Mechanical Properties of Ti and Ti Alloy as Compared to Bone 

Titanium tends to seize when in sliding contact with itself or other metal. Titanium based alloys have a high co-efficient of friction which can cause problems. Wear particles are formed in a piece of bone if a piece of bone rubs against the implant or if two parts of an implant rub against one another. Therefore , abutment screws are sometimes coated with other materials.

Titanium alloy is 4 times stronger than Grade I CPTi and almost 2 times stronger than Grade IV CPTi. Ultimate strength and fatigue strength are primary considerations given the ramifications of dental implant body and component fractures. The modulus of elasticity of the four different grades of CPTi is similar (103 GPa) and is only slightly higher in Ti-6Al-4V (113 GPa). Hence, although a significant difference exists in the strength between grades of CPTi and its alloy, the elastic modulus is similar which is about 6 times that of cortical bone (the closest between all biomaterials).