JPH0433846Y2 - - Google Patents
Info
- Publication number
- JPH0433846Y2 JPH0433846Y2 JP11677186U JP11677186U JPH0433846Y2 JP H0433846 Y2 JPH0433846 Y2 JP H0433846Y2 JP 11677186 U JP11677186 U JP 11677186U JP 11677186 U JP11677186 U JP 11677186U JP H0433846 Y2 JPH0433846 Y2 JP H0433846Y2
- Authority
- JP
- Japan
- Prior art keywords
- tip
- taper
- root canal
- cutting tool
- file
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 210000004746 tooth root Anatomy 0.000 claims description 4
- 210000004262 dental pulp cavity Anatomy 0.000 description 30
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 210000004283 incisor Anatomy 0.000 description 2
- 241000282465 Canis Species 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000001225 therapeutic effect Effects 0.000 description 1
- 210000004357 third molar Anatomy 0.000 description 1
Landscapes
- Dental Tools And Instruments Or Auxiliary Dental Instruments (AREA)
Description
【考案の詳細な説明】
＜産業上の利用分野＞
本考案は根管を切削することが出来る歯科用の
治療具に係り、特に湾曲した根管を容易に切削す
ることが出来る歯科用根管治療具に関するもので
ある。[Detailed description of the invention] <Industrial application field> The present invention relates to a dental treatment tool that can cut a root canal, and in particular, a dental root canal that can easily cut a curved root canal. It concerns therapeutic equipment.
＜従来の技術＞
従来のリーマ、フアイル等の根管切削具１は第
４図に示す如く、国際規格（ISO）で規定された
２／１００のテーパーを持つて切削刃部の全体が構成
されていた。この2/100のテーパーとは長さが100
mmで２mm太くなる傾斜を示すものである。<Prior art> As shown in FIG. 4, a conventional root canal cutting tool 1 such as a reamer or a file has a cutting blade having a taper of 2/100 as specified by the international standard (ISO). was. This 2/100 taper has a length of 100
mm indicates a slope that increases by 2 mm.
＜考案が解決しようとする問題点＞
然るに従来の2/100のテーパーを持つた切削具
は可撓性が少ないために直状根管の切削をするこ
とは可能であるが、湾曲根管の切削治療にこれを
使用することは極めて困難であつた。<Problems that the invention aims to solve> However, conventional cutting tools with a 2/100 taper have little flexibility, so while it is possible to cut straight root canals, it is difficult to cut curved root canals. It was extremely difficult to use this for cutting treatment.
一般的に中切歯、側切歯、犬歯等の前歯の根管
はほとんど湾曲しておらず、直状根管を有してい
るが、第１小臼歯、第２小臼歯、第１大臼歯、第
２大臼歯、第３大臼歯等の臼歯２に於いては第２
図に示す如く、ほとんどの根管３の先端が湾曲し
て構成されている。そして、その湾曲部は根尖か
ら２〜３mm部が多い。 In general, the root canals of front teeth such as central incisors, lateral incisors, and canines are almost uncurved and have straight root canals, but In molars 2 such as molars, second molars, and third molars, the second
As shown in the figure, most of the root canals 3 have curved tips. The curved portion is often 2 to 3 mm from the root apex.
従つて従来の切削具１を使用した場合には第２
図に示す如く、切削具１の先端が根管３の湾曲し
た部分から約３mm以下の部分で逸脱して破線４で
示す位置を誤つて切削してしまう例が多かつた。
依つて現実には臼歯２の根管３の切削は湾曲部の
入口迄とする歯科医がほとんどであつた。しか
し、切削具１によつて根管３をせつかく切削して
も、一番問題の多い根管３の先端部が切削出来な
い場合には切削の効果が半減する等の問題があつ
た。 Therefore, when using the conventional cutting tool 1, the second
As shown in the figure, there were many cases in which the tip of the cutting tool 1 deviated from the curved portion of the root canal 3 by about 3 mm or less, resulting in erroneous cutting at the position indicated by the broken line 4.
In reality, most dentists cut the root canal 3 of the molar tooth 2 up to the entrance of the curved part. However, even if the root canal 3 is diligently cut with the cutting tool 1, there is a problem that if the distal end of the root canal 3, which is the most problematic part, cannot be cut, the cutting effect is halved.
又、従来の前述の問題点を改善する為に一部に
は切削具１のテーパーを小さくすると共に全体を
細くして可撓性を持たせる構造も試みられたが、
この様な構造にした場合には可撓性に富んだテー
パーの小さい細い部分に的確に力を伝えることが
困難となり、切削具１の先端の状態を術者が正確
に感知することが出来ず、又感知が可能であつた
としても術者がこの切削具１を適切に操作してそ
の先端に力を伝えることが困難である等の問題が
あつた。 In addition, in order to improve the above-mentioned conventional problems, some attempts have been made to reduce the taper of the cutting tool 1 and to make the entire cutting tool thinner to make it more flexible.
If such a structure is adopted, it becomes difficult to accurately transmit force to the thin and small tapered part that is highly flexible, and the operator is unable to accurately sense the state of the tip of the cutting tool 1. Furthermore, even if sensing was possible, there were problems such as it being difficult for the operator to properly operate the cutting tool 1 and transmit force to its tip.
更に、別なもう一つの問題は、従来2/100のテ
ーパーのものは、根管入口、フレア部及びフレア
部に近い根管の中央部を切削具を管壁に側圧して
押し引きし、フアイリングする際には、テーパー
がゆるくて可撓性に富み過ぎて思うように削るこ
とが出来ないという点である。その為に先部は細
い切削具を必要とする段階にも関わらず、元部の
切削の為に太い切削具と取り替えて元部拡大を行
う必要があつた。 Furthermore, another problem is that with the conventional 2/100 taper, the cutting tool is pushed and pulled against the canal wall by applying lateral pressure to the root canal entrance, the flared part, and the central part of the root canal near the flared part. When filing, the taper is too loose and flexible, so you can't cut it as you want. For this reason, even though the tip requires a thin cutting tool, it was necessary to replace the tip with a thick cutting tool to enlarge the root.
本考案に係る切削具は従来のこれ等の問題点を
根本的に改善した全く新規な技術であり、特に湾
曲した根管の切削を容易にすることを可能とした
新規な切削具を提供しようとするものである。 The cutting tool according to the present invention is a completely new technology that fundamentally improves these conventional problems, and in particular, we would like to provide a new cutting tool that makes it possible to easily cut curved root canals. That is.
＜問題点を解決するための手段＞
本考案は0.3mm以下の先端径で2/100未満のテー
パーを持つた切削刃先部と、3/100以上のテーパ
ーを有しかつ元部の径がシヤンク以下の径を持つ
た切削刃元部とで構成したことを特徴とした歯科
用根管切削具である。<Means for solving the problem> The present invention has a cutting edge with a tip diameter of 0.3 mm or less and a taper of less than 2/100, and a cutting edge with a taper of 3/100 or more and a shank in the base diameter. This dental root canal cutting tool is characterized by comprising a cutting blade base having the following diameter.
＜作用＞
本考案に於ける切削具は上述の如く、0.3mm以
下の先端径で2/100未満のテーパーを持つた切削
刃先部と、3/100以上のテーパーを有しかつ元部
の径がシヤンク以下の径を持つた切削刃元部とで
構成したので、湾曲した根管の開拡切削に使用し
た場合には切削具の先部が根管の湾曲部に沿つて
自動的に湾曲して挿入され、かつその切削具の先
端の状態を術者が容易に感知することが出来ると
共にその先端に適切な力を伝えて正確に操作する
ことが出来る。<Function> As mentioned above, the cutting tool in the present invention has a cutting edge with a tip diameter of 0.3 mm or less and a taper of less than 2/100, and a cutting tool with a taper of 3/100 or more and a base diameter of 0.3 mm or less. The tip of the cutting tool automatically curves along the curved part of the root canal when used to open and widen a curved root canal. The operator can easily sense the state of the tip of the cutting tool and transmit an appropriate force to the tip to operate it accurately.
更に、根管入口、フレア部及びこれに近い根管
中央部の至大に3/100以上のテーパーを持つた刃
元部によつて的確に拡大操作が出来ると共に、刃
の元端を使用する際にも、刃元端はシヤンク径よ
り小さく、即ち逆段を構成しないので、刃元端で
フレア部等に大きなキズを付けることはない。 Furthermore, the blade base has a taper of 3/100 or more at the root canal entrance, the flared part, and the central part of the root canal near this area, allowing for accurate enlarging operations and allowing the use of the base end of the blade. In this case, the blade base end is smaller than the shank diameter, that is, it does not form a reverse stage, so there is no possibility of causing large scratches on the flared portion or the like at the blade base end.
＜実施例＞
図により本考案に係る切削具の一実施例を具体
的に説明すると、第１図に於いて、５は本考案に
係るリーマ、フアイル等の歯科用根管切削具であ
り、切削刃５ａ、シヤンク５ｂ及び柄５ｃより構
成されている。又該切削刃５ａは先部５a-1と元
部５a-2とに区分され、該先部５a-1の先端径H1は
0.3mm以下でかつ全体のテーパーは2/100未満に形
成され、更に元部５a-2のテーパーは3/100以上で
かつ元端径H2はシヤンク５ｂの径H3以下に構成
されている。<Example> An example of the cutting tool according to the present invention will be specifically described with reference to the drawings. In FIG. 1, 5 is a dental root canal cutting tool such as a reamer or file according to the present invention; It is composed of a cutting blade 5a, a shank 5b, and a handle 5c. The cutting blade 5a is divided into a tip 5a -1 and a base 5a -2 , and the tip diameter H1 of the tip 5a -1 is
The taper of the base part 5a-2 is 0.3 mm or less and the overall taper is less than 2/100, and the taper of the base part 5a-2 is 3/100 or more, and the base end diameter H2 is configured to be less than the diameter H3 of the shank 5b. There is.
＜比較例＞
(A) 従来のフアイル
先端径を0.15mm、先端より16mm迄の切刃部のテ
ーパーを2/100、切刃部の元径を0.47、シヤンク
径を0.6mmとした。<Comparative example> (A) Conventional file The tip diameter was 0.15 mm, the taper of the cutting edge up to 16 mm from the tip was 2/100, the original diameter of the cutting edge was 0.47, and the shank diameter was 0.6 mm.
(B) 本考案のフアイル
先端径H1を0.15mm、先端より３mm迄のテーパ
ーを０，３mmから５mmまでのテーパーを2/100、
５mmから15mmまでのテーパーを4/100、切刃部の
元径H2を0.59、シヤンク径H3を0.6mmとしした。(B) File of this invention Tip diameter H 1 is 0.15mm, taper up to 3mm from the tip is 0, taper from 3mm to 5mm is 2/100,
The taper from 5 mm to 15 mm was 4/100, the original diameter H 2 of the cutting edge was 0.59, and the shank diameter H 3 was 0.6 mm.
上述の従来のフアイルＡと本考案のフアイルＢ
との先端から３mm部の曲がり方、曲率半径を求め
比較すると次の通りである。 The above-mentioned conventional file A and the file B of the present invention
The bending direction and radius of curvature of the 3mm portion from the tip are determined and compared as follows.
曲率半径Ｒ＝EI／Ｍ
但しＥはヤング率で材料で決まり、Ｉは断面二
次モーメント（ここでは近似的に断面を円として
取り扱う）、Ｍはモーメント即ち荷重Ｗ×距離で
ある。 Radius of curvature R=EI/M where E is Young's modulus determined by the material, I is the moment of inertia of area (here, the cross section is treated approximately as a circle), and M is the moment, that is, load W x distance.
従来のフアイルＡの曲率半径Raは
曲率半径Ra＝Eπd4／64／３×Ｗ
で表され、ｄは先端から３mmの位置の太さである
ので、
0.15＋２／100×３＝0.21
となり、従つて
Ra＝Eπ・（0.21）4／3W×64
の式が成立する。 The radius of curvature Ra of the conventional file A is expressed as the radius of curvature Ra=Eπd 4 /64/3×W, and d is the thickness at a position of 3 mm from the tip, so 0.15+2/100×3=0.21, and the conventional Then, the formula Ra=Eπ・(0.21) 4 /3W×64 holds true.
本考案のフアイルＢの曲率半径Rbは
Rb＝Eπd4／64／３×Ｗ
で表され、ｄは先端から３mmの位置の太さである
がテーパーが０の為、先端径H1と同じ0.15であ
る。従つて、
Rb＝Eπ・（0.15）4／3W×64
の式が成立する。 The radius of curvature Rb of the file B of this invention is expressed as Rb=Eπd 4 /64/3×W, where d is the thickness at 3 mm from the tip, but since the taper is 0, the radius of curvature is 0.15, which is the same as the tip diameter H 1 . It is. Therefore, the formula Rb=Eπ・(0.15) 4 /3W×64 holds true.
前述の両者の式を比較すると、
Rb／Ra＝（0.15）4／（0.21）4＝0.260≒１／3.8
3
となる。 Comparing both equations above, Rb/Ra=(0.15) 4 /(0.21) 4 =0.260≒1/3.8
It becomes 3.
即ち、従来のフアイルＡの先端部３mmに2/100
のテーパーのあるものと、本考案のフアイルＢの
先端部３mmにテーパーが０のものとを比較する
と、曲率半径に於いて本考案のフアイルＢが従来
のフアイルＡに比較して約1/4であることが明ら
かである。 In other words, 2/100 in the tip 3mm of conventional file A.
Comparing the tapered file B of the present invention and the file B of the present invention with no taper at the tip of 3 mm, the radius of curvature of the file B of the present invention is approximately 1/4 that of the conventional file A. It is clear that
依つて、従来のフアイルＡを使用して先端が曲
がつた根管３を切削した場合には第３図Ａに示す
如くフアイルＡの先端が根管３に沿つて湾曲せ
ず、強く押し込んだ場合にはそのまま根管３の周
りの組織に挿通されたのに対し、本考案のフアイ
ルＢを同様に使用した場合には第３図Ｂに示す如
く、その先端部が根管３の曲がつた部分に沿つて
スムーズに自動的に湾曲した。 Therefore, when cutting a root canal 3 with a curved tip using the conventional file A, the tip of the file A did not curve along the root canal 3 and was forced into the root canal 3 as shown in Fig. 3A. In this case, the file B of the present invention was inserted into the tissue around the root canal 3 as it was, whereas when the file B of the present invention was used in the same way, the tip part was inserted into the tissue around the root canal 3, as shown in Fig. 3B. Automatically curved smoothly along the ivy.
次に、上記従来のフアイルＡと、本考案の他の
実施例であるフアイルＣ（図示せず）とを比較す
る。 Next, the conventional file A will be compared with a file C (not shown) which is another embodiment of the present invention.
(C) 他の実施例に係るフアイル
先端径H1を0.15mm、先端より３mm迄のテーパ
ーを1/100、３mmから５mmまでのテーパーを2/10
０、５mmから15mmまでのテーパーを4/100、切刃部
の元径H2を0.59mm、シヤンク径H3を0.6mmとし
た。(C) Files related to other examples Tip diameter H 1 is 0.15 mm, taper up to 3 mm from the tip is 1/100, taper from 3 mm to 5 mm is 2/10
The taper from 0.5 mm to 15 mm was 4/100, the original diameter H 2 of the cutting edge was 0.59 mm, and the shank diameter H 3 was 0.6 mm.
前述と同様の計算式を用いて曲率半径Rcを計
算すると
Rc＝Eπd4／64／３×Ｗ
Rc／Ra＝（0.18）4／（0.21）4＝0.54
となる。 When the radius of curvature Rc is calculated using the same calculation formula as above, Rc=Eπd 4 /64/3×W Rc/Ra=(0.18) 4 /(0.21) 4 =0.54.
即ち、本実施例に係るフアイルＣでは従来のフ
アイルＡと比較して約半分の力で曲げることが可
能である。 That is, the file C according to this embodiment can be bent with about half the force as the conventional file A.
更に本考案に於ける切削具は上述の如く、切削
刃５ａの元部５a-2のテーパーが3/100以上に形成
されているので、この部分が強く安定しており、
従つて術者が先端部の感触を正確に感じると共に
術者が切削具を適切に操作し、その先端に力を確
実に伝えることが出来ると共に根管元部の拡大
も、テーパーが大きいので、必要な剛性を有し、
的確な切削が出来る。 Furthermore, as mentioned above, in the cutting tool of the present invention, the taper of the base portion 5a -2 of the cutting blade 5a is formed to be 3/100 or more, so this portion is strong and stable.
Therefore, the operator can accurately feel the feel of the tip, operate the cutting tool appropriately, and reliably transmit force to the tip, and the root canal base can also be expanded due to the large taper. Has the necessary rigidity,
Accurate cutting is possible.
＜考案の効果＞
本考案に係る切削具は上述の如く構造と作用と
を有するので、先端部が柔軟性を有すると共にそ
の元部が強く安定しており、従つてその先端部は
曲がつた根管に沿つて湾曲させることが出来、こ
れによつて従来極めて困難とされている曲がつた
根管の先端部を簡単確実に切削治療することが出
来、更に根管元部の拡大も器具を太いもの替える
ことなく、同一のもので的確に切削出来る等の特
徴を有するものである。<Effects of the invention> Since the cutting tool according to the invention has the structure and function as described above, the tip part is flexible and the base part is strong and stable. The instrument can be curved along the root canal, making it possible to easily and reliably cut the tip of a curved root canal, which was previously considered extremely difficult, and also to enlarge the base of the root canal. It has features such as being able to cut accurately with the same material without having to change to a thicker one.
第１図は本考案の切削具の側面図、第２図は根
管を示す断面拡大図、第３図Ａ、Ｂ、は従来のも
のと本考案のものとを比較する説明図、第４図は
従来例を示す説明図である。
１は従来の切削具、２は臼歯、３は根管、５は
本考案の切削具、５ａは切削刃、５ｂはシヤン
ク、５ｃは柄、５a-1は先部、５a-2は元部であ
る。
Fig. 1 is a side view of the cutting tool of the present invention, Fig. 2 is an enlarged cross-sectional view showing the root canal, Fig. 3 A and B are explanatory diagrams comparing the conventional one and the one of the present invention, and Fig. 4 The figure is an explanatory diagram showing a conventional example. 1 is a conventional cutting tool, 2 is a molar tooth, 3 is a root canal, 5 is a cutting tool of the present invention, 5a is a cutting blade, 5b is a shank, 5c is a handle, 5 a-1 is a tip, 5 a-2 is a It is Motobu.
Claims (1)
つた切削刃先部と、3/100以上のテーパーを有し
かつ元部の径がシヤンク以下の径を持つた切削刃
元部とで構成したことを特徴とした歯科用根管切
削具。 Consists of a cutting blade tip with a tip diameter of 0.3 mm or less and a taper of less than 2/100, and a cutting blade base with a taper of 3/100 or more and a base diameter of shank or less. A dental root canal cutting tool that is characterized by:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11677186U JPH0433846Y2 (en) | 1986-07-31 | 1986-07-31 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11677186U JPH0433846Y2 (en) | 1986-07-31 | 1986-07-31 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6322910U JPS6322910U (en) | 1988-02-15 |
| JPH0433846Y2 true JPH0433846Y2 (en) | 1992-08-13 |
Family
ID=31001672
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11677186U Expired JPH0433846Y2 (en) | 1986-07-31 | 1986-07-31 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0433846Y2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH071132Y2 (en) * | 1991-09-19 | 1995-01-18 | ピヤス合資会社 | Root canal filling device |
| JP4186713B2 (en) * | 2003-05-29 | 2008-11-26 | マニー株式会社 | Root canal treatment instrument and manufacturing method |
-
1986
- 1986-07-31 JP JP11677186U patent/JPH0433846Y2/ja not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6322910U (en) | 1988-02-15 |
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