JPH09221403A - Filler for root canal made of polyolefin - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a physically, chemically and biologically stable filler for a root canal, not stimulating and easy to handle by using a specified polymer resin. SOLUTION: This filler for a root canal is formed by using a polyolefin resin, especially a polypropylene resin. The polypropylene resin has a moderate hardness and flexural strength and a good moldability and is moldable to the form observing the international standard for the root canal. The isotactic polypropylene is preferable in the polypropylene resin. A silicone resin available in a paste-like form and curable in a short period in the root canal is preferably used as a sealant for filling a gap between the filler for the root canal and the wall thereof and confirming the adhesion of the filler to the wall of the root canal. Dimethyl polysiloxane as the silicone resin and an agent made from zinc eugenolate are preferably used as the sealant. The filler for the root canal 7 with the sealer 8 is inserted into the enlarged root canal after enlarging a dental pulp as shown in the cross-sectional drawing of the figure, cured in a short period and adhered to the wall of the root canal and fixed with the filler for the root canal.

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 for filling a root canal of a tooth after pulpectomy (extraction), which is particularly physicochemically stable and has little material deterioration and can be used in a living body for a long period of time. The present invention relates to a root canal filling material that can be placed and does not have a harmful effect on the apical periodontal tissue, and further relates to a root canal filling material including the root canal filling material and a sealer filling the periphery of the root canal wall.

[0002]

2. Description of the Related Art Dental caries is a bacterial infection in teeth, and bacteria in dental plaque first invade the enamel covering the surface of teeth and then dentin. When further caries progresses, bacterial infection spreads to the pulp, resulting in pulpitis. As a method for treating this pulpitis, the infected pulp is extracted and the root canal filling material is filled therein. This state will be described with reference to the drawings. In FIG. 3, the tooth surface is covered with enamel 1,
Below this enamel 1 is dentin 2. A pulp 3 is present at the center of the pulp, and an apical hole 4 is provided at the tip of the pulp 3 and is attached to the apical periodontal tissue 5. As a conventional treatment for pulpitis, the infected pulp is extracted and the needle-shaped reamer file 6 is inserted into the root canal of the hollowed tooth to expand the root canal to an appropriate size. The root canal filling material is filled therein with a sealer to close the apical foramen. By this treatment, the path of infection to the oral cavity, the root canal, and the apical periodontal tissue is blocked to cure the apex.

The following properties are required as conditions for the root canal filling material. (1) Being invariant. It is necessary that the apical tissue does not undergo changes in morphology or properties without contraction or decomposition. (2) Be non-irritating. It is not harmful to the periodontal tissues of the apex. (3) It is not porous. That is, it is necessary to be dense and not allow the invasion of tissue fluid or bacteria, toxins and the like. (4) Must be compatible. That is, it is necessary to easily fill the vicinity of the apical foramen and completely close the root canal and apical foramen. (5) It has adhesiveness. Completely adhere to the root canal wall,
It is necessary that water and bacteria do not enter the root canal. (6) Be able to sterilize. (7) Do not stain teeth (8) Can be removed as required (9) Be radiopaque (10) Have tissue affinity and heal bone scar at the apex What promotes. (11) Easy to handle

To summarize the above required characteristics, A)
Physically, chemically and biologically stable, non-irritating to living organisms, B) compact and non-porous, and C) capable of easily reaching and closing the apical foramen, D) Sterilization, E) Removable X-ray contrast, F) Easy handling.

By the way, there are sizing agents and solid materials for root canal filling, and solid materials are generally used in many cases. Gutta-percha points mainly made of rubber and zinc are used as the solid material. In addition, there are silver points. The silver point has the drawback that it is not very adherent to the apical foramen and is very difficult to remove, so it is rarely used at present. The gutta-percha point is widely used because it is impermeable to X-rays and can be formed into a certain shape. However, even at the gutta-percha point, the invariance is not perfect, and the product deteriorates and becomes brittle even under normal environment, and is phagocytosed as a foreign substance in the living body. Furthermore, it is porous at the microscopic level. Further, it is difficult to sterilize as a medical material.

[0006]

DISCLOSURE OF THE INVENTION The present inventors have completed the present invention as a result of various studies on a root canal filling material which is more stable than the conventionally used root canal filling material and has good workability. However, the object of the present invention is physicochemically stable, has no foreign matter, has appropriate hardness and elasticity for insertion into a curved root canal, and can be placed in a living body for a long period of time with little deterioration in material. Another object is to provide a root canal filling material that can be easily sterilized.

[0007]

The gist of the present invention is a root canal filling material made of a polyolefin resin. That is, a polyolefin resin, particularly a polypropylene resin, has appropriate hardness and bending strength, has good moldability, and can be molded into a shape that complies with international standards as a root canal filler, and isotactic propylene is particularly preferable. .

The preferred conditions for the root canal filling material are that it is physicochemically stable, has no foreign substance or toxicity to the living body, and at the same time has 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. From the above, the root canal filling material of the present invention substantially satisfies the preferable conditions of the root canal filling material described above, 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. Furthermore, in the present invention, as a sealer that fills the gap between the root canal filling material and the root canal wall and enhances the adhesion to the root canal wall, a paste-like silicone that hardens within the root canal in a short time was developed.

The polyolefin used in the present invention is polyethylene, polypropylene or a copolymer containing ethylene or propylene as a main component, and the preferred polyolefin is polypropylene, and polypropylene having an isotactic structure is particularly preferred. .

Polyolefin has physicochemically strong water repellent property, non-water absorbing property, heat stability, etc., and is stably encapsulated in connective tissue without being absorbed in the living body. From the above, polyolefins, particularly isotactic polypropylene, have 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.

When the root canal filling material according to the present invention is used, it is necessary to fill the gap between the root canal filling material and the root canal wall with a sealer and bring them into close contact. As the sealer, a silicone such as dimethylpolysiloxane or a zincated Yugenol preparation is used. A polymerization inhibitor is usually added to silicone, and a curing agent (c
Atalyst) is added and the root canal is filled as a sealer together with the root canal filling material, but the process from the initiation reaction to the termination reaction is followed to become a chemically stable insoluble and infusible silicone, and the root canal filling material is It fills the gaps in the root canal wall and enhances the root canal sealability. In addition, the zincated Yugenol preparation has been conventionally used as a sealer for a gutta-percha root canal filling material.

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. Further, it is preferable that the tip end thereof 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. FIG. 1 is a cross-sectional view of a root canal filling material, which is extracted from
The root canal filling material 7 is inserted together with the sealer 8 into the enlarged root canal. FIG. 2 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 the 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.

[0014]

EXAMPLES AND COMPARATIVE EXAMPLES Next, the present invention will be specifically described with reference to actual examples. Example 1 Results of inserting a polypropylene root canal filling material having the same thickness and having an internationally standardized shape into a root canal of a tooth that had been demyelinated and had a root canal expanded with a thickness of 0.5 mm, together with a sealer. ,
A close packing was obtained by the feel of the operator during insertion. Furthermore,
The tight packing was proved by the observation of the contrast agent contained in the sealer even in the X-ray photography.

[0015]

As described above, since the root canal filling material of the present invention is made of polyolefin, it has no harmful effect and exhibits the following effects as compared with the conventional root canal filling materials. 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 is far less foreign in vivo and 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. It is necessary to take out the root canal filling material in the case of retreatment of teeth, but the root canal filling material of the present study is difficult to tear and can be easily taken out because it does not adhere to tissues in the living body. 6. Easy to sterilize.

[Brief description of drawings]

FIG. 1 is an explanatory view of filling a root canal filling material and a sealer of the present invention.

[Fig. 2] Root canal filling material made of polyolefin resin created according to International Standard No. 50

FIG. 3 is an explanatory view of enlarging a root canal for treating pulpitis.

[Explanation of symbols]

1 Enamel 2 Dentin 3 Root canal (dental pulp) 4 Root canal hole 5 Apical periodontal tissue 6 Needle-like reamer 7 Root canal filling material 8 Sealer

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Yasuo Yamazaki 1-6-47 1-6-47 Kunitachi, Tokyo (72) Inventor Kazuo Shiiki 201, 1-20, Mikitacho, Iwaki city, Fukushima prefecture

Claims (2)

[Claims] 1. A root canal filling material comprising a polyolefin resin. 2. A root canal filling material, wherein a sealer filling a gap between the root canal filling material and the root canal wall is a silicone resin.