水熱処理によるリン酸カルシウム結晶化ガラスの骨様アパタイト生成能の向上

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  • Enhancement of Biomimetic Apatite Forming Ability of Calcium Phosphate Glass-Ceramic by a Hydrothermal Treatment
  • Ceramic letter Enhancement of Biomimetic Apatite Forming Ability of Calcium Phosphate Glass-Ceramic by a Hydrothermal Treatment

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60CaO·30P2O5·7Na2O·3TiO2 glass-ceramic, which consists of crystalline β-Ca3(PO4)2 and β-Ca2P2O7 phases with a small amount of glassy calcium phosphate phase including sodium and titanium ions, has an apatite-forming ability in simulated body fluid (SBF) at 37°C; on the glass-ceramic, the bonelike apatite forms after 20 days of soaking in SBF. In the present work, the apatite-forming ability in SBF of the glass-ceramic was enhanced by a hydrothermal treatment in water at 140°C for 1h; the glass-ceramic was completely covered with bonelike apatite after 10 days of soaking. The phosphate glassy phase around the surface dissolved drastically during the treatment but almost no titanium ion dissolved. X-ray photoelectron spectroscopic analysis implied that the hydrated titania groups, which may induce nucleation of the apatite, form newly around the surface during the treatment.<br>

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