Abstract: Objective To study the effect of alkali-and-heat treatment combined with ultraviolet irradiation on properties of titanium surface and the ability of inducing hydroxyapatite(HA) deposition. Methods The specimens were divided into three groups, which were treated by sandblast and acid-etch(SLA),SLA with alkali-and-heat treatment(AAH), AAH with ultraviolet irradiation(UV). The physicochemical properties of these titanium were tested. HA deposit was examined by SEM with EDX and X-ray diffraction(XRD) after simulated body fluid(SBF) immersion test. Results Rough morphology with multilevel holes was formed on titanium after acid-alkali-heat treatment and ultraviolet irradiation. UV showed the best water contact angle,approximately 0°. Besides,calcium and sodium were induced in UV group. HA deposit was found on the specimen surfaces after SBF immersion test with the largest amount and fastest speed. Conclusions The titanium after alkali-and-heat treatment combined with ultraviolet irradiation has suitable bioactivity in vitro.

Key words: titanium implant, surface modification, ultraviolet irradiation, alkali-and-heat treatment, simulated body fluid