Formation of bonelike apatite is an essential prerequisite forimplants to make direct bond to living bone. The apatiteformation can be assessed in vitro using a simulated body fluid(SBF) that has almost equal compositions of inorganic ions tohuman blood plasma. In this study, Ti coatings were preparedby vacuum plasma spraying, and then they were treated byNaOH aqueous solution, immersed in distilled water, heated at600oC in a furnace. Microstructure and bioactivity of thesurface modified Ti coatings were examined by SEMobservation and SBF test respectively. The results obtainedrevealed that a net-like structure comprising of manymicropores was present on the surfaces of the treated Ticoatings. After immersed in SBF, apatite layer was formed ontheir surfaces, suggesting that the surface modification coatingshave good bioactivity.
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