JPH10309286A - Dental therapy tool for root canal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress breeding of bacteria adhered to a therapy tool for root canal to make bacteria hard to be adhere and live, by making deg.C an almost cylindrical resin handle part by heat resistant resin containing a specific amount of antibacterial agent. SOLUTION: This tool 1 is constituted of a rod- or needle-like metallic cutting part 1a equipped with an edge to cut dentine, such as a reamer or a file, and an almost cylindrical resin handle part 1b. The resin handle part 1b is made of heat resistant resin containing 0.2-5 wt.% of an antibacterial agent. As the heat resistant resin used for the almost cylindrical resin handle part 1b, heat resistant resin with the glass transition temperature higher than 130 deg.C and the heat deforming temperature higher than 110 deg.C is preferably used so as not to be deformed by heat sterilizing. Polycarbonate resin, etc., is named as a concrete example. As an antibacterial agent to be contained in the heat resistant resin, there is a silver ion, etc., as an inorganic antibacterial agent and phenolether derivatives, sulfone derivatives as an organic antibacterial agent. They can be used solely and in combination of two or more kinds.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dental root canal treatment device which is effective in preventing infection from bacteria such as reamers and files used in dental treatment.

[0002]

2. Description of the Related Art In general, in the treatment of dental caries in which caries have spread to the dental pulp, a root canal treatment in which the root canal is enlarged and disinfected after removal of the dental pulp to fill the root canal with gutta-percha points and the like. Is being done. A reamer or a file is a device used for enlarging a root canal in this root canal treatment, and is gripped by a finger or the like with a rod-shaped or needle-shaped metal cutting portion having a blade for cutting the inside of a tooth root canal. And a substantially cylindrical resin or metal handle for holding or mechanically holding the handle.

[0003] Such a dental root canal treatment instrument such as a reamer or a file cuts a living tissue such as a tooth substance at the time of root canal enlargement, and thus may be contaminated by bacteria or the like.
Ideally, it should be disposable for each patient, but in actual practice, it is often used repeatedly until cleaning, sterilization, disinfection, etc., and its performance such as machinability deteriorates after each use. It is. Therefore, great care is taken in cleaning, disinfection, disinfection, etc., and after cleaning treatment with ultrasonic waves etc., autoclave sterilization, ethylene oxide gas sterilization, dry heat sterilization, boiling disinfection, ultraviolet sterilization, chemical solution In order to prevent contamination by bacteria and the like, a treatment such as disinfection or the like is combined. In the first place, since the dental root canal treatment instrument is used in contact with the living body itself, it is necessary that the sterile condition be maintained until use,
Bacteria may adhere to other equipment for treatment or fingers during removal or storage after sterilization and disinfection, etc., and bacteria may adhere. There is a risk of developing infection.

[0004]

DISCLOSURE OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and is useful for the treatment of a root canal for dental use. An object is to provide an appliance.

[0005]

The present inventor has conducted intensive studies to solve the above-mentioned problems. As a result, the present inventors have found that a rod-shaped or needle-shaped metal cutting portion provided with a blade for cutting dentin and a substantially cylindrical cutting portion are provided. In a dental root canal treatment instrument such as a reamer or file composed of a resin handle and a file, if the resin handle is made of a heat-resistant resin containing an antibacterial agent, it is contained in the heat-resistant resin. The present invention was completed by investigating that the antibacterial agent was effective in suppressing the growth of bacteria adhering to the dental root canal treatment instrument and creating a situation in which bacteria and the like are unlikely to adhere and survive.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a dental root canal treatment instrument according to the present invention will be described in detail. FIG. 1 is an explanatory view of a dental reamer showing an example of a dental root canal treatment instrument according to the present invention, wherein 1 is a dental root canal treatment instrument comprising a dental reamer, 1a is a cutting portion, and 1b is It is the handle.

A dental root canal treatment instrument according to the present invention comprises a rod-shaped or needle-shaped metal cutting portion 1a having a blade for cutting dentin such as a reamer or a file, and a substantially cylindrical resin. Dental root canal treatment instrument 1 composed of a handle 1b made of
, Wherein the resin handle is made of a heat-resistant resin containing 0.2 to 5% by weight of an antibacterial agent.

[0008] A dental root canal treatment instrument such as a reamer or a file is usually a rod-shaped wire formed by twisting a wire such as a steel wire, a stainless wire, a Ti-Ni alloy wire into a spiral shape by machining. Or a needle-shaped metal cutting portion 1a and a substantially cylindrical handle portion 1b provided at one end as a portion to be gripped, and the handle portion 1b has the thickness of the cutting portion 1a based on international standards. It is made of a resin that is color-coded with a color code corresponding to the color code.

In the dental root canal treatment instrument according to the present invention having such a configuration, the heat-resistant resin used for the substantially cylindrical resin handle 1b does not deform even when it is sterilized by heating. As described above, a heat-resistant resin having a glass transition temperature (Tg) higher than 130 ° C. and a heat distortion temperature (HDT) higher than 110 ° C. is preferably used, and more preferably acids, alkalis, salts, etc. so that chemical solution sterilization can be used. Aqueous solutions and various solvents,
It is desirable that the resin is excellent in chemical resistance and is not affected by fats, oils, soaps and the like. Specific examples of such a resin include a polycarbonate resin, a polysulfone resin, a polypropylene resin, a U-polymer resin, a polyetherimide resin, a polyethersulfone resin, a polyamideimide resin, and an econol resin.

[0010] Antibacterial agents containing these heat-resistant resins include, as inorganic antibacterial agents, synthetic zeolites, calcium phosphate, vanadium phosphate, and silicic acid, which carry any one of silver ion, copper ion and zinc ion. There are calcium, silica gel, zirconium phosphate, amorphous, titanium oxide, oxide photocatalyst, etc. As organic antibacterial agents, phenol ether derivatives, sulfone derivatives,
There are imidazole derivatives and the like, which can be used alone or in combination of two or more. When the content of the antibacterial agent in the heat-resistant resin is less than 0.2% by weight, the effect as the antibacterial agent is not sufficiently obtained, and when the content exceeds 5% by weight, the physical properties of the heat-resistant resin itself deteriorate. In addition, no further effect as an antibacterial agent can be expected. Therefore, the content of the antibacterial agent in the heat-resistant resin is suitably in the range of 0.2 to 5% by weight, and in particular, when considering the balance between the properties of the heat-resistant resin and the performance of the antibacterial property, 0.5 to 3% by weight. % Is desirable.

The dental root canal treatment instrument according to the present invention having the above-mentioned structure can prevent bacteria and the like from adhering and suppress the proliferation as compared with the conventional dental root canal treatment instrument. It is significant in maintaining sterility until time.

[0012]

EXAMPLES Hereinafter, the dental root canal treatment instrument according to the present invention will be described in detail with reference to examples, but the present invention is not limited to these examples.

<Example 1> A resin in which 0.5% by weight of hydroxyapatite carrying silver ions (product name: "Apacider A" manufactured by Sanghi) was mixed with 99.5% by weight of polyetherimide resin pellets was heated at a heating temperature of 380 ° C and gold. Mold temperature 130 ° C,
Under a molding condition of high-speed injection of 80 mm / sec, a reamer was prepared by injecting into a mold in which a stainless steel reamer needle had been set in advance, and attaching a cylindrical handle having a diameter of 5 mm and a length of 10 mm.

<Examples 2 to 4, Comparative Examples 1 and 2>
A reamer was prepared in the same manner as in Example 1 except that the same resin and antibacterial agent as in Example 1 were used, and the amount of the antibacterial agent contained in the resin was changed to the ratio shown below.

[0015]

[Table 1]

The reamers prepared in these Examples and Comparative Examples were sterilized in an autoclave at 120 ° C. and 1.2 atm for 20 minutes, and subjected to an antibacterial test using Escherichia coli and Staphylococcus aureus according to the following procedure. . The results are summarized in Table 2. As an antibacterial test for Escherichia coli, an Escherichia coli suspension (1.5 × 10 ⁵ cells / m 2) previously prepared with physiological saline was used.
l) 0.3 ml was dropped on the handle of a reamer placed in a sterilized petri dish, covered with a polyethylene film that had been previously sterilized by ultraviolet light, and kept in an incubator at 35 ° C and a humidity of 95% for 24 hours to culture E. coli. The surface of the reamer stem was washed out with sterilized physiological saline, and the number of surviving bacteria in the solution was measured by a pour plate method (35 ° C., 48 hours) using a standard agar medium. As an antibacterial test for Staphylococcus aureus, the staphylococcus aureus suspension (5.5 × 1
0 ⁵ / ml) except for using the tested antimicrobial resistance in the same manner and antimicrobial tests for E. coli. As a control, 0.3 ml of each suspension of Escherichia coli and Staphylococcus aureus was dropped on a sterilized petri dish, and an antibacterial test was performed by the same operation as the above-mentioned antibacterial test.

[0017]

[Table 2]

Example 5 Antibacterial zeolite carrying silver ions at 99.5% by weight of polyethersulfone resin pellets for the resin of the handle (Shinagawa Fuel Co., Ltd .; product name "Zeomic")
A reamer was prepared and subjected to an antibacterial test in the same manner as in Example 1 except that a resin mixed with 0.5% by weight was used.

[0019]

[Table 3]

[0020]

As is evident from the results of the antibacterial test described in detail above, the dental root canal treatment device according to the present invention comprises:
Bacterial growth is suppressed, and the number of bacteria tends to decrease, and there is no danger of bacterial growth, etc., even after accidental sterilization and disinfection, etc. Things. Therefore, the dental root canal treatment device according to the present invention is extremely useful for preventing the infection of bacteria from the root canal to the living body, and can be performed only from bacteria from other devices and the like which are inherent in the dental clinic. It is also effective in preventing infection from bacteria brought in by other patients, and can be expected to provide safe and comfortable medical treatment for both the dental clinic and the patient, and greatly contributes to dental care It is.

[Brief description of the drawings]

FIG. 1 is an explanatory view of a dental reamer showing an example of a dental root canal treatment instrument according to the present invention.

[Explanation of symbols]

 1 dental root canal treatment instrument consisting of dental reamer 1a cutting part 1b handle

Claims (4)

[Claims] 1. A dental root comprising a rod-shaped or needle-shaped metal cutting portion (1a) provided with a blade for cutting dentin and a substantially cylindrical resin handle (1b). The dental canal treatment instrument (1), wherein the resin handle is made of a heat-resistant resin containing 0.2 to 5% by weight of an antibacterial agent. 2. The heat-resistant resin has a glass transition temperature (Tg).
The dental root canal treatment instrument according to claim 1, wherein the heat-resistant resin has a heat distortion temperature (HDT) higher than 130 ° C and higher than 110 ° C. 3. The heat-resistant resin is a polycarbonate resin,
The dental root canal treatment device according to claim 1, which is any one of a polysulfone resin, a polypropylene resin, a U-polymer resin, a polyetherimide resin, a polyethersulfone resin, a polyamideimide resin, and an econol resin. 4. An antimicrobial agent comprising a synthetic zeolite carrying an inorganic ion of any of silver ion, copper ion and zinc ion, calcium phosphate, vanadium phosphate, calcium silicate, silica gel, zirconium phosphate, amorphous,
An inorganic antibacterial agent selected from titanium oxide and oxide photocatalyst,
The dental root canal treatment device according to any one of claims 1 to 3, which is one or more organic antibacterial agents selected from a phenol ether derivative, a sulfone derivative, and an imidazole derivative.