JP4351401B2 - Artificial tooth root - Google Patents
Artificial tooth root Download PDFInfo
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- JP4351401B2 JP4351401B2 JP2001052398A JP2001052398A JP4351401B2 JP 4351401 B2 JP4351401 B2 JP 4351401B2 JP 2001052398 A JP2001052398 A JP 2001052398A JP 2001052398 A JP2001052398 A JP 2001052398A JP 4351401 B2 JP4351401 B2 JP 4351401B2
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- Prior art keywords
- screw
- end side
- rear end
- artificial tooth
- tooth root
- 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.)
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
- A61C8/00—Means to be fixed to the jaw-bone for consolidating natural teeth or for fixing dental prostheses thereon; Dental implants; Implanting tools
- A61C8/0018—Means to be fixed to the jaw-bone for consolidating natural teeth or for fixing dental prostheses thereon; Dental implants; Implanting tools characterised by the shape
- A61C8/0022—Self-screwing
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- Health & Medical Sciences (AREA)
- Oral & Maxillofacial Surgery (AREA)
- Orthopedic Medicine & 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 Prosthetics (AREA)
Description
【0001】
【発明の属する技術分野】
本発明は、人工歯根、特に即時荷重の機能を有する人工歯根に関するものである。
【0002】
【従来の技術】
従来から、骨内に埋入する部分の外周に螺子が形成され、骨と強固に固定することを図った人工歯根が用いられている。
【0003】
かかる人工歯根は、顎骨の海綿骨部分(奥側)に当接する先端側部と顎骨の皮質骨部分(表面側)に当接する後端側部とで同一ピッチ、同一断面形状の螺子が形成されたものであった。なお、螺子の断面形状は中央が外方に突出し、螺子山の表面が人工歯根の軸線に対してテーパー状に形成されたものであった。
【0004】
【発明が解決しようとする課題】
しかしながら、上記従来の人工歯根は、硬い皮質骨側で大きな固定力を得るための工夫が施されておらず、骨と人工歯根との固定力の点で改善の余地があった。
【0005】
また、上記人工歯根は、螺子の断面形状が中央が外方に突出し、螺子山の表面が人工歯根の軸線に対してテーパー状に形成されたものであったため、人工歯根の埋入初期に人工歯根の沈み込みや浮き上がりを引き起こすことがあった。
【0006】
すなわち、先端側部における螺子山の先端側面が人工歯根の軸線に対してテーパー状であったので噛合荷重が人工歯根の先端部に伝わりやすく、先端部において先端方向への荷重が大きくって沈みこみが発生し易くなる恐れがあった。
【0007】
他方、抜歯創における皮質骨の骨縁部は埋入直後、すう疎な状態となっていることが多く、したがって、この部分は人工歯根の後端側への引っ張り応力に弱い状態となっている。このとき、後端側部における螺子山の後端側面がテーパー状であったので、埋入初期に、螺子山の後端側面が対面する骨を潰して、人工歯根が後端側方向に抜けてしまう恐れがあった。
【0008】
これら従来技術の課題に鑑み、本発明では人工歯根の埋入初期に人工歯根の沈み込みや浮き上がりを防止し、また、骨への固定力を大きくすることを目的とする。
【0009】
【課題を解決するための手段】
上記課題を解決するため、人工歯根は、先端側面と後端側面とを備えた螺子山を有する第1螺子が外周に形成された先端側部と、該先端側部と同軸状に連続し且つ先端側面と後端側面とを備えた螺子山を有する第2螺子が形成された後端側部と、上記先端側部と上記後端側部との間に、螺子山が形成されていない外周面を有する中間部とを有し、上記先端側部の第1螺子は、単条螺子の螺子山で構成されるとともに上記先端側面が上記先端側部および上記後端側部の軸線に対して略直交し、上記後端側部の第2螺子は、多条螺子の螺子山で構成されるとともに上記後端側面が上記先端側部および上記後端側部の軸線に対して略直交することを特徴とする。
【0010】
かかる構成によれば、上記先端側部は螺子山を構成する先端側面が人工歯根の軸線に対して略直交方向に形成されたことにより、噛合荷重を平均的に逃がし、人工歯根の沈み込みを防ぐことができる。
【0011】
他方、上記後端側部は螺子山を構成する後端側面が人工歯根の軸線に対して略直交することにより埋入直後の浮き上がりを防止することができる。
【0013】
上記後端側部の第2螺子を多条螺子としたことにより、硬い皮質骨にあたる後端側部の固定力を上げることによって、人工歯根全体の骨への固定力を飛躍的に高めることができる。
また、ある実施態様においては、上記第1螺子の螺子高さが、上記第2螺子の螺子高さよりも大きいことを特徴とする。
【0014】
【発明の実施の形態】
以下、本発明の実施形態例を図によって説明する。
【0015】
図1〜図3は本実施形態の人工歯根を示し、これらの図において符号1は人工歯根、2は後端側部、3は先端側部、4は第2螺子、5は第1螺子である。
【0016】
図1〜図3に示す人工歯根1は、本発明の一実施形態による人工歯根1である。
【0017】
この人工歯根1は、外周にセルフタップ式の第1螺子5が形成された先端側部3と、該先端側部3から同軸状に連続し且つその外周にセルフタップ式の第2螺子4が形成された後端側部2とを有する。また、図2に示すように、上記先端側部3の第1螺子5は螺子山を構成する先端側面5aが人工歯根1の軸線L(図1参照)に対して略直交方向に形成され、図3に示すように上記後端側部2の第2螺子4は螺子山を構成する後端側面4aが人工歯根1の軸線Lに対して略直交方向に形成されている。
【0018】
上記人工歯根1の材質としては、Ti−6Al−4V合金、純チタンなどの生体に安全な金属材が用いられる。また、その表面には陽極酸化、ハイドロキシアパタイト溶射、サンドブラスト、チタン溶射等の表面と骨との親和性を高める処理を施すことが好ましい。
【0019】
上記先端側部2は、一方端側(図1における下側)がドーム状となっている。また、その外周に形成された上記第1螺子5は、螺子高さd2が後端側部3における第2螺子4の螺子高さd1よりも大きく設定されている。
【0020】
上記後端側部2は、前述のように第2螺子4を有するが、そのリードは円筒条部の第1螺子5と略同一となっている。すなわち、上記第2螺子4がn条螺子(nは整数)の場合に、その1つの螺子山からn個目の螺子山までの距離w1が、先端側部3における第1螺子5の隣接する螺子山間の距離w2にほぼ等しい。
【0021】
また、上記人工歯根1において、上記後端側部2の第2螺子4を多条螺子としたので、硬い皮質骨に螺合する後端側部2の固定力を上げることができ、これによって、人工歯根1全体の顎骨への固定力を飛躍的に高めることができる。
【0022】
上記先端側部3は第1螺子5の螺子山を構成する先端側面5aが人工歯根1の軸線Lに対して略直交方向に形成されたので、噛合荷重を平均的に逃がし、人工歯根1の沈み込みを防ぐことができる。これは、螺子山の先端側面5aがテーパー状であると上記噛合荷重が人工歯根1の先端部に伝わりやすく、先端部において先端方向への荷重が大きくなって沈みこみ易くなるところ、上記のような構成により、噛合荷重を水平な面で吸収することができるためである。
【0023】
他方、上記後端側部2は第2螺子4の螺子山を構成する後端側面4aが人工歯根1の軸線Lに対して略直交方向に形成されていることにより、また、埋入直後の浮き上がりを防止することができる。抜歯創における皮質骨の骨縁部B1は埋入直後、すう疎な状態となっていることが多く、したがって、この部分は人工歯根1の後端側への引っ張り応力に弱い状態となっている。このとき、螺子山の後端側面4aが人工歯根1の軸線Lに対してテーパー状であると、埋入初期に、後端側面4aが対面する骨を潰して、人工歯根1が後端側方向に抜けてしまい易くなるところ、第2螺子4の後端側面4aを人工歯根1の軸線Lに対して略直交する方向に形成されているので、人工歯根1が後端側方向に抜けてしまうことを防止することができる。
【0024】
以上、本発明の実施形態を例示したが、本発明はこれら実施形態に限定されるものではなく、発明の目的を逸脱しない限り任意の形態とすることができることは言うまでもない。
【0025】
【発明の効果】
以上のように、本発明の人工歯根は、先端側面と後端側面とを備えた螺子山を有する第1螺子が外周に形成された先端側部と、該先端側部と同軸状に連続し且つ先端側面と後端側面とを備えた螺子山を有する第2螺子が外周に形成された後端側部とを有し、上記先端側部の第1螺子は螺子山を構成する上記先端側面が上記先端側部および上記後端側部の軸線に対して略直交し、上記後端側部の第2螺子は螺子山を構成する上記後端側面が上記先端側部および上記後端側部の軸線に対して略直交することにより、噛合荷重を平均的に逃がし、人工歯根の沈み込みを防ぐことができ、上記後端側部では埋入直後の浮き上がりを防止することができる。
【0026】
また、上記人工歯根において、上記後端側部の第2螺子を多条螺子とした場合、硬い皮質骨であたる後端側部の固定力を上げることによって、人工歯根全体の骨への固定力を飛躍的に高めることができる。
【図面の簡単な説明】
【図1】本発明一実施形態の人工歯根の側面図である。
【図2】図1の人工歯根の先端側部に形成した第1螺子の螺子山形状を示す図1の領域Yの拡大断面図である。
【図3】図1の人工歯根の後端側部に形成した第2螺子の螺子山形状を示す図1の領域Xの拡大断面図である。
【符号の説明】
1 人工歯根
2 後端側部
3 先端側部
4 第2螺子
4a(第2螺子の)後端側面
5 第1螺子
5a(第1螺子の)先端側面
d1 螺子山高さ
d2 螺子山高さ
w1 幅
w2 幅
L 軸線[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an artificial tooth root, and more particularly to an artificial tooth root having an immediate load function.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, an artificial tooth root is used in which a screw is formed on the outer periphery of a portion to be embedded in a bone and firmly fixed to the bone.
[0003]
In such an artificial tooth root, a screw having the same pitch and the same cross-sectional shape is formed on the tip side portion contacting the cancellous bone portion (back side) of the jaw bone and the rear end side portion contacting the cortical bone portion (surface side) of the jaw bone. It was. The cross-sectional shape of the screw was such that the center protruded outward and the surface of the screw thread was tapered with respect to the axis of the artificial tooth root.
[0004]
[Problems to be solved by the invention]
However, the conventional artificial tooth root has not been devised for obtaining a large fixing force on the side of the hard cortical bone, and there is room for improvement in terms of the fixing force between the bone and the artificial tooth root.
[0005]
In addition, the artificial tooth root has a cross-sectional shape that protrudes outward from the center of the screw and the surface of the screw thread is tapered with respect to the axis of the artificial tooth root. It sometimes caused the roots to sink or lift.
[0006]
That is, the tip side surface of the screw thread at the tip side portion is tapered with respect to the axis of the artificial tooth root, so that the meshing load is easily transmitted to the tip portion of the artificial tooth root, and the load in the tip direction at the tip part becomes large and sinks. There was a risk that dent would easily occur.
[0007]
On the other hand, the bone margin of cortical bone in the extraction tooth is often in a sparse state immediately after insertion, and therefore this part is in a state that is weak against tensile stress toward the rear end side of the artificial tooth root. . At this time, since the rear end side surface of the screw thread at the rear end side portion was tapered, the bone facing the rear end side surface of the screw thread was crushed at the initial stage of embedding, and the artificial tooth root fell out in the rear end direction. There was a fear.
[0008]
In view of these problems of the prior art, it is an object of the present invention to prevent the artificial root from sinking or lifting in the initial stage of the artificial root implantation and to increase the fixing force to the bone.
[0009]
[Means for Solving the Problems]
To solve the above problem, the artificial tooth root, a tip side portion of the first screw is formed on the outer periphery with a thread having a tip side and the rear end side, continuous with the tip sides and coaxially In addition, no screw thread is formed between the rear end side portion on which the second screw having a screw thread provided with the front end side surface and the rear end side surface is formed, and the front end side portion and the rear end side portion. and an intermediate portion having an outer peripheral surface, the first screw of the distal end portion, said distal end side while being constituted by threads of birth screw relative to the axis of the distal end side and the rear side Te substantially perpendicular, the second screw of the rear end sides, the rear side while being constituted by threads of multiple-thread screw is substantially perpendicular to the axis of the distal end side and the rear side It is characterized by that.
[0010]
According to such a configuration, the tip side portion is formed such that the tip side surface constituting the screw thread is substantially perpendicular to the axis of the artificial tooth root, so that the meshing load is released on average and the artificial tooth root is subducted. Can be prevented.
[0011]
On the other hand, the rear side can be prevented end side floats up immediately after entering embedding by substantially perpendicular to the axis of the dental implant after composing the thread.
[0013]
By making the second screw on the rear end side portion a multi-threaded screw, the fixing force on the rear end side portion corresponding to the hard cortical bone is increased, thereby dramatically increasing the fixing force to the bone of the entire artificial tooth root. I can .
Also, in some embodiments, screw height of the first screw, characterized in that greater than thread height of the second screw.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
[0015]
1 to 3 show an artificial tooth root of the present embodiment, in which the reference numeral 1 is an artificial tooth root, 2 is a rear end side part, 3 is a front end side part, 4 is a second screw, and 5 is a first screw. is there.
[0016]
The artificial tooth root 1 shown in FIGS. 1 to 3 is an artificial tooth root 1 according to an embodiment of the present invention.
[0017]
This artificial tooth root 1 has a distal end side portion 3 having a self-tapping first screw 5 formed on the outer periphery thereof, and a coaxial tap continuous from the distal end side portion 3 and a self-tapping second screw 4 on the outer periphery thereof. And a rear
[0018]
As the material of the artificial root 1, a biologically safe metal material such as Ti-6Al-4V alloy or pure titanium is used. The surface is preferably subjected to a treatment for increasing the affinity between the surface and bone, such as anodic oxidation, hydroxyapatite spraying, sandblasting, and titanium spraying.
[0019]
As for the said front
[0020]
The rear
[0021]
Further, in the artificial tooth root 1, since the second screw 4 of the rear
[0022]
The tip side portion 3 has a tip side surface 5a constituting a thread of the first screw 5 formed in a direction substantially orthogonal to the axis L of the artificial tooth root 1, so that the meshing load can be released on average and the artificial tooth root 1 Sinking can be prevented. This is because if the tip side surface 5a of the screw thread is tapered, the meshing load is easily transmitted to the tip portion of the artificial tooth root 1, and the load in the tip direction becomes large at the tip portion and the sinking tip tends to sink. This is because the meshing load can be absorbed by a horizontal surface with a simple configuration.
[0023]
On the other hand, the rear
[0024]
As mentioned above, although embodiment of this invention was illustrated, this invention is not limited to these embodiment, It cannot be overemphasized that it can be set as arbitrary forms, unless it deviates from the objective of invention.
[0025]
【The invention's effect】
As described above, the artificial tooth root of the present invention includes a front end side portion having a first thread having a screw thread having a front end side surface and a rear end side surface formed on the outer periphery, and the front end side portion coaxially and continuously. A second screw having a screw thread provided with a tip side surface and a rear end side surface; and a rear end side portion formed on an outer periphery, and the first screw on the tip side portion constitutes the screw thread. Is substantially orthogonal to the axis of the front end side and the rear end side, and the second screw of the rear end side is the rear end side constituting the screw thread is the front end side and the rear end side By being substantially orthogonal to the axis, the meshing load can be released on average, and the artificial root can be prevented from sinking, and the rear end side can be prevented from being lifted immediately after implantation.
[0026]
Further, in the artificial tooth root, when the second screw on the rear end side portion is a multi-thread screw, the fixing force on the bone of the entire artificial tooth root is increased by increasing the fixing force on the rear end side portion which is a hard cortical bone. Can be dramatically improved.
[Brief description of the drawings]
FIG. 1 is a side view of an artificial tooth root according to an embodiment of the present invention.
2 is an enlarged cross-sectional view of a region Y in FIG. 1 showing a thread shape of a first screw formed on the distal end side portion of the artificial tooth root in FIG. 1;
3 is an enlarged cross-sectional view of a region X in FIG. 1 showing a screw thread shape of a second screw formed on the rear end side portion of the artificial tooth root in FIG. 1;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1
Claims (2)
該先端側部と同軸状に連続し且つ先端側面と後端側面とを備えた螺子山を有する第2螺子が外周に形成された後端側部と、
上記先端側部と上記後端側部との間に、螺子山が形成されていない外周面を有する中間部とを有し、
上記先端側部の第1螺子は、単条螺子の螺子山で構成されるとともに上記先端側面が上記先端側部および上記後端側部の軸線に対して略直交し、
上記後端側部の第2螺子は、多条螺子の螺子山で構成されるとともに上記後端側面が上記先端側部および上記後端側部の軸線に対して略直交することを特徴とする人工歯根。A tip side portion formed on the outer periphery with a first screw having a screw thread having a tip side surface and a rear end side surface;
A rear end side portion formed on the outer periphery of a second screw having a screw thread that is concentrically continuous with the front end side portion and includes a front end side surface and a rear end side surface ;
Between the front end side part and the rear end side part, an intermediate part having an outer peripheral surface in which no screw thread is formed ,
The first screw of the distal end portion, said distal end side is substantially perpendicular to the axis of the distal end side and the rear side while being constituted by threads of birth screw,
The second screw of the rear end sides, the rear side while being constituted by threads of multiple-thread screw, characterized in that the substantially perpendicular to the axis of the distal end side and the rear side Artificial tooth root.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2001052398A JP4351401B2 (en) | 2001-02-27 | 2001-02-27 | Artificial tooth root |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2001052398A JP4351401B2 (en) | 2001-02-27 | 2001-02-27 | Artificial tooth root |
Publications (3)
Publication Number | Publication Date |
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JP2002253581A JP2002253581A (en) | 2002-09-10 |
JP2002253581A5 JP2002253581A5 (en) | 2008-02-14 |
JP4351401B2 true JP4351401B2 (en) | 2009-10-28 |
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JP2001052398A Expired - Fee Related JP4351401B2 (en) | 2001-02-27 | 2001-02-27 | Artificial tooth root |
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR101427202B1 (en) * | 2014-02-21 | 2014-08-07 | 주식회사 바이오세텍 | Fixture for dentaL implant |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100886672B1 (en) * | 2007-03-23 | 2009-03-04 | 주식회사 제일메디칼코퍼레이션 | Orthodontic screw having micro groove portion |
US8758012B2 (en) * | 2008-07-14 | 2014-06-24 | Nobel Biocare Services Ag | Compact dental implant |
JP5259557B2 (en) * | 2009-11-20 | 2013-08-07 | 興達生技有限公司 | Dental implant |
JP2012010835A (en) * | 2010-06-30 | 2012-01-19 | Yamamoto Precious Metal Co Ltd | Implant screw, root of artificial tooth and artificial joint fixing bolt |
-
2001
- 2001-02-27 JP JP2001052398A patent/JP4351401B2/en not_active Expired - Fee Related
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR101427202B1 (en) * | 2014-02-21 | 2014-08-07 | 주식회사 바이오세텍 | Fixture for dentaL implant |
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JP2002253581A (en) | 2002-09-10 |
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