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Hydroxyapatite coating (HA-C) material has been applied as orthopedic and dental implant, and we have investigated several properties of hydroxyapatite coating (HA-C) on titanium (Ti) substrate. Recently, in order to shorten the period until osteointegration and to increase the bone contact rate, surface modification of Ti and its alloys have been reported. However, Ti was used as a substrate in this study. Ti surface was modified by concentrated NaOH solution and subsequent heat treatment. The surface modified substrate was soaked into calcium and phosphate solutions to obtain apatite coating layer. The obtained layer was verified to hydroxyapatite (HA) by fourier-transform infrared spectroscopy (FT-IR) and thin-film X-ray diffractometry (TF-XRD). The bioactivity of this coating layer has been confirmed by the simulated body fluid (SBF) immersion. (Received June 30, 2004; Accepted August 30, 2004)

HYDROXYAPATITE COATING AND SBF IMMERSION TEST OF SURFACE MODIFIED TITANIUM BY WET CHEMICAL METHOD