抄録
Biological apatite, in bones and teeth as hard tissue in human body, contains a few carbonate ions. Therefore, it isn't completely equal to stoichiometric hydroxyapatite (HA). Chemical solubility for an HA ceramic is especially affected to the carbonate ions in lattice. The purpose of this work has been the investigation of the electrical polarization effect on B-type carbonated hydroxyapatite (CHA) ceramics. B-type CHA was synthesized by wet chemical method, and the CHA was sintered at 800°C in carbon dioxide atmosphere. From result of FTIR analyses were shown the carbonate absorption bands belong to substitution for phosphate site (B-type) in the CHA ceramics. The CHA ceramics were polarized with voltage in various high temperatures, and analyzed to estimate the electrical stored charged in the polarized CHA ceramics by thermally stimulated depolarization current (TSDC) measurement. The TSDC spectra of the CHA ceramics showed the maxim current density around at 450-550°C, respectively. Bioactivities of the polarized CHA ceramics were evaluated by deposition of bone-like apatites crystals in simulated body fluid (SBF). The SBF immersion test demonstrated that positively charged surface of the CHA ceramic accelerated deposition of the bone-like apatites compared with that of non-polarized CHA ceramic.
