JP4963280B2 - 漸増的に歯を移動させるための方法およびシステム - Google Patents
漸増的に歯を移動させるための方法およびシステム Download PDFInfo
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Description
1.発明の分野
本発明は、一般的に、歯列矯正学の分野に関する。より詳細には、本発明は、最初の歯列から最終的な歯列へと漸増的に歯を移動させるシステムおよび方法に関する。
2.背景技術の説明
歯列矯正治療を完成させるための歯の位置決め具は、Am.J.Orthod.Oral.Surg.31:297−304ページ(1945)および32:285−293ページ(1946)においてKeslingにより記載されている。患者の歯の包括的な歯列矯正的再配列のためのシリコン位置決め具は、WarunekらがJ.Clin.Orthod.23:694−700ページ(1989)に記載している。歯の位置を完成させ維持するための透明プラスチック維持装置は、70125ルイジアナ州ニューオリンズのRaintree Essix,Inc.および55902ミネソタ州ロチェスターのTru−Tain Plasticsから市販されている。歯列矯正位置決め具の製作は、米国特許第5,186,623号、第5,059,118号、第5,055,039号、第5,035,613号、第4,856,991号、第4,798,534号、第4,755,139号に記載されている。
削合する方法を記載している。米国特許第5,607,305号および第5,587,912号には、歯の輪郭のデジタルコンピュータ操作が記載されている。米国特許第5,342,202号および第5,340,309号には、顎のコンピュータ化されたデジタル撮像が記載されている。他の関連特許は、米国特許第5,549,476号、第5,382,164号、第5,273,429号、第4,936,862号、第3,860,803号、第3,660,900号、第5,645,421号、第5,055,039号、第4,798,534号、第4,856,991号、第5,035,613号、第5,059,118号、第5,186,623号、および第4,755,139号を含む。
本発明は、最初の歯列から最終的な歯列に歯を再配置するための改良された方法およびシステムを提供する。再配置は、凹部において歯を受け止め、少なくとも3つの逐次的工程の連続において、通常は少なくとも4つの逐次的工程を含み、しばしば少なくとも10の工程を含み、ときに少なくとも25の工程を含み、希に40以上の工程を含んで、それぞれの歯を漸増的に再配置するように構成された凹部を有する一連の器具を含むシステムによって達成される。最も頻繁には、本方法およびシステムは、10から25の逐次的工程において歯を再配置するが、患者の歯の多くに関わる複雑な場合には、40以上の工程を取り得る。多くのそのような器具の逐次的使用は、各器具が個々の歯を、典型的には2mm未満、好適には1mm未満、より好適には0.5mm未満の、小さな漸増において動かす構成であることを可能にする。これらの限定は、単一の器具を用いた際の、歯の任意点の最大限線形移動を基準としている。もちろん、逐次的器具により提供される動きは通常、任意の特定の歯に対して同一ではない。従って、歯の一点は一つの器具の使用の結果として、特定の距離に動かされ得、その後、その後の器具により、異なる距離および/または異なる方向に動かされ得る。
いるかを確認するために定期的に治療専門家を訪れることを望むが、調節が行われるたびに治療専門家を訪れる必要性を排除することによって、より多くの回数で、少量ずつの逐次的工程において治療を行うことが可能になり、それでもなお、個々の患者に治療専門家が掛ける時間を低減できる。さらに、より快適で、目立ちにくく、患者が取り外せる重合体のシェル装着を使用できることで、患者の追従(compliance)、快適さ、満足を大幅に改善する。
の分散的歯列を表す複数のデジタルデータ組を作成することを提供する。そのような方法は、最初の歯列を表すデジタルデータ組の提供を含む(これは、上述の任意の技術により達成し得る)。最終的歯列を表すデジタルデータ組も提供される。そのような最終デジタルデータ組は、先述した方法により決定され得る。次に、複数の逐次的デジタルデータ組が、最初のデジタルデータ組および最終的デジタルデータ組に基づき作成される。通常、逐次的デジタルデータ組は、選択された個別の歯の最初のデータ組と最終的データ組との間の位置的差を規定し、その差を補間することにより作成される。そのような補間は、通常少なくとも3つ、しばしば少なくとも4つ、より頻繁には少なくとも10、ときに少なくとも25、希に40以上の、望まれる限り多くの分散段階を介して実施され得る。多くの場合、補間は、位置的差のいくつか、またはすべてに対する線形補間である。あるいは、補間は非線形であり得る。好適な実施形態では、非線形補間は、個々の歯の干渉を避けるために経路計画および衝突検出技術を用いたコンピュータにより自動的に計算される。位置的差は、歯の任意の点における最大線形移動が2mm以下、通常1mm以下、しばしば0.5mm以下である、歯の移動に対応する。
図1Aは、患者の顎を示し、本発明の方法および器具によっていかに歯を動かすことができるかを概説する。
ートである。
本発明によると、複数の別個の器具を用いて漸増的に歯を動かすシステムおよび方法が提供される。各器具は、比較的小さな量ずつ、一つ以上の患者の歯を漸次的に動かす。歯の移動は、歯列矯正治療に標準的に関連するものであって、鉛直の中央線に対する3軸方向すべてにおける移動、2つの歯列矯正方向(根の角度および捻り)への歯の中央線の回転、および中央線(CL)に対する回転を含む。
べての、または殆どすべての歯を同時に再配置することができる。
Edition,Saunders,Philadelphia,1969,401から415ページに記載されているような周知の技術により、患者の歯の焼石膏型を入手することに依存する。歯の型を入手した後、従来のレーザー走査または他の範囲獲得(range aquisition)システムを用いて、デジタル的に走査し、IDDSを作成し得る。範囲獲得システムにより作成されるデータ組は、もちろん、後に詳細に説明するように、データ組内の画像を操作するために使用されるソフトウエアに適合した他の形式に変換し得る。歯の焼石膏型の作製およびレーザー走査技術を用いたデジタル模型の作成のための一般的技術は、例えば、参照として全開示を本願に援用する米国特許第5,605,459号に記載されている。
列において、上下歯列状態の相対位置の走査を可能にする。これは通常、まずスキャナーの前に歯が上向きになるように下側の型を置き、次に下側の型の上に蝋の咬型を重ね置き、最後に歯を下向きにして、蝋の咬型の上に位置するように上側の型を下側の型の上に重ねることにより達成される。次に、上下型の相対位置に対する円筒形の走査が獲得される。走査されたデータは、口腔内の相対的構成と同様に配置された患者の歯列弓の組み合わせである物体を表す中程度の解像度のデジタル模型を提供する。
and the Computation of Voronoi Diagrams,ACM Transactions of Graphics,Vol.4,No.2,April 1985,74から123ページにおいて定義されている標準的な幾何学的データ構造である。ウイングドエッジ構造など他の幾何学的データ構造も使用し得る。
薄いことを望む。しかしながら、ユーザは、上述のように例えば周囲の歯を切削するとき、より厚いカットを望み得る。図形上は、カットは曲線の一方をカット厚さにより限定された曲線として現れる。
ここで、逸脱がなければ値は0であり、NとCNとが垂直のときは1である。
とを確認する。上下の歯列弓のかみ合わせは、衝突検出アルゴリズムを用いて、歯の接触点を赤色にて明示することでも視覚化される。
ーザ特定位置(最初の位置、すべてのキーフレーム位置、および目標位置を含む)を自動的に線形補間する。例えば、特定の要素に対して最終的位置のみが規定された場合、最初の段階の後の各後続の段階は、単に最終的位値に等しい線形距離、および(4元数(quaternion)により特定された)近似の回転を示す。ユーザがその要素に対して2つのキーフレームを特定した場合、その要素は、最初の位置から、異なる段階を経て、最初のキーフレームにより規定された位置に線形に「移動」する。次に、その要素は、おそらく異なる方向で、第2のキーフレームにより規定された位置に線形に移動する。最終的に、おそらくさらに異なる方向で、目標位置に線形に移動する。
により個別に補間される。従って、全体の構成空間は、移動される歯ごとに二次元を含み、そのすべてが、その後の検索の間において等しく取り扱われる。
に対応する。
スは、治療専門家または、デジタル模型要素との即時的および視覚的インタラクションを備えたユーザを備える。インターフェイス上には、特定の区分を操作するために、コンピュータに命令するための単純な低レベルコマンドのみを許可することが好適である。換言すれば、操作に使用されるGUIは、例えば、「この要素を右に0.1mm移動せよ」などの種類の命令のみ受け取るインターフェイス上で行われることが好適である。そのような低レベルコマンドを精密に調整することは有用であるが、単一のインターフェイスが存在する場合、要素操作のプロセスは、冗長であり時間の掛かるインタラクションになる。
に使用される。入力装置および表示を例外として、他の要素は、同一の物理的位置に存在する必要はない。従って、例えば、ファイル格納システムの一部が、様々なローカルエリアまたは電話回線を含む広域ネットワーク媒体を介して接続され得る。同様に、入力装置および表示も、プロセッサと同一の位置に存在する必要はないが、本発明は、PCおよびワークステーションの環境において、最も頻繁に実施されることを想定している。
Claims (25)
- デジタルデータ組を生成する方法であって、該方法は、第1のコンピュータと第2のコンピュータと第3のコンピュータとディスプレイとを備えたシステムにおいて実行され、該デジタルデータ組は、複数の歯再配置器具を製造するために用いられるものであり、
該方法は、
該第1のコンピュータが、最初の歯列を表す最初のデジタルデータ組を生成することと、
該ディスプレイが、該最初のデータ組に基づいて視覚的画像を表示することと、
該第2のコンピュータが、記述された説明書、視覚的な外観、ユーザからの入力、該コンピュータ内にプログラムされたルールまたはアルゴリズムのうちの1つ以上に基づいて、該視覚的画像内の個々の歯を再配置するように該視覚的画像を操作することであって、該操作された視覚的画像は、最終的な歯列を示す、ことと、
該第2のコンピュータが、該操作された視覚的画像において示される再配置された歯を有する該最終的な歯列を表す最終的なデジタルデータ組を生成することと、
該第3のコンピュータが、以前に生成された該最初のデジタルデータ組および該最終的なデジタルデータ組の両方に基づいて、コンピュータアルゴリズムに従って、該最初の歯列から該最終的な歯列に漸進する一連の連続する歯列を表す複数の中間のデジタルデータ組を自動的に生成することと
を包含する、方法。 - 前記システムは、第4のコンピュータをさらに備え、
前記生成されたデジタルデータ組のうちの少なくともいくつかは、該第4のコンピュータによって用いられ、該第4のコンピュータが、複数の一連の歯科用漸増的再配置器具のうちの少なくともいくつかを製造するように、製造機械を制御する、請求項1に記載の方法。 - 前記第1のコンピュータが前記最初の歯列を表す最初のデジタルデータ組を生成するステップが、患者の歯の三次元モデルを走査することを包含する、請求項1に記載の方法。
- 前記第2のコンピュータが前記視覚的画像を操作するステップが、
個々の歯のうちの少なくともいくつかについて境界を定義することと、
前記デジタルデータ組に基づく画像において、他の歯に対して該歯の境界の少なくともいくつかを移動させることと
を包含する、請求項3に記載の方法。 - 前記第1のコンピュータと前記第2のコンピュータと前記第3のコンピュータとのうちの少なくとも2つは、同じコンピュータである、請求項1、3、4のいずれか1項に記載の方法。
- デジタルデータ組を生成する方法であって、該方法は、第1のコンピュータと第2のコンピュータとを含むシステムにおいて実行され、該デジタルデータ組は、複数の歯再配置器具を製造するために用いられるものであり、
該方法は、
該第1のコンピュータが、最初の歯列における患者の実際の歯の実質的に正確な形状を表す最初のデジタルデータ組を生成することと、
該第2のコンピュータが、該第2のコンピュータによって受信されたユーザ入力、視覚的な外観、記述された説明書、該第2のコンピュータ内にプログラムされたルールまたはアルゴリズムのうちの1つ以上に基づいて、最終的な歯列における該患者の実際の歯の実質的に正確な形状を表す最終的なデジタルデータ組を生成することと、
該第2のコンピュータが、以前に生成された該最初のデジタルデータ組および該最終的なデジタルデータ組の両方に基づいて、コンピュータアルゴリズムに従って、複数の一連のデジタルデータ組を自動的に生成することであって、該複数の一連のデジタルデータ組は、該最初の歯列から該最終的な歯列に漸進する一連の連続する歯列における該患者の実際の歯の実質的に正確な形状を表す、ことと
を包含する、方法。 - 前記システムは、第3のコンピュータをさらに備え、
前記複数の一連のデジタルデータ組のうちの少なくともいくつかは、該第3のコンピュータによって用いられ、製造される複数の一連の歯科用漸増的再配置器具のうちの少なくともいくつかを製造するように、前記製造機械を制御する、請求項6に記載の方法。 - 前記第1のコンピュータが前記最初の歯列を表す最初のデジタルデータ組を生成するステップが、患者の歯の三次元モデルを走査することを包含する、請求項6に記載の方法。
- 前記第2のコンピュータが前記最終的な歯列を表すデジタルデータ組を生成するステップが、
視覚的画像において、個々の歯のうちの少なくともいくつかについて境界を定義することと、
該視覚的画像において、他の歯に対して該歯の境界の少なくともいくつかを移動させることにより、該最終的なデータ組を作成することと
を包含する、請求項6に記載の方法。 - 前記第2のコンピュータが前記複数の一連のデジタルデータ組を生成するステップが、
前記最初のデジタルデータ組と前記最終的なデジタルデータ組との間の位置的な差を判別することと、
該差を補間することと
を包含する、請求項6に記載の方法。 - 前記補間するステップが、線形補間を含む、請求項10に記載の方法。
- 前記補間するステップが、非線形補間を含む、請求項10に記載の方法。
- 前記第2のコンピュータが、前記最初の歯列と前記最終的な歯列との間に一つ以上のキーフレームを定義することと、
該キーフレームの間を補間することと
をさらに包含する、請求項10に記載の方法。 - 前記第1のコンピュータと前記第2のコンピュータとが、同じコンピュータである、請求項6、8〜13のいずれか1項に記載の方法。
- デジタルデータ組を生成する方法であって、該方法は、第1のコンピュータと第2のコンピュータとを含むシステムにおいて実行され、該デジタルデータ組は、複数の歯再配置器具を製造するために用いられるものであり、
該方法は、
該第1のコンピュータが、最初の歯列を表す最初のデジタルデータ組を生成することと、
該第2のコンピュータが、該第2のコンピュータによって受信されたユーザ入力、視覚的な外観、記述された説明書、該第2のコンピュータ内にプログラムされたルールまたはアルゴリズムのうちの1つ以上に基づいて、最終的な歯列を表す最終的なデジタルデータ組を生成することと、
該第2のコンピュータが、以前に生成された該最初のデジタルデータ組および該最終的なデジタルデータ組の両方に基づいて、コンピュータアルゴリズムに従って、複数の一連のデジタルデータ組を自動的に生成することであって、該複数のデジタルデータ組は、該最初の歯列から該最終的な歯列に漸進する一連の連続する歯列を表す、ことと
を包含する、方法。 - 前記第1のコンピュータが前記最初の歯列を表す最初のデジタルデータ組を生成するステップが、患者の歯の三次元モデルを走査することを包含する、請求項15に記載の方法。
- 前記第2のコンピュータが前記最終的な歯列を表す最終的なデジタルデータ組を提供するステップが、
個々の歯のうちの少なくともいくつかについて境界を定義することと、
該デジタルデータ組に基づく画像において、他の歯に対して該歯の境界の少なくともいくつかを移動させることにより、該最終的なデータ組を作成することと
を包含する、請求項15に記載の方法。 - 前記第2のコンピュータが前記複数の一連のデジタルデータ組を生成するステップが、
前記最初のデジタルデータ組と前記最終的なデジタルデータ組との間の位置的な差を判別することと、
該差を補間することと
を包含する、請求項15に記載の方法。 - 前記補間するステップが、線形補間を含む、請求項18に記載の方法。
- 前記補間するステップが、非線形補間を含む、請求項18に記載の方法。
- 前記第2のコンピュータが、前記最初の歯列と前記最終的な歯列との間に一つ以上のキーフレームを定義することと、
該キーフレームの間を補間することと
をさらに包含する、請求項18に記載の方法。 - 前記システムは、第3のコンピュータを備え、
前記一連のデジタルデータ組は、該第3のコンピュータによって用いられ、前記一連のデジタルデータ組に基づいて前記一連の歯列の一連の雄型を作製するように、製造機械を制御し、
該製造機械は、歯科器具を該雄型の雌型として作製する、請求項15に記載の方法。 - 前記一連のデジタルデータ組は、前記第3のコンピュータによって用いられ、その結果、前記一連の雄型のそれぞれに対して、
未硬化重合体樹脂の塊が供給され、
前記デジタルデータ組に基づく形に、該樹脂を選択的に硬化させるようにレーザーが走査されることにより、前記雄型が作製される、請求項22に記載の方法。 - 前記一連のデジタルデータ組は、前記第3のコンピュータによって用いられ、前記雄型から前記器具を型取りする、請求項22に記載の方法。
- 前記第1のコンピュータと前記第2のコンピュータとが、同じコンピュータである、請求項15〜21のいずれか1項に記載の方法。
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JP2011523565A (ja) * | 2008-04-29 | 2011-08-18 | マテリアライズ・デンタル・ナムローゼ・フエンノートシャップ | 側頭下顎関節における提案された歯の改質の影響を決定するための方法 |
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