Osteoconductivity of Titania/Hydroxyapatite Composite Films Formed Using Pulse Electrolysis

  • Kuroda Kensuke
    Department of Materials Science & Engineering, Graduate School of Engineering, Nagoya University
  • Shidu Hironobu
    Department of Materials Science & Engineering, Graduate School of Engineering, Nagoya University
  • Ichino Ryoichi
    Department of Materials Science & Engineering, Graduate School of Engineering, Nagoya University
  • Okido Masazumi
    Department of Materials Science & Engineering, Graduate School of Engineering, Nagoya University
  • Seki Azusa
    Hamri Co., Ltd.

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Other Title
  • パルス電解法により作製したチタニア/水酸アパタイト複合膜の骨伝導性評価
  • パルス デンカイホウ ニ ヨリ サクセイシタ チタニア スイサン アパタイト フクゴウマク ノ コツ デンドウセイ ヒョウカ

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Abstract

  Titania (TiO2)/hydroxyapatite (HAp) composite films were prepared on commercial pure titanium rods (2 mm in diameter, 5 mm in length) by anodic-cathodic pulse electrolysis in an aqueous solution consisting of 0.3 mM Ca(H2PO4)2 and 0.7 mM CaCl2 and pH=5.5. The electrolysis was carried out in an autoclave at 120°C for 30 min. using +8.7 V vs. Ag/AgCl sat. KCl as the anodic potential and -9.3 V as the cathodic potential, and changing the electrolysis cycle (60~600 s) and duty ratio. We obtained TiO2/HAp composite films in which fine HAp particles were uniformly dispersed on a thin TiO2 layer. The coated rods were implanted in the tibiae of 10-week-old male rats. The constructs were retrieved 14 d postimplantation and examined for new bone formation and tissue response in the cancellous and cortical bone. They were compared with HAp-coated titanium rods, TiO2-coated rods (anodizing in an aqueous solution), TiO2/HAp-coated rods formed by the high temperature oxidization of specimens coated with HAp by cathodic electrolysis, and uncoated titanium rods. Fourteen days after implantation, new bone had formed on all the coated samples (HAp, TiO2, and TiO2/HAp) and noncoated titanium rods in the cancellous bone and cortical bone. In particular, TiO2/HAp composite films prepared by pulse electrolysis had very high osteoconductivity in the part of cortical bone, which resulted from a synergistic effect of HAp and TiO2 on the bioactivity.<br>

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