Abstract
Needle-like apatite crystals were formed on pure titanium plate by a hydrothermal-electrochemical method at 100-200°C in an electrolyte containing calcium and phosphate ions. The width and length of the apatite needles increased with the electrolyte temperature. The aspect ratio of the apatite decreased with it. Pure titanium plates with the hydrothermal-electrochemically coated apatite at 100-200°C were soaked in a simulated body fluid from 3 to 27 weeks at 37°C. After soaking, the changes in weight of the specimens were measured, and the surfaces of the specimens were characterized. The specimens having fine apatite needles formed at 100°C showed the largest weight gain due to the deposition of the carbonate containing apatite having low crystallinity.
