JP2024041014A - files for root canal treatment - Google Patents

Abstract

[Problem] It was thought that if the root canal wall could be softened even when the file was dropped downward, the efficiency of treatment would be improved. [Solution] The H file 100 consists of a gripping part 101 and a needle part 102 at the tip. The metal of the needle part 102 is a nickel titanium (NiTi) alloy that has been pre-formed so that the taper angle after twisting is approximately 2 degrees, and a file surface 105 is provided on the surface, excluding the part that will later become the flute 104. The cutting edge 103 and flute 104 are formed on the needle part 102 by the twisting process. [Selected Figure] Figure 2

Description

The present invention relates to an H file mainly used for root canal treatment with high cutting efficiency.

A root canal is when a dentist scrapes the wall of the root of a patient's decayed tooth, removes a lump of pus stuck at the tip of the root, removes filling material left behind from previous treatment, and extracts the nerve. Instruments such as reamers and files are used when performing treatments such as. A reamer uses a twisting operation to enlarge and clean root canals. The so-called H file is a filing that is reciprocated in the vertical direction to ease and clean the root canal wall. There is something called a K file in between these, and it can perform both reaming and filing operations.

Note that when gutta-percha is removed using a dissolving agent, the gutta-percha remains in the root canal, which may impede subsequent treatment. For this reason, files are generally carefully removed.

When the metal needle of the H file is attached to the needle and reciprocated in the vertical direction as described above, when pulled upward, the cutting edge becomes a scraping blade and the root canal wall is soothed. By allowing the shavings at this time to enter the flute portion, which is the escape groove, the cutting edge can maximize its cutting ability without the shavings interfering with the cutting edge.

If you closely observe the operation of the cutting edge portion, you will see that the root canal wall is relieved when it is pulled upward during the reciprocating operation. In other words, when pushed downward, the cutting edge portion is not used at all. This is because the cutting edge portion is not designed that way.

Therefore, the present inventor thought that if the root canal wall could be healed even when the H file is dropped downward, the efficiency of treatment would be improved. An object of the present invention is to make root canal treatment as described above faster and more comfortable for both patients and dentists with less fatigue.

The inventor tried reaming the H file after coloring it. This is because we thought that if there was a part other than the cutting edge of the needle that was touching the root canal wall, the coloring in this part would have peeled off, revealing a smooth metal surface. As expected, the results showed that there were areas that touched the root canal wall. This was approximately the metal surface between the cutting edge and the flute. The inventor thought that this could be used to heal the root canal wall. Also, this must be applicable to other than H files.

The above object is achieved by providing a file for root canal treatment, which has a twisted metal needle portion and a filing surface approximately between the cutting edge and the flute. In other words, the metal surface roughly between the cutting edge part and the flute part is sanded to create a sanded surface. Sanding also includes laser processing.

It is preferable to use a metal for the needle portion, such as a nickel titanium (NiTi) alloy, which is less likely to cause allergic reactions to the body. It is common practice to twist such a long and thin metal plate so that the taper angle is approximately 2 degrees.

When the file for root canal treatment of the present invention is operated in a reciprocating manner in the vertical direction, the cutting edge portion normally exhibits the action of a scraping blade when pulled upward. On the other hand, when the file is dropped in a downward direction, the file surface will smooth the root canal wall as in the case where the file is colored and then the reaming operation is performed as described above. In other words, it becomes possible to enlarge and clean the root canal even when the file is pushed downward, improving the efficiency of treatment. Note that the presence of the flute used by the cutting edge is convenient as an escape route for the shavings at this time.

The above object is also achieved by providing a file for root canal treatment, which has a twisted metal needle portion and has a sandblasted surface approximately between the cutting edge and the flute. An abrasive is sprayed onto the metal surface roughly between the cutting edge and the flute to create a sandblasted surface.

When the abrasive is sprayed onto the metal surface, fine recesses are formed on the metal surface, allowing the root canal wall to be sanded in the same way as the file surface.

In addition, the above problem can be solved by creating a file for root canal treatment, which has a twisted metal needle part with a powdered abrasive adhesion surface roughly between the cutting edge and the flute. achieved. A powdered abrasive material is adhered to the metal surface approximately from the cutting edge portion to the flute portion.

Diamond powder can be used as this abrasive. An example of this is what is called a black diamond coating. Alternatively, it is possible to form a carbon nano film or the like by using carbon powder as an abrasive. Almost the same effect as in the case of diamond powder can be obtained.

Next, the file for root canal treatment of the present invention as described above may have a land on the cutting edge. The land portion is where the cutting edge is provided at an obtuse angle rather than an acute angle so that the back side of the cutting edge faces the root canal wall. If the root canal wall is cylindrical, this is the part that touches the cylinder.

The back side of the cutting edge, that is, the land portion comes into contact with the root canal wall with a predetermined width. This prevents the cutting edge from digging into the root canal wall, making it difficult to turn the file, and preventing the cutting edge from being damaged.

Further, the needle portion may be provided with an alternating contact point. The cutting edge portions that contact the root canal wall are formed alternately within one needle portion.

By reciprocating the root canal wall in the vertical direction, when there is a part where the cutting edge is about to dig into the root canal wall, it is possible to release that part from the contact pressure before the cutting edge digs into the root canal wall. You can get the same effect as Land.

In the present invention, the cutting edge may be masked before providing the metal needle with a file surface, a sandblast surface, or a surface to which a powdered abrasive is attached. Alternatively, when forming the sandblast surface, by spraying the abrasive from diagonally downward on the metal surface, a deeper edge can be formed on the upper side of the recess, which can better smooth the root canal wall. That's how you do it. Alternatively, when forming the sandblast surface, first spray an abrasive with relatively large particles, then spray an abrasive with relatively small particles, and form a mixture of large and small recesses. good. Alternatively, it is possible to provide a file surface, a sandblast surface, or a surface to which a powdered abrasive material is attached to the elongated metal plate before twisting. You can design this area freely.

In this invention, a file surface, a sandblast surface, or a surface to which powdered abrasive material is attached is provided roughly between the cutting edge and the flute, so even when the file is dropped downward on these surfaces, the root canal wall Now I can heal my body. It is now possible to enlarge and clean root canals even when the file is pushed downwards, using areas that were previously not utilized. This improves the efficiency of root canal treatment and allows the procedure to be performed more quickly, resulting in less fatigue and comfort for both patients and dentists.

FIG. 2 is an explanatory diagram of a file 100 according to the first embodiment. FIG. 2 is an explanatory diagram schematically showing a part of the file 100 in an enlarged manner. FIG. 3 is an explanatory diagram of a file 200 in Example 2. FIG. FIG. 2 is an explanatory diagram schematically showing an enlarged portion of a file 200. FIG. FIG. 7 is an explanatory diagram of a file 300 according to the third embodiment. FIG. 3 is an explanatory diagram schematically showing a part of a file 300 in an enlarged manner. FIG. 4 is an explanatory diagram schematically showing a cross section of a file 400 of Example 4. FIG.

Examples of the present invention will be described below based on the drawings, but the present invention is not limited thereto.

In this embodiment shown in FIGS. 1 and 2, the H file 100 is composed of a grip part 101 and a needle part 102 at the tip thereof, and the metal of this needle part 102 has an approximate taper angle after twisting. A preformed nickel titanium (NiTi) alloy is used. The surface of this nickel-titanium alloy is sanded to provide a filed surface 105, excluding the portion that will become the flute 104. Next, a needle portion 102 is made by twisting this nickel-titanium alloy, and a cutting edge 103 and a flute 104 are formed therein.

This H-file 100 is used to perform vertical reciprocating operations within the root canal. When pushed downward, the file surface 105 palms the root canal wall. When pulled upward, the cutting edge 103 acts as a scraping blade and scrapes up the root canal wall, as in the past. Furthermore, the shavings produced during these operations can escape into the flute 104 and be discharged from the root canal when the H file 100 is pulled upward.

This embodiment represented in FIGS. 3 and 4 concerns an H-file 200 consisting of a grip part 201 and a needle part 202. The needle portion 202 is made of a nickel titanium (NiTi) alloy that is preformed so that the taper angle after twisting is approximately 2 degrees. A sandblast surface 205 is formed on the surface of this nickel-titanium alloy by sandblasting the surface of the nickel-titanium alloy in advance, excluding the portion that will become the flute 204 . When this nickel-titanium alloy is twisted, a needle portion 202 having a cutting edge 203 and a flute 204 is obtained.

According to this H-file 200, when the H-file 200 is pushed downward in a reciprocating operation in the vertical direction within the root canal, the sandblasting surface 205 soothes the root canal wall.

The H file 300 of this embodiment shown in FIGS. 5 and 6 is composed of a grip portion 301 and a needle portion 302 at the tip thereof. Further, the metal of the needle portion 302 is a nickel titanium (NiTi) alloy that has been preformed so that the taper angle after twisting is approximately 2 degrees. A needle portion 302 is created by twisting this nickel-titanium alloy, and a cutting edge 303 and a flute 304 are formed therein. Next, the entire needle portion 302 of this H file 300 is coated with black diamond as an abrasive, thereby forming a black diamond coated surface 305.

The black diamond coated surface 305 also extends to the flute 304, but this causes almost no problem. In any case, when the H file 300 is pushed downward, the root canal wall will be soothed by the black diamond coating surface 305. Note that when the H file 300 is pulled upward, the cutting edge 303 acts as a scraping blade to soothe the root canal wall.

FIG. 7 is a cross-sectional view of the needle portion 401 of the H file 400 of this embodiment. A feature is that a land 403 is provided on the cutting edge 402 of the needle portion 401. Note that the reference numeral 404 indicates a flute, and the reference numeral 405 indicates a coating surface. This coating surface 405 is to be coated with a carbon nano film.

By providing the land 403 on the cutting edge 402, it is possible to prevent the cutting edge 402 from biting into the root canal wall. On the other hand, when the H file 400 is pushed downward, the root canal wall is soothed by the carbon nano film coating surface 405.

Although this embodiment will be described without reference to drawings, the needle portion is equipped with a conventional alternating contact point. That is, the cutting edge portions that contact the root canal wall are formed alternately within one needle portion, and the same effect as the land 403 described in the fourth embodiment can be obtained.

According to this invention, when the file is pulled upward, the cutting edge part becomes a scraping blade, which not only allows the root canal wall to be healed, but also when the file is dropped in the upward direction, the root canal wall can be healed. Now I can do things. This improves the efficiency of root canal treatment, allowing the procedure to be performed more quickly, and greatly reducing the burden on dentists and patients, so the industrial value of this invention is extremely high. There is. Note that this invention may be used in the field of veterinary medicine.

100: H file 101: Gripping part 102: Needle part 103: Cutting edge 104: Flute 105: File surface 200: H file 201: Gripping part 202: Needle part 203: Cutting edge 204: Flute 205: Sandblasting surface 300: H file 301: Gripping part 302: Needle part 303: Cutting edge 304: Flute 305: Application surface 400: H file 401: Needle part 402: Cutting edge 403: Land 404: Flute 405: Application surface

Claims (5)

A root canal treatment file with a twisted metal needle and a file surface roughly between the cutting edge and the flute. A root canal treatment file with a twisted metal needle and a sandblasted surface roughly between the cutting edge and the flute. A root canal treatment file that has a twisted metal needle with a powdered abrasive attachment surface roughly between the cutting edge and the flute. The file for root canal treatment according to any one of claims 1 to 3, wherein the cutting edge has a land. The root canal treatment file according to any one of claims 1 to 3, wherein the needle portion includes an alternating contact point.

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