final working models and can ensure even higher accuracy.

[Brief explanation of the drawing]

Fig. 1 is an exploded perspective view of one example of the instrument of the present invention;
Figure a is a perspective view of another example of the instrument of the present invention in an assembled state, Figure 2b is a perspective view of the same exploded view, and Figure 3a is yet another example of the instrument of the present invention in an assembled state. Example perspective view, Figure 3b is an exploded perspective view, and Figure 4 is the same
A perspective view showing the state in which the device shown in the figure is assembled and operated;
FIG. 5 is a conceptual cross-sectional view showing the state during operation. 1... tooth shaped tube, 2... tube holding pin, 3...
Planting pin, 4... Second planting pin, 5... Metal needle for detachment,
101...Gypsum, 102...Tooth mold material, 103...Impression material, 104...Abutment crown, 105...Impression tray, a...
...Irregularities for bonding with plaster, b...Irregularities for bonding with tooth profile material, c... Connecting pipe, d... Loop, e... Stopper for holding pin, f... Stopper for planting pin.

Claims (1)

[Claims] 1. Positioning of a tooth-shaped tube consisting of an elongated hollow tube with the help of a tube holding pin inserted into the tube, and a planting pin attached to at least either the tube or the holding pin. Then, fix the tube in the abutment crown with tooth mold material, plaster, etc., and insert a metal needle into the tube from which the retaining pin, planting pin, impression material, etc. have been removed, and tap it lightly. A method for adjusting a working model, comprising the step of separating a crown from a tooth mold. 2. A tooth-shaped tube made of an elongated hollow tube, a tube holding pin inserted into the tube, a planting pin attached to at least either the holding pin or the tube, and a metal that can be inserted into the tube. An instrument used for adjusting a working model, characterized by consisting of a needle. 3. A tooth-shaped tube consisting of an elongated hollow tube with irregularities on its surface, a connecting pipe inserted into the tube at the bent part, a hook-shaped tube holding pin having a loop at the end of the bent part, and a stopper near the bent part, A first hook-shaped planting pin whose end portion can be inserted into the connecting pipe and attached to the holding pin, a rod-shaped second planting pin that can be inserted into the loop and attached to the holding pin, and a second planting pin that is inserted into the pipe. 3. The device according to claim 2, characterized in that it is made of a rod-shaped metal needle that can be used as a needle.