JP4917692B1 - 切削装置用の歯科用組成物 - Google Patents
切削装置用の歯科用組成物 Download PDFInfo
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- JP4917692B1 JP4917692B1 JP2011166308A JP2011166308A JP4917692B1 JP 4917692 B1 JP4917692 B1 JP 4917692B1 JP 2011166308 A JP2011166308 A JP 2011166308A JP 2011166308 A JP2011166308 A JP 2011166308A JP 4917692 B1 JP4917692 B1 JP 4917692B1
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- NBOMNTLFRHMDEZ-UHFFFAOYSA-N thiosalicylic acid Chemical compound OC(=O)C1=CC=CC=C1S NBOMNTLFRHMDEZ-UHFFFAOYSA-N 0.000 description 1
- 229940103494 thiosalicylic acid Drugs 0.000 description 1
- ZEMGGZBWXRYJHK-UHFFFAOYSA-N thiouracil Chemical group O=C1C=CNC(=S)N1 ZEMGGZBWXRYJHK-UHFFFAOYSA-N 0.000 description 1
- YRHRIQCWCFGUEQ-UHFFFAOYSA-N thioxanthen-9-one Chemical compound C1=CC=C2C(=O)C3=CC=CC=C3SC2=C1 YRHRIQCWCFGUEQ-UHFFFAOYSA-N 0.000 description 1
- 229910052718 tin Inorganic materials 0.000 description 1
- 239000011135 tin Substances 0.000 description 1
- 150000003606 tin compounds Chemical class 0.000 description 1
- XOLBLPGZBRYERU-UHFFFAOYSA-N tin dioxide Chemical compound O=[Sn]=O XOLBLPGZBRYERU-UHFFFAOYSA-N 0.000 description 1
- 229910001887 tin oxide Inorganic materials 0.000 description 1
- 150000003623 transition metal compounds Chemical class 0.000 description 1
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- QORWJWZARLRLPR-UHFFFAOYSA-H tricalcium bis(phosphate) Chemical compound [Ca+2].[Ca+2].[Ca+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O QORWJWZARLRLPR-UHFFFAOYSA-H 0.000 description 1
- YUYCVXFAYWRXLS-UHFFFAOYSA-N trimethoxysilane Chemical compound CO[SiH](OC)OC YUYCVXFAYWRXLS-UHFFFAOYSA-N 0.000 description 1
- MXSVLWZRHLXFKH-UHFFFAOYSA-N triphenylborane Chemical compound C1=CC=CC=C1B(C=1C=CC=CC=1)C1=CC=CC=C1 MXSVLWZRHLXFKH-UHFFFAOYSA-N 0.000 description 1
- YFTHZRPMJXBUME-UHFFFAOYSA-N tripropylamine Chemical compound CCCN(CCC)CCC YFTHZRPMJXBUME-UHFFFAOYSA-N 0.000 description 1
- 235000013799 ultramarine blue Nutrition 0.000 description 1
- 239000006097 ultraviolet radiation absorber Substances 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
- GPPXJZIENCGNKB-UHFFFAOYSA-N vanadium Chemical compound [V]#[V] GPPXJZIENCGNKB-UHFFFAOYSA-N 0.000 description 1
- 239000010457 zeolite Substances 0.000 description 1
- 235000014692 zinc oxide Nutrition 0.000 description 1
- 239000011787 zinc oxide Substances 0.000 description 1
- NWONKYPBYAMBJT-UHFFFAOYSA-L zinc sulfate Chemical compound [Zn+2].[O-]S([O-])(=O)=O NWONKYPBYAMBJT-UHFFFAOYSA-L 0.000 description 1
- 229960001763 zinc sulfate Drugs 0.000 description 1
- 229910000368 zinc sulfate Inorganic materials 0.000 description 1
- 229910052984 zinc sulfide Inorganic materials 0.000 description 1
- DRDVZXDWVBGGMH-UHFFFAOYSA-N zinc;sulfide Chemical compound [S-2].[Zn+2] DRDVZXDWVBGGMH-UHFFFAOYSA-N 0.000 description 1
- 229910052726 zirconium Inorganic materials 0.000 description 1
- 229910001928 zirconium oxide Inorganic materials 0.000 description 1
- GFQYVLUOOAAOGM-UHFFFAOYSA-N zirconium(iv) silicate Chemical compound [Zr+4].[O-][Si]([O-])([O-])[O-] GFQYVLUOOAAOGM-UHFFFAOYSA-N 0.000 description 1
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Abstract
【解決手段】少なくとも1種の充填材および樹脂マトリックスを含み、前記の少なくとも1種の充填材が粒子であり、前記粒子の平均粒径が110〜500μmであり、最大粒径が前記平均粒径の1.4倍未満であり、および粒径分布のD30が前記平均粒径の0.9倍以上である、歯科用組成物。
【選択図】なし
Description
本発明の好ましい態様において、前記の歯科用組成物が含有する第一の粒子の材料は、無機材料、有機材料、または有機無機複合材料のいずれであってよい。
本発明の他の態様において、本発明の歯科用組成物が含有する無機充填材は、気相法により生成したアエロジルまたはゾル−ゲル反応等の溶液中から生成したシリカージルコニア酸化物粒子等の無機超微粒子を凝集させた凝集性無機充填材等であってもよい。これらの無機充填材は、単独でまたは複数を組み合わせて用いることができる。
本発明の好ましい態様において、本発明にかかる歯科用組成物の少なくとも1種の充填材は、前記第一の粒子に加えて、第二の粒子をさらに含んでいてよく、前記第二の粒子は、限定するものではないが、前記第二の粒子の平均粒径は好ましくは20〜112μmであり、前記第二の粒子の最大粒径は前記平均粒径の1.4倍未満であり、および前記第二の粒子の粒径分布のD30は前記平均粒径の0.8倍以上である。
本発明のさらに好ましい態様において、前記の第一の粒子および前記の第二の粒子はそれぞれ、無機粒子である。
本発明のさらに好ましい態様において、本発明にかかる歯科用組成物の少なくとも1種の充填材は、前記第一の粒子および前記第二の粒子を含み、前記第一の粒子に対する前記第二の粒子の平均粒径の比が0.1〜0.3であり、好ましくは0.15〜0.25であり、ならびに前記第一の粒子に対する前記第二の粒子の配合量の比(質量比)が0.05〜0.5であり、好ましくは0.05〜0.3である。
本発明のよりさらに好ましい態様において、前記の第一の粒子および前記の第二の粒子はそれぞれ、無機粒子である。
本発明の好ましい他の態様において、本発明の歯科用組成物に用いられる粒子の充填材は、限定するものではないが、気相法、ゾル−ゲル法、懸濁重合法、または分散重合法等により作製することができる。
粒子の円形度は、光学顕微鏡または走査型電子顕微鏡(以下、SEMという)の撮影像を画像解析装置で処理することにより求めた。画像処理するサンプル数は50個以上とした。即ち、画像処理で得られた粒子の面積をSとし、粒子の周囲長をLとし、円形度e=(4・π・S)/(L2)を算出した。
ガラスの着色範囲は、以下に示すLabの範囲で調整することが好ましい。本発明にかかる歯科用組成物の少なくとも1種の充填材は、顔料の調整により、下記の色調に調整されていることが好ましい。
L*=50〜75、a*=−4〜−1 b*=−8〜4
CAD/CAMシステム用の歯科用ブロック等を作製する場合には、従来の歯科用補綴物を作製する場合に比べ、大きな形状の硬化物を作製することになる。したがって、そのような大きな形状の硬化物においては、重合収縮に伴う内部応力がたまり易く、硬化物の機械的強度等の物性が低下する傾向がある。
本実施例においては、円形度が0.95以上の表1のガラス1を用いた。用いたガラス微粉末の平均粒径、最大粒径、最小粒径および粒度分布のD30を、表2に示す。
β;第一の粒子に対する第二の粒子の配合量の比(質量比)(=[第二の粒子の配合量(質量)]/[第一の粒子の配合量(質量)])、
γ;組成物に対する少なくとも1種の充填材の配合割合。
表3で示した各歯科用組成物のペーストを、5mm×5mm×50mmの四角柱に造形し、角度が180度から120度になるように折り曲げた。前記の折り曲げた四角柱の引張側の安定性を、以下の評価基準に従って評価した。
A:白濁およびせん断のいずれも確認されず、安定性に優れる。
B:白濁は確認されたが、せん断はほとんど確認されず、十分に安定である。
C:白濁およびせん断が確認され、安定性が実用的ではない。
なお、AおよびBは、実用的な安定性を有するペーストであると判断する。
表3で示した各歯科用組成物のペーストを、4mmφ×4mmの穴を有する金型に充填した。前記金型へのペーストの充填性を、以下の評価基準に従って評価した。
A:付形性に優れ、ペーストの延びが良く、充填性に優れる。
B:付形性またはペーストの延びのいずれかが優れ、容易に充填可能である。
C:付形性またはペーストの延びのいずれかが不十分で、充填性が実用的ではない。
なお、AおよびBは、実用的な充填性を有するペーストであると判断する。
表3で示した各歯科用組成物のペーストを、半径5mm、厚さ5mmの円柱の透明アクリル型に詰め、ソリディライトII(株式会社松風)にて、1回あたり3分間の光照射を、上面と底面の両方にそれぞれ3回実施し、前記の透明アクリル型から硬化物を得た。得られた硬化物の片面を1ミリ削り、前記硬化物を全長4ミリとした。前記の削った面を、回転研磨器にて研磨し、試験体とした。以下の耐磨耗性試験を行った。耐磨耗性試験前の試験体から該試験後の試験体の長さの差を、磨耗量とした。各試験体につき、7箇所の磨耗量を測定し、その平均値を表4に示した。
耐磨耗性試験1:試験体の研磨面が、水中の耐水研磨紙#240と接触するように試験体を置き、前記水中の試験体の研磨面と反対側の面をモーター軸と連結した。試験体に100g重の荷重をかけ、23℃でモーターを1分間あたり1回転で1時間運転させた。
耐磨耗性試験2:2つの同じ試験体の研磨面同士を水中で接触するように置き、水中で上の試験体の研磨面と反対側の面をモーター軸と連結した。試験体に100g重の荷重をかけ、23℃でモーターを1分間あたり1回転で168時間運転させた。
表3で示した各歯科用組成物のペーストを、厚さ5mm、幅1cm、長さ5cmの透明アクリル型に詰め、耐摩耗試験と同様に光照射を行って、前記の透明アクリル型から硬化物を得た。得られた7個の硬化物をマイクロメータで測定し、収縮率を計算し(%)、平均値を表4に示した。
表4で示されるように、耐摩耗性試験1の結果は、実施例1が、比較例2〜5と比較して、耐摩耗性において十分な耐磨耗性を有することを示している。耐磨耗性試験1の結果は、実施例1〜10および比較例1が良好な耐磨耗性を有することを示している。耐磨耗性試験1および2の結果は、実施例1〜10が十分な耐磨耗性を有することを示している。また、耐磨耗性試験1および2の結果は、実施例2〜5が良好な耐磨耗性を有することを示している。
本発明の実施形態にかかる実施例1〜10の歯科用組成物で形成された硬化物は、曲げ強度、圧縮強さおよび硬度もまた顕著に向上した。
Claims (5)
- 平均粒径が110〜500μmであり、その最大粒径が前記平均粒径の1.4倍未満であり、かつ、その粒径分布のD30が前記平均粒径の0.9倍以上である第一の粒子、および前記第一の粒子に対する粒子の平均粒径の比が0.1〜0.3であり、前記第一の粒子に対する粒子の配合量の比が0.05〜0.5である第二の粒子からなる充填材と、樹脂マトリックスとを混合して得られる、歯科用組成物であって、
前記の充填材が、歯科用組成物において65.0〜99.5質量%である、歯科用組成物。 - 前記第一の粒子および/または第二の粒子が無機粒子である、請求項1記載の歯科用組成物。
- 前記の第一の粒子および/または第二の粒子が着色されている、請求項1または2記載の歯科用組成物。
- 前記の第一の粒子および/または第二の粒子が球形である、請求項1〜3のいずれか一項記載の歯科用組成物。
- 請求項1〜4のいずれか一項記載の歯科用組成物で形成された、歯科用ブロックまたは歯科用補綴物。
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US13/218,779 US9220663B2 (en) | 2011-07-29 | 2011-08-26 | Dental composition |
CN201210266341.4A CN102895125B (zh) | 2011-07-29 | 2012-07-27 | 适于用自动切削装置切削的牙科用组合物 |
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