JP6479944B2 - アップコンバージョン蛍光体を含有する歯科用組成物及び使用方法 - Google Patents
アップコンバージョン蛍光体を含有する歯科用組成物及び使用方法 Download PDFInfo
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- JP6479944B2 JP6479944B2 JP2017232367A JP2017232367A JP6479944B2 JP 6479944 B2 JP6479944 B2 JP 6479944B2 JP 2017232367 A JP2017232367 A JP 2017232367A JP 2017232367 A JP2017232367 A JP 2017232367A JP 6479944 B2 JP6479944 B2 JP 6479944B2
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- FRNOGLGSGLTDKL-UHFFFAOYSA-N thulium atom Chemical compound [Tm] FRNOGLGSGLTDKL-UHFFFAOYSA-N 0.000 description 1
- 238000011282 treatment Methods 0.000 description 1
- 238000002211 ultraviolet spectrum Methods 0.000 description 1
- 238000001429 visible spectrum Methods 0.000 description 1
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- NAWDYIZEMPQZHO-UHFFFAOYSA-N ytterbium Chemical compound [Yb] NAWDYIZEMPQZHO-UHFFFAOYSA-N 0.000 description 1
- VWQVUPCCIRVNHF-UHFFFAOYSA-N yttrium atom Chemical compound [Y] VWQVUPCCIRVNHF-UHFFFAOYSA-N 0.000 description 1
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Description
本出願は、2013年12月31日に出願され、その全体が引用することにより本明細書の一部をなすものとする米国特許出願第61/922,162号の恩典及び優先権を主張する。
例示的な実施形態による塗料は、アップコンバージョンする蛍光体粒子自体といった単純なものであってもよいが、通例バインダを含み、更に通例、幾つかのタイプの硬化性バインダを含む。目下好ましい実施形態では、殆どの歯科用途に使用されるアップコンバージョン塗料は、粒子とレジンとの比率が1質量%〜95質量%の範囲をとる、アップコンバージョンする結晶粒子と、レジンベースとの混合物を含む。任意の特定の用途における粒子の具体的な濃度は変動し得るものの、濃度は、初めの励起放射線の所定のレベル及び露光時間を用いて、(通例、25ミクロン〜500ミクロンの厚みを有する)セメントの隣接する層の厚み全体の少なくとも一部を硬化させるのに十分なものであるように選択されるものとし、実施形態によっては、例えば、少なくとも25重量%又は少なくとも約50重量%とすることができる。米国特許出願公開第2013/0323685号(その全体を引用することにより本明細書の一部をなすものとする)に記載されているようなアップコンバージョン結晶を用いた複合体用途に使用されるものよりも高い、アップコンバージョン結晶濃度を有することが好ましい。
既に述べたように、上記に記載の塗料は、到達が困難な位置で硬化し始めるか、そうでなければ、空間的な硬化が望ましい歯科用セメントと組み合わせて有利に使用することができる。本明細書中に記載される発光塗料とともに使用されるセメントは、当業者に既知のもの等を含み、概して、限定するものではないが、発光塗料に関して既に述べたレジン及び/又は光開始剤の1つ又は複数を使用し得るいずれのセメントであってもよい。しかしながら、発光コーティングへのセメントの結合は、(もしあれば)塗料と同じベースレジン又はそれと相溶性のものを含むセメントを用いることによって改善されることが理解されよう。さらに、用いられるセメントの透過性(例えば、初めの赤外線、及び/又は次に放出された青色光又はUV線に対する透過性)は、その結果に影響を及ぼすことが理解されよう。透過性を増大させると、硬化深さが改善される(例えばセメントが厚くなる)のに対し、透過性を低下させると、境界面(境界面における照明半径)から溢れ出る硬化セメントの量を低減するのに有益となるため、好まれる具体的な透過性は、用途に応じて変動し得る。概して、初めの放射線に対する透過性の変動は硬化深さに作用し、次に放出された放射線に対する透過性の変動は、結晶粒子の周りの硬化半径に作用することが理解されよう。
塗料の正確な塗布は通例、望ましくない位置での硬化を防止するために重要である。アップコンバージョンする粒子の硬化の作用半径は、塗料を歯構造体上に塗布する際にも考慮され得るため、硬化が縁の最も近くで起こるように塗料を塗布することが好ましいが、歯科用修復物に通例望まれる滑らかな最大の生物学的輪郭を得るために、歯の輪郭からはるかに内側又は外側になりすぎないようにする。例えば、粒子の周りの硬化半径は約100ミクロンとすると、塗料は、縁から100ミクロン短い境界面に塗布することで、縁で硬化が停止する。
一実施形態によれば、本明細書中に開示される塗料組成物は、図1a〜図1dに概略的に示されるように、セメントとともに、歯科矯正ブラケットを歯に取り付けるのに使用される。
他の例示的な実施形態によれば、クラウンの場合で図示される補綴物100に関して図2に概略的に示される、例としてブリッジ及びクラウン等の歯科用補綴物をしっかりと固定するのに、本明細書中に記載される組成物を使用することもできる。固定補綴物の場合、アップコンバージョン塗料20を、歯構造体200と接触する補綴物100の内表面に塗布する。従来の光硬化性セメント30も、アップコンバージョン塗料20を覆う、補綴物の内表面に塗布したら、補綴具100を臨床医によって設置する。これによって一般に、過剰なセメント30が周縁から漏れ出る。歯科矯正ブラケットのしっかりとした固定に関して記載したのと同様に、補綴物100を設置したら、赤外光45(又は、アップコンバージョン蛍光体の励起スペクトルと相補的な他の放射線)を放出する硬化光40を使用して、塗料20を活性化せて、青色光25(又は、光開始剤の解離を引き起こすのに必要とされるスペクトルと相補的な他の放射線)を塗料20に照射させた結果、補綴物100と歯構造体200との境界面に硬化セメント32がもたらされる。(図面、例えば図2及び図3中に示される青色光25の境界線は、図示を簡単にするためのものであり、光が放出される厳密な様子を表すことを意味するものではないことが理解されよう。)
層毎にレジンの所望部位を照射する光源を用いて、同様に層毎に硬化させる幾つかの3D印刷方法が知られている。しかしながら、これらのプリンタは通例、層を作成する際にその材料が取扱い易いように低粘度レジンを使用するものである。粒子が多く充填されるレジンを印刷する場合には、主に、硬化部位及び硬化深さの制御に関連する問題のために、3D印刷における問題が残る。これらの問題は、充填粒子の散乱に起因して損なわれ得るものである。正確な送り出しによってペースト粘度を制御することも、高度に充填されるレジンの3D印刷において直面する別のハードルである。さらに、光硬化性レジンを用いた通例の3D印刷では、各層の間にかなりの時間(3秒〜5秒/層)を要するため、処理時間が長くなる。
体積散乱材料(例えば、セラミック、複合レジン、ラミネート又は歯科用の歯材料)からなる構造体の十分にアクセス可能な範囲には照明を当てることができ、この光を対象物内で散乱させる。何らかの不均一性が、散乱パターンを変化させ、光散乱対象物の外側から検知することができる。特に不均一性が対象物の外側の境界線に近ければ、対象物表面で直接、光強度分布を観測することによって、結像が可能となる。この場合、例えば、セラミック構造体におけるクラック又はラミネートの層間剥離が、屈折率不均一性により光子の伝播を妨げることによって陰を作る。歯が齲蝕である場合、表面の侵食も、屈折率が変化するとともに、光学特性(吸収係数及び散乱係数並びにg因子)を変化させた範囲を作り出し、体積散乱材料の外側から見える光の伝播の違いを生じさせる。
別の実施形態では、上記の齲蝕の診断フィルムと同様に、アップコンバージョン粒子を含むこの同じ歯間フィルムを使用して、歯間部位に配置したレジンを硬化させてもよい。これは、歯間部位をコーティングするとともに、歯間齲蝕の更なる進行を防止するのに使用することができる。アップコンバージョン粒子は、レジンの硬化が起こる必要があるとともに、望ましくない場合には硬化を防止する範囲を定めるように、配置することができる(首に近すぎる場所(too cervical)、及び唇に近すぎる場所(too labial)、頬側又は咬合面)。硬化のこの制御によって、歯間塗料の正確な範囲指定、それ故、より良好な輪郭、より軟質の終端が可能となるため、より良好な生体適合性及び極めて容易な過剰物の除去がもたらされる。
Claims (13)
- 未硬化レジン材料と、光開始剤と、50重量%〜90重量%の範囲の不活性フィラー粒子とを含む第1の層を準備することと、
プリントヘッドを介して、アップコンバージョン蛍光体を含む組成物の第1の個々の層を、前記第1の層の所定の表面領域に堆積させることと、
前記第1の層、及び堆積した前記第1の個々の層を覆う、前記未硬化レジン材料と、前記光開始剤と、50重量%〜90重量%の範囲の前記不活性フィラー粒子とを含む第2の層を準備することと、
前記プリントヘッドを介して、前記アップコンバージョン蛍光体を含む前記組成物の第2の個々の層を、前記第2の層の所定の表面領域に堆積させることと、
前記第2の層、及び堆積した前記第2の個々の層を覆う、前記未硬化レジン材料、前記光開始剤と、50重量%〜90重量%の範囲の前記不活性フィラー粒子とを含む第3の層を準備することと、
前記未硬化レジン材料中の前記光開始剤の活性化波長に対応する波長で前記アップコンバージョン蛍光体を発光させることによって、前記アップコンバージョン蛍光体に隣接する領域で前記未硬化レジン材料を硬化させ、硬化レジン塊を形成する波長の光を、前記第1の層から前記第3の層、及び堆積した前記第1の個々の層および堆積した前記第2の個々の層に照射することと、
残る未硬化レジン材料を前記硬化レジン塊から分離することと、
を含み、
前記第1の個々の層および前記第2の個々の層を、前記第1の層および前記第2の層の前記所定の表面領域に、歯科用品の所定の形態に対応するパターンで堆積させる、前記歯科用品を三次元印刷する方法。 - 前記歯科用品上で二次成形作業を実行することを更に含む、請求項1に記載の方法。
- 前記第1の個々の層および前記第2の個々の層を、前記歯科用品を囲むシェル部分に対応するように、前記第1の層および前記第2の層の表面領域上に堆積させる、請求項1に記載の方法。
- 前記残る未硬化レジン材料を前記硬化レジン塊から分離する工程が、前記残る未硬化レジン材料が前記歯科用品の形態をとり、その後、前記残る未硬化レジン材料が前記歯科用品の形態で硬化するように、前記硬化レジン塊を前記シェル部分として除去することを含む、請求項3に記載の方法。
- 前記第1の個々の層および前記第2の個々の層を、前記歯科用品に対応する前記第1の層から前記第2の層の表面領域上、及び前記歯科用品を囲むシェル部分に対応する前記第1の層および前記第2の層の表面領域上の両方に堆積させ、該2つの表面領域が前記第1の層から前記第3の層の表面の間隙部分で分離しており、前記第1の層から前記第3の層上には、照射工程によって、前記歯科用品の形態の第1の硬化レジン塊、及び前記歯科用品を少なくとも部分的に囲むシェルの形態の第2の硬化レジン塊がもたらされるように、前記第1の個々の層および前記第2の個々の層を堆積させない、請求項1に記載の方法。
- 前記分離する工程が、前記歯科用品を少なくとも部分的に囲む前記シェルを除去し、その後、前記残る未硬化レジン塊を、前記歯科用品の表面から除去することを含む、請求項5に記載の方法。
- 前記歯科用品上で二次成形作業を実行することを更に含む、請求項6に記載の方法。
- 前記第1の層から前記第3の層が、25ミクロン〜250ミクロンの範囲の厚みを有する、請求項1に記載の方法。
- 前記第1の層から前記第3の層の少なくとも1つが、層厚を制御するようなメカニカルストッパを有する、請求項1に記載の方法。
- 前記第1の層から前記第3の層が、前記未硬化レジン材料の連続するリボンから設けられる、請求項1に記載の方法。
- 前記第1の個々の層の前記アップコンバージョン蛍光体の塗料密度が、前記第2の個々の層の前記アップコンバージョン蛍光体の塗料密度と異なる、請求項1に記載の方法。
- 重合性レジンと、光開始剤と、不活性フィラーとを含む未硬化充填レジン材料の供給源と、
アップコンバージョン蛍光体を含む組成物の個々の層を、前記未硬化充填レジン材料が段階的に積層された層の所定の表面領域に、歯科用品の所定の形態に対応するパターンで塗布するように構成されるプリントヘッドと、
前記未硬化充填レジン材料中の前記光開始剤の活性化波長に対応する波長で前記アップコンバージョン蛍光体を発光させることによって、前記アップコンバージョン蛍光体に隣接する領域で前記レジン材料を硬化させ、硬化レジン塊を形成する波長を、未硬化充填レジン材料の層、及びアップコンバージョン蛍光体を含む前記組成物の堆積層に照射するように構成される放射線源と、
を備える、三次元印刷システム。 - 未硬化レジン材料と、光開始剤と、50重量%〜90重量%の範囲の不活性フィラー粒子とを含む第1の層を準備することと、
プリントヘッドを介して、アップコンバージョン蛍光体を含む組成物の第1の個々の層を、前記第1の層の所定の表面領域に堆積させることと、
前記第1の層及び堆積した前記第1の個々の層を覆う、前記未硬化レジン材料、前記光開始剤と、50重量%〜90重量%の範囲の前記不活性フィラー粒子とを含む第2の層を準備することと、
前記プリントヘッドを介して、前記アップコンバージョン蛍光体を含む前記組成物の第2の個々の層を、前記第2の層の所定の表面領域に堆積させることと、
第n+1の層及び堆積した第n+1の個々の層を覆う、前記未硬化レジン材料、前記光開始剤と、50重量%〜90重量%の範囲の前記不活性フィラー粒子とを含む第n+2の層を準備すること(ただし、nは1以上の整数)を所定の回数繰り返すことと、
前記未硬化レジン材料中の前記光開始剤の活性化波長に対応する波長で前記アップコンバージョン蛍光体を発光させることによって、前記アップコンバージョン蛍光体に隣接する領域で前記未硬化レジン材料を硬化させ、硬化レジン塊を形成する波長の光を、前記第1の層から前記第n+2の層及び堆積した前記第1の個々の層から堆積した前記第n+1の個々の層に照射することと、
残る未硬化レジン材料を前記硬化レジン塊から分離することと、
を含み、
堆積した前記第1の個々の層から堆積した前記第n+1の個々の層を、前記第1の層から前記第n+1の層の前記所定の表面領域に、歯科用品の所定の形態に対応するパターンで堆積させる、前記歯科用品を三次元印刷する方法。
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2014
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- 2014-12-31 EP EP14833443.6A patent/EP3089728A2/en active Pending
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US20210275286A1 (en) | 2021-09-09 |
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CA2937969C (en) | 2023-10-03 |
EP3089728A2 (en) | 2016-11-09 |
JP2018048200A (ja) | 2018-03-29 |
JP2017502965A (ja) | 2017-01-26 |
CA2937969A1 (en) | 2015-07-09 |
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