Fabrication and Mechanical Properties of Porous Ti/HA Composites for Bone Fixation Devices

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  • Nomura Naoyuki
    Institute of Biomaterials and Bioengineering, Tokyo Medical and Dental University, Tokyo Medical and Dental University
  • Sakamoto Kozue
    Department of Life and Environmental Science, Faculty of Engineering, Chiba Institute of Technology
  • Takahashi Katsuya
    Department of Life and Environmental Science, Faculty of Engineering, Chiba Institute of Technology
  • Kato Seiji
    Department of Life and Environmental Science, Faculty of Engineering, Chiba Institute of Technology
  • Abe Yasunori
    Faculty of Dentistry, Tokyo Medical and Dental University, Tokyo Medical and Dental University
  • Doi Hisashi
    Institute of Biomaterials and Bioengineering, Tokyo Medical and Dental University, Tokyo Medical and Dental University
  • Tsutsumi Yusuke
    Institute of Biomaterials and Bioengineering, Tokyo Medical and Dental University, Tokyo Medical and Dental University
  • Kobayashi Masahiro
    Department of Life and Environmental Science, Faculty of Engineering, Chiba Institute of Technology
  • Kobayashi Equo
    Department of Metallurgy and Ceramics Science, Graduate School of Engineering, Tokyo Institute of Technology
  • Kim Woo-Jong
    Department of Dental Biomaterials, School of Dentistry, Kyungpook National University
  • Kim Kyo-Han
    Department of Dental Biomaterials, School of Dentistry, Kyungpook National University
  • Hanawa Takao
    Institute of Biomaterials and Bioengineering, Tokyo Medical and Dental University, Tokyo Medical and Dental University Graduate School of Engineering, The University of Tokyo

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Porous Ti (pTi)/hydroxylapatite (HA) composites were fabricated by an infiltration method in a vacuum and sintering. The Young’s modulus of the composites was evaluated before and after the immersion in Hanks’ solution. The strength of the composites was also evaluated by four-point bending test. The Young’s modulus of the compacts was governed by the porosity and was comparable to the human bone in the porosity range from 24 to 34%. The Young’s modulus of sintered pTi/HA composites was larger than that of pTi. The Young’s modulus of the sintered pTi/HA composites decreased after immersion in Hanks’ solution. The proof and bending strengths of the sintered pTi/HA composites were larger than those of pTi. Solid solution hardening of Ti by oxygen contributed the increase of the proof strength.

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