JP4179652B2

JP4179652B2 - Implant body and method for forming implant body

Info

Publication number: JP4179652B2
Application number: JP22780997A
Authority: JP
Inventors: 通三山中; 健嗣長谷川
Original assignee: Yoshida Dental Mfg Co Ltd
Current assignee: Yoshida Dental Mfg Co Ltd
Priority date: 1997-08-25
Filing date: 1997-08-25
Publication date: 2008-11-12
Anticipated expiration: 2017-08-25
Also published as: JPH1156877A

Description

【０００１】
【発明の属する技術分野】
本発明は、歯科技工の分野で用いられるインプラント体とインプラント体の形成方法に関する。
【０００２】
【従来の技術】
従来、インプラント体を歯槽骨に植立し固定する歯科技工の分野においては、インプラント体を歯槽骨に植立した後、再びその部分の歯肉を縫合して約数年間待ち、歯槽骨が成長することによりインプラント体と歯槽骨を強固に固着させるようにしている。
【０００３】
図１７に従来の拡張形のインプラント体５０を示す。このインプラント体５０は、下部にスリット５５を有する本体５１の内周部に、ねじ体５３の回転力を利用して拡開体５２を上昇させ、本体５１の下部に左右に開く拡開部５１ａを形成したものである。
【０００４】
【発明が解決しようとする課題】
しかしながら、図１７に示した従来技術の場合、拡開部５１ａの下部には空洞が生じて、上部からの力に対して大きな抵抗力を示さない。また、周辺の骨成分がこの空洞を埋めるようになるため拡開部５１ａの先端部分の骨密度は極めて薄くなってしまう。また拡開部５１ａの拡開によって生じた骨密度の濃くなった部分もインプラント体５０の保持力に寄与していないと言える。
【０００５】
また、従来技術の場合、一般的に言って一旦インプラント体を歯槽骨に植立しこの後、再びインプラント体の植立部の歯肉を切開し、インプラント体の上部を露出させ、その後の作業を続ける必要があった。患者は半年間は充分な咀嚼機能が回復せず、不便な生活を強いられるばかりでなく、半年後に再びインプラント体の植立部を切開するという肉体的苦痛を伴うことになる。
【０００６】
すなわち、従来のインプラント体は、抜歯直後の抜歯溝へ植立するのは不可能であった。抜歯溝の形状には個人差があり、円筒形をしたインプラント体を抜歯溝へ植立しても歯槽骨との密着部分が少なく固定することは不可能であった。従って、抜歯してから数年待ち抜歯溝が完全になくなるまで待たなければならないこととなるが、抜歯溝の後は歯槽骨が薄くなることが知られている。このためインプラント体の植立自体が難しくなるケースが頻繁に生じていた。
【０００７】
尚、従来においては、インプラント体の一部分を歯槽骨に埋没した直後に機械的に拡張する技術も提案されているが、この場合、インプラン体の下部のみを拡張するため歯槽骨との充分な固着力は得られないという課題があった。
【０００８】
また、この従来技術の場合、インプラント体の一部分の拡張時に歯槽骨に空洞を作ってしまうため、歯槽骨が薄くなる危険性も指摘されていた。
【０００９】
本発明は、上記事情に鑑みてなされたものであり、抜歯溝等との間の保持力を増し、即日に使用可能な人工歯牙を形成することを可能としたインプラント体とインプラント体の形成方法を提供することを目的とする。
【００１０】
【課題を解決するための手段】
本発明の請求項１のインプラント体は、肉厚部を貫く任意個数の膨出部形成用のスリット部を設け、当該肉厚部の外周にネジ部のない略円筒状の本体と、前記本体のスリット部を境として前記本体の外周より外方に膨出させた前記スリット部の形状で画される膨出部を形成する拡開ねじ体とから成るインプラント体において、前記本体の前記膨出部形成用のスリット部のうち、本体上部にはスリット部に囲まれる領域を本体の外周面から円周方向に沿って膨出させた膨出部と、本体中央部には、スリット部に囲まれる領域を外周面から外方に膨出させ、本体の上方に向けて開口する膨出部と、本体下部には、スリット部に囲まれる領域を本体の外周面から外方に膨出させ、本体の下方に向けて開口する膨出部とを設けるとともに前記本体の内側には一方の端部より他方の端部に偏心したテーパ部を備える複数の孔を開口し、かつこの本体の中心には前記各孔のテーパ部を損なうことのないサイズの孔を貫通するように開口して設けることにより構成し、前記拡開ねじ体を前記本体の内側に挿入しつつ回転することにより前記拡開ねじ体の各凸部を、前記本体の各孔のテーパ部に沿って回転し、拡開ねじ体の各凸部の段部を、前記本体の各テーパ部の角部に係合して、前記拡開ねじ体を前記本体内の定位置に固定しつつ前記本体の各膨出部を形成することにより構成したことを特徴とするものである。
【００１１】
本発明の請求項１のインプラント体によれば、本体の上部、中央部及び下部に膨出部を膨出するため、このインプラント体を抜歯溝に植立した場合、あらゆる方向からの力に対して強力な保持力を発揮できる。従って、従来のインプラント体に比較して植立直後から強力な保持力を発揮し即日の上部構造の構築が可能であり即咀嚼機能が回復する。また抜歯溝を利用しての植立が可能になり、抜歯溝が起因となり歯槽骨が薄くなることを防止することもできる。
【００１２】
また、本発明の請求項２のインプラント体は、請求項１記載のインプラント体において前記各膨出部は、前記各スリット部を境として本体の外周面より外方に膨出させた、前記各スリット部により画されるコの字形状又はコの字形状に近似した形状の膨出部により構成したことを特徴とするものである。
【００１４】
この発明によれば、インプラント体の一部をコの字形状又はコの字形状に近似した形状の膨出部を利用して、前記本体の中央部及び下部においては、その長さ方向に沿って上向き及び下向きに膨出させるとともに、前記本体の上部においては、その円周方向に沿って膨出させるため、インプラント体に加わるあらゆる方向からの力に対して強力な保持力を発揮できる。従って、従来のインプラント体に比較して植立直後から強力な保持力を発揮し即日の上部構造の構築が可能であり即咀嚼機能が回復する。また抜歯溝を利用しての植立が可能になり、抜歯溝が起因となり歯槽骨が薄くなることを防止することもできる。
【００１７】
また、本発明の請求項３記載の発明のインプラント体は、略円筒状に形成され、肉厚部を貫く膨出部形成用のスリット部を設け、スリット部により囲まれる領域の内周側に受凸部を設けた本体の内部に、拡開ねじ体を挿入して回転し、前記受凸部を拡開ねじ体に設けた膨出凸部により外方に膨出させてスリット部により囲まれる領域を膨出部とすることを特徴とするものである。
【００１８】
この請求項３の発明によれば、拡開ねじ体の回転操作という簡略な工程に基づいて、前記本体の受凸部が拡開ねじ体に設けた膨出凸部により外方に膨出することになり、これにより、スリット部により囲まれる領域を膨出部とすることができる。
【００１９】
また、本発明の請求項４記載の発明のインプラント体は、略円筒状に形成され、かつ外周にネジ部のない肉厚部を設け、この肉厚部を貫く膨出部形成用のスリット部を設け、さらにこのスリット部の下側に、雌ねじを有するとともに外側に突出する押上凸部を備えた押上体が挿通可能な空隙部を設けた本体に対して、この本体の上部から前記空隙部に挿通された押上体の雌ねじに螺合する雄ねじ体を挿入し、雄ねじ体を回転させて前記押上体を上昇させ、押上体の押上凸部を介して前記スリット部により囲まれる領域を外方に膨出させて任意数の膨出部とすることを特徴とするものである。
【００２０】
この発明によれば、既述した請求項１記載の発明のような作用を発揮するインプラント体を、雄ねじ体の回転による押上体の上昇動作という簡略な工程で形成できる。
【００２１】
本発明の請求項５記載の発明のインプラント体の形成方法は、略円筒状に形成され、かつ外周にネジ部のない肉厚部を設け、この肉厚部を貫く膨出部形成用のスリット部を設け、さらにこのスリット部の下側に、雌ねじを有するとともに外側に突出する押上凸部を備えた押上体が挿通可能な空隙部を設けた本体に対して、この本体の上部から前記空隙部に挿通された押上体の雌ねじに螺合するねじ部及び頭部を有する雄ねじ体を挿入し、雄ねじ体を回転させて前記押上体を上昇させ、押上体の押上凸部を介して前記スリット部により囲まれる領域を外方に膨出させて任意数の膨出部とし、前記雄ねじ体の頭部領域と本体の対応部分とを密封加工することを特徴とするものである。
【００２２】
この発明によれば、請求項４記載の発明の場合と同様、請求項１記載の発明のような作用を発揮するインプラント体を、雄ねじ体の回転による押上体の上昇動作という簡略な工程で形成できるとともに、前記雄ねじ体の頭部領域と本体の対応部分とを密封加工するものであるから、前記雄ねじ体の頭部領域と本体との間の隙間からの細菌等の侵入を防止することができる。
【００２５】
【発明の実施の形態】
以下に、本発明の実施の形態を詳細に説明する。
【００２６】
図１乃至図５は、本発明の実施の形態１のインプラント体１及びその形成方法を示すものである。図１に示すインプラント体１は、チタン又はステンレスにアパタイト等をコーティングして生体への親和性の良い材料を用いて略円筒状に形成し、かつ外周にはネジ部のない肉厚部を有する本体２を具備している。この本体２は、略円筒状とする他、臼歯部の抜歯溝での使用状態を考慮すると四角筒状とすることも可能である。
【００２７】
本体２には、少なくとも一部がこの本体２の肉厚部と分離しない図２に示すようなコの字形状のスリット部３を、例えば本体上部に２箇所、本体中央部及び下部に各々２箇所、合計６箇所設けている。本体２の上部の２箇所のスリット部３は、図２の上側に示すように本体２の円周方向に長辺が沿い、本体２の長さ方向に短辺が沿う形状としている。また、本体中央部及び下部に各々２箇所ずつ設けたスリット部３は、図２の下側に示すように本体２の長さ方向に長辺が沿い、本体２の円周方向に短辺が沿う形状としている。尚、スリット部３の部分は外周側から切り込みを入れ、スリット部３を外側へ膨出させ易くするようにすることもできる。また、歯槽骨との密着性を高めるためと、上方からかかる咀嚼による力を分散させるために、本体２の外周に雄ねじ部を設けてもよい。
【００２８】
そして、本体２の上部の２箇所のスリット部３に囲まれる領域を各々本体２の外周面から外方に膨出させて、２個の膨出部４ａ、４ｂとしている。また、本体中央部の２箇所のスリット部３に囲まれる領域を各々本体２の外周面から外方に膨出させて、本体２の上方に向けて開口した２個の膨出部５ａ、５ｂとしている。さらに、本体下部の２箇所のスリット部３に囲まれる領域を各々本体２の外周面から外方に膨出させて、本体２の下方に向けて開口した２個の膨出部６ａ、６ｂとしている。
【００２９】
これら各膨出部４ａ、４ｂ、５ａ、５ｂ、６ａ、６ｂの形状は、コの字形状の他、これと近似した山形状、略半円状、台形状等とすることができる。
【００３０】
前記本体２の内側は、図３に示すように長さ方向或いは円周方向に沿ってテーパー状に加工されている。
【００３１】
このテーパー状の加工について以下に説明する。外形加工をしたインプラント体１の本体２の一方の端部から図３に示すように偏心した孔７ａ、７ｂ、７ｃを他方の端部を貫通する若干手前まで開ける。さらに、孔７ａ、７ｂ、７ｃにより形成される本体２の内周におけるテーパ部８を損なわないようなサイズの孔９を本体２の中心に沿って貫通するように開ける。さらに、３箇所の孔７ａ、７ｂ、７ｃにより形成される本体２の内周におけるテーパ部８を含むような孔（図示せず）をインプラント体１の本体２の上部に開ける。以上の孔加工はドリルでの加工以外にも放電加工等によって行うことも可能である。次に、一番大きな孔の途中まで雌ねじを切る。
【００３２】
次に、前記膨出部４ａ、４ｂ、５ａ、５ｂ、６ａ、６ｂを拡開させる拡開ねじ体１０について図４を参照して説明する。この拡開ねじ体１０の下端はインプラント体１の本体２の下端の孔に嵌合し、拡開ねじ体１０に設けた任意数の凸部１１ｂはインプラント体１の本体２内のテーパー部分に沿って回転し、図５に示すようにテーパー部分を外側へ押し開き、膨出部４ａ、４ｂ、５ａ、５ｂ、６ａ、６ｂを形成する。上端部は本体２の上部の孔に嵌合する。拡開ねじ体１０の上端部に設けた溝１１ａは、手動による回転力を与えるものである。
【００３３】
前記凸部１１ｂの外側面に設けた段部１１ｃは、前記本体２内のテーパー部分の角部１２に係合し、拡開ねじ体１０を定位置に固定する。このようにして、図１に示すような本体２を製造することができる。
【００３４】
膨出部４ａ、４ｂをインプラント体１の上部に設ければ歯槽骨の緻密な部分へ拡開することができ強力な保持力を発揮する。また、膨出部４ａ、４ｂの向きは歯槽骨の薄い患部に対応する短いインプラント体１に使用する事もできる。さらに、臼歯部の抜歯溝のように先端が二つないしは三つに分岐しているような場合、従来の拡張形のインプラント体では対応が不可能であったが、このタイプの短いインプラント体１により臼歯部への適応が可能になる。
【００３５】
前記膨出部６ａ、６ｂのようにインプラント体１の下方向きに設けた場合には、咀嚼時に上方からインプラント体１にかかる力に対して大きな保持力を有することになる。即ち、膨出部６ａ、６ｂの膨出によって骨密度が増した部分が有効に作用すると言える。
【００３６】
次に、本発明の実施の形態２について図６乃至図９を参照して説明する。本実施の形態２のインプラント体１Ａは、略円筒状に形成され、かつ外周にはネジ部のない肉厚部を設け、この肉厚部を貫くコの字形状の任意数のスリット部２２を設け、スリット部２２により囲まれる領域の内周側に例えば上下合計３箇所の受凸部２３を設けた本体２０の内部に、図６及び図７に示すような頭部２５ａを有するとともに外周における前記各受凸部２３に各々対応する位置に上下合計３箇所の膨出凸部２４を設けた拡開ねじ体２５を挿入し、頭部２５ａを回転し、前記受凸部２３を拡開ねじ体２５の膨出凸部２４により外方（インプラント体１Ａの長さ方向、外周方向）に膨出させてスリット部２２により囲まれる領域を任意数の膨出部２７とし、図１に示す場合と同様な形状を有する図７に示すインプラント体１Ａとするものである。前記頭部２５ａの下面と、この頭部２５ａの下面が接合する本体２０の段孔部２０ｂの上面は、密着性（シール性）を確保するために精密な表面加工が施されている。
【００３７】
図８は、前記拡開ねじ体２５に設けた膨出凸部２４による膨出部２７の膨出動作を示すものである。膨出凸部２４は拡開ねじ体２５の軸部２５ａに対して、例えば１８０度対称配置に前記軸部２５ａの直径（Ｄ）よりも大きい突出長（Ｌ）となるように全体として楕円を呈するように形成され、拡開ねじ体２５を図８に示す矢印方向に９０度回転することで、膨出凸部２４の両突出端を対応する受凸部２３に当てて外方に押し出し、スリット部２２により囲まれる領域を膨出部２７とするものである。膨出凸部２４としては、図９に示すような形状、即ち、前記軸部２５ａに対して１８０度対称配置に外方に突出させた段差付きのカム形状で、かつ、外周部にネジ状部２４ａを備えたものを用いる事もできる。この場合、膨出凸部２４により拡開される受凸部２３側にもネジ状部２３ａを設ける事で、拡開ねじ体２５を図８に示す如く矢印ａ方向に９０度回転したとき、膨出凸部２４に受凸部２３に螺合する感じで膨出部２７を形成できる。
【００３８】
尚、インプラント体１Ａに対する加工は、外形加工をしたインプラント体１Ａの一方の端部から内部を貫通する孔を開け、さらにスリット部２２により囲まれる領域の内周側に受凸部２３を設ける。また、放電加工を利用してもインプラント体１Ａの加工を実行できる。
【００３９】
さらにまた、図７に示すように、前記本体２０の一部に抜孔２０ａを設け、拡開ねじ体２５にも貫通孔２８を設けて、緩み止めピン２９を抜孔２０ａから貫通孔２８に挿入する事で、拡開ねじ体２５を定位置に固定して膨出部２７が本体２０側に没入しない構成とする事ができる。この場合、本体２０の段孔部２０ｂの下側の拡開ねじ体２５の外周にウェーブワッシャ（又は皿ばね体）３０を嵌め付け、上述した頭部２５ａの下面と、この頭部２５ａの下面が接合する本体２０の段孔部２０ｂの上面との表面加工と相俟って、拡開ねじ体２５と本体２０との間から細菌等が本体２０内に侵入することを防止している。また、前記緩み止めピン２９と抜孔２０ａとの間、緩み止めピン２９と貫通孔２８との間にも各々円筒状のシール部材を介在するようにすれば本体２０内への細菌等の侵入をより完璧に防止できる。
【００４０】
次に、図１０乃至図１４を参照して本発明の実施の形態３のインプラント体１Ｂについて説明する。このインプラント体１Ｂは、略円筒状に形成されるとともに外周にネジ部のない肉厚部を設けた本体２０を具備し、肉厚部を貫くコの字状の任意数のスリット部３２（図１０において上部側は図１２に示すように本体２０の円周方向、下部側は本体２０の長さ方向）を設ける。また、スリット部３２の下側に、図１４にも示すように雌ねじ３３ｂを有する円筒状で、その外周から１８０度対称配置に最突出端から内方に至る上昇勾配の押上凸部３３ａを設けた押上体３３が挿通可能な空隙部３４（この空隙部３４はスリット部３２の一辺を大きく切り欠くことで形成される）を設けている。
【００４１】
前記膨出部３６Ａ、３６Ｂを形成するには、前記、本体２０に対して、この本体２０の上部から前記空隙部３４に挿通された押上体３３の雌ねじ３３に螺合する雄ねじ体３５を挿入する。そして、雄ねじ体３５を回転させて前記押上体３３を上昇させ、押上体３３の押上凸部３３ａの上昇力を前記スリット部３２により囲まれる領域の内周側に作用させて外方に膨出させ、これにより、上部側は図１１に示すように本体２０の円周方向に膨出する任意数の膨出部３６Ａとし、下部側は本体２０の長さ方向の斜め下方に膨出する膨出部３６Ｂとし、これによりインプラント体１Ｂを形成するものである。この場合、前記雄ねじ体３５の頭部３５ａの外周の下面３５ｂと、本体２０の孔段部２０ｂの上面とは、密着性（シール性）を確保するために精密な表面加工が施され、雄ねじ体３５の頭部３５ａの外周から本体２０内への細菌等の侵入を防止している。
【００４２】
図１３は、本体２０の円周方向に膨出して形成される前記膨出部３６Ａの形状を示すものであり、この膨出部３６Ａは、上部が薄く下部が厚く形成されるとともに、その内周側において最下端から斜め上方に向かって最も側方に突出した稜線３７を有し、前記押上体３３の押上凸部３３ａが上昇するとき、押上凸部３３ａの傾斜面が常に稜線３７に沿って接触するようにして、膨出部３６Ａを円周方向に膨出させるものである。
【００４３】
図１５、図１６は、前記インプラント体１の使用例を概略的に示すものであり、図１に示すように、上向きの膨出部５ａ、５ｂと、下向きの膨出部６ａ、６ｂとを有するインプラント体１を使用し、これらを隣接して膨出部５ａ、５ｂ、膨出部６ａ、６ｂの位置を調整しつつ抜歯溝４０に植立することにより、これらが互いに干渉することなく抜歯溝４０に高密度で植立することが可能となる。
【００４４】
また、インプラント体１の任意の箇所から図１に示すような膨出部４ａ、４ｂ、５ａ、５ｂを膨出させることで、図１６に示すように不定型な抜歯溝４０にもこのインプラント体１を埋め込むことができる。
【００４５】
以上説明した本実施の形態によれば、抜歯溝へのインプラント体１の植立が可能となり、以下の説明のようにインプラント体１の適応症例を飛躍的に拡大させる。即ち、通常咀嚼により歯牙からの力により歯槽骨がわずかに歪み、微少な電位が歯槽骨に生じる。この電位に血液中のカルシウムイオンが引き寄せられ、歯糟骨ヘのカルシウム成分の補給を行っている。
【００４６】
従来のインプラント体では抜歯溝が完全に塞がるのを待つ必要があったが、この間には抜歯部の歯槽骨には充分なカルシウム成分は供給されない。また、抜歯溝を周辺の骨成分が埋めようとするので歯槽骨が薄く脆弱になり、インプラント体が植立できないケースが上顎で約８０％、下顎で３０％あるのがインプラント体を処置する際の最大のネックであった。
【００４７】
本実施の形態では、抜歯溝ヘインプラント体１（インプラント体１Ａ、１Ｂも同様、以下同じ）を植立してもインプラント体１の上下各部に膨出部４ａ、５ａ、６ａ等を設けることができのるで、埋め込みの為の抜歯部等の穴が完全な円で無くても良く、抜歯直後に前記インプラント体１を歯槽骨へ植立することが可能となる。
【００４８】
従って、インプラント体１の不適合な症例は極めて限られたケースとなる。抜歯溝は不定形であり、従って従来の非拡張形インプラント体を埋め込むのは不可能である。また、従来の拡張形インプラント体もこのインプラント体の下部のみしか拡張しないため不可能であった。本本実施の形態によれば、インプラント体１の各所を膨出できるので、不定型な抜歯溝にもインプラント体１を埋め込むことができる。
【００４９】
現在、インプラント体１を扱う術者はごく限られた人数しかいない。その主な原因は、歯槽骨に穴を開けるという高度な技術を要求されるためである。穴の深さ、方向に細心の注意を払わなければ、直ちに医療事故につながる事態が生じるが、抜歯溝がそのままインプラント体１の埋め込みのための穴として利用できるのであれば遥かに容易に、そして安全にインプラント体１の植立を行うことが可能となる。
【００５０】
さらに、本実施の形態のインプラント体１によれば、抜歯溝の複数箇所に膨出部を当てて支持できるので、インプラント体１に作用する曲げモーメントに対しても従来例の場合よりも強くなるという利点がある。
【００５１】
【発明の効果】
本発明によれば、従来のインプラント体に比較して植立直後から強力な保持力を発揮し、即日の上部構造の構築が可能であり、歯槽骨が薄くなることを防止することもできるインプラント体を提供することができる。
【００５３】
また、本発明によれば、上記効果を奏するインプラント体を簡略な工程で形成できるとともに、本体内への細菌等の侵入を防止することも可能なインプラント体の形成方法を提供することができる。
【図面の簡単な説明】
【図１】本発明の実施の形態１のインプラント体を示す正面図である。
【図２】本発明の実施の形態１のインプラント体におけるスリット部の方向を示す説明図である。
【図３】本発明の実施の形態１のインプラント体の加工状態を示す図である。
【図４】本発明の実施の形態１のインプラント体の拡開ねじ体を示す斜視図である。
【図５】本発明の実施の形態１のインプラント体の製造工程を示す図である。
【図６】本発明の実施の形態２のインプラント体の本体を示す断面図である。
【図７】本発明の実施の形態２のインプラント体を示す断面図である。
【図８】本実施の形態２のインプラント体の膨出凸部の動作を示す説明図である。
【図９】本実施の形態２のインプラント体の膨出凸部の他例を示す説明図である。
【図１０】本発明の実施の形態３のインプラント体を示す断面図である。
【図１１】本発明の実施の形態３のインプラント体を示す断面図である。
【図１２】本実施の形態３のインプラント体の膨出部を示す部分斜視図である。
【図１３】本実施の形態３のインプラント体の膨出部の拡大図である。
【図１４】本実施の形態３のインプラント体の押上体を示す斜視図である。
【図１５】本発明の実施の形態１のインプラント体の使用例を示す概略図である。
【図１６】本発明の実施の形態１のインプラント体の他の使用例を示す概略図である。
【図１７】従来のインプラント体の一例を示す正面図である。
【符号の説明】
１インプラント体
１Ａインプラント体
１Ｂインプラント体
２本体
３スリット部
４ａ膨出部
４ｂ膨出部
５ａ膨出部
５ｂ膨出部
６ａ膨出部
６ｂ膨出部
８テーパ部
１０拡開ねじ体
１１ｂ凸部
２０本体
２２スリット部
２３受凸部
２５拡開ねじ体
２７膨出部[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method of forming the implant body and the implant body used in the field of dental technology.
[0002]
[Prior art]
Conventionally, in the field of dental technicians who implant and fix an implant body in the alveolar bone, after implanting the implant body in the alveolar bone, the gingiva of that part is sutured again and waits for about several years, and the alveolar bone grows Thus, the implant body and the alveolar bone are firmly fixed.
[0003]
FIG. 17 shows a conventional expanded implant body 50. In this implant body 50, an expansion body 52 is lifted on the inner peripheral portion of the main body 51 having a slit 55 in the lower portion by using the rotational force of the screw body 53, and opened to the left and right at the lower portion of the main body 51. Is formed.
[0004]
[Problems to be solved by the invention]
However, in the case of the prior art shown in FIG. 17, a cavity is formed in the lower portion of the expanded portion 51a, and does not show a large resistance to the force from the upper portion. Moreover, since the surrounding bone component fills this cavity, the bone density at the distal end portion of the expanded portion 51a becomes extremely thin. In addition, it can be said that the portion having a high bone density caused by the expansion of the expanded portion 51 a does not contribute to the holding force of the implant body 50.
[0005]
In the case of the prior art, generally speaking, once the implant body is planted in the alveolar bone, the gingiva of the implant section of the implant body is incised again, the upper part of the implant body is exposed, and the subsequent work is performed. There was a need to continue. The patient does not recover his mastication function for half a year and is forced to have an inconvenient life. In addition, the patient suffers from physical pains incising the planted portion of the implant again after half a year.
[0006]
That is, the conventional implant body cannot be planted in the extraction groove immediately after extraction. There are individual differences in the shape of the extraction groove, and even if a cylindrical implant body is planted in the extraction groove, it is impossible to fix the fixation portion with few contact portions with the alveolar bone. Therefore, it has been necessary to wait for several years after the tooth extraction until the tooth extraction groove is completely removed, but it is known that the alveolar bone becomes thinner after the tooth extraction groove. For this reason, the case where the planting of the implant body itself is difficult has frequently occurred.
[0007]
Conventionally, a technique for mechanically expanding a part of the implant body immediately after being buried in the alveolar bone has also been proposed. There was a problem that a fixing force could not be obtained.
[0008]
In addition, in the case of this conventional technique, since a cavity is formed in the alveolar bone when the part of the implant body is expanded, there is a risk that the alveolar bone becomes thin.
[0009]
The present invention has been made in view of the above circumstances, and has improved the holding force between the tooth extraction groove and the like, and can form an artificial tooth that can be used on the same day, and a method for forming the implant body The purpose is to provide.
[0010]
[Means for Solving the Problems]
The implant body according to claim 1 of the present invention is provided with an arbitrary number of slits for forming the bulging portion penetrating through the thick portion, a substantially cylindrical main body having no threaded portion on the outer periphery of the thick portion, and the main body An expanded screw body that forms a bulged portion defined by the shape of the slit portion bulged outward from the outer periphery of the main body with the slit portion as a boundary. Of the slit part for forming the part, the upper part of the main body is surrounded by the slit part at the upper part of the main body and the bulging part is swelled along the circumferential direction from the outer peripheral surface of the main body. The area surrounded by the slit portion is bulged outward from the outer peripheral surface of the main body, and the lower portion of the main body is bulged outward from the outer peripheral surface. A bulging portion that opens downward from the main body and A plurality of holes having a tapered portion eccentric from one end portion to the other end portion are opened, and a hole having a size that does not impair the tapered portion of each hole is formed in the center of the main body. The projecting portion of the expanding screw body is rotated along with the tapered portion of each hole of the main body by rotating while inserting the expanding screw body inside the main body. Rotate, engage the step of each convex part of the expanding screw body with the corner of each tapered part of the main body, and fix the expanding screw body at a fixed position in the main body. It is characterized by forming each bulging portion.
[0011]
According to the implant body of claim 1 of the present invention , since the bulging portion bulges in the upper part, the central part and the lower part of the main body , when this implant body is planted in the tooth extraction groove, And strong holding power. Therefore, compared with the conventional implant body, a strong holding force is exhibited immediately after the planting, the superstructure of the same day can be constructed, and the immediate mastication function is restored. In addition, it is possible to plant using an extraction groove, and it is possible to prevent the alveolar bone from becoming thin due to the extraction groove.
[0012]
The implant body according to claim 2 of the present invention is the implant body according to claim 1, wherein each of the bulging portions is bulged outward from the outer peripheral surface of the main body with the slit portions as boundaries. It is characterized by comprising a bulge portion having a U-shape defined by the slit portion or a shape approximate to a U-shape.
[0014]
According to this invention, a part of the implant body is utilized in the central portion and the lower portion of the main body along the length direction by utilizing a bulge portion having a U-shape or a shape approximate to a U-shape. is bulged upward and downward Te Rutotomoni, in the upper part of the body, in order to bulge along its circumference, it can exert a strong holding force against the force from any direction applied to the implant body. Therefore, compared with the conventional implant body, a strong holding force is exhibited immediately after the planting, the superstructure of the same day can be constructed, and the immediate mastication function is restored. In addition, it is possible to plant using an extraction groove, and it is possible to prevent the alveolar bone from becoming thin due to the extraction groove.
[0017]
Moreover, the implant body of the invention according to claim 3 of the present invention is formed in a substantially cylindrical shape, provided with a slit portion for forming a bulging portion that penetrates the thick portion, and on the inner peripheral side of the region surrounded by the slit portion. The expansion screw body is inserted into the inside of the main body provided with the receiving convex portion and rotated, and the receiving convex portion is bulged outward by the bulging convex portion provided on the expanding screw body and surrounded by the slit portion. The region to be formed is a bulging portion.
[0018]
According to the invention of claim 3, based on the simple process of rotating operation of the expansion open threaded body,受凸portion of said body to bulge outward by the bulging protrusions provided on the expansion screw body As a result, the region surrounded by the slit portion can be the bulging portion.
[0019]
Moreover, the implant body according to claim 4 of the present invention is formed in a substantially cylindrical shape, and is provided with a thick portion without a screw portion on the outer periphery , and a slit portion for forming a bulge portion that penetrates the thick portion. Furthermore , with respect to a main body provided with a gap portion through which a push-up body having an internal thread and a push-up convex portion protruding outward is provided on the lower side of the slit portion, the gap portion is formed from above the main body. The male screw body to be screwed into the female screw of the push-up body inserted through is inserted, the male screw body is rotated to raise the push-up body, and the region surrounded by the slit portion is pushed outward through the push-up convex portion of the push-up body And an arbitrary number of bulging portions.
[0020]
According to this invention, the implant body that exhibits the action as described in the first aspect of the invention can be formed by a simple process of raising the push-up body by the rotation of the male screw body.
[0021]
Method for forming an implant body of the invention of claim 5, wherein the present invention is formed in a substantially cylindrical shape, and a thick portion having no threaded portion provided on the outer periphery, slits for bulging portion formed to penetrate the thick portion the section provided further on the lower side of the slit portions, with respect to the body of the push-up member having a push-up protruding portion protruding outward is provided can be inserted void portion and having an internal thread, the gap from the top of the body Inserting a male screw body having a screw part and a head to be screwed into the female screw of the push-up body inserted through the part, rotating the male screw body to raise the push-up body, and passing the slit through the push-up convex part of the push-up body The region surrounded by the portion is bulged outward to form an arbitrary number of bulged portions, and the head region of the male screw body and the corresponding portion of the main body are sealed.
[0022]
According to the present invention, as in the case of the invention of the fourth aspect, the implant body that exhibits the action as in the first aspect of the invention is formed by a simple process of raising the push-up body by the rotation of the male screw body. In addition, since the head region of the male screw body and the corresponding portion of the main body are sealed, it is possible to prevent invasion of bacteria and the like from the gap between the head region of the male screw body and the main body. it can.
[0025]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail.
[0026]
1 to 5 show an implant body 1 and a method for forming the implant body 1 according to Embodiment 1 of the present invention. An implant body 1 shown in FIG. 1 is formed in a substantially cylindrical shape by coating apatite or the like on titanium or stainless steel using a material having a good affinity for a living body , and has a thick part without a screw part on the outer periphery. A main body 2 is provided. The main body 2 can be formed into a rectangular tube shape in consideration of the use state in the extraction groove of the molar portion in addition to the substantially cylindrical shape.
[0027]
The main body 2 has U-shaped slit portions 3 as shown in FIG. 2 that are not separated at least partially from the thick portion of the main body 2, for example, two at the upper portion of the main body and two at the central portion and lower portion of the main body. There are 6 places in total. As shown in the upper side of FIG. 2, the two slit portions 3 at the upper part of the main body 2 have long sides along the circumferential direction of the main body 2 and short sides along the length direction of the main body 2. Moreover, the slit part 3 provided in two places each in the center part and lower part of a main body has a long side along the length direction of the main body 2, and a short side in the circumferential direction of the main body 2 as shown in the lower side of FIG. The shape is in line. The slit portion 3 may be cut from the outer peripheral side so that the slit portion 3 can be easily bulged outward. Moreover, in order to improve the adhesiveness with the alveolar bone and to disperse the force due to the mastication from above, an external thread portion may be provided on the outer periphery of the main body 2.
[0028]
And the area | region enclosed by the two slit parts 3 of the upper part of the main body 2 is bulged outward from the outer peripheral surface of the main body 2, respectively, and it is set as the two bulging parts 4a and 4b. In addition, two bulging portions 5 a and 5 b that open toward the upper side of the main body 2 by bulging outwardly from the outer peripheral surface of the main body 2 each of the regions surrounded by the two slit portions 3 in the central portion of the main body. It is said. Further, two bulging portions 6 a and 6 b opened outwardly from the outer peripheral surface of the main body 2, respectively, and bulging outward from the outer peripheral surface of the main body 2. Yes.
[0029]
The bulging portions 4a, 4b, 5a, 5b, 6a, and 6b may have a U-shape, a mountain shape approximated thereto, a substantially semicircular shape, a trapezoidal shape, or the like.
[0030]
As shown in FIG. 3, the inside of the main body 2 is processed into a taper shape along the length direction or the circumferential direction.
[0031]
This tapered processing will be described below. As shown in FIG. 3, the eccentric holes 7a, 7b, and 7c are opened from one end of the body 2 of the implant body 1 that has undergone the outer shape processing to slightly before penetrating the other end. Further, a hole 9 having a size that does not impair the tapered portion 8 on the inner periphery of the main body 2 formed by the holes 7 a, 7 b, and 7 c is opened so as to penetrate along the center of the main body 2. Further, a hole (not shown) including the tapered portion 8 on the inner periphery of the main body 2 formed by the three holes 7a, 7b, and 7c is formed in the upper portion of the main body 2 of the implant body 1. The above drilling can be performed by electric discharge machining or the like in addition to drilling. Next, cut the internal thread halfway through the largest hole.
[0032]
Next, the expanding screw body 10 for expanding the bulging portions 4a, 4b, 5a, 5b, 6a, 6b will be described with reference to FIG. The lower end of the expanding screw body 10 is fitted into a hole at the lower end of the main body 2 of the implant body 1, and an arbitrary number of convex portions 11 b provided on the expanding screw body 10 are formed in a tapered portion in the main body 2 of the implant body 1. And the taper portion is pushed outward as shown in FIG. 5 to form the bulging portions 4a, 4b, 5a, 5b, 6a and 6b. The upper end fits into the hole in the upper part of the main body 2. The groove 11a provided in the upper end portion of the expansion screw body 10 gives a manual rotational force.
[0033]
A step portion 11c provided on the outer surface of the convex portion 11b engages with a corner portion 12 of the tapered portion in the main body 2 to fix the expanding screw body 10 in a fixed position. In this way, the main body 2 as shown in FIG. 1 can be manufactured.
[0034]
If the bulging parts 4a and 4b are provided in the upper part of the implant body 1, it can be expanded to a dense part of the alveolar bone and exhibits a strong holding force. Moreover, the direction of the bulging parts 4a and 4b can also be used for the short implant body 1 corresponding to the affected part with a thin alveolar bone. Furthermore, when the tip is branched into two or three like the extraction groove of the molar part, it was impossible to cope with the conventional expanded implant body, but this type of short implant body 1 enables adaptation to the molar part.
[0035]
When the implant body 1 is provided in the downward direction like the bulging portions 6a and 6b, it has a large holding force with respect to the force applied to the implant body 1 from above during mastication. That is, it can be said that the portion where the bone density is increased by the bulging of the bulging portions 6a and 6b is effective.
[0036]
Next, a second embodiment of the present invention will be described with reference to FIGS. The implant body 1A according to the second embodiment is formed in a substantially cylindrical shape and is provided with a thick portion without a screw portion on the outer periphery , and an arbitrary number of U-shaped slit portions 22 penetrating the thick portion. The head 20a as shown in FIGS. 6 and 7 is provided inside the main body 20 provided with, for example, a total of three convex and concave portions 23 on the inner peripheral side of the region surrounded by the slit portion 22, and at the outer periphery. The expansion screw body 25 provided with a total of three bulging protrusions 24 in the upper and lower positions is inserted into positions corresponding to the receiving protrusions 23, the head 25a is rotated, and the receiving protrusions 23 are expanded. In the case shown in FIG. 1, the region surrounded by the slit portion 22 is bulged outward (in the length direction of the implant body 1A, the outer peripheral direction) by the bulging convex portion 24 of the body 25, and is shown in FIG. The implant body 1A shown in FIG. Than is. The lower surface of the head portion 25a and the upper surface of the stepped hole portion 20b of the main body 20 to which the lower surface of the head portion 25a is joined are subjected to precise surface processing to ensure adhesion (sealability).
[0037]
FIG. 8 shows the bulging operation of the bulging portion 27 by the bulging convex portion 24 provided on the expanding screw body 25. The bulging convex portion 24 has an elliptical shape as a whole so as to have a projecting length (L) larger than the diameter (D) of the shaft portion 25a, for example, in a 180 degree symmetrical arrangement with respect to the shaft portion 25a of the expanding screw body 25. By rotating the expanding screw body 25 by 90 degrees in the direction of the arrow shown in FIG. 8, both projecting ends of the bulging convex portion 24 are applied to the corresponding receiving convex portions 23 and pushed outward. A region surrounded by the slit portion 22 is a bulge portion 27. The bulging convex portion 24 has a shape as shown in FIG. 9, that is, a cam shape with a step projecting outwardly in a 180 degree symmetrical arrangement with respect to the shaft portion 25a, and a screw shape on the outer peripheral portion. The thing provided with the part 24a can also be used. In this case, by providing the screw-like portion 23a also on the receiving convex portion 23 side expanded by the bulging convex portion 24, when the expansion screw body 25 is rotated 90 degrees in the direction of arrow a as shown in FIG. The bulging portion 27 can be formed so as to be screwed into the bulging convex portion 24 and the receiving convex portion 23.
[0038]
In the processing of the implant body 1A, a hole penetrating the inside is formed from one end portion of the implant body 1A subjected to the outer shape processing, and a receiving convex portion 23 is provided on the inner peripheral side of the region surrounded by the slit portion 22. Further, the machining of the implant body 1A can be executed even by using electric discharge machining.
[0039]
Furthermore, as shown in FIG. 7, a hole 20a is provided in a part of the main body 20, a through hole 28 is provided in the expansion screw body 25, and a locking pin 29 is inserted into the through hole 28 from the hole 20a. Thus, the expanding screw body 25 can be fixed at a fixed position so that the bulging portion 27 does not enter the main body 20 side. In this case, a wave washer (or a disc spring body) 30 is fitted to the outer periphery of the expanding screw body 25 on the lower side of the stepped hole portion 20b of the main body 20, and the lower surface of the head 25a described above and the lower surface of the head 25a. In combination with the surface processing of the upper surface of the stepped hole portion 20b of the main body 20 to be joined, bacteria and the like are prevented from entering the main body 20 from between the expanding screw body 25 and the main body 20. Further, if a cylindrical sealing member is interposed between the locking pin 29 and the hole 20a and between the locking pin 29 and the through hole 28, bacteria and the like enter the main body 20. It can be prevented more perfectly.
[0040]
Next, an implant body 1B according to Embodiment 3 of the present invention will be described with reference to FIGS. The implant body 1B is provided with a body 20 having a thick portion having no threaded portion Rutotomoni outer periphery is formed in a substantially cylindrical shape, the slit portion 32 (FIG any number shaped co penetrating the thick portions 10, the upper side is provided with a circumferential direction of the main body 20 as shown in FIG. 12, and the lower side is provided with a length direction of the main body 20. Further, on the lower side of the slit portion 32, as shown in FIG. 14, a cylindrical shape having a female thread 33b is provided, and a push-up convex portion 33a having a rising gradient from the outermost end to the inside is provided in a 180 ° symmetrical arrangement from the outer periphery. Further, there is provided a gap portion 34 through which the push-up body 33 can be inserted (the gap portion 34 is formed by greatly cutting one side of the slit portion 32).
[0041]
In order to form the bulging portions 36A and 36B, a male screw body 35 is inserted into the main body 20 so as to be screwed into the female screw 33 of the push-up body 33 inserted into the gap portion 34 from above the main body 20. To do. Then, the male screw body 35 is rotated to raise the push-up body 33, and the lifting force of the push-up convex portion 33a of the push-up body 33 is applied to the inner peripheral side of the region surrounded by the slit portion 32 to bulge outward. Accordingly, as shown in FIG. 11, the upper side is an arbitrary number of bulging portions 36A that bulge in the circumferential direction of the main body 20, and the lower side is a bulging that bulges obliquely downward in the length direction of the main body 20. The protruding portion 36B is used to form the implant body 1B. In this case, the lower surface 35b of the outer periphery of the head portion 35a of the male screw body 35 and the upper surface of the hole step portion 20b of the main body 20 are subjected to precise surface processing to ensure adhesion (sealability). Bacteria and the like are prevented from entering the main body 20 from the outer periphery of the head 35a of the body 35.
[0042]
FIG. 13 shows the shape of the bulging portion 36A formed by bulging in the circumferential direction of the main body 20, and this bulging portion 36A is formed with a thin upper portion and a thick lower portion. On the circumferential side, it has a ridge line 37 that protrudes most laterally from the lowest end toward the upper side, and when the push-up convex part 33a of the push-up body 33 rises, the inclined surface of the push-up convex part 33a always follows the ridge line 37. In this way, the bulging portion 36A bulges in the circumferential direction.
[0043]
FIGS. 15 and 16 schematically show an example of use of the implant body 1. As shown in FIG. 1, upward bulging portions 5a and 5b and downward bulging portions 6a and 6b are provided. The implant body 1 is used, and these are placed adjacent to each other in the tooth extraction groove 40 while adjusting the positions of the bulging portions 5a and 5b and the bulging portions 6a and 6b. It becomes possible to plant in the groove 40 with high density.
[0044]
Further, the bulging portions 4a, 4b, 5a, and 5b as shown in FIG. 1 are bulged from an arbitrary portion of the implant body 1, so that the irregular tooth extraction groove 40 as shown in FIG. 1 can be embedded.
[0045]
According to this Embodiment demonstrated above, the implant body 1 can be planted to a tooth extraction groove | channel, and the application case of the implant body 1 is expanded greatly like the following description. That is, the alveolar bone is slightly distorted by the force from the teeth during normal chewing, and a slight potential is generated in the alveolar bone. Calcium ions in the blood are attracted to this potential, and calcium components are supplied to the calcaneus.
[0046]
In the conventional implant body, it was necessary to wait for the extraction groove to be completely blocked, but during this time, a sufficient calcium component is not supplied to the alveolar bone of the extraction portion. In addition, because the surrounding bone components try to fill the tooth extraction groove, the alveolar bone becomes thin and fragile, and about 80% of the upper jaw and 30% of the lower jaw have a case where the implant body cannot be implanted. Was the biggest neck.
[0047]
In the present embodiment, the bulging portions 4a, 5a, 6a and the like may be provided at the upper and lower portions of the implant body 1 even when the implant body 1 (the same applies to the implant bodies 1A and 1B) is implanted in the tooth extraction groove. As a result, a hole such as a tooth extraction portion for embedding does not have to be a perfect circle, and the implant body 1 can be implanted into the alveolar bone immediately after tooth extraction.
[0048]
Therefore, there are very limited cases where the implant body 1 is incompatible. The extraction groove is irregular, so it is impossible to embed a conventional non-expandable implant body. Further, the conventional expandable implant body is impossible because only the lower part of the implant body is expanded. According to the present embodiment, since various portions of the implant body 1 can be swelled, the implant body 1 can be embedded in an irregular tooth extraction groove.
[0049]
At present, there are only a limited number of surgeons who handle the implant body 1. The main cause is that a high technique of making a hole in the alveolar bone is required. If careful attention is not paid to the depth and direction of the hole, there will be a situation that will immediately lead to a medical accident, but it will be much easier if the extraction groove can be used as a hole for implanting the implant body 1 as it is, and It becomes possible to plant the implant body 1 safely.
[0050]
Furthermore, according to the implant body 1 of the present embodiment, since the bulging portions can be applied to and supported at a plurality of locations of the extraction groove, the bending moment acting on the implant body 1 is also stronger than in the conventional example. There is an advantage.
[0051]
【The invention's effect】
According to the present invention, an implant that exhibits a strong holding force immediately after planting as compared to a conventional implant body, can construct the superstructure of the same day, and can also prevent the alveolar bone from becoming thin. The body can be provided.
[0053]
In addition, according to the present invention, it is possible to provide a method for forming an implant body that can form an implant body that exhibits the above-described effects by a simple process and can also prevent bacteria and the like from entering the main body.
[Brief description of the drawings]
FIG. 1 is a front view showing an implant body according to a first embodiment of the present invention.
FIG. 2 is an explanatory view showing the direction of the slit portion in the implant body according to the first embodiment of the present invention.
FIG. 3 is a diagram showing a processing state of the implant body according to the first embodiment of the present invention.
FIG. 4 is a perspective view showing an expanding screw body of the implant body according to the first embodiment of the present invention.
FIG. 5 is a diagram showing manufacturing steps of the implant body according to the first embodiment of the present invention.
FIG. 6 is a cross-sectional view showing a main body of an implant body according to a second embodiment of the present invention.
FIG. 7 is a sectional view showing an implant body according to a second embodiment of the present invention.
FIG. 8 is an explanatory view showing the operation of the bulging convex portion of the implant body according to the second embodiment.
FIG. 9 is an explanatory view showing another example of the bulging convex portion of the implant body according to the second embodiment.
FIG. 10 is a cross-sectional view showing an implant body according to a third embodiment of the present invention.
FIG. 11 is a sectional view showing an implant body according to a third embodiment of the present invention.
FIG. 12 is a partial perspective view showing a bulging portion of the implant body according to the third embodiment.
FIG. 13 is an enlarged view of a bulging portion of the implant body according to the third embodiment.
FIG. 14 is a perspective view showing a push-up body of the implant body according to the third embodiment.
FIG. 15 is a schematic view showing a usage example of the implant body according to the first embodiment of the present invention.
FIG. 16 is a schematic view showing another example of use of the implant body according to the first embodiment of the present invention.
FIG. 17 is a front view showing an example of a conventional implant body.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Implant body 1A Implant body 1B Implant body 2 Main body 3 Slit part 4a Swelling part 4b Swelling part 5a Swelling part 5b Swelling part 6a Swelling part 6b Swelling part 8 Taper part 10 Expanding screw body 11b Convex part 20 Main body 22 Slit part 23 Receiving convex part 25 Expanding screw body 27 Swelling

Claims

Provide a slit portion for forming an arbitrary number of bulging portions that penetrate the thick portion, and a substantially cylindrical main body without a screw portion on the outer periphery of the thick portion ,
In an implant body comprising an expanded screw body that forms a bulging portion defined by the shape of the slit portion bulging outward from the outer periphery of the main body with the slit portion of the main body as a boundary,
Of the slits for forming the bulging part of the main body, the upper part of the main body has a bulging part formed by bulging a region surrounded by the slit part from the outer peripheral surface of the main body along the circumferential direction, and a central part of the main body The area surrounded by the slit portion is bulged outward from the outer peripheral surface, and the bulging portion that opens upward from the main body and the lower portion of the main body are located outside the outer peripheral surface of the main body. And a plurality of holes provided with a tapered portion eccentric from one end to the other end on the inside of the main body, and a bulging portion that opens toward the lower side of the main body is provided, In addition, the center of the main body is formed by opening a hole having a size that does not impair the tapered portion of each hole, and the expansion screw body is rotated while being inserted inside the main body. By doing so, each convex part of the spread screw body is made to correspond to each hole of the main body. Rotate along the super section, engage the step of each convex part of the expansion screw body with the corner of each taper part of the main body, and place the expansion screw body in a fixed position in the main body An implant body configured by forming each bulging portion of the main body while being fixed.

Each of the bulging portions bulges outward from the outer peripheral surface of the main body with each slit as a boundary, and has a U-shape or a shape approximate to a U-shape defined by each of the slit portions. The implant body according to claim 1, wherein the implant body is constituted by a protruding portion.

Expanded inside the main body, which is formed in a substantially cylindrical shape, provided with an arbitrary number of slits for forming the bulging part that penetrates the thick part, and provided with a receiving convex part on the inner peripheral side of the area surrounded by the slit part The screw body is inserted and rotated, and the receiving convex portion is bulged outward by the bulging convex portion provided on the expanding screw body, and the region surrounded by the slit portion is used as the bulging portion. Implant body characterized by.

Is formed in a substantially cylindrical shape, and a thick portion having no threaded portion provided on the outer circumference, the slit portion of the bulging portion formed to penetrate the thick portion is provided, further to the lower side of the slit portion, and having a female thread A male screw body that is screwed into the female screw of the push-up body inserted through the gap from the upper part of the main body is inserted into the main body provided with a gap portion through which the push-up body having an upwardly protruding convex portion can be inserted. Then, the male screw body is rotated to raise the push-up body, and the region surrounded by the slit portion is bulged outwardly via the push-up convex portion of the push-up body to form an arbitrary number of bulge portions. An implant body characterized by that.

Is formed in a substantially cylindrical shape, and a thick portion having no threaded portion provided on the outer circumference, the slit portion of the bulging portion formed to penetrate the thick portion is provided, further to the lower side of the slit portion, and having a female thread For a main body provided with a gap portion through which the push-up body having an upward protrusion projecting outward can be inserted, a screw portion and a head that are screwed into the female screw of the push-up body inserted from the upper portion of the main body into the gap portion The male screw body having a portion is inserted, the male screw body is rotated to raise the push-up body, and the region surrounded by the slit portion is bulged outwardly via the push-up convex portion of the push-up body, and an arbitrary number of swellings are made. A method for forming an implant body, characterized in that a projecting portion is formed and a head region of the male screw body and a corresponding portion of the main body are sealed.