WO2024058080A1 - Root canal treatment file - Google Patents

Root canal treatment file Download PDF

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Publication number
WO2024058080A1
WO2024058080A1 PCT/JP2023/032927 JP2023032927W WO2024058080A1 WO 2024058080 A1 WO2024058080 A1 WO 2024058080A1 JP 2023032927 W JP2023032927 W JP 2023032927W WO 2024058080 A1 WO2024058080 A1 WO 2024058080A1
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root canal
file
canal treatment
cutting edge
needle
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PCT/JP2023/032927
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French (fr)
Japanese (ja)
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計芳 鈴木
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計芳 鈴木
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Publication of WO2024058080A1 publication Critical patent/WO2024058080A1/en

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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
    • A61C5/00—Filling or capping teeth
    • A61C5/40—Implements for surgical treatment of the roots or nerves of the teeth; Nerve needles; Methods or instruments for medication of the roots
    • A61C5/42—Files for root canals; Handgrips or guiding means therefor

Definitions

  • the present invention relates to files for root canal treatment such as H files.
  • the dentist scrapes the wall of the root of a patient's decayed tooth, removes the pus clogged at the tip of the tooth root and/or the filling material that remains from treatment, and removes the nerve.
  • Instruments such as reamers and/or files are used in performing the treatment.
  • a reamer is used for enlarging and/or cleaning root canals by twisting reaming.
  • the so-called H file is an instrument that grinds and cleans the root canal wall by reciprocating the file in the vertical direction. In between these is a so-called K file, which allows both reaming and filing operations.
  • gutta-percha When gutta-percha is removed with a dissolving agent, it tends to remain in the root canal and may interfere with subsequent treatment, so generally gutta-percha is removed with a file.
  • the cutting edge When the metal needle of the H file is reciprocated in the vertical direction, the cutting edge functions as a scraping blade and grinds the root canal wall. When the shavings enter the groove, the cutting function of the cutting edge is prevented from being inhibited by the shavings.
  • an object of the present invention is to provide a root canal treatment file that can improve the efficiency of root canal treatment.
  • the root canal treatment file of the present invention is Equipped with a metal needle with a spirally extending cutting edge and a flute, At least a portion of the needle portion other than the cutting edge has an uneven structure.
  • the needle portion A spirally extending cutting edge functions as a scraping blade to grind the root canal wall.
  • the root canal wall is ground due to the uneven structure of at least a portion of the file excluding the cutting edge. That is, even when the file is moved downward, the root canal can be enlarged and/or cleaned, improving treatment efficiency. Since the shavings at this time are allowed to escape into the flute of the needle portion, the deterioration of the grinding function of the root canal wall due to the cutting edge and the uneven structure is avoided by the shavings.
  • At least a portion of the surface of the needle portion other than the cutting edge and the defined surface of the flute has an uneven structure.
  • the cutting edge extends in a spiral along the upper edge of each of the convex curved surface on the front side that extends in a spiral manner of the needle part and the concave curved surface on the back side as a defining surface of the flute, It is preferable that at least a portion of the convex curved surface has the uneven structure.
  • the uneven structure is constituted by at least one of file marks, sandblasting marks, and an abrasive grain layer made of abrasive grains and an adhesive.
  • the cutting edge is constituted by an edge of a land that has a constant width in the circumferential direction of the needle and extends spirally along a conical side surface or a cylindrical side along the outer shape of the needle; Preferably, the cutting edge is formed at an obtuse angle in the cross section.
  • the land which has a constant width in the circumferential direction of the needle portion and whose edge constitutes the cutting edge, comes into contact with the root canal wall. Further, the cutting edge is formed at an obtuse angle in the cross section of the needle portion. Therefore, it is possible to avoid a situation in which the cutting edge digs into the root canal wall during reaming with the file, preventing rotation of the file or damaging the cutting edge.
  • the needle portion is provided with alternating contact points.
  • a part of the spirally extending cutting edge that is one pitch away from a part that contacts the root canal wall (contact part) is a part that does not contact the root canal wall (non-contact part).
  • the area is designed so that the area that is further shifted by one pitch from the non-contact area becomes the contact area.
  • FIG. 2 is an explanatory diagram of a file configuration according to an embodiment of the present invention.
  • FIG. 2 is an enlarged explanatory diagram of a needle portion of a file as an embodiment of the present invention.
  • FIG. 4 is a cross-sectional view of a file as another embodiment of the present invention.
  • FIG. 6 is an explanatory diagram of a file configuration according to another embodiment of the present invention.
  • the needle portion 12 extends parallel to the needle portion 12 .
  • the needle portion 12 is formed, for example, by twisting an elongated metal plate so that the taper angle is within the range of 30° to 60° or 40° to 50°.
  • the metal plate for example, a plate made of a nickel titanium (Ni-Ti) alloy is employed.
  • Ni-Ti alloys have various crystal structures such as austenitic, R-phase or martensitic phases.
  • the Ni—Ti alloy may contain or be doped with Co, Cu, or the like.
  • the needle portion 12 has a cutting edge 120, a land 121, and a flute 122 that extend in a spiral manner.
  • the land 121 is a convex curved surface (a curved surface extending spirally along a substantially conical side surface or a substantially cylindrical side surface) that becomes the front side when the metal plate is twisted.
  • the flute 122 or groove portion is a portion defined by a concave curved surface (a curved surface extending spirally along a substantially conical side surface or a substantially cylindrical side surface) that becomes the back side when the metal plate is twisted.
  • a portion of the needle portion 12 excluding the cutting edge 120 and the flute 122 (a portion between the cutting edge 120 and the flute 122), that is, at least a portion of the land 121 has an uneven structure.
  • the uneven structure is composed of at least one of file marks S1, sandblasting marks S2, and abrasive layer S3.
  • file marks S1 may be formed in a region corresponding to at least a part of the land 121 of the needle part 12 in a metal plate that is a raw material of the needle part 12 by laser processing.
  • the spacing between the rasps is adjusted to fall within a range of 5 to 500 ⁇ m, for example.
  • the rasp eyes may be single eyes, compound eyes, wavy eyes, onime eyes, or a combination thereof.
  • the needle portion 12 in which the file marks S1 as an uneven structure are formed on at least a portion of the land 121 is manufactured.
  • file marks S1 may be formed in a region corresponding to at least a portion of the land 121 of the needle portion 12. Areas other than the areas where the file marks S1 are formed on the metal plate may be masked in advance.
  • sandblasting marks S2 may be formed in a region corresponding to at least a part of the land 121 of the metal plate.
  • abrasive grains such as silicon carbide, aluminum oxide, diamond and/or cubic boron nitride (CBN) with an average grain size of 5 to 100 ⁇ m are used, for example.
  • CBN cubic boron nitride
  • a file 1 having a needle portion 12 in which a sandblasting trace S2 as an uneven structure is formed on at least a portion of the land 121 is produced.
  • sandblasting marks S2 may be formed in a region corresponding to at least a part of the land 121 of the needle part 12. Areas other than the area where the sandblasting marks S2 are formed on the metal plate may be masked.
  • etching marks or roughening marks may be formed in at least a portion of the land 121 as an uneven structure by etching using oxalic acid or the like.
  • an abrasive grain layer S3 made of the abrasive grains and the adhesive is formed. good.
  • the abrasive grains for example, silicon carbide, aluminum oxide, diamond, and/or cubic boron nitride (CBN) having an average grain size of 5 to 100 ⁇ m are used.
  • the abrasive grain layer S3 may be formed entirely on the surface of the needle portion 12.
  • FIG. 3 shows a cross-sectional view of the needle portion 12 of the file 1 as another embodiment.
  • the edge of the land 124 of the needle portion 12 constitutes a cutting edge 120.
  • the land 124 has a constant width in the circumferential direction of the needle portion 12 and extends in a spiral shape along a substantially conical side surface or a substantially cylindrical side surface along the outer shape of the needle portion 12.
  • the cutting edge 120 is formed not at an acute angle but at an obtuse angle (for example, within the range of 100° to 135°) in the cross section of the needle portion 12.
  • a carbon nano film layer S4 is formed on the concave curved surface defining the flute 122.
  • the land 124 which has a constant width in the circumferential direction of the needle portion 12 and whose edge constitutes the cutting edge 120, comes into contact with the root canal wall. Furthermore, the cutting edge 120 is formed at an obtuse angle in the cross section of the needle portion 12. Therefore, it is possible to avoid a situation in which the cutting edge 120 digs into the root canal wall during reaming with the file 1, preventing rotation of the file 1 or damaging the cutting edge 120.
  • the cutting edge 120 extending spirally in the needle portion 12 functions as a scraping blade to grind the root canal wall. Further, when the file 1 is moved downward, the root canal wall is ground by the carbon nano film layer S4, which is the uneven structure of at least a portion of the land 121 of the needle part 12.
  • the needle portion 12 has an alternating contact point.
  • a part of the cutting edge 120 extending in a spiral shape that is shifted by one pitch from a part that contacts the root canal wall (contact part CP) becomes a part that does not contact the root canal wall (non-contact part), and is separated from the non-contact part.
  • the contact portion CP is designed so that the portion shifted by one pitch further becomes the contact portion CP.
  • the contact point is removed before the cutting edge 120 bites into the root canal wall at the contact area CP.
  • Site CP is released from contact pressure. Therefore, it is possible to avoid a situation in which the cutting edge 120 digs into the root canal wall during reaming with the file 1, preventing rotation of the file or damaging the cutting edge 120.
  • the present invention is applicable not only to H files but also to various root canal treatment files such as reamers, K files, and RT files.
  • the cutting edge 120 when the file 1 is moved upward, the cutting edge 120 not only functions as a scraping blade to grind the root canal wall, but also when the file 1 is moved downward. Also, the root canal wall is ground by the uneven structure S1 formed on the land 121 and the like. This improves the efficiency of root canal treatment and reduces the burden on dentists and patients, so the industrial value of the present invention is extremely high.
  • the present invention is also applicable to the veterinary field.

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  • Health & Medical Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • Neurology (AREA)
  • Neurosurgery (AREA)
  • Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
  • Surgery (AREA)
  • Oral & Maxillofacial Surgery (AREA)
  • Dentistry (AREA)
  • Epidemiology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Dental Tools And Instruments Or Auxiliary Dental Instruments (AREA)

Abstract

Provided is a root canal treatment file capable of improving root canal treatment efficiency. When a file (1) is moved upwards according to the vertical reciprocating movement (filing), a cutting edge (120) spirally extending in a needle unit (12) functions as a scraping blade to grind the root canal wall. Further, when the file (1) is moved downwards, the root canal wall is ground by means of uneven structure (S1), (S2) and/or (S3) of at least a part of a land (121) of the needle unit (12).

Description

根管治療用ファイルRoot canal treatment file
　本発明は、Ｈファイルなどの根管治療用ファイルに関する。 The present invention relates to files for root canal treatment such as H files.
　歯科医師が患者の虫歯の根の壁面をこそぎ取ったり、歯根の先に詰まっている膿の塊および／または治療跡である充填材を取り去ったり、神経を抜いたりするなどの根管等の治療を行う際に、リーマおよび／またはファイルなどの器具が用いられる。リーマは捩る操作のリーミングで根管拡大および／または清掃を行うものである。いわゆるＨファイルは上下方向に往復動させる操作のファイリングで根管壁を研削したり清掃したりする器具である。これらの中間にいわゆるＫファイルがあり、リーミングおよびファイリングの両方の作業が可能である。 The dentist scrapes the wall of the root of a patient's decayed tooth, removes the pus clogged at the tip of the tooth root and/or the filling material that remains from treatment, and removes the nerve. Instruments such as reamers and/or files are used in performing the treatment. A reamer is used for enlarging and/or cleaning root canals by twisting reaming. The so-called H file is an instrument that grinds and cleans the root canal wall by reciprocating the file in the vertical direction. In between these is a so-called K file, which allows both reaming and filing operations.
　ガッタパーチャが溶解剤により除去される場合、ガッタパーチャが根管に残りやすく、その後の治療に支障をきたすことがあるため、一般的にはガッタパーチャはファイルにより除去されている。 When gutta-percha is removed with a dissolving agent, it tends to remain in the root canal and may interfere with subsequent treatment, so generally gutta-percha is removed with a file.
　Ｈファイルの金属製の針部が上下方向に往復動されると、上方向に動かされる際にカッティングエッジが掻き上げ刃として機能して根管壁が研削される。削りかすが溝部に入り込むことにより、当該削りかすによりカッティングエッジの切削機能が阻害されることが防止される。 When the metal needle of the H file is reciprocated in the vertical direction, the cutting edge functions as a scraping blade and grinds the root canal wall. When the shavings enter the groove, the cutting function of the cutting edge is prevented from being inhibited by the shavings.
　しかし、Ｈファイルなどのファイルが下方向に動かされる際には、前記のように掻き上げ刃として機能するカッティングエッジによる切削機能は発揮されない。 However, when a file such as an H file is moved downward, the cutting function of the cutting edge, which functions as a scraping blade, is not exerted as described above.
　そこで、本発明は、根管治療の効率化の向上を図りうる根管治療用ファイルを提供することを目的とする。 Therefore, an object of the present invention is to provide a root canal treatment file that can improve the efficiency of root canal treatment.
　本発明の根管治療用ファイルは、
　らせん状に延在するカッティングエッジおよびフルートを有する金属製の針部を備え、
　前記針部の前記カッティングエッジを除く少なくとも一部が凹凸構造を有している。 The root canal treatment file of the present invention is
Equipped with a metal needle with a spirally extending cutting edge and a flute,
At least a portion of the needle portion other than the cutting edge has an uneven structure.
　当該構成の根管治療用ファイル（以下、単に「ファイル」ともいう。）によれば、上下方向の往復動の操作（ファイリング）に応じて、ファイルが上方向に動かされた際に、針部においてらせん状に延在しているカッティングエッジが掻き上げ刃として機能して根管壁が研削される。さらに、ファイルが下方向に動かされた際に、カッティングエッジを除く少なくとも一部が有する凹凸構造によって根管壁が研削される。すなわち、ファイルが下方向に動かされた際にも根管の拡大および／または清掃が可能になり、治療効率の向上が図られる。この際の削りかすは、針部のフルートに逃がされるので、当該削りかすによって、カッティングエッジおよび凹凸構造による根管壁の研削機能の低下が回避されている。 According to the root canal treatment file (hereinafter also simply referred to as "file") having this configuration, when the file is moved upward in response to the vertical reciprocating operation (filing), the needle portion A spirally extending cutting edge functions as a scraping blade to grind the root canal wall. Further, when the file is moved downward, the root canal wall is ground due to the uneven structure of at least a portion of the file excluding the cutting edge. That is, even when the file is moved downward, the root canal can be enlarged and/or cleaned, improving treatment efficiency. Since the shavings at this time are allowed to escape into the flute of the needle portion, the deterioration of the grinding function of the root canal wall due to the cutting edge and the uneven structure is avoided by the shavings.
　前記構成の根管治療用ファイルにおいて、
　前記針部の前記カッティングエッジおよび前記フルートの画定面を除く表面の少なくとも一部が凹凸構造を有している
ことが好ましい。 In the root canal treatment file having the above configuration,
It is preferable that at least a portion of the surface of the needle portion other than the cutting edge and the defined surface of the flute has an uneven structure.
　前記構成の根管治療用ファイルにおいて、
　前記針部のらせん状に延在する表側の凸曲面と前記フルートの画定面としての裏側の凹曲面とのそれぞれの上縁部に沿って前記カッティングエッジがらせん状に延在し、
　前記凸曲面の少なくとも一部が前記凹凸構造を有している
ことが好ましい。 In the root canal treatment file having the above configuration,
The cutting edge extends in a spiral along the upper edge of each of the convex curved surface on the front side that extends in a spiral manner of the needle part and the concave curved surface on the back side as a defining surface of the flute,
It is preferable that at least a portion of the convex curved surface has the uneven structure.
　前記構成の根管治療用ファイルにおいて、
　前記凹凸構造が、ヤスリ目と、サンドブラスト加工痕と、砥粒および接着剤からなる砥粒層と、のうち少なくとも1つにより構成されている
ことが好ましい。 In the root canal treatment file having the above configuration,
It is preferable that the uneven structure is constituted by at least one of file marks, sandblasting marks, and an abrasive grain layer made of abrasive grains and an adhesive.
　前記構成の根管治療用ファイルにおいて、
　前記針部の周方向に一定幅を有し、前記針部の外形に沿った円錐側面または円筒側面に沿ってらせん状に延在するランドの縁部により前記カッティングエッジが構成され、前記針部の横断面において前記カッティングエッジが鈍角に形成されている
ことが好ましい。 In the root canal treatment file having the above configuration,
The cutting edge is constituted by an edge of a land that has a constant width in the circumferential direction of the needle and extends spirally along a conical side surface or a cylindrical side along the outer shape of the needle; Preferably, the cutting edge is formed at an obtuse angle in the cross section.
　当該構成の根管治療用ファイルによれば、針部の周方向に一定幅を有し、その縁部がカッティングエッジを構成するランドが根管壁に接触する。また、針部の横断面においてカッティングエッジが鈍角に形成されている。このため、ファイルによるリーミングに際してカッティングエッジが根管壁に食い込んでファイルの回転が妨げられたり、カッティングエッジが破損したりする事態が回避されうる。 According to the root canal treatment file having this configuration, the land, which has a constant width in the circumferential direction of the needle portion and whose edge constitutes the cutting edge, comes into contact with the root canal wall. Further, the cutting edge is formed at an obtuse angle in the cross section of the needle portion. Therefore, it is possible to avoid a situation in which the cutting edge digs into the root canal wall during reaming with the file, preventing rotation of the file or damaging the cutting edge.
　前記構成の根管治療用ファイルにおいて、
　前記針部がオルタネーティングコンタクトポイントを備えている
ことが好ましい。 In the root canal treatment file having the above configuration,
Preferably, the needle portion is provided with alternating contact points.
　当該構成の根管治療用ファイルによれば、らせん状に延在するカッティングエッジにおいて根管壁に接触する部位（接触部位）から１ピッチずれた部位が根管壁に接触しない部位（非接触部位）になり、非接触部位からさらに１ピッチずれた部位が接触部位になるように設計されている。ファイルが上下方向に往復動されることで根管壁が研削される際、カッティングエッジが接触部位において根管壁に食い込む前に当該接触部位が接触圧から解放される。このため、ファイルによるリーミングに際してカッティングエッジが根管壁に食い込んでファイルの回転が妨げられたり、カッティングエッジが破損したりする事態が回避されうる。 According to the root canal treatment file with this configuration, a part of the spirally extending cutting edge that is one pitch away from a part that contacts the root canal wall (contact part) is a part that does not contact the root canal wall (non-contact part). ), and the area is designed so that the area that is further shifted by one pitch from the non-contact area becomes the contact area. When the root canal wall is ground by reciprocating the file in the vertical direction, the contact area is released from the contact pressure before the cutting edge bites into the root canal wall at the contact area. Therefore, it is possible to avoid a situation in which the cutting edge digs into the root canal wall during reaming with the file, preventing rotation of the file or damaging the cutting edge.
本発明の一実施形態としてのファイルの構成説明図。FIG. 2 is an explanatory diagram of a file configuration according to an embodiment of the present invention. 本発明の一実施形態としてのファイルの針部の拡大説明図。FIG. 2 is an enlarged explanatory diagram of a needle portion of a file as an embodiment of the present invention. 本発明の他の実施形態としてのファイルの横断面図。FIG. 4 is a cross-sectional view of a file as another embodiment of the present invention. 本発明の他の実施形態としてのファイルの構成説明図。FIG. 6 is an explanatory diagram of a file configuration according to another embodiment of the present invention.
　図１に示されている本発明の一実施形態としての根管治療用ファイル１は、Ｈファイルであり、略円柱状のハンドル１０と、ハンドル１０の一端部の中央箇所からハンドル１０の中心軸線に平行に延在する針部１２と、を備えている。針部１２は、例えば、テーパー角が３０°～６０°または４０°～５０°の範囲に含まれるように、細長い金属板がねじり加工されることにより形成されている。当該金属板として、例えばニッケルチタン（Ｎｉ－Ｔｉ）合金製の板が採用される。Ｎｉ－Ｔｉ合金は、オーステナイト相、Ｒ相またはマルテンサイト相などのさまざまな結晶構造を有する。Ｎｉ－Ｔｉ合金には、Ｃｏ、Ｃｕなどが含有またはドープされていてもよい。 A root canal treatment file 1 as an embodiment of the present invention shown in FIG. The needle portion 12 extends parallel to the needle portion 12 . The needle portion 12 is formed, for example, by twisting an elongated metal plate so that the taper angle is within the range of 30° to 60° or 40° to 50°. As the metal plate, for example, a plate made of a nickel titanium (Ni-Ti) alloy is employed. Ni-Ti alloys have various crystal structures such as austenitic, R-phase or martensitic phases. The Ni—Ti alloy may contain or be doped with Co, Cu, or the like.
　図１および図２に示されているように、針部１２は、らせん状に延在するカッティングエッジ１２０、ランド１２１およびフルート１２２を有している。ランド１２１は、金属板がねじり加工される際に表側になる凸曲面（略円錐側面または略円筒側面に沿ってらせん状に延在する曲面）の部分である。フルート１２２または溝部は、金属板がねじり加工される際に裏側になる凹曲面（略円錐側面または略円筒側面に沿ってらせん状に延在する曲面）により画定される部分である。 As shown in FIGS. 1 and 2, the needle portion 12 has a cutting edge 120, a land 121, and a flute 122 that extend in a spiral manner. The land 121 is a convex curved surface (a curved surface extending spirally along a substantially conical side surface or a substantially cylindrical side surface) that becomes the front side when the metal plate is twisted. The flute 122 or groove portion is a portion defined by a concave curved surface (a curved surface extending spirally along a substantially conical side surface or a substantially cylindrical side surface) that becomes the back side when the metal plate is twisted.
　針部１２のカッティングエッジ１２０およびフルート１２２を除く部分（カッティングエッジ１２０とフルート１２２との間の部分）、すなわちランド１２１の少なくとも一部が凹凸構造を有している。図２に模式的に示されているように、凹凸構造は、ヤスリ目Ｓ１と、サンドブラスト加工痕Ｓ２と、砥粒層Ｓ３と、のうち少なくとも1つにより構成されている。 A portion of the needle portion 12 excluding the cutting edge 120 and the flute 122 (a portion between the cutting edge 120 and the flute 122), that is, at least a portion of the land 121 has an uneven structure. As schematically shown in FIG. 2, the uneven structure is composed of at least one of file marks S1, sandblasting marks S2, and abrasive layer S3.
　例えばレーザー加工により、針部１２の原材料である金属板において、当該針部１２のランド１２１の少なくとも一部に相当する領域にヤスリ目Ｓ１が形成されてもよい。ヤスリ目の間隔は、例えば、５～５００μｍの範囲に含まれるように調整される。ヤスリ目は、単目、複目、波目もしくは鬼目またはこれらの組み合わせであってもよい。そのうえで、当該金属板がねじり加工されることにより、ランド１２１の少なくとも一部に凹凸構造としてのヤスリ目Ｓ１が形成されている針部１２が作製される。針部１２が作製された後、当該針部１２のランド１２１の少なくとも一部に相当する領域にヤスリ目Ｓ１が形成されてもよい。金属板においてヤスリ目Ｓ１が形成される領域以外の領域があらかじめマスキングされていてもよい。 For example, file marks S1 may be formed in a region corresponding to at least a part of the land 121 of the needle part 12 in a metal plate that is a raw material of the needle part 12 by laser processing. The spacing between the rasps is adjusted to fall within a range of 5 to 500 μm, for example. The rasp eyes may be single eyes, compound eyes, wavy eyes, onime eyes, or a combination thereof. Then, by twisting the metal plate, the needle portion 12 in which the file marks S1 as an uneven structure are formed on at least a portion of the land 121 is manufactured. After the needle portion 12 is manufactured, file marks S1 may be formed in a region corresponding to at least a portion of the land 121 of the needle portion 12. Areas other than the areas where the file marks S1 are formed on the metal plate may be masked in advance.
　サンドブラスト加工により、金属板のランド１２１の少なくとも一部に相当する領域にサンドブラスト痕Ｓ２が形成されてもよい。サンドブラスト加工には、例えば、平均粒径５～１００μｍの炭化ケイ素、酸化アルミニウム、ダイヤモンドおよび／または立方晶窒化ホウ素（ＣＢＮ）などの砥粒が用いられる。針部１２の先端部（または下部）から基端部（または上部）に向かう方向に砥粒が当該領域に吹き付けられることにより、基端部寄りにより深いエッジを形成させて、根管壁の研削機能の向上が図られてもよい。第１段階で比較的大径の砥粒が当該領域に吹き付けられ、第２段階で比較的小径の砥粒が当該領域に吹き付けられることにより、大きさが異なる凹部がサンドブラスト加工痕Ｓ２に混在していてもよい。当該金属板がねじり加工されることにより、ランド１２１の少なくとも一部に凹凸構造としてのサンドブラスト加工痕Ｓ２が形成されている針部１２を有するファイル１が作製される。針部１２が作製された後、当該針部１２のランド１２１の少なくとも一部に相当する領域にサンドブラスト加工痕Ｓ２が形成されてもよい。金属板においてサンドブラスト痕Ｓ２が形成される領域以外の領域がマスキングされていてもよい。 By sandblasting, sandblasting marks S2 may be formed in a region corresponding to at least a part of the land 121 of the metal plate. For sandblasting, abrasive grains such as silicon carbide, aluminum oxide, diamond and/or cubic boron nitride (CBN) with an average grain size of 5 to 100 μm are used, for example. By spraying abrasive grains in the direction from the distal end (or lower part) to the proximal end (or upper part) of the needle part 12, a deeper edge is formed near the proximal end, thereby grinding the root canal wall. Functional improvements may also be made. In the first step, relatively large-diameter abrasive grains are sprayed onto the region, and in the second step, relatively small-diameter abrasive grains are sprayed onto the region, so that concavities of different sizes are mixed in the sandblasting trace S2. You can leave it there. By twisting the metal plate, a file 1 having a needle portion 12 in which a sandblasting trace S2 as an uneven structure is formed on at least a portion of the land 121 is produced. After the needle part 12 is produced, sandblasting marks S2 may be formed in a region corresponding to at least a part of the land 121 of the needle part 12. Areas other than the area where the sandblasting marks S2 are formed on the metal plate may be masked.
　サンドブラスト加工に代えて、シュウ酸等を用いたエッチング加工によりランド１２１の少なくとも一部に凹凸構造としてエッチング痕または粗面化処理痕が形成されてもよい。 Instead of sandblasting, etching marks or roughening marks may be formed in at least a portion of the land 121 as an uneven structure by etching using oxalic acid or the like.
　砥粒（または粒状研磨材）が接着剤により金属板のランド１２１の少なくとも一部に相当する領域に接着されることにより、当該砥粒および当該接着剤からなる砥粒層Ｓ３が形成されてもよい。砥粒としては、例えば、平均粒径５～１００μｍの炭化ケイ素、酸化アルミニウム、ダイヤモンドおよび／または立方晶窒化ホウ素（ＣＢＮ）などが用いられる。砥粒層Ｓ３は、針部１２の表面に全体的に形成されていてもよい。 By bonding the abrasive grains (or granular abrasive material) with an adhesive to a region corresponding to at least a part of the land 121 of the metal plate, an abrasive grain layer S3 made of the abrasive grains and the adhesive is formed. good. As the abrasive grains, for example, silicon carbide, aluminum oxide, diamond, and/or cubic boron nitride (CBN) having an average grain size of 5 to 100 μm are used. The abrasive grain layer S3 may be formed entirely on the surface of the needle portion 12.
　（作用効果）
　当該構成のファイル１によれば、上下方向の往復動の操作（ファイリング）に応じて、ファイル１が上方向に動かされた際に、針部１２においてらせん状に延在しているカッティングエッジ１２０が掻き上げ刃として機能して根管壁が研削される。さらに、ファイル１が下方向に動かされた際に、針部１２のランド１２１の少なくとも一部が有する凹凸構造Ｓ１、Ｓ２および／またはＳ３によって根管壁が研削される。すなわち、ファイル１が下方向に動かされた際にも根管の拡大および／または清掃が可能になり、治療効率の向上が図られる。この際の削りかすは、針部１２のフルート１２２に逃がされるので、当該削りかすによって、カッティングエッジ１２０および凹凸構造Ｓ１、Ｓ２および／またはＳ３による根管壁の研削機能の低下が回避されている。 (effect)
According to the file 1 having this configuration, when the file 1 is moved upward in response to a reciprocating operation (filing) in the vertical direction, the cutting edge 120 extending in a spiral shape in the needle portion 12 acts as a scraping blade and grinds the root canal wall. Furthermore, when the file 1 is moved downward, the root canal wall is ground by the uneven structure S1, S2, and/or S3 that is included in at least a portion of the land 121 of the needle portion 12. That is, even when the file 1 is moved downward, the root canal can be enlarged and/or cleaned, and treatment efficiency can be improved. The shavings at this time are allowed to escape into the flute 122 of the needle portion 12, so that the shavings prevent the cutting edge 120 and the uneven structures S1, S2, and/or S3 from degrading the grinding function of the root canal wall. .
　（本発明の他の実施形態）
　図３には、他の実施形態としてのファイル１の針部１２の横断面図が示されている。図３に示されているように、針部１２のランド１２４の縁部によりカッティングエッジ１２０が構成されている。ランド１２４は、針部１２の周方向に一定幅を有し、針部１２の外形に沿った略円錐側面または略円筒側面に沿ってらせん状に延在している。図３に示されているように、針部１２の横断面においてカッティングエッジ１２０が鋭角ではなく鈍角（例えば、１００°～１３５°の範囲に含まれる）に形成されている。フルート１２２を画定する凹曲面にカーボンナノ皮膜層Ｓ４が形成されている。 (Other embodiments of the present invention)
FIG. 3 shows a cross-sectional view of the needle portion 12 of the file 1 as another embodiment. As shown in FIG. 3, the edge of the land 124 of the needle portion 12 constitutes a cutting edge 120. The land 124 has a constant width in the circumferential direction of the needle portion 12 and extends in a spiral shape along a substantially conical side surface or a substantially cylindrical side surface along the outer shape of the needle portion 12. As shown in FIG. 3, the cutting edge 120 is formed not at an acute angle but at an obtuse angle (for example, within the range of 100° to 135°) in the cross section of the needle portion 12. A carbon nano film layer S4 is formed on the concave curved surface defining the flute 122.
　当該構成のファイル１によれば、針部１２の周方向に一定幅を有し、その縁部がカッティングエッジ１２０を構成するランド１２４が根管壁に接触する。また、針部１２の横断面においてカッティングエッジ１２０が鈍角に形成されている。このため、ファイル１によるリーミングに際してカッティングエッジ１２０が根管壁に食い込んでファイル１の回転が妨げられたり、カッティングエッジ１２０が破損したりする事態が回避されうる。 According to the file 1 having this configuration, the land 124, which has a constant width in the circumferential direction of the needle portion 12 and whose edge constitutes the cutting edge 120, comes into contact with the root canal wall. Furthermore, the cutting edge 120 is formed at an obtuse angle in the cross section of the needle portion 12. Therefore, it is possible to avoid a situation in which the cutting edge 120 digs into the root canal wall during reaming with the file 1, preventing rotation of the file 1 or damaging the cutting edge 120.
　また、前記実施形態と同様に、ファイリングに際して、針部１２においてらせん状に延在しているカッティングエッジ１２０が掻き上げ刃として機能して根管壁が研削される。さらに、ファイル１が下方向に動かされた際に、針部１２のランド１２１の少なくとも一部が有する凹凸構造であるカーボンナノ皮膜層Ｓ４によって根管壁が研削される。 Furthermore, similarly to the embodiment described above, during filing, the cutting edge 120 extending spirally in the needle portion 12 functions as a scraping blade to grind the root canal wall. Further, when the file 1 is moved downward, the root canal wall is ground by the carbon nano film layer S4, which is the uneven structure of at least a portion of the land 121 of the needle part 12.
　図４に示されている本発明の他の実施形態としてのファイル１は、針部１２がオルタネーティングコンタクトポイント（Ａｌｔｅｒｎａｔｉｎｇ　Ｃｏｎｔａｃｔ　Ｐｏｉｎｔ）を有している。すなわち、らせん状に延在するカッティングエッジ１２０において根管壁に接触する部位（接触部位ＣＰ）から１ピッチずれた部位が根管壁に接触しない部位（非接触部位）になり、非接触部位からさらに１ピッチずれた部位が接触部位ＣＰになるように設計されている。 In a file 1 as another embodiment of the present invention shown in FIG. 4, the needle portion 12 has an alternating contact point. In other words, a part of the cutting edge 120 extending in a spiral shape that is shifted by one pitch from a part that contacts the root canal wall (contact part CP) becomes a part that does not contact the root canal wall (non-contact part), and is separated from the non-contact part. The contact portion CP is designed so that the portion shifted by one pitch further becomes the contact portion CP.
　当該構成の根管治療用ファイルによれば、ファイル１が上下方向に往復動されることで根管壁が研削される際、カッティングエッジ１２０が接触部位ＣＰにおいて根管壁に食い込む前に当該接触部位ＣＰが接触圧から解放される。このため、ファイル１によるリーミングに際してカッティングエッジ１２０が根管壁に食い込んでファイルの回転が妨げられたり、カッティングエッジ１２０が破損したりする事態が回避されうる。 According to the file for root canal treatment having the above configuration, when the root canal wall is ground by reciprocating the file 1 in the vertical direction, the contact point is removed before the cutting edge 120 bites into the root canal wall at the contact area CP. Site CP is released from contact pressure. Therefore, it is possible to avoid a situation in which the cutting edge 120 digs into the root canal wall during reaming with the file 1, preventing rotation of the file or damaging the cutting edge 120.
　本発明は、Ｈファイルのみならず、リーマ、ＫファイルおよびＲＴファイルなど、さまざまな根管治療用ファイルに適用可能である。 The present invention is applicable not only to H files but also to various root canal treatment files such as reamers, K files, and RT files.
　本発明によれば、ファイル１が上方向に動かされた際にカッティングエッジ１２０が掻き上げ刃として機能して根管壁が研削されるのみならず、ファイル１が下方向に動かされた際にもランド１２１等に形成された凹凸構造Ｓ１等によって根管壁が研削される。これにより、根管治療の効率の向上が図られ、歯科医師および患者の負担の軽減が図られるので、本発明の産業上の利用価値は極めて高い。本発明は獣医療分野にも適用可能である。 According to the present invention, when the file 1 is moved upward, the cutting edge 120 not only functions as a scraping blade to grind the root canal wall, but also when the file 1 is moved downward. Also, the root canal wall is ground by the uneven structure S1 formed on the land 121 and the like. This improves the efficiency of root canal treatment and reduces the burden on dentists and patients, so the industrial value of the present invention is extremely high. The present invention is also applicable to the veterinary field.
　　１‥ファイル
　１０‥ハンドル
　１２‥針部
１２０‥カッティングエッジ
１２１‥ランド
１２２‥フルート
１２４‥ランド
　Ｓ１‥ヤスリ目
　Ｓ２‥サンドブラスト加工痕
　Ｓ３‥砥粒層。 1.File 10.Handle 12.Needle 120.Cutting edge 121.Land 122.Flute 124.Land S1.Sand grain S2.Sandblasting traces S3.Abrasive grain layer.

Claims (6)

  1. 　らせん状に延在するカッティングエッジおよびフルートを有する金属製の針部を備え、
    　前記針部の前記カッティングエッジを除く少なくとも一部が凹凸構造を有している
    根管治療用ファイル。     Equipped with a metal needle with a spirally extending cutting edge and a flute,
    A file for root canal treatment, wherein at least a portion of the needle portion other than the cutting edge has an uneven structure.
  2. 　請求項１に記載の根管治療用ファイルにおいて、
    　前記針部の前記カッティングエッジおよび前記フルートを除く部分の少なくとも一部が凹凸構造を有している
    根管治療用ファイル。     The root canal treatment file according to claim 1,
    A file for root canal treatment, wherein at least a portion of a portion of the needle portion excluding the cutting edge and the flute has an uneven structure.
  3. 　請求項２に記載の根管治療用ファイルにおいて、
    　前記針部のらせん状に延在する表側の凸曲面と前記フルートの画定面としての裏側の凹曲面とのそれぞれの上縁部に沿って前記カッティングエッジがらせん状に延在し、
    　前記凸曲面の少なくとも一部が前記凹凸構造を有している
    根管治療用ファイル。     The root canal treatment file according to claim 2,
    The cutting edge extends in a spiral along the upper edge of each of the convex curved surface on the front side that extends in a spiral manner of the needle part and the concave curved surface on the back side as a defining surface of the flute,
    A file for root canal treatment, wherein at least a part of the convex curved surface has the uneven structure.
  4. 　請求項１に記載の根管治療用ファイルにおいて、
    　前記凹凸構造が、ヤスリ目と、サンドブラスト加工痕と、砥粒および接着剤からなる砥粒層と、のうち少なくとも1つにより構成されている
    根管治療用ファイル。     The root canal treatment file according to claim 1,
    A file for root canal treatment, wherein the uneven structure is composed of at least one of file marks, sandblasting marks, and an abrasive grain layer made of abrasive grains and an adhesive.
  5. 　請求項１に記載の根管治療用ファイルにおいて、
    　前記針部の周方向に一定幅を有し、前記針部の外形に沿った円錐側面または円筒側面に沿ってらせん状に延在するランドの縁部により前記カッティングエッジが構成され、前記針部の横断面において前記カッティングエッジが鈍角に形成されている
    根管治療用ファイル。     The root canal treatment file according to claim 1,
    The cutting edge is constituted by an edge of a land that has a constant width in the circumferential direction of the needle and extends spirally along a conical side surface or a cylindrical side along the outer shape of the needle; A file for root canal treatment, wherein the cutting edge is formed at an obtuse angle in a cross section.
  6. 　請求項１に記載の根管治療用ファイルにおいて、
    　前記針部がオルタネーティングコンタクトポイントを備えている
    根管治療用ファイル。     The root canal treatment file according to claim 1,
    A file for root canal treatment, wherein the needle portion includes an alternating contact point.
PCT/JP2023/032927 2022-09-13 2023-09-08 Root canal treatment file WO2024058080A1 (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6365414U (en) * 1986-10-20 1988-04-30
JP2002526156A (en) * 1998-10-06 2002-08-20 タルサ デンタル プロダクツ インコーポレーテッド Torque reduction endodontic file
JP2021061993A (en) * 2019-10-11 2021-04-22 マニー株式会社 Dental file

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6365414U (en) * 1986-10-20 1988-04-30
JP2002526156A (en) * 1998-10-06 2002-08-20 タルサ デンタル プロダクツ インコーポレーテッド Torque reduction endodontic file
JP2021061993A (en) * 2019-10-11 2021-04-22 マニー株式会社 Dental file

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