JPS6311329B2 - - Google Patents

Description

[Detailed description of the invention]

"Industrial Application Field" The present invention relates to a tooth positioner used in orthodontic treatment. ``Prior art'' A tooth positioner is a device for correcting malalignment and occlusion of the upper and lower dentition. Specifically, the tooth positioner is a device for correcting the malalignment and occlusion of the upper and lower dentition. The tooth positioner is configured as a U-shaped molded body with the impression of It is a form of plastic surgery. Conventionally, natural rubber, synthetic rubber, silicone rubber, polyurethane rubber, etc. have been used as molding materials for this tooth positioner. In addition, the tooth positioner temporarily disassembles the tooth row model obtained from the actual impression of the patient's tooth row, transfers the model original form in which the disassembled model is rearranged into an ideal tooth row onto a mold, and then transfers the model original form into a mold. By filling the above-mentioned molding material into the tube, the tube is individually manufactured according to the treatment purpose of each patient. "Problems to be Solved by the Invention" Among the above molding materials, tooth positioners made of natural rubber, which are relatively frequently used, deteriorate significantly after long-term use, resulting in a decrease in mechanical properties or large deformation. Therefore, in recent years, polyurethane rubber and silicone rubber, which are tasteless and odorless and have excellent elasticity, have been attracting attention. However, in the case of polyurethane rubber, methacrylate resin is used as the mold material instead of the plaster mold used in normal dental technology, and
Since molding is performed under pressure of 5 kg/cm ² at °C, the molding process is not only complicated, but also requires large-scale equipment, so it is not compatible with normal dental technology operations and has not yet become widespread. Furthermore, as silicone rubber, it has been known to use heat-vulcanized silicone rubber, but this silicone rubber undergoes primary vulcanization (150°C) and secondary vulcanization (200 to 250°C) at high temperatures. There must be. As a result, it becomes difficult to use gypsum, which is easy to manipulate, as a mold material, and even in the case of silicone rubber, special mold materials and equipment are required, making the molding method complicated. Furthermore, since this type of silicone rubber is vulcanized with an organic peroxide, it not only generates by-products during the vulcanization process, but also has the problem of shrinkage. In any case, tooth positioners are manufactured individually under the supervision of an orthodontist according to the irregularity of the patient's dentition, so plaster molds, which are widely used in the field of dental technology, cannot be used. is considered to be the biggest problem in molding. For this reason, there is currently a desire for a tooth positioner that uses a material with excellent elasticity to replace the conventional molding material and does not generate reaction by-products. "Means for Solving the Problems" Therefore, the present invention was developed to effectively solve the above-mentioned conventional problems. A low-temperature vulcanizable vinyl silicone resin composition having thixotropic properties prepared by kneading the base resin of polydimethylvinylsiloxane represented by the formula and a curing agent is cured by addition polymerization by keeping it at a temperature higher than room temperature and below 150°C. The purpose of the present invention is to provide a tooth positioner made of the following. In the present invention, instead of the conventional molding material mentioned above, A low-temperature flow-type vinyl silicone resin composition (hereinafter referred to as vinyl silicone resin) having thixotropic properties is used, which is obtained by kneading a main resin consisting of polydimethylvinylsiloxane shown in (1) with a curing agent, particularly polymethylhydrogensiloxane. Here, as a typical example of polymethylhydrogensiloxane, the structural formula is It is a polymethylhydrogensiloxane represented by
In addition, conventionally known addition polymerization catalysts can be used. This vinyl silicone resin is usually stored separately into a base resin made of the above-mentioned polydimethylvinylsiloxane and a curing agent made of polymethylhydrogen siloxane, and when used, they are mixed at a ratio of approximately 10 parts of the base resin and 1 part of the curing agent. It is something. Furthermore, the vinyl silicone resin used in the present invention is
It has thixotropic properties that mechanically easily fluidizes during kneading before heating and polymerization, and does not flow after standing and maintains a stable shape after kneading, so it can be poured into plaster molds using pressure with a syringe, etc. Since it can be poured and there is no natural flow after injection, it is extremely easy to fill a plaster mold. Furthermore, the burrs at the joints of the plaster molds are extremely thin, and the thickness of the burrs can be adjusted to about several tens of micrometers, so that the effect on height changes due to molding is hardly a problem. Incidentally, after cutting off the burr with scissors, the part may be corrected with sandpaper or the like. Furthermore, since the vinyl silicone resin is cured by addition polymerization, there is little shrinkage and no reaction by-products are generated. Furthermore, the polymerization temperature is relatively low, allowing the use of gypsum as a mold material. Therefore, the vulcanization temperature is not as high as that of heat-curable silicone (primary vulcanization 150°C, secondary vulcanization 250°C),
On the other hand, this vinyl silicone resin is referred to as a low temperature vulcanization type because it is vulcanized at a temperature higher than the vulcanization temperature (room temperature) of a room temperature vulcanization type silicone. Therefore, when molding a tooth positioner using a vinyl silicone resin having such characteristics, it is necessary to disassemble a dentition model obtained from an actual impression of a patient's dentition, and use the disassembled model to create an ideal tooth positioner. Produce a model prototype rearranged in rows, transfer the model prototype to a plaster mold often used in dental technology, and fill the plaster mold with the above-mentioned vinyl silicone resin kneaded material through a syringe or spatula. After that, the plaster mold was closed and the flask containing the mold was placed in boiling water.
When heated and polymerized at about 100°C for 60 to 90 minutes under a conventional addition polymerization catalyst, it hardens into a rubber-like resin. After heating and polymerization, the flask is removed from the hot water, left to cool at room temperature or quenched in water, and removed from the plaster mold to easily obtain a molded product of the two-positioner, which is a tasteless and odorless rubber-like elastic material. In addition, it is easy to release the mold from the plaster mold, and the plaster mold is not damaged when taken out, so two molds can be used in the same mold.
This method has a significant advantage over conventional methods in that it is also possible to mold the tooth positioner described above. In another embodiment, when kneading the vinyl silicone resin, if a filler such as diatomaceous earth powder is appropriately mixed in, the desired elasticity and hardness can be obtained after heating and polymerizing the resin according to the patient's orthodontic treatment. be able to. The table below shows a comparison of elasticity and hardness between vinyl silicone and an example in which a filler is mixed therein.

[Table] The molded tooth positioner itself is tasteless and odorless, causes no redness or swelling of the oral mucosa during use, and due to the elasticity of the vinyl silicone resin, there is extremely little discomfort when worn. Also, due to its elasticity, it has many advantages such as an excellent effect on orthodontic alignment. "Effects of the Invention" As described above, the present invention provides a low-temperature vulcanizable vinyl silicone resin composition having thixotropic properties, which is obtained by kneading a main ingredient made of polydimethylvinylsiloxane and a curing agent, at a temperature higher than room temperature and at 150°C. Because it is characterized by being cured by addition polymerization by keeping it at a temperature that is below 100 degrees, it is possible to mold the tooth positioner using a plaster mold in the same way as the normal denture manufacturing process, and it is possible to mold the tooth positioner using a plaster mold. This eliminates the need for special mold materials and equipment, making it possible to mold the tooth positioner extremely easily using dental technology. Therefore, it can greatly contribute to orthodontic treatment that accompanies the use of tooth positioners.

Claims (1)

[Claims] 1 A low-temperature vulcanizable vinyl silicone resin composition having thixotropic properties prepared by kneading the base resin of polydimethylvinylsiloxane represented by the formula and a curing agent is cured by addition polymerization by keeping it at a temperature higher than room temperature and below 150°C. A tooth positioner that makes it easy. 2. The tooth positioner according to claim 1, which is cured by addition polymerization by being kept in hot water at about 100°C. 3. The two positioner according to claim 1, wherein the curing agent is polymethylhydrogensiloxane. 4. The tooth positioner according to claim 3, which comprises a base material and a curing agent mixed in a ratio of approximately 10:1. 5. The tooth positioner according to claim 1, which is formed by kneading a filler such as diatomaceous earth.