JPWO2009107595A1 - Dental cutting tool - Google Patents

Dental cutting tool Download PDF

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JPWO2009107595A1
JPWO2009107595A1 JP2010500684A JP2010500684A JPWO2009107595A1 JP WO2009107595 A1 JPWO2009107595 A1 JP WO2009107595A1 JP 2010500684 A JP2010500684 A JP 2010500684A JP 2010500684 A JP2010500684 A JP 2010500684A JP WO2009107595 A1 JPWO2009107595 A1 JP WO2009107595A1
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cutting tool
connection surface
shank
dental cutting
blade
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JP5382463B2 (en
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睦紀 塩入
睦紀 塩入
一明 加藤
一明 加藤
金子　典夫
典夫 金子
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Mani Inc
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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
    • A61C3/00—Dental tools or instruments
    • A61C3/02—Tooth drilling or cutting instruments; Instruments acting like a sandblast machine
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
    • B23K20/22—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating taking account of the properties of the materials to be welded

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  • Health & Medical Sciences (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)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Dental Tools And Instruments Or Auxiliary Dental Instruments (AREA)
  • Pressure Welding/Diffusion-Bonding (AREA)

Abstract

【課題】 使用中に折れにくく、しかも、折れた場合でも容易に回収することができる歯科用切削具を提供する。【解決手段】 回転工具のチャック１５に把持される柱状のシャンク部１２と、該シャンク部から徐々に細径になるテーパー部１３と、該テーパー部の先端に形成され、前記シャンク部より細い最大径を有する刃部１１とを有する歯科用切削具１０において、前記テーパー部の前記刃部の最大径より大きい位置に接続面１３ｃを設け、前記刃部１１から前記接続面１３ｃまでの部分を超硬合金、サーメット又はセラミックで一体的に形成し、前記接続面１３ｃからシャンク部１２側をステンレス鋼、鋼鉄、チタン合金等の金属で形成し、両者を前記接続面で接続した。【選択図】 図１PROBLEM TO BE SOLVED: To provide a dental cutting tool that is not easily broken during use and can be easily recovered even when it is broken. SOLUTION: A columnar shank portion 12 held by a chuck 15 of a rotary tool, a taper portion 13 that gradually decreases in diameter from the shank portion, and a maximum that is formed at the tip of the taper portion and is thinner than the shank portion. In the dental cutting tool 10 having a blade portion 11 having a diameter, a connection surface 13c is provided at a position larger than the maximum diameter of the blade portion of the tapered portion, and the portion from the blade portion 11 to the connection surface 13c is exceeded. It was integrally formed of hard alloy, cermet or ceramic, and the shank portion 12 side from the connection surface 13c was formed of a metal such as stainless steel, steel, titanium alloy, etc., and both were connected by the connection surface. [Selection] Figure 1

Description

本発明は、歯科用切削具に関し、特に、超硬合金、サーメット又はセラミックで作成した刃部と、ステンレス鋼、鋼鉄又はチタン合金等の金属で形成したシャンク部とを接続したものに関する。   The present invention relates to a dental cutting tool, and more particularly to a dental cutting tool in which a blade portion made of cemented carbide, cermet or ceramic is connected to a shank portion formed of a metal such as stainless steel, steel or titanium alloy.

タングステンカーバイドを主成分とする超硬合金は、靱性があり、耐熱性に優れていることから、金属などの切削加工用の刃物として広く利用されている。また、歯科用の切削工具としても、タングステンカーバイドが使用されている。このような超硬合金を使用することによって、硬い硬度を持った歯牙でも容易に穴を明けることができる。また、タングステンカーバイドに代えてサーメットやセラミックを使用することも可能である。   Cemented carbides mainly composed of tungsten carbide are tough and excellent in heat resistance, and are therefore widely used as cutting tools for cutting metals and the like. Tungsten carbide is also used as a dental cutting tool. By using such a cemented carbide, it is possible to easily make a hole even with a hard tooth. Further, cermet or ceramic can be used instead of tungsten carbide.

しかし、タングステンカーバイドなどの超硬合金やサーメット、セラミックは、高価であり、シャンクの部分から先端の刃部までの全体を超硬合金等で作るソリッドタイプとすると、切削工具の原料代が嵩み、製造コストがアップする。また、ソリッドタイプとした場合、切削工具を把持するハンドピースのチャックを摩耗させ、傷めやすい、抜けやすい等といった問題があった。   However, cemented carbides such as tungsten carbide, cermets, and ceramics are expensive, and the raw material cost for cutting tools increases when the entire part from the shank to the tip blade is made of cemented carbide. , Manufacturing costs increase. Further, in the case of the solid type, there is a problem that the chuck of the handpiece that holds the cutting tool is worn and easily damaged and easily detached.

このような問題を解決するものとして、特許文献１では、図５に示すような歯科用切削具を提案している。   As a solution to such a problem, Patent Document 1 proposes a dental cutting tool as shown in FIG.

図５に示す歯科用切削具２０は、切削器具として歯に穴を明ける際に使用するものである。この図に示すように、歯科用切削具２０は、先端にシャンク部より細径の刃部２１を有し、他端側に円柱状のシャンク部２２を備え、両者の間にテーパー部２３を設け、テーパー部２３の先端面２３ａに刃部２１を接続したものである。刃部２１の部分のみを超硬合金で形成し、テーパー部２３とシャンク部２２とはステンレス鋼で一体のものとしている。すなわち、テーパー部２３の最も細い径の先端面２３ａで、ステンレス鋼と超硬合金とを接続している。   The dental cutting tool 20 shown in FIG. 5 is used when making a hole in a tooth as a cutting instrument. As shown in this figure, the dental cutting tool 20 has a blade portion 21 having a diameter smaller than that of the shank portion at the tip, a cylindrical shank portion 22 on the other end side, and a tapered portion 23 between the two. The blade portion 21 is connected to the tip end surface 23 a of the tapered portion 23. Only the blade portion 21 is made of cemented carbide, and the taper portion 23 and the shank portion 22 are made of stainless steel and integrated. That is, the stainless steel and the cemented carbide are connected at the tip end surface 23a having the narrowest diameter of the tapered portion 23.

上記の歯科用切削具２０は、シャンク部２２を、ハンドピースなどの回転器具のチャックで把持し、高速回転させて使用する。   The dental cutting tool 20 is used by gripping the shank portion 22 with a chuck of a rotary instrument such as a handpiece and rotating it at a high speed.

このような構成にすれば、超硬合金の使用量は最も少なくなり、製造コストを下げることができる。   With such a configuration, the amount of cemented carbide used is minimized, and the manufacturing cost can be reduced.

図５の従来例は、刃部２１の最大径がシャンク部２２の径より小さい場合であるが、図６の従来例は、刃部の径がシャンク部の径より大きい場合である。この図に示す歯科用切削具３０は、先端にシャンク部より太径の刃部３１を有し、他端側に円柱状のシャンク部３２を備え、両者の間にテーパー部３３を設け、テーパー部３３の先端面３３ａに刃部３１を接続している。
特開平６−１９９５８０号 The conventional example of FIG. 5 is a case where the maximum diameter of the blade portion 21 is smaller than the diameter of the shank portion 22, but the conventional example of FIG. 6 is a case where the diameter of the blade portion is larger than the diameter of the shank portion. The dental cutting tool 30 shown in this figure has a blade portion 31 having a diameter larger than that of the shank portion at the tip, a cylindrical shank portion 32 on the other end side, and a taper portion 33 provided between the two, and a taper. The blade portion 31 is connected to the tip surface 33 a of the portion 33.
JP-A-6-199580

しかしながら、図５や図６に記載の歯科用切削具は、テーパー部２３、３３の径が最小になる先端面２３ａ、３３ａが超硬合金とステンレス鋼との接続面となる構成なので、接続面積が小さくなり、接続強度が弱く、使用中に折れ易い。また、図５に示すような刃部の径がシャンク部の径より小さい場合は、使用中に折れると、刃部２１、３１が小さいので、見失い易く、探して拾うのが大変である。特に、歯科の場合は、刃部の側面を治療部位に押し当てて使用することが多いため、工業用のドリル等と違って、接続面に負担が掛かる構造となっており、折れ易いという問題があった。   However, the dental cutting tool shown in FIGS. 5 and 6 has a configuration in which the tip surfaces 23a and 33a in which the diameters of the tapered portions 23 and 33 are the minimum are the connection surfaces of the cemented carbide and the stainless steel. Becomes smaller, connection strength is weak, and it is easy to break during use. In addition, when the diameter of the blade portion as shown in FIG. 5 is smaller than the diameter of the shank portion, if the blade portion is broken during use, the blade portions 21 and 31 are small, so that they are easily lost and difficult to find and pick up. In particular, in the case of dentistry, the side of the blade is often pressed against the treatment site, so unlike the industrial drills, etc., it has a structure that places a burden on the connection surface and is easy to break. was there.

本発明は、斯かる実情に鑑みてなされたもので、使用中に折れにくく、しかも、折れた場合でも容易に回収することができる歯科用切削具を提供しようとするものである。   The present invention has been made in view of such circumstances, and an object of the present invention is to provide a dental cutting tool that is not easily broken during use and can be easily recovered even when it is broken.

上記の目的を達成するために本発明の歯科用切削具は、回転工具のチャックに把持されるストレートな柱状のシャンク部と、該シャンク部から徐々に細径になるテーパー部と、該テーパー部の先端に形成された刃部とを有する歯科用切削具において、前記テーパー部内の任意の位置から前記刃部の先端までの間において径が最大となる位置付近に接続面を設け、前記刃部から前記接続面までの部分を超硬合金、サーメット又はセラミックで一体的に形成し、前記接続面から前記シャンク部側を金属で一体的に形成し、両者を前記接続面で接続したことを特徴としている。   In order to achieve the above object, a dental cutting tool of the present invention includes a straight columnar shank portion that is gripped by a chuck of a rotary tool, a tapered portion that gradually decreases in diameter from the shank portion, and the tapered portion. In the dental cutting tool having a blade portion formed at the tip of the blade, a connection surface is provided in the vicinity of a position where the diameter is maximum between an arbitrary position in the taper portion and the tip of the blade portion, and the blade portion. To the connecting surface is integrally formed of cemented carbide, cermet or ceramic, the shank portion side is integrally formed of metal from the connecting surface, and both are connected by the connecting surface. It is said.

前記シャンク部側の金属がファイバー状のオーステナイト系ステンレス鋼からなり、前記接続面で接続した接続部のシャンク部側がファイバー状でないオーステナイト組織からなっている構成としたり、刃部の側面を治療部位に押し当てて使用することが可能である構成としたり、前記刃部の最大径が、前記シャンク部の径より小さく、前記接続面が、前記テーパー部に設けられた構成としたり、前記刃部の最大径が、前記シャンク部の径より大きく、前記接続面が、前記刃部に設けられた構成としたり、前記接続面における金属と超硬合金、サーメット又はセラミックとの接続が、摩擦圧接による構成としてもよい。   The metal on the shank part side is made of fiber-like austenitic stainless steel, and the shank part side of the connection part connected at the connection surface is made of an austenite structure that is not fiber-like, or the side of the blade part is used as a treatment site It can be configured to be used by pressing, or the maximum diameter of the blade portion is smaller than the diameter of the shank portion, and the connection surface is provided in the tapered portion, The maximum diameter is larger than the diameter of the shank portion, and the connection surface is provided on the blade portion, or the connection between the metal and the cemented carbide, cermet or ceramic on the connection surface is based on friction welding. It is good.

本発明の歯科用切削具は、シャンク部は超硬合金やサーメット、セラミックなどに比べて安価なステンレス鋼、鋼鉄、チタン合金などの金属を使用するので、全体に安価に製造できる。また、接続面がテーパー部の途中の位置から刃部の先端までで最も径の太い部分なので、接続面積が大きくなって折れにくくなる。刃部の側面を治療部位に押し当てて使用する場合にも折れにくく、安全に使用することができる。また、刃部の最大径が、前記シャンク部の径より小さい場合に、使用中に接続部で折れた場合も、テーパー部の一部が一体になっているので、大きくなり、見つけ易く、回収が容易にできる。また、シャンク側にもテーパー部の一部が残っているので、回転工具のチャックから取外しやすい、等の効果を奏する。前記金属と超硬合金、サーメット又はセラミックとの接続が、摩擦圧接による構成によって、接続加工を効率的に行うことができる。前記金属を、長手方向に沿って伸長したファイバー状のオーステナイト系ステンレス鋼で構成したことによって、耐錆性、曲げ強度を向上させると共に、全長にわたってバラツキのない均一な強度を発揮させることが可能である。また、接続部のシャンク部側が、ファイバー状でないオーステナイト組織からなっていることにより、接合面からの破断が発生しにくくなる。   Since the shank portion uses a metal such as stainless steel, steel, or titanium alloy, which is less expensive than cemented carbide, cermet, ceramic, etc., the dental cutting tool of the present invention can be manufactured at a low cost as a whole. In addition, since the connecting surface is the thickest part from the midway position of the tapered portion to the tip of the blade portion, the connecting area becomes large and it is difficult to break. Even when the side surface of the blade portion is pressed against the treatment site, it is difficult to break and can be used safely. In addition, when the maximum diameter of the blade part is smaller than the diameter of the shank part, even if it breaks at the connection part during use, the taper part is partly integrated, so it is large, easy to find, and recovered Can be easily done. Moreover, since a part of taper part remains also on the shank side, there exist effects, such as being easy to remove from the chuck | zipper of a rotary tool. The connection between the metal and the cemented carbide, cermet, or ceramic can be efficiently performed by the configuration by friction welding. By configuring the metal with fiber-like austenitic stainless steel elongated along the longitudinal direction, it is possible to improve rust resistance and bending strength, and to exhibit uniform strength without variation over the entire length. is there. Moreover, since the shank part side of the connection part is made of an austenite structure that is not in the form of fibers, breakage from the joint surface is less likely to occur.

以下、本発明の実施の形態を添付図面を参照して説明する。   Embodiments of the present invention will be described below with reference to the accompanying drawings.

図１は、本発明の歯科用切削具の図で、従来例と同じ歯科用の切削器具である。同図に示すように、歯科用切削具１０は、先端に細径の刃部１１を有し、基端側にストレート円柱状のシャンク部１２を備え、両者の間をテーパー状のテーパー部１３で接続している。   FIG. 1 is a diagram of a dental cutting tool according to the present invention, which is the same dental cutting instrument as that of a conventional example. As shown in the figure, the dental cutting tool 10 has a thin blade portion 11 at the distal end, a straight cylindrical shank portion 12 on the proximal end side, and a tapered portion 13 having a tapered shape therebetween. Connected with.

テーパー部１３は、従来例とおなじ形状ではあるが、テーパー部１３の途中でシャンク部１２側のテーパー部１３ａと、刃部１１側のテーパー部１３ｂとに分かれている。そして、両テーパー部１３ａと１３ｂとは、接続面１３ｃで接続される。   The tapered portion 13 has the same shape as the conventional example, but is divided into a tapered portion 13 a on the shank portion 12 side and a tapered portion 13 b on the blade portion 11 side in the middle of the tapered portion 13. And both the taper parts 13a and 13b are connected by the connection surface 13c.

シャンク部１２側のテーパー部１３ａは、シャンク部１２とおなじステンレス鋼、鋼鉄、チタン合金等の金属で一体形成されている。一方、刃部１１側のテーパー部１３ｂは、超硬合金、サーメット又はセラミックで、刃部１１と一体に形成されている。   The tapered portion 13a on the shank portion 12 side is integrally formed of a metal such as stainless steel, steel, titanium alloy or the like, which is the same as the shank portion 12. On the other hand, the taper portion 13b on the blade portion 11 side is made of cemented carbide, cermet or ceramic and is formed integrally with the blade portion 11.

刃部１１の最大径をｄとしたとき、接続面１３ｃの径Ｄは、Ｄ＞ｄの関係となっている。また、接続面１３ｃは、シャンク部１２ではなく、テーパー部１３に形成されるようになっている。   When the maximum diameter of the blade portion 11 is d, the diameter D of the connection surface 13c has a relationship of D> d. Further, the connection surface 13 c is formed not on the shank portion 12 but on the tapered portion 13.

テーパー部１３ａと１３ｂとの接続方法としては、たとえば、特許文献１に記載されたように、低酸素雰囲気中でステンレス鋼、鋼鉄、チタン合金などの金属を加熱して半溶融状態にし、テーパー部１３ａと１３ｂを圧接することで、接続することができる。この場合、接続面１３ｃは、平面にする必要はなく、補完し合う形状であれば、凹凸があってもよい。   As a method for connecting the tapered portions 13a and 13b, for example, as described in Patent Document 1, a metal such as stainless steel, steel, titanium alloy, etc. is heated to a semi-molten state in a low oxygen atmosphere, and the tapered portion is formed. It can connect by pressing 13a and 13b. In this case, the connection surface 13c does not need to be a flat surface, and may have irregularities as long as the shapes complement each other.

あるいは、大気中で、シャンク部１２と刃部１１をテーパー部１３ａと１３ｂが重なるようにして圧接し、シャンク部１２と刃部１１のいずれか一方もしくは両方を回転させて、摩擦熱によりステンレス鋼等の金属を半溶融状態にして圧接接続する方法もある。この場合、接続面１３ｃは、平滑な面にしなければならないが、平面に限定されず、補完し合う形状であれば、凹面と凸面の組合せとしてもよい。さらには、ロウ付けにより接続してもよい。   Alternatively, in the atmosphere, the shank portion 12 and the blade portion 11 are pressed together so that the tapered portions 13a and 13b overlap, and either one or both of the shank portion 12 and the blade portion 11 are rotated, and the stainless steel is generated by frictional heat. There is also a method in which a metal such as a metal is in a semi-molten state and press-contacted. In this case, the connection surface 13c must be a smooth surface, but is not limited to a flat surface, and may be a combination of a concave surface and a convex surface as long as the shapes complement each other. Further, it may be connected by brazing.

接続面の大きさを大きくするには、シャンク部１２で接続すればよいのであるが、本発明では、シャンク部以外の部分で接続している。この理由を以下に説明する。   In order to increase the size of the connection surface, it is only necessary to connect at the shank portion 12, but in the present invention, the connection is made at a portion other than the shank portion. The reason for this will be described below.

図２は、シャンク部１２で接続した歯科用切削具が回転工具のチャックに把持された状態を示す図で、（ａ）は、チャックで把持された状態を示す図、（ｂ）は接続面で折損した状態を示す図である。   2A and 2B are views showing a state where the dental cutting tool connected by the shank portion 12 is held by the chuck of the rotary tool. FIG. 2A is a view showing a state where the dental cutting tool is held by the chuck, and FIG. It is a figure which shows the state broken by.

図２（ａ）に示すようにシャンク部１２の接続面１２ａで接続すると、接続面１２ａから刃部１１側は超硬合金、サーメット又はセラミックで一体に形成されることになる。この場合、接続面１２ａの面積が大きいので接続力は大きくなる。しかし、チャック１５の先端に超硬合金、サーメット又はセラミックが当接することになり、チャック１５の先端部分を損傷する可能性がある。   As shown in FIG. 2A, when the connection surface 12a of the shank portion 12 is connected, the blade portion 11 side from the connection surface 12a is integrally formed of cemented carbide, cermet or ceramic. In this case, since the area of the connection surface 12a is large, the connection force is increased. However, cemented carbide, cermet, or ceramic comes into contact with the tip of the chuck 15, which may damage the tip of the chuck 15.

また、接続面１２ａで折損すると、図２（ｂ）に示すように、シャンク部１２がチャック１５の内部に入っているので、取り出しにくくなる。   Further, if the connection surface 12a breaks, the shank portion 12 is inside the chuck 15 as shown in FIG.

図３は、本発明の場合で、テーパー部で接続した図で、（ａ）はチャックで把持された状態を示す図、（ｂ）は接続面で折損した状態を示す図である。   FIGS. 3A and 3B are diagrams in which the taper portion is connected in the case of the present invention, where FIG. 3A is a diagram illustrating a state of being gripped by a chuck, and FIG. 3B is a diagram illustrating a state of being broken at a connection surface.

（ａ）に示すように、シャンク部１２とテーパー部１３ａまではすべてステンレス鋼などの金属製なので、チャック１５は超硬合金と接触することがなく、損傷を受けることがない。接続面１３ｃで折損した場合、（ｂ）に示すように、折損した先端部であるテーパー部１３ａは、必ずチャック１５の外に突出している。したがって、このテーパー部１３ａを掴んで引き出せば、簡単に取り出すことができる。   As shown to (a), since the shank part 12 and the taper part 13a are all made of metal such as stainless steel, the chuck 15 does not come into contact with the cemented carbide and is not damaged. When the connection surface 13c is broken, the tapered portion 13a, which is the broken tip portion, always protrudes from the chuck 15, as shown in FIG. Therefore, if this taper part 13a is grasped and pulled out, it can be easily taken out.

図４は、本発明の歯科用切削具の第２実施例である。この実施例は、刃部３１の最大径が、シャンク部３２の径より大きい場合の例である。ここでは、刃部３１の最大径のところに接続面３１ａを形成している。そして、接続面３１ａからシャンク部３２側を金属製の一体構造とし、接続面３１ａから刃部３１側を超硬金属、サーメット又はセラミックで一体的に作成している。このような構成にすることで、大きな接続面積を確保することができ、接続強度を向上させることができる。尚、接続面は必ずしも最大径のところに形成しなくても良く、最大径付近の位置であれば良い。特に第２実施例においては、刃部の最下端より約１／４以内の位置に形成することが望ましい。また、シャンク部３２側を長手方向に沿って伸長したファイバー状のオーステナイト系ステンレス鋼で構成したことによって、耐錆性、曲げ強度を向上させると共に、全長にわたってバラツキのない均一な強度を発揮させることが可能である。   FIG. 4 shows a second embodiment of the dental cutting tool of the present invention. In this embodiment, the maximum diameter of the blade part 31 is larger than the diameter of the shank part 32. Here, the connection surface 31 a is formed at the maximum diameter of the blade portion 31. And the shank part 32 side from the connection surface 31a is made into an integral structure made of metal, and the blade part 31 side from the connection surface 31a is integrally made of cemented carbide, cermet or ceramic. With such a configuration, a large connection area can be secured, and the connection strength can be improved. Note that the connection surface does not necessarily have to be formed at the maximum diameter, and may be a position near the maximum diameter. In particular, in the second embodiment, it is desirable to form at a position within about ¼ from the lowest end of the blade portion. Moreover, by forming the shank portion 32 side with a fiber-like austenitic stainless steel extending along the longitudinal direction, the rust resistance and the bending strength are improved, and a uniform strength without variation over the entire length is exhibited. Is possible.

本発明の歯科用切削具の図である。It is a figure of the dental cutting tool of this invention. シャンク部で接続した歯科用切削具が回転工具のチャックに把持された状態を示す図で、（ａ）は、チャックで把持された状態を示す図、（ｂ）は接続面で折損した状態を示す図である。It is a figure which shows the state by which the dental cutting tool connected by the shank part was hold | gripped by the chuck | zipper of a rotary tool, (a) is a figure which shows the state hold | gripped with a chuck | zipper, (b) is the state broken by the connection surface. FIG. 本発明のテーパー部で接続した図で、（ａ）はチャックで把持された状態を示す図、（ｂ）は接続面で折損した状態を示す図である。It is the figure connected by the taper part of this invention, (a) is a figure which shows the state hold | gripped with the chuck | zipper, (b) is a figure which shows the state broken by the connection surface. 本発明の歯科用切削具の第２実施例を示す図である。It is a figure which shows 2nd Example of the dental cutting tool of this invention. 従来の歯科用切削具の構成を示す図である。It is a figure which shows the structure of the conventional dental cutting tool. 従来の別の歯科用切削具の構成を示す図である。It is a figure which shows the structure of another conventional dental cutting tool.

符号の説明Explanation of symbols

１０、３０ 歯科用切削具
１１、３１ 刃部
１２、３２ シャンク部
１３、３３ テーパー部
１３ａ （シャンク側）テーパー部
１３ｂ （刃部側）テーパー部
１３ｃ、３１ａ 接続面
１５ チャック10, 30 Dental cutting tool 11, 31 Blade part 12, 32 Shank part 13, 33 Taper part 13a (shank side) Taper part 13b (blade part side) taper part 13c, 31a Connection surface 15 Chuck

Claims (3)

回転工具のチャックに把持されるストレートな柱状のシャンク部と、該シャンク部から徐々に細径になるテーパー部と、該テーパー部の先端に形成された刃部とを有する歯科用切削具において、前記テーパー部内の任意の位置から前記刃部の先端までの間において径が最大となる位置付近に接続面を設け、前記刃部から前記接続面までの部分を超硬合金、サーメット又はセラミックで一体的に形成し、前記接続面から前記シャンク部側を金属で一体的に形成し、両者を前記接続面で接続したことを特徴とする歯科用切削具。   In a dental cutting tool having a straight column-shaped shank portion gripped by a chuck of a rotary tool, a tapered portion that gradually decreases in diameter from the shank portion, and a blade portion formed at the tip of the tapered portion, A connection surface is provided in the vicinity of the position where the diameter is maximum between an arbitrary position in the taper portion and the tip of the blade portion, and the portion from the blade portion to the connection surface is integrally formed of cemented carbide, cermet, or ceramic. The dental cutting tool is characterized in that the shank portion side is integrally formed of metal from the connection surface, and both are connected by the connection surface. 前記シャンク部側の金属が、長手方向に沿って伸長したファイバー状のオーステナイト系ステンレス鋼からなり、前記接続面で接続した接続部のシャンク部側がファイバー状でないオーステナイト組織からなっていることを特徴とする請求項１の歯科用切削具。   The metal on the shank part side is made of a fiber-like austenitic stainless steel extending along the longitudinal direction, and the shank part side of the connection part connected at the connection surface is made of an austenite structure that is not fiber-like. The dental cutting tool according to claim 1. 前記歯科用切削具は、刃部の側面を治療部位に押し当てて使用することが可能であることを特徴とする請求項１または２に記載の歯科用切削具。   The dental cutting tool according to claim 1 or 2, wherein the dental cutting tool can be used by pressing a side surface of a blade portion against a treatment site.
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