JP7517679B2 - Tooth root model - Google Patents

Tooth root model Download PDF

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JP7517679B2
JP7517679B2 JP2020070529A JP2020070529A JP7517679B2 JP 7517679 B2 JP7517679 B2 JP 7517679B2 JP 2020070529 A JP2020070529 A JP 2020070529A JP 2020070529 A JP2020070529 A JP 2020070529A JP 7517679 B2 JP7517679 B2 JP 7517679B2
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tooth root
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いずみ 藤肥
育美 佐藤
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株式会社ホクシンエレクトロニクス
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この発明は、歯科学生や研修医等の根管治療実習用に用いる歯根模型に関し、より詳細には電気的根管長測定器を用いた根管治療実習用に用いることができる根管模型に関する。 This invention relates to a tooth root model used for root canal treatment training by dental students, medical interns, etc., and more specifically to a root canal model that can be used for root canal treatment training using an electric root canal length measuring device.

従来、電気的根管長測定器を用いた根管治療実習に歯根模型が用いられていた。特許文献１によれば、歯根模型は象牙質を含む歯根部と、歯根部の内側に位置する根管部とを備える。このような歯根模型を電気的根管長測定器に固定し、根管部にファイルを挿入することによって根管治療の実習をおこなっていた。 Conventionally, a tooth root model has been used for root canal treatment training using an electrical root canal length measuring device. According to Patent Document 1, the tooth root model has a root portion including dentin and a root canal portion located inside the root portion. Root canal treatment training has been carried out by fixing such a tooth root model to an electrical root canal length measuring device and inserting a file into the root canal portion.

特開２０１１－０８５６１４Patent Publication 2011-085614

従来の歯根模型は、実際の歯根とは根管の形状が異なっていた。実際の歯根の根管は、その先端部分の根尖から約０．５～１．０ｍｍ内側に生理学的根尖と言われるものがある。すなわち、実際の歯根の根管は根尖の手前約０．５～１．０ｍｍ内側の位置で最も細くなり、そこからさらに広がっている。この最も細くなった部分を生理学的根尖と呼ぶ。根管の最も狭い部分、すなわち生理学的根尖の直径は約０．１～０．３ｍｍであり、根尖孔の直径は約０．２～０．５ｍｍである。 Conventional tooth root models have root canal shapes that are different from those of actual tooth roots. The root canal of an actual tooth root has what is called the physiological apex about 0.5 to 1.0 mm inside the apex at the tip. In other words, the root canal of an actual tooth root is narrowest at a position about 0.5 to 1.0 mm inside before the apex, and then widens further from there. This narrowest part is called the physiological apex. The diameter of the narrowest part of the root canal, i.e. the physiological apex, is about 0.1 to 0.3 mm, and the diameter of the apical foramen is about 0.2 to 0.5 mm.

このように、実際の歯根の形状と、歯根模型との形状とが異なることから、実際の歯根に即した実習ができていないという問題があった。 As a result, the shape of the actual tooth root differs from the shape of the tooth root model, which created the problem of not being able to provide training that was in line with the actual tooth root.

この発明は、歯根模型の根管の形状を実際の歯根に近づけることによって、より実物に近い感覚で実習することができる歯根模型を提供することを課題とする。 The objective of this invention is to provide a tooth root model that allows training with a feeling closer to the real thing by making the shape of the root canal of the tooth root model closer to that of an actual tooth root.

この発明は、第１面と、前記第１面に対向する第２面とを備え、前記第１面に設けられた第１開口と、前記第２面に設けられた第２開口と、前記第１開口及び前記第２開口を連通する連通路と、を備える歯根模型であって、前記連通路には、断面積が前記第１開口の開口面積より小さくかつ前記第２開口の開口面積よりも小さい小径部を備え、前記小径部の直径は０．１～０．３ｍｍであり、前記小径部から前記第２面までの寸法は０．５～１．０ｍｍであることを特徴とする。
連通路に小径部を設けることにより、実際の歯根に存在する生理学的根尖を再現することができ、より実物に近い実習が可能となる。 The present invention provides a tooth root model comprising a first surface and a second surface opposite to the first surface, a first opening provided in the first surface, a second opening provided in the second surface, and a communication passage connecting the first opening and the second opening, wherein the communication passage has a small diameter portion whose cross-sectional area is smaller than the opening area of the first opening and smaller than the opening area of the second opening, the diameter of the small diameter portion is 0.1 to 0.3 mm, and the dimension from the small diameter portion to the second surface is 0.5 to 1.0 mm.
By providing a small diameter portion in the communication passage, it is possible to reproduce the physiological apex that exists in an actual tooth root, enabling training that is closer to the real thing.

前記連通路には、前記第１開口から前記小径部に向かって断面積が小さくなる第１テーパ部と、前記第２開口から前記小径部に向かって断面積が小さくなる第２テーパ部とをさらに設けることを特徴とする。
上記のような形状にすることによって、さらに実際の歯根の根管に近い形状とすることができる。 The communicating passage is further provided with a first tapered section whose cross-sectional area decreases from the first opening toward the small diameter section, and a second tapered section whose cross-sectional area decreases from the second opening toward the small diameter section.
By forming the above shape, it is possible to obtain a shape that is closer to the root canal of an actual tooth root.

前記第１面及び前記第２面の間に位置する周面を備え、前記連通路は、少なくとも一部が前記周面から視認可能であることを特徴とする。
周面から連通路を確認しながら実習することができるので、感覚的な技術を習得するために有効である。 The nozzle may further include a peripheral surface located between the first surface and the second surface, and at least a portion of the communication passage may be visible from the peripheral surface.
Since the connecting passages can be seen from the outside during practice, it is effective for acquiring intuitive skills.

この発明に係る歯根模型によれば、実際の歯根に存在する生理学的根尖を再現することができ、より実物に近い実習が可能となる。 The tooth root model of this invention can reproduce the physiological root apex that exists in an actual tooth root, making it possible to carry out training that is closer to the real thing.

この発明の実施形態に係る歯根の使用状態の斜視図。FIG. 2 is a perspective view of a dental root according to an embodiment of the present invention in use. 歯根模型の拡大断面図。Enlarged cross-sectional view of the tooth root model. 図２のＩＩＩ拡大図。FIG. 3 is an enlarged view of FIG.

図１～図３を参照すれば、歯根模型１０は、第１面１と、第１面１に対向する第２面２と、これら第１面１及び第２面２との間に位置する周面３とを備える。この実施形態において、歯根模型１０は直方体である。より詳細には、第１面１及び第２面２は正方形であり、周面３は二対の対向する長方形からなる。この実施形態において、第１面１及び第２面２の一片は約１３～２５ｍｍであり、周面３を構成する一つの面の高さは約７～１５ｍｍである。なお、この実施形態において第１面１及び第２面２を正方形としているが、これに限定されるものではなく、長方形、その他の多角形、又は円形等であってもよい。 Referring to Figures 1 to 3, the tooth root model 10 comprises a first surface 1, a second surface 2 opposing the first surface 1, and a peripheral surface 3 located between the first surface 1 and the second surface 2. In this embodiment, the tooth root model 10 is a rectangular parallelepiped. More specifically, the first surface 1 and the second surface 2 are square, and the peripheral surface 3 is made up of two pairs of opposing rectangles. In this embodiment, each side of the first surface 1 and the second surface 2 is approximately 13 to 25 mm, and the height of each face constituting the peripheral surface 3 is approximately 7 to 15 mm. Note that, although the first surface 1 and the second surface 2 are square in this embodiment, they are not limited to this and may be rectangular, other polygonal, or circular.

このような歯根模型１０は、第１面１に設けられた第１開口１１と、第２面２に設けられた第２開口１２と、第１開口１１及び第２開口１２を連通する連通路４とを備える。連通路４には、その断面積が第１開口１１の開口面積より小さくかつ第２開口１２の開口面積よりも小さい小径部４１を備える。さらに、連通路４は、第１開口１１から小径部４１に向かってその断面積が小さくなる第１テーパ部４２と、第２開口１２から小径部４１に向かってその断面積が小さくなる第２テーパ部４３とを設ける。この実施形態において、第１テーパ部４２は、第１開口１１側に位置するとともに傾斜角が大きい部位１１ａと、傾斜角が小さい部位１１ｂとを有し、部位１１ｂと第２テーパ部４３との間に小径部４１が設けられる。 Such a tooth root model 10 includes a first opening 11 provided on the first surface 1, a second opening 12 provided on the second surface 2, and a communication passage 4 that connects the first opening 11 and the second opening 12. The communication passage 4 includes a small diameter portion 41 whose cross-sectional area is smaller than that of the first opening 11 and smaller than that of the second opening 12. Furthermore, the communication passage 4 includes a first tapered portion 42 whose cross-sectional area decreases from the first opening 11 toward the small diameter portion 41, and a second tapered portion 43 whose cross-sectional area decreases from the second opening 12 toward the small diameter portion 41. In this embodiment, the first tapered portion 42 is located on the first opening 11 side and has a portion 11a with a large inclination angle and a portion 11b with a small inclination angle, and the small diameter portion 41 is provided between the portion 11b and the second tapered portion 43.

上記のような構成において、第１開口１１は楕円形を有し、短径が約１．７５ｍｍ、長径が約３．０ｍｍである。第２開口１２の直径は約０．１５～２．０ｍｍ、小径部４１の直径は約０．１～０．３ｍｍである。第２テーパ部４３における小径部４１から第２面２までの長さ寸法は約０．５～１．０ｍｍであり、第１面１１から小径部４１までの長さ寸法は、第２面１２から小径部４１までの寸法よりも大きい。 In the above configuration, the first opening 11 has an elliptical shape with a minor axis of approximately 1.75 mm and a major axis of approximately 3.0 mm. The diameter of the second opening 12 is approximately 0.15-2.0 mm, and the diameter of the small diameter portion 41 is approximately 0.1-0.3 mm. The length dimension from the small diameter portion 41 to the second surface 2 in the second tapered portion 43 is approximately 0.5-1.0 mm, and the length dimension from the first surface 11 to the small diameter portion 41 is greater than the dimension from the second surface 12 to the small diameter portion 41.

この実施形態において、歯根模型１０は透明なエポキシ樹脂によって形成される。したがって、周面３から連通路４を視認可能である。ただし、小径部４１は連通路４全体に対して非常に小さく、肉眼での識別は困難である。ここでいう視認可能とは、その細部にわたってまで識別するという意図ではなく、全体としてそこにあることを理解できるというものである。 In this embodiment, the tooth root model 10 is made of a transparent epoxy resin. Therefore, the communication passage 4 can be seen from the peripheral surface 3. However, the small diameter portion 41 is very small compared to the entire communication passage 4, and is difficult to see with the naked eye. Being visible here does not mean being able to see every detail, but being able to understand that it is there as a whole.

上記のような歯根模型１０は図示しない電気的根管長測定器に固定され、実習に用いられる。より具体的には、歯根模型１０を電気的根管長測定器に固定し、連通路４に根管治療に用いる針状のファイルを挿入することによって、歯根模型１０を歯根に、連通路４を根管に見立てて根管治療の実習訓練を行う。電気的根管長測定器及びファイルは、実際の根管治療に用いられるものを用いることができる。実際の根管治療において、電気的根管長測定器とファイルは電気的に接続され、ファイル先端と根尖孔との離間距離に応じて音や光等が変化し、その距離が分かるようになっている。ファイルは、根管内の汚染された組織を掻き出すための器具で、その先端が根尖孔近傍にまで達するように使用するのが好ましい。一方で根尖孔を突き出ると患者に強い痛みが生じてしまう。したがって、ファイル先端がどこまで届いているのかが治療において重要になる。また、近年の電気的根管長測定器は、技術の進歩により、根尖孔のみならず生理学的根尖からファイル先端までの離間距離をも検知可能となっている。 The above-mentioned tooth root model 10 is fixed to an electric root canal length measuring device (not shown) and used for practice. More specifically, the tooth root model 10 is fixed to the electric root canal length measuring device, and a needle-shaped file used for root canal treatment is inserted into the connecting passage 4, so that the tooth root model 10 is likened to the tooth root and the connecting passage 4 is likened to the root canal, and practice training for root canal treatment is performed. The electric root canal length measuring device and the file can be those used in actual root canal treatment. In actual root canal treatment, the electric root canal length measuring device and the file are electrically connected, and sound and light change depending on the distance between the tip of the file and the apical foramen, so that the distance can be known. The file is an instrument for scraping out contaminated tissue in the root canal, and it is preferable to use it so that its tip reaches the vicinity of the apical foramen. On the other hand, if it protrudes from the apical foramen, the patient will experience severe pain. Therefore, it is important in treatment to know how far the tip of the file has reached. In addition, recent technological advances in electronic root canal length measuring devices have made it possible to detect not only the apical foramen but also the distance from the physiological root apex to the tip of the file.

この実施形態の歯根模型１０において、連通路４には小径部４１を備えているから、歯根に存在する生理学的根尖を再現することができる。このような歯根模型１０を用い、電気的根管長測定器及びファイルにより測定することによって実際の歯根に近い状況での実習訓練が可能となる。 In this embodiment of the tooth root model 10, the connecting passage 4 is provided with a small diameter portion 41, so that the physiological apex present in the tooth root can be reproduced. By using such a tooth root model 10 and measuring with an electric root canal length measuring device and a file, it becomes possible to carry out practical training in a situation close to that of an actual tooth root.

連通路４は、周面３から視認可能であるので、指先の感覚と実際のファイルの位置とを確認しながら実習を行うことができ、感覚的な技術を習得するために有効である。実際の歯根の治療においては、歯根及び根管を視認することができず、手探りでの作業になるが、指先の感覚とファイルの位置とを実習時に確認することによって、実際の治療に活かすことができる。 The communication passage 4 is visible from the peripheral surface 3, so the practitioner can practice while checking the sensation of their fingertips and the actual position of the file, which is effective for acquiring sensory skills. In actual root treatment, the tooth root and root canal cannot be seen, and the work must be done by feel, but by checking the sensation of their fingertips and the position of the file during practice, the practitioner can utilize the knowledge gained in the actual treatment.

この実施形態において、連通路４はひとつのみであるが、複数あってもよい。また、歯根模型１０全体の形状は直方体に限定されるものではない。さらに、歯根模型１０に別途歯牙模型を取り付けることもできる。また、連通路４の内側を着色することもできる。 In this embodiment, there is only one communication passage 4, but there may be multiple. Furthermore, the overall shape of the tooth root model 10 is not limited to a rectangular parallelepiped. Furthermore, a tooth model can be attached separately to the tooth root model 10. Furthermore, the inside of the communication passage 4 can be colored.

１ 第１面
２ 第２面
３ 周面
４ 連通路
１０ 歯根模型
１１ 第１開口
１２ 第２開口
４１ 小径部
４２ 第１テーパ部
４３ 第２テーパ部 REFERENCE SIGNS LIST 1 First surface 2 Second surface 3 Circumferential surface 4 Communication passage 10 Tooth root model 11 First opening 12 Second opening 41 Small diameter portion 42 First tapered portion 43 Second tapered portion

Claims (3)

第１面と、前記第１面に対向する第２面とを備え、
前記第１面に設けられた第１開口と、前記第２面に設けられた第２開口と、
前記第１開口及び前記第２開口を連通する連通路と、
を備える歯根模型であって、
前記連通路には、断面積が前記第１開口の開口面積より小さくかつ前記第２開口の開口面積よりも小さい小径部を備え、
前記小径部の直径は０．１～０．３ｍｍであり、前記小径部から前記第２面までの寸法は０．５～１．０ｍｍであることを特徴とする歯根模型。 A first surface and a second surface opposite to the first surface,
a first opening provided on the first surface and a second opening provided on the second surface;
a communication passage that communicates the first opening and the second opening;
A tooth root model comprising:
the communication passage includes a small diameter portion having a cross-sectional area smaller than an opening area of the first opening and smaller than an opening area of the second opening,
A tooth root model, characterized in that the diameter of the small diameter portion is 0.1 to 0.3 mm, and the dimension from the small diameter portion to the second surface is 0.5 to 1.0 mm. 前記連通路には、前記第１開口から前記小径部に向かって断面積が小さくなる第１テーパ部と、前記第２開口から前記小径部に向かって断面積が小さくなる第２テーパ部とをさらに設けることを特徴とする請求項１記載の歯根模型。 2. The tooth root model according to claim 1, characterized in that the communication passage further includes a first tapered portion whose cross-sectional area decreases from the first opening toward the small diameter portion, and a second tapered portion whose cross-sectional area decreases from the second opening toward the small diameter portion. 前記第１面及び前記第２面の間に位置する周面を備え、
前記連通路は、少なくとも一部が前記周面から視認可能であることを特徴とする請求項１又は２記載の歯根模型。 a peripheral surface located between the first surface and the second surface;
3. The tooth root model according to claim 1, wherein at least a part of the communication passage is visible from the peripheral surface.
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JP2011085614A (en) 2009-10-13 2011-04-28 Jsr Corp Tooth model and method for manufacturing the same
JP2015036811A (en) 2013-08-12 2015-02-23 株式会社ホクシンエレクトロニクス Coloring method and use method of pulp cavity of dental pulp model
JP2015141214A (en) 2014-01-27 2015-08-03 株式会社ニッシン Pulp cavity model

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Publication number Priority date Publication date Assignee Title
JP2011085614A (en) 2009-10-13 2011-04-28 Jsr Corp Tooth model and method for manufacturing the same
JP2015036811A (en) 2013-08-12 2015-02-23 株式会社ホクシンエレクトロニクス Coloring method and use method of pulp cavity of dental pulp model
JP2015141214A (en) 2014-01-27 2015-08-03 株式会社ニッシン Pulp cavity model

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