WO2017111079A1 - Dental root canal cutting tool - Google Patents
Dental root canal cutting tool Download PDFInfo
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- WO2017111079A1 WO2017111079A1 PCT/JP2016/088483 JP2016088483W WO2017111079A1 WO 2017111079 A1 WO2017111079 A1 WO 2017111079A1 JP 2016088483 W JP2016088483 W JP 2016088483W WO 2017111079 A1 WO2017111079 A1 WO 2017111079A1
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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
Definitions
- the present invention relates to a dental root canal cutting tool used for enlarging and cleaning a root canal in dental treatment.
- reamers and files as dental root canal cutting tools used for root canal enlargement and cleaning in dental treatment (see Patent Document 1).
- the reamer mainly cuts the root canal by rotating, and the file cuts the root canal by rotating or pushing and pulling in the axial direction.
- Conventional dental root canal cutting tools are made of stainless steel, but in recent years, highly flexible nickel titanium suitable for treatment of curved root canals may be used. Furthermore, not only a manual type but also an electric type used as a power connected to a dental handpiece (engine) is increasing. And, it is possible to perform treatment quickly by using an electric type.
- FIG. 4 is a perspective view of a dental root canal cutting tool.
- the dental root canal cutting tool 100 shown here is a file used by being connected to a dental handpiece.
- This dental root canal cutting tool 100 includes a working part 101 formed of a cutting blade having a spiral shape that narrows toward the tip, a shaft 102 connected to the rear end of the working part 101, and a rear part of the shaft 102. And a grip portion 103 connected to the end and attached to the dental handpiece.
- a general manufacturing method of such a dental root canal cutting tool is to first process a portion that becomes a working portion from a thin wire rod so as to have a constant taper ratio (for example, 2/100) by a centerless processing machine. Then, a groove to be a cutting edge of the working part is formed by a blade groove grinding machine.
- a method of grinding a thin wire in two stages of taper formation and cutting edge formation is employed. In the case of a nickel titanium file, it is preferable to form a thin wire since it is easy to damage the grindstone.
- the length of the working part can be increased, but if it is formed from a thin wire, there is a disadvantage that the length of the working part cannot be increased. That is, even if it connects with a dental handpiece and tries to cut the inside of the root canal quickly, it has a problem that it is difficult to smoothly discharge the cut material from the root canal because the length of the working part is short. .
- the present invention is a dental root canal cutting tool which is used by being attached to a dental handpiece, and can smoothly discharge a cut material generated by cutting the inside of the root canal.
- the purpose is to provide.
- the dental root canal cutting tool includes a working part having a spiral cutting edge and being narrowed toward the tip, and a circumscribed circle of the rear end section of the working part connected to the rear end of the working part.
- the spiral pitch of the spiral groove is larger than the spiral shape of the cutting edge of the working portion, or the groove width is larger than the spiral shape of the cutting edge of the working portion.
- the edge of the spiral groove may have a function as a cutting edge or may not have a function.
- the working portion is formed of a spiral cutting blade and is narrowed toward the tip, a shaft connected to the rear end of the working portion, and a grip connected to the dental handpiece connected to the rear end of the shaft.
- a tapered portion that is tapered toward the rear end of the working portion, and a straight portion that is continuous with the rear end of the tapered portion and has the same diameter as the thickest portion of the tapered portion.
- the dental root canal cutting tool may be characterized in that the diameter of the finest portion of the tapered portion is smaller than the diameter of the circumscribed circle of the rear end cross section of the working portion.
- the shaft by providing the shaft with a spiral groove or a tapered portion, it is possible to smoothly discharge the cut material cut by the working portion to the outside of the root canal.
- a dental root canal cutting tool which has a helical groove
- It is a figure which shows the rear end cross section of a working part Comprising: (a) is a case where a working part cross section is a triangle, (b) is a case where the working part cross section is a shape which cut off a part of circle. It is a perspective view of a dental root canal cutting tool.
- the present invention is a dental root canal cutting tool in which a shaft is added with a function of improving the discharge of a cut material.
- FIG. 1 shows a dental root canal cutting tool having a spiral groove on a shaft, where (a) is a perspective view and (b) is an enlarged plan view of the shaft.
- the dental root canal cutting tool 10 includes a working portion 11 having a spiral cutting edge and narrowing toward the tip, and a circumscribing section of the rear end of the working portion 11 connected to the rear end of the working portion 11.
- the shaft 12 has the same diameter as the circle, and the grip 13 connected to a dental handpiece (not shown) connected to the rear end of the shaft 12. That is, it is a dental root canal cutting tool 10 used by being connected to a dental handpiece, and corresponds to a file made of stainless steel or nickel titanium.
- the shaft 12 is formed with a spiral groove 12a continuous from the cutting edge of the working unit 11.
- the spiral groove 12a has a spiral pitch larger than that of the cutting blade spiral or a groove width larger than that of the cutting blade spiral, thereby further improving the discharge performance of the cut object. be able to.
- a detailed shape such as the length of the spiral groove 12a, it is necessary to consider the balance between the dischargeability of the cut material and the breaking strength of the dental root canal treatment instrument 10.
- FIG. 2 shows a dental root canal cutting tool having a tapered portion on the shaft, where (a) is a perspective view and (b) is an enlarged plan view of the shaft. Note that if the shank 22 is not provided with the taper portion 22a and the overall length of the shank 22 is made thin, it is possible to improve the discharge performance of the cut material, but the breaking strength of the dental root canal cutting tool 20 is weakened. The breaking strength is secured by setting 22a.
- This dental root canal cutting tool 20 is similar to the one shown in FIG. 1, and has a working portion 21 having a spiral cutting edge and narrowing toward the tip, and a rear end of the working portion 21. It has a continuous shaft 22 and a grip 23 connected to a dental handpiece (not shown) connected to the rear end of the shaft 22.
- the shaft 22 includes a tapered portion 22a that narrows toward the rear end of the working portion 21, and a straight portion 22b that is continuous with the rear end of the tapered portion 22a and has the same diameter as the thickest portion of the tapered portion 22a. It consists of.
- FIGS. 3A and 3B are diagrams showing a rear end cross section of the working unit, where FIG. 3A shows a case where the working unit cross section is a triangle, and FIG. 3B shows a case where the working unit cross section is a part of a circular shape.
- the shape of the rear end 21a of the working unit 21 is merely an example, and is not limited to these two types.
- the rear end 21a of the working part 21 is the thickest part of the working part 21.
- the circumscribed circle 21c is a circle circumscribing the cross section of the rear end 21a of the working unit 21, and is indicated by a two-dot chain line in the drawing. That is, when the cross-sectional shape of the rear end 21a of the working unit 21 is a polygon such as a triangle as shown in FIG. 3A, the circumscribed circle 21c is a circle in which each vertex of the polygon passes on the circumference. .
- the cross-sectional shape is a shape in which a part of a circle is cut out to form a cutting blade as shown in FIG. 3B, a circle in which the cut-out part is virtually filled is circumscribed. Think of it as 21c.
- the most detailed diameter 22a1 of the tapered portion 22a is as shown by a broken line when the cross section of the rear end 21a of the working portion is polygonal as shown in FIG. It is considered that the diameter should be about the inscribed circle of the polygon or less.
- the cross section of the rear end 21a of the working portion 21 is a shape obtained by cutting a part of a circle as shown in FIG. 3B
- the cut portion as shown by the broken line in FIG. It is good to make it the diameter which touches the position of the bottom of this, or the diameter below it. This is because, with such a shape, the cut material that has passed through the spiral cutting blade can smoothly enter the tapered portion 22a and be discharged.
- the most detailed diameter 22a1 of the tapered portion 22a is smaller than the circumscribed circle 21c of the rear end 21a of the working portion, and if possible, the diameter is about the inscribed circle of the rear end 21a of the working portion. Is good. However, when the finest diameter 22a1 is small, the breaking strength as a dental root canal cutting tool becomes weak, so a design that takes into account the balance between strength and dischargeability is required.
- the spiral groove and the tapered portion are provided in the shank to enhance the discharge of the cut material. Therefore, the object to be attached to the dental handpiece is basically targeted. This is because, in the case of a type in which a handle is provided and moved by hand, the amount of discharge of the cut material is not so large, and even if a spiral groove or a tapered portion is provided, the effect of promoting discharge is small. However, even in the case of manual operation, since the cut object is discharged, there is no problem even if a spiral groove or a tapered portion similar to the present invention is provided.
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Abstract
Provided is a dental root canal cutting tool which is attached to a dental handpiece when in use, and with which cut material produced as a result of cutting inside a root canal can be smoothly ejected. The dental root canal cutting tool (10) comprises: a work portion (11) comprising a spiral cutting blade and having a shape tapering toward the tip; a shaft (12) continuous with a rear end of the work portion (11) and having the same diameter as the circumscribed circle of a rear end cross section of the work portion; and a grip portion (13) continuous with the rear end of the shaft (12) and connected to the dental handpiece, wherein a spiral groove (12a) which is continuous from the cutting blade of the work portion is formed in the shaft (12) .
Description
本発明は、歯科治療において根管の拡大・清掃に用いられる歯科用根管切削具に関するものである。
The present invention relates to a dental root canal cutting tool used for enlarging and cleaning a root canal in dental treatment.
歯科治療において根管拡大や清掃に用いられる歯科用根管切削具としては、リーマやファイルがある（特許文献１参照）。リーマは主に回転させることで根管内を切削し、ファイルは回転させたり軸方向に押し引きしたりして根管内の切削をするものである。
There are reamers and files as dental root canal cutting tools used for root canal enlargement and cleaning in dental treatment (see Patent Document 1). The reamer mainly cuts the root canal by rotating, and the file cuts the root canal by rotating or pushing and pulling in the axial direction.
従来の歯科用根管切削具はステンレス製であったが、近年は湾曲した根管の治療に適した弾力性の高いニッケルチタンが用いられることがある。更に、動力としては手動式だけでなく、歯科用ハンドピース（エンジン）に接続して用いられる電動式も増えている。そして、電動式にすることで、治療を迅速に行うことを可能としている。
Conventional dental root canal cutting tools are made of stainless steel, but in recent years, highly flexible nickel titanium suitable for treatment of curved root canals may be used. Furthermore, not only a manual type but also an electric type used as a power connected to a dental handpiece (engine) is increasing. And, it is possible to perform treatment quickly by using an electric type.
図４は、歯科用根管切削具の斜視図である。ここに示した歯科用根管切削具１００は、歯科用ハンドピースに接続して用いられるファイルである。この歯科用根管切削具１００は、螺旋状で先端に向かって細くなっている形状の切刃からなる作業部１０１と、その作業部１０１の後端に連なるシャフト１０２と、そのシャフト１０２の後端に連なり歯科用ハンドピースに取り付けられる把持部１０３と、を有している。
FIG. 4 is a perspective view of a dental root canal cutting tool. The dental root canal cutting tool 100 shown here is a file used by being connected to a dental handpiece. This dental root canal cutting tool 100 includes a working part 101 formed of a cutting blade having a spiral shape that narrows toward the tip, a shaft 102 connected to the rear end of the working part 101, and a rear part of the shaft 102. And a grip portion 103 connected to the end and attached to the dental handpiece.
このような歯科用根管切削具の一般的な製造方法は、まず、細い線材から作業部になる部分をセンターレス加工機により一定のテーパー率（例えば、２／１００等）になるように加工し、その後、刃溝研削機により作業部の切刃になる溝を形成する。ここで、太い線材から加工すれば、作業部になる部分のテーパーと、切刃になる溝とを同時に形成することが技術的には可能であるが、研削量が多く砥石を傷めやすいことから、細い線材からテーパー形成と切刃形成の２段階に研削するという方法を採用することが多い。ニッケルチタンファイルの場合は、特に砥石を傷めやすいので、細い線材から形成するのがよい。
A general manufacturing method of such a dental root canal cutting tool is to first process a portion that becomes a working portion from a thin wire rod so as to have a constant taper ratio (for example, 2/100) by a centerless processing machine. Then, a groove to be a cutting edge of the working part is formed by a blade groove grinding machine. Here, if it is processed from a thick wire, it is technically possible to simultaneously form the taper of the part that becomes the working part and the groove that becomes the cutting edge, but the grinding amount is large and the grindstone is easily damaged. In many cases, a method of grinding a thin wire in two stages of taper formation and cutting edge formation is employed. In the case of a nickel titanium file, it is preferable to form a thin wire since it is easy to damage the grindstone.
太い線材から形成する場合であれば、作業部の長さを長くできるという利点があるのだが、細い線材から形成する場合は、作業部の長さを長くできないという不利益がある。つまり、歯科用ハンドピースに接続して迅速に根管内を切削しようとしても、作業部の長さが短いので、切削物を根管から円滑に排出することが難しいという問題を有することになる。
If it is formed from a thick wire, there is an advantage that the length of the working part can be increased, but if it is formed from a thin wire, there is a disadvantage that the length of the working part cannot be increased. That is, even if it connects with a dental handpiece and tries to cut the inside of the root canal quickly, it has a problem that it is difficult to smoothly discharge the cut material from the root canal because the length of the working part is short. .
斯かる事情に鑑み、本発明は、歯科用ハンドピースに取り付けて使用する歯科用根管切削具であって、根管内を切削して生じた切削物の排出を円滑に行うことができるものを提供することを目的とする。
In view of such circumstances, the present invention is a dental root canal cutting tool which is used by being attached to a dental handpiece, and can smoothly discharge a cut material generated by cutting the inside of the root canal. The purpose is to provide.
本発明に係る歯科用根管切削具は、螺旋状の切刃からなり先端に向かって細くなっている形状の作業部と、その作業部の後端に連なり作業部の後端断面の外接円と同一径のシャフトと、そのシャフトの後端に連なり歯科用ハンドピースに接続される把持部と、を有し、前記シャフトに作業部の切刃から連続する螺旋溝が形成されていることを特徴とするものである。
The dental root canal cutting tool according to the present invention includes a working part having a spiral cutting edge and being narrowed toward the tip, and a circumscribed circle of the rear end section of the working part connected to the rear end of the working part. A shaft having the same diameter and a grip portion connected to the dental handpiece connected to the rear end of the shaft, and a spiral groove continuous from the cutting edge of the working portion is formed on the shaft. It is a feature.
ここで、螺旋溝は、作業部の切刃の螺旋状よりも螺旋ピッチが大きいことにしたり、作業部の切刃の螺旋状よりも溝幅が大きいことにしたりするとよい。また、螺旋溝のエッジは切刃としての機能を有することとしても良いし、有さないこととしても良い。
Here, it is preferable that the spiral pitch of the spiral groove is larger than the spiral shape of the cutting edge of the working portion, or the groove width is larger than the spiral shape of the cutting edge of the working portion. Further, the edge of the spiral groove may have a function as a cutting edge or may not have a function.
また、螺旋状の切刃からなり先端に向かって細くなっている形状の作業部と、その作業部の後端に連なるシャフトと、そのシャフトの後端に連なり歯科用ハンドピースに接続される把持部と、を有し、前記シャフトが、作業部の後端に向かって細くなっているテーパー部と、そのテーパー部の後端に連なりテーパー部の最太部の径と同一径のストレート部と、からなり、テーパー部の最細部の径が作業部の後端断面の外接円の径よりも小さいことを特徴とする歯科用根管切削具としてもよい。
In addition, the working portion is formed of a spiral cutting blade and is narrowed toward the tip, a shaft connected to the rear end of the working portion, and a grip connected to the dental handpiece connected to the rear end of the shaft. A tapered portion that is tapered toward the rear end of the working portion, and a straight portion that is continuous with the rear end of the tapered portion and has the same diameter as the thickest portion of the tapered portion. The dental root canal cutting tool may be characterized in that the diameter of the finest portion of the tapered portion is smaller than the diameter of the circumscribed circle of the rear end cross section of the working portion.
本発明によれば、シャフトに螺旋溝やテーパー部を設けることで、作業部が切削した切削物を根管の外へ円滑に排出することができるという効果を奏する。
According to the present invention, by providing the shaft with a spiral groove or a tapered portion, it is possible to smoothly discharge the cut material cut by the working portion to the outside of the root canal.
本発明は、シャフトに切削物の排出性を向上させる機能を付加した歯科用根管切削具である。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。
DETAILED DESCRIPTION OF THE INVENTION The present invention is a dental root canal cutting tool in which a shaft is added with a function of improving the discharge of a cut material. Embodiments of the present invention will be described below with reference to the accompanying drawings.
図１は、シャフトに螺旋溝を有する歯科用根管切削具であって、（ａ）斜視図、（ｂ）はシャフトの拡大平面図である。
FIG. 1 shows a dental root canal cutting tool having a spiral groove on a shaft, where (a) is a perspective view and (b) is an enlarged plan view of the shaft.
この歯科用根管切削具１０は、螺旋状の切刃からなり先端に向かって細くなっている形状の作業部１１と、その作業部１１の後端に連なり作業部１１の後端断面の外接円と同一径のシャフト１２と、そのシャフト１２の後端に連なり図示しない歯科用ハンドピースに接続される把持部１３と、を有するものである。つまり、歯科用ハンドピースに接続して使用される歯科用根管切削具１０であって、ステンレス鋼製やニッケルチタン製等のファイルが該当する。
The dental root canal cutting tool 10 includes a working portion 11 having a spiral cutting edge and narrowing toward the tip, and a circumscribing section of the rear end of the working portion 11 connected to the rear end of the working portion 11. The shaft 12 has the same diameter as the circle, and the grip 13 connected to a dental handpiece (not shown) connected to the rear end of the shaft 12. That is, it is a dental root canal cutting tool 10 used by being connected to a dental handpiece, and corresponds to a file made of stainless steel or nickel titanium.
ここで、シャフト１２には、作業部１１の切刃から連続する螺旋溝１２ａが形成されている。なお、その螺旋溝１２ａは、切刃の螺旋状よりも螺旋ピッチが大きいことにしたり、切刃の螺旋状よりも溝幅が大きいことにしたりすることで、切削物の排出性をさらに向上させることができる。ただし、螺旋溝１２ａの長さなどの詳細な形状を設計する際には、切削物の排出性と歯科用根管治療器具１０の破断強度とのバランスを検討する必要がある。
Here, the shaft 12 is formed with a spiral groove 12a continuous from the cutting edge of the working unit 11. In addition, the spiral groove 12a has a spiral pitch larger than that of the cutting blade spiral or a groove width larger than that of the cutting blade spiral, thereby further improving the discharge performance of the cut object. be able to. However, when designing a detailed shape such as the length of the spiral groove 12a, it is necessary to consider the balance between the dischargeability of the cut material and the breaking strength of the dental root canal treatment instrument 10.
図２は、シャフトにテーパー部を有する歯科用根管切削具であって、（ａ）斜視図、（ｂ）はシャフトの拡大平面図である。なお、テーパー部２２ａを設けず、シャンク２２の全長を細い径にすると、切削物の排出性を向上させることはできるのだが、歯科用根管切削具２０の破断強度は弱くなるため、テーパー部２２ａとすることで破断強度を担保している。
FIG. 2 shows a dental root canal cutting tool having a tapered portion on the shaft, where (a) is a perspective view and (b) is an enlarged plan view of the shaft. Note that if the shank 22 is not provided with the taper portion 22a and the overall length of the shank 22 is made thin, it is possible to improve the discharge performance of the cut material, but the breaking strength of the dental root canal cutting tool 20 is weakened. The breaking strength is secured by setting 22a.
この歯科用根管切削具２０は、図１で示したものと同様に、螺旋状の切刃からなり先端に向かって細くなっている形状の作業部２１と、その作業部２１の後端に連なるシャフト２２と、そのシャフト２２の後端に連なり図示していない歯科用ハンドピースに接続される把持部２３と、を有するものである。
This dental root canal cutting tool 20 is similar to the one shown in FIG. 1, and has a working portion 21 having a spiral cutting edge and narrowing toward the tip, and a rear end of the working portion 21. It has a continuous shaft 22 and a grip 23 connected to a dental handpiece (not shown) connected to the rear end of the shaft 22.
ここで、シャフト２２は、作業部２１の後端に向かって細くなっているテーパー部２２ａと、テーパー部２２ａの後端に連なりテーパー部２２ａの最太部の径と同一径のストレート部２２ｂと、からなる。
Here, the shaft 22 includes a tapered portion 22a that narrows toward the rear end of the working portion 21, and a straight portion 22b that is continuous with the rear end of the tapered portion 22a and has the same diameter as the thickest portion of the tapered portion 22a. It consists of.
そして、テーパー部２２ａの最細部の径は、作業部２１の後端断面の外接円の径よりも小さいこととする。図３は、作業部の後端断面を示す図であって、（ａ）は作業部断面が三角形の場合、（ｂ）は作業部断面が円形の一部を切り取った形状の場合である。なお、当然この作業部２１の後端２１ａの形状は例示であり、この二種類に限定されるものではない。
And the diameter of the finest detail of the taper part 22a shall be smaller than the diameter of the circumscribed circle of the rear-end cross section of the working part 21. FIGS. 3A and 3B are diagrams showing a rear end cross section of the working unit, where FIG. 3A shows a case where the working unit cross section is a triangle, and FIG. 3B shows a case where the working unit cross section is a part of a circular shape. Of course, the shape of the rear end 21a of the working unit 21 is merely an example, and is not limited to these two types.
ここで、作業部２１は先端が細くなっているテーパー形状なので、作業部２１の後端２１ａは、作業部２１の最太部ということになる。そして、外接円２１ｃというのは、その作業部２１の後端２１ａの断面に外接する円のことであり、図では二点鎖線で示している。つまり、外接円２１ｃは、図３（ａ）のように作業部２１の後端２１ａの断面形状が三角形などの多角形の場合は、その多角形の各頂点が円周上を通る円となる。また、図３（ｂ）のように断面形状が円の一部を切り取って切刃を形成しているような形状の場合は、その切り取られた一部を仮想的に埋めた円を外接円２１ｃと考えればよい。
Here, since the working part 21 has a tapered shape with a thin tip, the rear end 21a of the working part 21 is the thickest part of the working part 21. The circumscribed circle 21c is a circle circumscribing the cross section of the rear end 21a of the working unit 21, and is indicated by a two-dot chain line in the drawing. That is, when the cross-sectional shape of the rear end 21a of the working unit 21 is a polygon such as a triangle as shown in FIG. 3A, the circumscribed circle 21c is a circle in which each vertex of the polygon passes on the circumference. . In addition, when the cross-sectional shape is a shape in which a part of a circle is cut out to form a cutting blade as shown in FIG. 3B, a circle in which the cut-out part is virtually filled is circumscribed. Think of it as 21c.
なお、切削物の排出性を考えると、テーパー部２２ａの最細部の径２２ａ１は、図３（ａ）のように作業部の後端２１ａの断面が多角形の場合は、破線に示すような、その多角形の内接円くらいの径又はそれ以下の径にするのがよいと考えられる。同様に、図３（ｂ）のように作業部２１の後端２１ａの断面が円の一部を切り取った形状の場合は、図３（ｂ）の破線に示すような、その切り取られた部分の底の位置に接するような径又はそれ以下の径にするのがよい。これらのような形状にすれば、螺旋状の切刃を通ってきた切削物を、滑らかにテーパー部２２ａに侵入させて排出することができるからである。
In consideration of the dischargeability of the cut object, the most detailed diameter 22a1 of the tapered portion 22a is as shown by a broken line when the cross section of the rear end 21a of the working portion is polygonal as shown in FIG. It is considered that the diameter should be about the inscribed circle of the polygon or less. Similarly, when the cross section of the rear end 21a of the working portion 21 is a shape obtained by cutting a part of a circle as shown in FIG. 3B, the cut portion as shown by the broken line in FIG. It is good to make it the diameter which touches the position of the bottom of this, or the diameter below it. This is because, with such a shape, the cut material that has passed through the spiral cutting blade can smoothly enter the tapered portion 22a and be discharged.
まとめると、テーパー部２２ａの最細部の径２２ａ１は、作業部の後端２１ａの外接円２１ｃよりも小さい径であって、できれば、作業部の後端２１ａの内接円程度の径にするのがよい。ただし、最細部の径２２ａ１が小さい場合には、歯科用根管切削具としての破断強度が弱くなるので、強度と排出性のバランスを考えた設計が必要となる。
In summary, the most detailed diameter 22a1 of the tapered portion 22a is smaller than the circumscribed circle 21c of the rear end 21a of the working portion, and if possible, the diameter is about the inscribed circle of the rear end 21a of the working portion. Is good. However, when the finest diameter 22a1 is small, the breaking strength as a dental root canal cutting tool becomes weak, so a design that takes into account the balance between strength and dischargeability is required.
以上のように、本発明では、シャンクに螺旋溝やテーパー部を設けることで切削物の排出性を高めているので、基本的には、歯科用ハンドピースに取り付けるものが対象となっている。把手を設けて、手で動かすタイプの場合は、切削物の排出量がそれ程多くないため、螺旋溝やテーパー部を設けても排出を促す効果は小さいからである。ただし、手動の場合でも、切削物は排出されるので、本発明と同様の螺旋溝やテーパー部を設けても問題はない。
As described above, according to the present invention, the spiral groove and the tapered portion are provided in the shank to enhance the discharge of the cut material. Therefore, the object to be attached to the dental handpiece is basically targeted. This is because, in the case of a type in which a handle is provided and moved by hand, the amount of discharge of the cut material is not so large, and even if a spiral groove or a tapered portion is provided, the effect of promoting discharge is small. However, even in the case of manual operation, since the cut object is discharged, there is no problem even if a spiral groove or a tapered portion similar to the present invention is provided.
１０、２０ 歯科用根管切削具
１１、２１ 作業部
２１ａ 作業部の後端
１２、２２ シャフト
１２ａ 螺旋溝
２２ａ テーパー部
２２ａ１ 最細部の径
２２ｂ ストレート部
１３、２３ 把持部 10, 20 Dental root canal cutting tool 11, 21 Working portion 21a Working portion rear end 12, 22 Shaft 12a Spiral groove 22a Taper portion 22a1 Finest diameter 22b Straight portion 13, 23 Grasping portion
１１、２１ 作業部
２１ａ 作業部の後端
１２、２２ シャフト
１２ａ 螺旋溝
２２ａ テーパー部
２２ａ１ 最細部の径
２２ｂ ストレート部
１３、２３ 把持部 10, 20 Dental root
Claims (4)
- 螺旋状の切刃からなり先端に向かって細くなっている形状の作業部と、
前記作業部の後端に連なり前記作業部の後端断面の外接円と同一径のシャフトと、
前記シャフトの後端に連なり歯科用ハンドピースに接続される把持部と、を有し、
前記シャフトに前記作業部の切刃から連続する螺旋溝が形成されていることを特徴とする歯科用根管切削具。 A working part having a spiral cutting edge and narrowing toward the tip;
A shaft having the same diameter as the circumscribed circle of the rear end cross section of the working portion, which is connected to the rear end of the working portion;
A gripping part connected to a dental handpiece connected to the rear end of the shaft,
A dental root canal cutting tool, wherein a spiral groove continuous from the cutting edge of the working portion is formed on the shaft. - 前記螺旋溝は、前記切刃の螺旋状よりも螺旋ピッチが大きいことを特徴とする請求項１に記載の歯科用根管切削具。 The dental root canal cutting tool according to claim 1, wherein the spiral groove has a spiral pitch larger than the spiral shape of the cutting blade.
- 前記螺旋溝は、前記切刃の螺旋状よりも溝幅が大きいことを特徴とする請求項１又は２に記載の歯科用根管切削具。 The dental root canal cutting tool according to claim 1 or 2, wherein the spiral groove has a larger groove width than the spiral shape of the cutting edge.
- 螺旋状の切刃からなり先端に向かって細くなっている形状の作業部と、
前記作業部の後端に連なるシャフトと、
前記シャフトの後端に連なり歯科用ハンドピースに接続される把持部と、を有し、
前記シャフトが、前記作業部の後端に向かって細くなっているテーパー部と、前記テーパー部の後端に連なり前記テーパー部の最太部の径と同一径のストレート部と、からなり、前記テーパー部の最細部の径が前記作業部の後端断面の外接円の径よりも小さいことを特徴とする歯科用根管切削具。 A working part having a spiral cutting edge and narrowing toward the tip;
A shaft connected to the rear end of the working unit;
A gripping part connected to a dental handpiece connected to the rear end of the shaft,
The shaft is composed of a tapered portion that is narrowed toward the rear end of the working portion, and a straight portion that is continuous with the rear end of the tapered portion and has the same diameter as the thickest portion of the tapered portion, A dental root canal cutting tool, wherein the diameter of the finest part of the tapered portion is smaller than the diameter of the circumscribed circle of the rear end cross section of the working portion.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2015-253267 | 2015-12-25 | ||
| JP2015253267A JP2017113361A (en) | 2015-12-25 | 2015-12-25 | Dental root amputation instrument |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2017111079A1 true WO2017111079A1 (en) | 2017-06-29 |
Family
ID=59090546
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/JP2016/088483 WO2017111079A1 (en) | 2015-12-25 | 2016-12-22 | Dental root canal cutting tool |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP2017113361A (en) |
| WO (1) | WO2017111079A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114390917A (en) * | 2019-10-11 | 2022-04-22 | 马尼株式会社 | Dental file |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018169362A2 (en) * | 2017-03-17 | 2018-09-20 | 주식회사 덴플렉스 | Endodontic file for dental endodontic treatment |
| JP7143262B2 (en) | 2019-08-22 | 2022-09-28 | マニー株式会社 | dental root canal instrument |
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|---|---|---|---|---|
| JPH0592013A (en) * | 1991-03-01 | 1993-04-16 | Les Fils Auguste Maillefer Sa A Ballaigu | Borer set for dental root hole |
| US5947730A (en) * | 1997-10-31 | 1999-09-07 | Board Of Regents, The University Of Texas System | Increased taper segmental rotary files |
| JP2002253578A (en) * | 2001-02-28 | 2002-09-10 | Manii Kk | Dental reamer |
| US20150320517A1 (en) * | 2013-01-30 | 2015-11-12 | Maillefer Instruments Holding Sarl | Instrument for drilling dental root canals |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5882198A (en) * | 1997-03-28 | 1999-03-16 | Ormco Corporation | Endodontic instrument having enhanced compliance at the tip |
| US20040023186A1 (en) * | 2002-05-16 | 2004-02-05 | Mcspadden John T. | Multi-tapered endodontic file |
| US20070207439A1 (en) * | 2006-03-03 | 2007-09-06 | Lynch Robert P | Endodontic file having a taper defined by a continuously changing concavity |
| JP5135614B2 (en) * | 2009-10-21 | 2013-02-06 | 福井県 | Drill for composite material and machining method and machining apparatus using the same |
| JP5476590B1 (en) * | 2013-03-08 | 2014-04-23 | 福井県 | Drill for composite material and machining method and machining apparatus using the same |
-
2015
- 2015-12-25 JP JP2015253267A patent/JP2017113361A/en not_active Abandoned
-
2016
- 2016-12-22 WO PCT/JP2016/088483 patent/WO2017111079A1/en active Application Filing
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0592013A (en) * | 1991-03-01 | 1993-04-16 | Les Fils Auguste Maillefer Sa A Ballaigu | Borer set for dental root hole |
| US5947730A (en) * | 1997-10-31 | 1999-09-07 | Board Of Regents, The University Of Texas System | Increased taper segmental rotary files |
| JP2002253578A (en) * | 2001-02-28 | 2002-09-10 | Manii Kk | Dental reamer |
| US20150320517A1 (en) * | 2013-01-30 | 2015-11-12 | Maillefer Instruments Holding Sarl | Instrument for drilling dental root canals |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114390917A (en) * | 2019-10-11 | 2022-04-22 | 马尼株式会社 | Dental file |
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|---|---|
| JP2017113361A (en) | 2017-06-29 |
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