JP5599608B2 - 生物活性ガラス - Google Patents
生物活性ガラス Download PDFInfo
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- JP5599608B2 JP5599608B2 JP2009514912A JP2009514912A JP5599608B2 JP 5599608 B2 JP5599608 B2 JP 5599608B2 JP 2009514912 A JP2009514912 A JP 2009514912A JP 2009514912 A JP2009514912 A JP 2009514912A JP 5599608 B2 JP5599608 B2 JP 5599608B2
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- JP
- Japan
- Prior art keywords
- bioactive glass
- glass
- bioactive
- molar ratio
- tissue
- 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.)
- Expired - Fee Related
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- RXSHXLOMRZJCLB-UHFFFAOYSA-L strontium;diacetate Chemical compound [Sr+2].CC([O-])=O.CC([O-])=O RXSHXLOMRZJCLB-UHFFFAOYSA-L 0.000 description 1
- QSQXISIULMTHLV-UHFFFAOYSA-N strontium;dioxido(oxo)silane Chemical compound [Sr+2].[O-][Si]([O-])=O QSQXISIULMTHLV-UHFFFAOYSA-N 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 230000008093 supporting effect Effects 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 208000011580 syndromic disease Diseases 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 238000010189 synthetic method Methods 0.000 description 1
- 239000006188 syrup Substances 0.000 description 1
- 235000020357 syrup Nutrition 0.000 description 1
- 230000001839 systemic circulation Effects 0.000 description 1
- 239000003826 tablet Substances 0.000 description 1
- 229940124597 therapeutic agent Drugs 0.000 description 1
- 230000001225 therapeutic effect Effects 0.000 description 1
- 238000007751 thermal spraying Methods 0.000 description 1
- 230000005086 tooth mineralization Effects 0.000 description 1
- 239000011573 trace mineral Substances 0.000 description 1
- 235000013619 trace mineral Nutrition 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 230000008733 trauma Effects 0.000 description 1
- DQWPFSLDHJDLRL-UHFFFAOYSA-N triethyl phosphate Chemical compound CCOP(=O)(OCC)OCC DQWPFSLDHJDLRL-UHFFFAOYSA-N 0.000 description 1
- JOPDZQBPOWAEHC-UHFFFAOYSA-H tristrontium;diphosphate Chemical compound [Sr+2].[Sr+2].[Sr+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O JOPDZQBPOWAEHC-UHFFFAOYSA-H 0.000 description 1
- 239000011240 wet gel Substances 0.000 description 1
- 230000029663 wound healing Effects 0.000 description 1
- XRASPMIURGNCCH-UHFFFAOYSA-N zoledronic acid Chemical compound OP(=O)(O)C(P(O)(O)=O)(O)CN1C=CN=C1 XRASPMIURGNCCH-UHFFFAOYSA-N 0.000 description 1
- 229960004276 zoledronic acid Drugs 0.000 description 1
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- C03C10/00—Devitrified glass ceramics, i.e. glass ceramics having a crystalline phase dispersed in a glassy phase and constituting at least 50% by weight of the total composition
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- C03C3/00—Glass compositions
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Description
Hench、Bioactive Ceramics、 in Bioceramics:Material Characteristics Versus In Vivo Behavior(P. Ducheyne & J.E.Lemons,Eds.,1988)、54〜71頁 Kokubo T,J. Biomed.Mater.Res. 1990;24;721−735 Warren、Clark&Hench、Quality Assurrance of Bioactive glass.sup.(R) Powders.23 J.Biomed.Mat.Res.−App.Biomat.201(1989)
実験例
ガラス特性を判定するために使用される試験は、以下の通りである。
45μm未満のガラス粉末、0.075mgを、pH7.25で50mlの溶液(水、トリス緩衝液又はSBF)に浸漬し、特段の指定のない限り、5、15、30、60、120、240及び480分間、1Hzのオービタルシェーカに配置した。ろ過溶液を、次いで、誘導結合プラズマ(ICP)分光器で分析し、ケイ素、カルシウム、ナトリウム及びカリウム濃度を測定した。
トリス−ヒドロキシメチルアミノメタン緩衝液を作製するために、USBiomaterial社(SOP−006)の標準調製法を用いた。7.545gのTHAMを、約400mlの脱イオン水で充填したメスシリンダ(フラスコ)に移した。THAMを溶解した後、22.1mlの2N HCLをフラスコに加え、次いで、脱イオン水で1000mlとし、37℃でpH7.25に調節した。
ガラス粉末を50mlのトリス緩衝溶液又はSBFに加え、37℃で撹拌した。一連の時間間隔で、サンプルを取り出し、イオン種の濃度を、周知の方法(例えば、Kokubo 1990)に従って、誘導結合プラズマ発光分析器を用いて測定した。
表1のガラス5の調製:
石英状の59.35gのシリカ、3.04gの五酸化リン、23.08gの炭酸カルシウム、34.07gの炭酸ストロンチウム、55.93gの炭酸ナトリウムを混合し、白金るつぼ中に配置し、1390℃で1.5時間溶解し、次いで、脱塩水(demineralised)に注ぎ、顆粒状のガラスフリットを得た。このフリットを振動ミルのグラウンドで乾燥させ、粉末を得た。粉末は、45ミクロンメッシュの篩を介して篩分けした。45ミクロン未満の粉末を0.075g、50mlの疑似体液に移した。表面での炭酸カルシウムアパタイト(HCA)層の形成能力は、生物活性材料の認識されているテストである。ガラスは、X線粉末回析及びフーリエ変換赤外線分光法によって、6時間未満でその表面にHCAが形成されるのが観察された。
表1のガラス12の調製:
石英状の59.35gのシリカ、3.04gの五酸化リン、54.54gの炭酸カルシウム、8.86gの炭酸ストロンチウム、13.99gの炭酸ナトリウム、18.24gの炭酸カリウム、4.88gの酸化亜鉛、2.42gの酸化マグネシウムを混合し、白金るつぼに移し、1440℃で1.5時間溶融し、次いで、脱塩水に注ぎ、顆粒状のガラスフリットを得た。このガラスフリットを、振動ミルのグラウンドで乾燥させ、粉末を得た。この粉末を45ミクロンメッシュの篩を介して篩い分けした。次いで、粉末を、50体積%の約200ミクロン懸濁重合化ポリ(メタクリル酸メチル)粉末で混合し、プレスした。最終的なペレットを、3℃/分で700℃まで加熱して、10分間保持することによって、焼成(fire)させた。最終的な材料は、X線回析で試験するとアモルファス状であり、多孔質の相互結合固体からなっていた。ペレットは、疑似体液に配置した場合、3日以内でペレット表面にHCAが形成されたのが観察された。
表1のガラス29の調製:
石英状の59.35gのシリカ、3.04gの五酸化リン、32.62gの炭酸カルシウム、48.15gの炭酸ストロンチウム、6.96gの炭酸ナトリウム、9.12gの炭酸カリウム、4.88gの酸化亜鉛、5.84gの酸化マグネシウムを混合し、白金るつぼに移し、1440℃で、1.5時間溶解し、次いで、脱塩水に注ぎ、顆粒状ガラスフリットを得た。このフリットを、次いで、振動ミルのグラウンドで乾燥させ、粉末を得た。この粉末は、45ミクロンメッシュ篩を介して篩い分けされる。次いで、Ti6Al4Vのコーティングは、アルコール中のガラス粉末を分散させ、上記金属に対して懸濁液をコーティングし、3℃/分の速度で加熱した880℃で、酸素のない環境下で焼成させ、15分間保持し、室温まで冷却した。このコーティングは、クラックがなく、金属に十分に結合していることがわかり、疑似体液中に置かれると、3日以内にその表面にHCAを形成することがわかった。
ネットワーク結合度は、Hill、J.Mater.Sci.Letts.,15,1122−1125(1996)に記載される方法に従って計算可能であるが、リンは、別個のオルトリン酸塩相として存在すると考えられており、ガラスネットワークの一部ではない。
表1のガラス1、2、3、5及び7を調製した。これらのガラスにおいて、0、2.5%、10%、50%、又は、100%のカルシウムが、ストロンチウムによって置換された。これは、以下の表2に記載される:
SAOS−2細胞(骨肉腫細胞株由来骨芽細胞)を、10%FBS、1%L−グルタミン(2mM)、1%抗生物質/抗真菌物質を含むDMEM培地で培養し、アルカリホスファターゼ(ALP)活性、石灰化、細胞生存率(MTS)アッセイを決定するために、0%、2.5%、10%、50%、又は、100%ストロンチウムを含む本発明の生物活性ガラス、又は、コントロールの細胞株に、シーディングし(10,000細胞/cm2)、細胞培養前に、37℃、5%の二酸化炭素中で、十分に添加されたDMEM培地で、生物活性ガラスを一晩培養した。
生物活性ガラスを用いて7日間培養後、ALP活性は、Ball et al,Biomaterials,2001,22(4):337−347に記載されるように測定される。所定時間に亘り、ALP活性(mM)を、DCタンパク質アッセイ(Bio−Rad、英国)で測定する際にサンプル中のタンパク質、mgあたりで計算した。ストロンチウムなしと比べて、2.5%及び50%のストロンチウムを具える生物活性ガラスで培養するとき、骨芽細胞様細胞を観察して、より大幅にALPが生じた。ALP活性の増大は、骨芽細胞から成熟ミネラル化表現型への分化に関連している。
石灰化の活性部位を特定するために、テトラサイクリンラベルを、Holy et al,Biomed.Mater.Res.,2000,51(3):376−382に記載されるように適用した。SAOS細胞を、27日間、ストロンチウム含有生物活性ガラスで(上述のように)培養した。次いで、固定し、蛍光顕微鏡を用いて分析する前に、テトラサイクリン(1μM)を24時間加えた。石灰化の増大が、2.5%及び50%のストロンチウムを具える生物活性ガラスで観察された。このことは、生物活性ガラス組成物(2.5%及び50%)で観察されるアルカリフォスファターゼ活性の増大に一致する。
MTT細胞生存率アッセイ(Gerlie et al,J.Immunol.Meth.94(1−2):57−63、1986、Sigma(cat.5655−500MG)から入手可能な試薬を用いる):チアゾイルブルーテトラゾリウム(Thiazolyl Blue Tetrazolium)臭化物)は、ストロンチウムを具える生物活性ガラスが細胞増殖をかなり刺激することを明らかにした。
実験工程
本発明によるガラスは、当分野で周知のゾルゲル技術で調製可能である。本発明によるガラスを形成するために、米国特許第5,074,916号に記載されている方法を修正し、この修正した方法を以下に記載する。
上記表1に示されるガラス28〜32を、メルトクエンチ技術を用いて調製した。平均粒径が5〜6ミクロンで、38ミクロン未満の粒径を有するように調製されたガラスを、重量比が1:10で、このガラスと、分子量が50,000〜100,000の1%ポリ(メチルメタクリレート)クロロホルムを混合することによって、Ti6Al4V合金シートでコーティングした(例えば、Ti6Al4V股関節(hip)インプラント用のモデルとして作用する)。この合金シート(プロテーゼの大腿骨ステム)を、クロロホルムガラス懸濁液に浸漬し、ゆっくり引き上げ、クロロホルムを蒸発させた。次いで、このシート(又はプロテーゼ)を、750℃まで2〜60℃/分で加熱し、30分間保持し、室温に冷却する前に、真空下で焼結させる。コーティングシートは、50〜300ミクロンの厚さの浸漬された領域の上に光沢のある生物活性コーティングを有する。疑似体液に移されると、コーティングは、3日以内で、ヒドロキシカルボネートアパタイト層の沈積が確認される。この技術を、Al2O3及びジルコニアなど、他の合金及びセラミックに適用することができる。
最適な生物活性は、骨結合を促進するのに必要とされる。しかしながら、体内で長期間経た後、Ti6Al4Vがコーティングされたままであることも望ましい。この理由に関しては、ベースガラス層の反応性が低く、トップコート層の反応性が高いことが望ましい。この文脈において、反応性の低いガラスは、生物活性がより低く、化学的安定性がより高く、反応性が高いガラスは、生物活性がより高く、化学的安定性がより低い。このようなコーティングは、以下にまとめた2ステッププロセスによって製造可能である。
クロムコバルトの二層コーティングは、コバルトニッケル及びクロムが、保護的酸下層から、ガラスから放出される可能があるガラスにたくさん溶解することができるので、特に望ましい。この理由に関して、化学的に安定なベースコーティングガラス組成物が好ましい。
Claims (19)
- SrとSiO2 とを含む、溶融法で作製した生物活性ガラスであって、該ガラスが:
40%ないし57%のモル比のSiO 2 と;
0.2%ないし45%のモル比のSrOと;
0.5%ないし8%のモル比のP 2 O 5 と;
5%ないし30%のモル比のCaOと;
0%ないし30%のモル比のNa 2 Oと;
0%ないし30%のモル比のK 2 Oと;
を含むことを特徴とする生物活性ガラス。 - 請求項1に記載の生物活性ガラスが、5%ないし28%の混合モル比のNa 2 OとK 2 Oとを含むことを特徴とする生物活性ガラス。
- 請求項1に記載の生物活性ガラスが、Na、K、Mg、Zn、B2O3、F又はAgの1以上の供給源を更に含むことを特徴とする生物活性ガラス。
- 請求項3に記載の生物活性ガラスにおいて、前記FがCaF 2 、SrF 2 、MgF 2 、NaF又はKFの1以上として提供され、CaF 2 、SrF 2 、MgF 2 、NaF及びKFの混合モル比が0%ないし50%であることを特徴とする生物活性ガラス。
- 請求項3又は4に記載の生物活性ガラスが:
0%ないし40%のモル比のMgO;
0%ないし10%のモル比のZnO;
0%ないし15%のモル比のB2O3;
の1以上を含むことを特徴とする生物活性ガラス。 - 請求項5に記載の生物活性グラスにおいて、該ガラスが:
(a)46%ないし50%のSiO2と;
0.5%ないし1.5%のP2O5と;
0%ないし2%のB2O3と;
5%ないし23%のCaOと;
0.5%ないし24%のSrOと;
6%ないし27%のNa2Oと;
0%ないし13%のK2Oと;
0%ないし2%のZnOと;
0%ないし2%のMgOと;
0%ないし7%のCaF2と;
を含むか、あるいは:
(b)49%ないし50%のSiO2と;
0.5%ないし1.5%のP2O5と;
8%ないし30%のCaOと;
8%ないし17%のSrOと;
3%ないし7%のNa2Oと;
3%ないし7%のK2Oと;
3%のZnOと;
7%ないし16%のMgOと;
0%ないし6%のCaF2と;
を含むことを特徴とする生物活性グラス。 - 請求項1ないし6のいずれに記載の生物活性ガラスにおいて、SiO2、P2O5 、及びB2O3 の混合モル比が60%を超えず、かつ/あるいは、SrO、CaO、MgO、Na2O、及びK2Oの混合モル比が40%ないし60%であることを特徴とする生物活性ガラス。
- 請求項1ないし7のいずれかに記載の前記生物活性ガラスが、粒子形状であるか、繊維として提供されるか、あるいはディスク形状又はモノリシック形状の固体を含むことを特徴とする生物活性ガラス。
- 請求項1ないし8のいずれかに記載の生物活性ガラスの製造プロセスであって、Sr及びSiO2、及び、選択的にNa、K、Ca、P2O5、Mg、Zn、B2O3、F又はAgの1以上を混合するステップを具えることを特徴とする製造プロセス。
- 請求項1ないし8のいずれかに記載の生物活性ガラスが、組織の損傷の予防及び/又は治療に用いられるか、骨の代替物として用いられるか、骨の自家移植体の伸長に用いられるか、あるいは歯周病、歯のキャビティ、脱塩化した歯、歯の知覚過敏、椎骨形成法、骨折の予防及び/又は治療のために用いられることを特徴とする生物活性ガラス。
- 請求項10に記載の生物活性ガラスにおいて、前記組織が骨又は歯の組織であることを特徴とする生物活性ガラス。
- 請求項10又は11に記載の生物活性ガラスにおいて、前記予防及び/又は治療がヒドロキシカルボネートアパタイト析出の速度を増加させるステップを具えることを特徴とする生物活性ガラス。
- 請求項1ないし8のいずれかに記載の生物活性ガラスを含むことを特徴とするインプラントコーティング。
- 請求項13に記載のコーティングにおいて、当該コーティングが2以上の層を具え、少なくとも1の層が請求項1ないし8のいずれかに記載の生物活性ガラスを含むことを特徴とするコーティング。
- 請求項13又は14に記載のコーティングでコーティングすることを特徴とするインプラント。
- 請求項15に記載のインプラントが、関節置換手術に用いられることを特徴とするインプラント。
- 請求項1ないし8のいずれかに記載の生物活性ガラスを含むことを特徴とする組成物。
- 請求項17に記載の組成物が、組織損傷の予防及び/又は治療に用いられることを特徴とする組成物。
- 請求項17又は18に記載の組成物において、当該組成物が骨セメント、歯科用複合材料、分解性ポリマ、生物活性多孔性足場、練り歯磨き、デオドラント、骨代替物、粉末、生物活性ガラスを充填したアクリル、生物活性ガラスを充填したポリ乳酸、生物活性ガラスを充填したBis GMA若しくは歯科用複合材料、生物活性ガラス顆粒若しくは焼成した生物活性ガラス、又はインプラントコーティングであることを特徴とする組成物。
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PCT/GB2007/002262 WO2007144662A1 (en) | 2006-06-16 | 2007-06-15 | Bioactive glass |
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JP2020158318A (ja) * | 2019-03-25 | 2020-10-01 | 太平洋セメント株式会社 | 歯科用ケイ酸塩−リン酸塩系ガラス材料 |
JP7165610B2 (ja) | 2019-03-25 | 2022-11-04 | 太平洋セメント株式会社 | 歯科用ケイ酸塩-リン酸塩系ガラス材料 |
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WO2007144662A1 (en) | 2007-12-21 |
CN101500622A (zh) | 2009-08-05 |
KR20090037889A (ko) | 2009-04-16 |
US20090208428A1 (en) | 2009-08-20 |
EP2037973A1 (en) | 2009-03-25 |
JP2009539755A (ja) | 2009-11-19 |
AU2007258943A1 (en) | 2007-12-21 |
CN104876439A (zh) | 2015-09-02 |
BRPI0711988A2 (pt) | 2012-03-06 |
GB0612028D0 (en) | 2006-07-26 |
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