JPH09301816A - Root canal filling agent comprising polypropylene resin - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a root canal filling agent, physically and chemically stable, free from deterioration and foreign property as a material in a living body, excellent in handleability, sterilizable and capable of existing for a long time in a living body. SOLUTION: This root canal filling agent comprises a contrast medium-free propylene resin. Another type of the root canal filling agent comprises a propylene resin for a root canal filling agent consisting of that root canal filling agent and a contrast mediumadded silicone sealer.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a root canal filling material to be filled in a root canal of a tooth after pulpectomy (extraction), and is particularly physicochemically stable and stable in material. The present invention relates to a root canal filling material which can be placed for a long period of time and at the same time has no harmful effect on apical periodontal tissue.

[0002]

BACKGROUND OF THE INVENTION Pulpitis is caused by the progress of dental caries.
The cure for this pulpitis is to extract the infected pulp,
It is to fill the root canal filling material here. This state will be described with reference to FIG. The tooth consists of enamel 1, dentin 2, cementum 3 and root canal containing pulp. The apical hole 4 is located at the tip of the root canal and is continuous with the apical periodontal tissue 5. Next, a conventional treatment method for pulpitis will be described with reference to FIGS. First, the operator extracts the infected dental pulp in the root canal and enlarges the root canal to an appropriate size by the needle-shaped file 6. The surgeon fills the enlarged root canal with the root canal filling material 7,
The apex 5 is closed. At that time, the gap created between the root canal filling material and the root canal wall is filled with a substance called a sealer 8 (cement for filling the root canal). By the above treatment, the infection route from the oral cavity to the apical periodontal tissue 5 through the root canal is blocked.
At the same time, the interstitial fluid of the apical periodontal tissue 5 can be prevented from entering the root canal.

The following properties are required as conditions for the root canal filling material. (1) It can be easily inserted into the root canal. (2) The root canal wall and the root apex can be closely sealed. (3) Does not shrink after root canal filling. (4) Do not allow saliva or tissue fluid (water) to enter. (5) It is bacteriostatic. At least it does not grow bacteria. (6) It has an X-ray contrast property. (7) Does not stain tooth substance (8) Does not stimulate apical periodontal tissue. (9) Disinfection is easy and quick. (10) It can be removed if necessary.

Summarizing the above required characteristics,
(A) Complete closure of root canal and apical foramen (B) No irritation (C) Physically and chemically stable (D) X-ray contrast (E) Removable. In addition to these, the following characteristics are considered necessary for the root canal filling material as a living implant. (11) Complete sterilization is possible. (12) Nontoxic and low antigenicity.

By the way, conventional root canal filling materials include sizing agents and solid materials. Generally, solid materials are often used. Gutta-percha points mainly made of rubber and zinc are widely used as solid materials. A silver solid agent was also developed,
Since it does not adhere to the apical foramen and is very difficult to remove, it is currently rarely used. The gutta-percha point is widely used in dentistry because it is a thermoplastic material and thus can well seal the root canal and the apical foramen. However, the gutta-percha point root canal filling material is not completely invariant, and the product deteriorates and becomes brittle even in a normal environment, and is phagocytosed as a foreign substance in the living body. Furthermore, it is porous at the microscopic level.
It is also difficult to sterilize as a medical material. Also, 1960
There were reports of attempts to develop root canal filling materials using synthetic resins such as polypropylene and silicone in the 1980s. These root canal filling materials made of synthetic resin do not have radiographic contrast by themselves, so that it is necessary to provide the root canal filling materials made of these synthetic resins with appropriate contrast. Therefore, a contrast agent has to be added to the root canal filling material. In the above report, it is stated that the addition of an X-ray contrast agent to the polypropylene root canal filler causes material deterioration and cannot be commercialized.Silicone resin is not a solid material but is hardened in the root canal and adheres to the root canal. Conclude that it is inappropriate from not doing,
To date, no root canal filling material made of synthetic resin has been developed.

[0006]

DISCLOSURE OF THE INVENTION The present inventor has made various attempts to put into practical use a root canal filling material made of a synthetic resin which is more stable than the conventionally used root canal filling material and has good workability. As a result of the examination, the present invention has been completed, and the purpose of the present invention is to be physicochemically stable, have no foreign matter, have appropriate hardness and elasticity for insertion into a curved root canal, and have no material deterioration. It is an object of the present invention to provide a root canal filling material which can be left in the living body for a long time in a small amount and can be easily sterilized.

[0007]

The gist of the present invention is a root canal filling material characterized by comprising a polypropylene resin containing no contrast agent, and the root canal filling material and a silicone sealer containing a contrast agent. It is a root canal filling material characterized by comprising.

That is, the present invention is a root canal filling material made of polypropylene resin. That is, for example, an isotactic polypropylene resin has an appropriate hardness and bending strength, has good moldability, and can be molded into a shape that meets the international standard as a root canal filler, so that it is an optimum root canal filler. Can be formed. However, isotactic propylene resin does not have X-ray contrast property, and
When an X-ray contrast agent is added to give an appropriate X-ray contrast concentration as a root canal filling material, as described above,
The physical properties of the resin change and become brittle.

Therefore, in the present invention, the X-ray contrast agent is not added to the polypropylene root canal filling material, but the X-ray contrast agent is added to the sealer filling the gap between the root canal filling material and the root canal wall. By adding an X-ray contrast agent to the sealer, the filling state of the root canal filling material in the root canal can be sufficiently known, and pulpitis and apical inflammation can be completely treated. As the X-ray contrast agent that can be added to the sealer, the barium contrast agent that is usually used is most preferable, and the addition amount is 0.2 per 2.5 g of the sealer.
It is about 0.8 g.

Further, the present invention will be described in detail. The preferred conditions for the root canal filling material are that they are physicochemically stable, have no foreign substance or toxicity to the living body, and at the same time have appropriate hardness and elasticity for insertion into the root canal. Furthermore, the inserted root canal filling material is required to have high adhesion to the root canal wall. In addition, X-ray contrast property is required. From the above perspective,
The polypropylene root canal filling material of the present invention substantially satisfies the preferable conditions of these root canal filling materials, is physicochemically stable, has no foreign substance or toxicity to the living body, and can be inserted into a curved root canal. It has such appropriate hardness and elasticity.

Further, in the present invention, as a sealer for filling the gap between the root canal filling material and the root canal wall and enhancing the adhesion to the root canal wall, a paste-like silicone which is hardened within the root canal in a short time is used. Of. The polypropylene root canal filling material does not have an X-ray contrast property, but this point was solved by making the sealer have an X-ray contrast property as described above. That is, the presence of the polypropylene root canal filling material in the root canal and the state of root canal filling are confirmed as a shadow image surrounded by a sealer showing radiopaque properties. The sealer of conventionally used zincated Yugenol preparations also has high radiographic properties. The polypropylene resin used in the present invention is a polypropylene homopolymer or a copolymer containing propylene as a main component and a monomer copolymerizable therewith, for example, ethylene, and the like. Preferred polypropylene is a polypropylene having an isotactic structure. Is.

[0012] Polypropylene has physicochemically strong water repellent property, non-water-absorbing property, heat stability and the like, and is stably encapsulated in connective tissue without being absorbed in the living body. From the above, polypropylene, especially isotactic polypropylene, has important physical properties such as high flexural modulus, improved rigidity impact balance, and low linear expansion coefficient. Further, it can be combined with an X-ray contrast medium.
Furthermore, polypropylene has chemical resistance, heat resistance during sterilization,
It is suitable as a medical material due to its characteristics such as radiation sterilization resistance. In addition, since the molding is easy, a root canal filling material having a shape conforming to the international standard can be easily prepared. Therefore, polypropylene can be said to be a root canal filler made of a safe and stable polymer compound. Moreover, since the filler of the present invention can have a shape conforming to the international standard, it can be tightly filled when filled.

[0013] Polypropylene and silicone have strong physicochemical properties such as drainage property, non-absorbability, and thermal stability, and are stably encapsulated in connective tissue without being absorbed in the living body. From the above, isotactic polypropylene has important physical properties such as high flexural modulus, improved rigidity and impact balance, and low linear expansion coefficient. Furthermore, polypropylene is suitable as a medical material because of its characteristics such as chemical resistance, heat resistance during sterilization, and radiation sterilization resistance. Further, since the molding is easy, a person having a shape conforming to the international standard of the root canal filling material can easily make it. Since the polypropylene root canal filler does not contain a contrast agent, the above-mentioned physical properties are maintained, and in the X-ray image when the root canal is filled, it is recognized as an X-ray shadow image surrounded by a sealer having an X-ray contrast property. Therefore, polypropylene can be said to be a root canal filler made of a safe and stable polymer compound. Moreover, since the filler of the present invention can have a shape conforming to the international standard, the filler can be tightly packed when filled. FIG. 4 shows a filler having a shape conforming to the international standard of the present invention.

When the root canal filling material according to the present invention is used, it is necessary to fill a sealer in the gap between the root canal filling material and the root canal wall and bring them into close contact. As the sealer, a silicone composed of dimethylpolysiloxane or a zincated Yugenol preparation is used. A polymerization inhibitor is usually added to silicone, and it is a curing agent when filling the root canal.
(catalyst) is added and the root canal is filled as a sealer together with the root canal filling material, but after the start reaction to the termination reaction, it becomes a chemically stable insoluble and infusible silicone, and the root canal filling material. To fill the gaps in the root canal wall and enhance the root canal sealing performance. This sealer made of silicon has an X-ray contrast property. Further, a zincated Yugenol preparation has been conventionally used as a sealer for a gutta-percha root canal filling material, which also has an X-ray contrast property.

The root canal filling material according to the present invention has the same shape as that of the conventional solid root canal filling material. That is, about 0.3
Having a diameter of ~ 1.4 mm and a length of about 28 mm,
Various selections are made depending on the applied root canal. Then, it is preferable that the tip portion is sharpened at an angle of about 75 degrees so that the apical hole can be easily closed. This root canal filling material has the properties required as the root canal filling material described above, and in particular, it is surely and easily inserted into the root canal, and the adhesiveness of the root canal wall of the root apex is enhanced. is there.

A root canal filling material according to the present invention will be described with reference to the drawings. 2 and 3 are cross-sectional views for explaining a state in which the polypropylene root canal filling material is filled. FIG. 2 shows a state in which the root canal is filled with the root canal filling material and the root canal is enlarged by the file 6, and FIG. 3 shows a state in which the root canal filling material 7 is inserted together with the sealer 8 into the enlarged root canal. . FIG. 4 shows the shape of the root canal filling material, which has the same standard shape as the root canal expander and reamer having a standardized thickness and shape. Since the reamer having the same standard shape is used, the root canal is filled almost in close contact with the root canal wall. A slight gap between the root canal filling material and the root canal wall is filled with a sealer 8. The sealer hardens in a short time, adheres to the root canal wall and is fixed together with the root canal filling material. In the radiograph, as shown in Fig. 1, the presence of the polypropylene root canal filling material and the state of root canal filling were confirmed as a radiographic image surrounded by a sealer having radiographic contrast in the root canal. To be done.

Next, the present invention will be specifically described with reference to examples. Example 1 A polypropylene root canal filling material having the same thickness and having an international standard shape was inserted together with a sealer into the root canal of a tooth that had been demyelinated and had a root canal expanded with a thickness of 0.5 mm. Silicone made of dimethylpolysiloxane was used as a sealer, and a barium contrast agent was added to the silicone to take a radiograph. A close packing was obtained by the feel of the operator during insertion. Furthermore, as a result of radiographs, the presence and filling state of the polypropylene root canal filling material in the root canal were recognized as a radiographic image surrounded by a sealer showing radiopaque properties. This state is shown as FIG.

[0018]

As described above, since the root canal filling material of the present invention is made of polypropylene, particularly isotactic polypropylene, it has no harmful effect and has the following characteristics as compared with the conventional root canal filling materials. It produces such an effect. 1. It has good adhesion to the root canal wall and almost complete root canal sealing. 2. It is a root canal filling material that is much more stable chemically, physically and physically. 3. It is a root canal filling material that has much less antigenicity in vivo and is less susceptible to phagocytosis. 4. It has elasticity and it is easy to fill even a root canal that is hard to break and bent. 5. Easy to sterilize. 6. Since the polypropylene root canal filler does not have an X-ray contrast property, the physical properties do not deteriorate. The absence of radiographic contrast was solved by adding radiographic contrast to the sealer. The presence of the polypropylene root canal filling material is confirmed as a shadow image surrounded by a sealer in the root canal. 7. It is necessary to take out the root canal filling material at the time of retreatment of the tooth, but the root canal filling material of the present invention is not easily torn off, and further, it does not adhere to the tissue in the living body and can be taken out easily.

[Brief description of drawings]

FIG. 1 is an X-ray photograph of a root canal filling material of the present invention and a sealer.

FIG. 2 is an explanatory view of enlarging a root canal for treating pulpitis.

FIG. 3 is an explanatory view of filling the root canal filling material and the sealer in the enlarged root canal

[Fig. 4] Root canal filling material made of polypropylene resin made according to International Standard No. 50

[Explanation of symbols]

1 Enamel 2 Dentin 3 Cementum 4 Apical hole 5 Apical periodontal tissue 6 File 7 Root canal filling material 8 Sealer

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yasuo Yamazaki 1-6-47 1-6-47 Kunitachi, Tokyo (72) Inventor Kazuo Shiiki 201, 1 in Mihama-cho, Iwaki city, Fukushima prefecture

Claims (2)

[Claims] 1. A root canal filling material comprising a polypropylene resin containing no contrast agent. 2. A root canal filling material comprising the root canal filling material according to claim 1 and a silicone sealer containing a contrast agent.