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Abstract
The osseointegration capability of titanium implants is related to their chemical composition and surface roughness. The combination of grit-blasting and micro-arc oxidation had been used to produce the improved implant surfaces. The ceramic particles were projected to titanium implants at high velocity to get high surface roughness. Then the surface of implants was modified by micro-arc oxidation treatment. A porous TiO2 layer was formed on the surface after the oxidation treatment. The surface structure of oxidized implants exhibited nanometer-sized pores with an average diameter of 0.2 µm. The TiO2 passive layer of the implant surface can attribute to the excellent biocompatibility. The high roughness (R a = 0.182 µm) formed by grit-blasting maximizes the interlocking between mineralized bone and the surface of implants. Surface roughness in the manometer range formed by micro-arc oxidation would play an important role in the adsorption of proteins, adhesion of osteoblastic cell and thus the rate of osseointegration.