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Bioactivation of oxide ceramics and clarification of the strength degradation mechanism

Research Project

Project/Area Number 19H02030
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Review Section Basic Section 18010:Mechanics of materials and materials-related
Research InstitutionTokyo Metropolitan University

Principal Investigator

Kobayashi Satoshi  東京都立大学, システムデザイン研究科, 教授 (80326016)

Project Period (FY) 2019-04-01 – 2022-03-31
Project Status Completed (Fiscal Year 2021)
Budget Amount *help
¥17,680,000 (Direct Cost: ¥13,600,000、Indirect Cost: ¥4,080,000)
Fiscal Year 2021: ¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
Fiscal Year 2020: ¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2019: ¥9,750,000 (Direct Cost: ¥7,500,000、Indirect Cost: ¥2,250,000)
Keywordsイオン注入 / 生体活性 / 酸化物セラミックス / 表面処理
Outline of Research at the Start

酸化物セラミックスに生体活性能を付与することで,治療期間の短縮が可能で良好な予後が得られる高付加価値な歯・骨インプラントの開発のための基礎技術の確立を目指す.ジルコニアを母材とした高強度複合材料を用い,表面にCaイオンを注入する事で骨類似アパタイトの成長の促進,すなわち生体活性を付与することを目指す.このため,イオン注入条件であるイオン注入量・注入深さと強度低下の関係を解明し,最適化を図ることで生体活性の付与に伴う強度低下を極力抑制する.具体的には,擬似体液浸漬後の最低曲げ強度1200 MPa以上,ワイブル係数10以上,骨類似アパタイト形成速度0.25 μm/dayを目指す.

Outline of Final Research Achievements

We have developed a method to impart bioactivity by immersing a zirconia material (3Y-TZP, ATZ) in a solution of NaOH or H3PO4 at 95 C for 7 days. The amount of apatite formed was higher with H3PO4 treatment than with NaOH. In particular, on 3Y-TZP treated with H3PO4, almost the entire surface was covered with an apatite layer, showing high apatite forming ability. In addition, a biaxial bending test and measurement of the monoclinic crystal ratio, which is an index of zirconia deterioration, were performed. As a result, the biaxial bending strength of 3Y-TZP and ATZ materials did not decrease even after treatment with NaOH or H3PO4, but about 30% of tetragonal zirconia was transformed into monoclinic crystals. Therefore, a zirconia material that can suppress deterioration and a treatment method thereof are desired.

Academic Significance and Societal Importance of the Research Achievements

アルミナやジルコニアといった酸化物セラミックスは,機械的特性に優れ耐摩耗特性なども有し,生体組織と有害な反応を起こさないが,逆に生体活性に乏しい,本研究により,生体活性発現のメカニズムが明らかとなり,また,そのメカニズムに基づき,酸化物セラミックス表面に対し,選択的に生体活性を付与することを可能とする手法が開発されたことは,今後の表面処理技術開発における指針を与えるものであり,学術的に意義があると考えられる.また,単一材料での大規模骨欠損の治療への適用可能性が明らかとなった.これにより患者のQuality of Lifeの向上に寄与することが期待され,社会的意義も深いと考える.

Report

(4 results)
  • 2021 Annual Research Report   Final Research Report ( PDF )
  • 2020 Annual Research Report
  • 2019 Annual Research Report
  • Research Products

    (14 results)

All 2022 2021 2020 2019

All Journal Article (1 results) (of which Peer Reviewed: 1 results) Presentation (13 results) (of which Int'l Joint Research: 5 results)

  • [Journal Article] Effect of bioactivation through acid/alkali process on the flexure strength of zirconia-based ceramics and composites2022

    • Author(s)
      Kojima Riku、Osada Toshiko、Kobayashi Satoshi
    • Journal Title

      Advanced Composite Materials

      Volume: 31 Issue: 5 Pages: 1-12

    • DOI

      10.1080/09243046.2022.2042914

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed
  • [Presentation] ハイドロキシアパタイト-アルミナ複合多孔体の焼結挙動および力学的特性評価2022

    • Author(s)
      図所優羽,小林訓史
    • Organizer
      日本機械学会第32回バイオフロンティア講演会
    • Related Report
      2021 Annual Research Report
  • [Presentation] Characterization of Osteogenesis For Calcium Phosphate Ceramics - Alumina Composite Porous Scaffolds2022

    • Author(s)
      Yu Zusho, Hiromi Miyoshi, Naoya Sakamoto, Satoshi Kobayash
    • Organizer
      6th Asian Symposium on Materials and Processing
    • Related Report
      2021 Annual Research Report
  • [Presentation] Characterization of mechanical properties and osteogenesis for hydroxyapatite-alumina composite porous scaffolds2022

    • Author(s)
      Yu Zusho, Hiromi Miyoshi, Naoya Sakamoto, Satoshi Kobayash
    • Organizer
      46th International Conference and Expo on Advanced Ceramics and Composite
    • Related Report
      2021 Annual Research Report
  • [Presentation] Effect of Bioactivation Using Acid or Alkaline Treatment on Mechanical Properties of Zirconia-Based Ceramics2022

    • Author(s)
      Riku Kojima, Masataka Ijiri, Toshiko Osada, Satoshi Kobayashi
    • Organizer
      46th International Conference and Expo on Advanced Ceramics and Composites
    • Related Report
      2021 Annual Research Report
  • [Presentation] ハイドロキシアパタイト-アルミナ複合多孔体スキャフォールドの作製および力学的特性評価2021

    • Author(s)
      図所優羽,長田稔子,小林訓史
    • Organizer
      日本機械学会2021年度年次大会
    • Related Report
      2021 Annual Research Report
  • [Presentation] ハイドロキシアパタイト-アルミナ複合多孔体の力学的特性に及ぼす気孔サイズの影響2021

    • Author(s)
      図所優羽,長田稔子,小林訓史
    • Organizer
      日本機械学会M&M2021材料力学カンファレンス
    • Related Report
      2021 Annual Research Report
  • [Presentation] ハイドロキシアパタイト-アルミナ複合多孔体スキャフォールドにおける骨芽様細胞の増殖および石灰化挙動2021

    • Author(s)
      図所優羽,三好洋美,坂元尚哉,小林訓史
    • Organizer
      日本機械学会第29回機械材料・材料加工技術講演会
    • Related Report
      2021 Annual Research Report
  • [Presentation] Effect of pore size on mechanical properties for hydroxyapatite porous body coated with poly(lactic acid)2021

    • Author(s)
      Yu Zusho, Satoshi Kobayashi, Toshiko Osada
    • Organizer
      45th International Conference and Expo on Advanced Ceramics and Composites(国際会議)
    • Related Report
      2020 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Effect of Chemical Bioactivation Treatment on Mechanical Properties for ZrO2 and Al2O3/ZrO2 Composites2021

    • Author(s)
      Riku Kojima, Satoshi Kobayashi, Toshiko Osada
    • Organizer
      45th International Conference and Expo on Advanced Ceramics and Composites(国際会議)
    • Related Report
      2020 Annual Research Report
    • Int'l Joint Research
  • [Presentation] ZrO2とAl2O3/ZrO2の化学的生体活性化処理が力学的特性に及ぼす影響2020

    • Author(s)
      小島 陸, 小林 訓史, 長田 稔子
    • Organizer
      第31回バイオフロンティア講演会
    • Related Report
      2020 Annual Research Report
  • [Presentation] Fabrication and characterization of hydroxyapatite/poly(lactic acid) porous scaffolds2019

    • Author(s)
      Satoshi Kobayashi, Yu Zusho, Toshiko Osada
    • Organizer
      2nd Global Forum on Advanced Materials and Technologies for Sustainable Development
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Biomaterials with bioactive function and biomaterial with antimicrobial function2019

    • Author(s)
      Hikaru Muto, Satoshi Kobayashi
    • Organizer
      2nd Global Forum on Advanced Materials and Technologies for Sustainable Development
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Effect of sintering temperature condition on the mechanical properties of hydroxyapatite2019

    • Author(s)
      Satoshi Kobayashi, Tomomi Izawa
    • Organizer
      The 13th Pacific Rim Conference of Ceramic Societies
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research

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Published: 2019-04-18   Modified: 2023-01-30  

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