Influence of surface properties on bioactivity and pull-out torque in cold thread rolled Ti rod—Development of bioactive metal-forming technology

An advanced thread rolling technology is proposed for manufacturing implant surface with high bioactivity and controlling its pull-out torque. 5 kinds of surface roughness are produced on the surface of titanium rods in thread rolling using parallel dies with micro asperity. Subsequently, bioactive titania film is coated on the surface of the rods using anodizing. The resulting products are implanted in tibias of rats and observed for 2 weeks. The amount of bone formation on the rods and its pull-out torque are measured. As the results, the influences of the surface morphology and the anodizing on osteoconductivity property are clarified.