Preparation Bioceramic Film On Titanium By Micro Arc Oxidation-hydrothermal Treatment And Study Of Cytocompatibility

Titanium and Titanium alloy were used widely as implant material in dentistry and orthopedics because of their excellent mechanical characters. However, the synostosis between them and the bone was mechanical but not chemical. Simultaneously, titanium was easy to release ion to body because corrosion in physiological environment. All of these limited the clinical achievement ratio and widespread development of implant technique. So to perfect their biological property, the modification of Ti surface attracted more and more people. MAO is a novel technique to deposit ceramic coatings on the surface of valve metals and their alloys. By applying a positive voltage to a Ti specimen immersed in electrolyte, anodic oxidation of Ti occurs to form a TiO₂ layer on the surface. The newly formed TiO₂ layer is both porous and firmly adhered to the substrate, which is beneficial for the biological performance of the implants. Another advantage of MAO process is the possibility of incorporating Ca and P ions into the surface layer, by controlling the composition and concentration of the electrolyte. The incorporated Ca and P ions were even crystallized into hydroxyapatite or other calcium phosphates by a hydrothermal treatment. In this thesis, we used the micro-arc oxidation...