A gravity sintering fabrication technique has been developed for producing Co-Cr-Mo alloy dental implants having a porous coating on the root portion. This process allows for control of pore structure enabling ingrowth of either bone or fibrous tissue.Co--Cr--Mo-based alloy which is superior in compatibility with a living body, corrosion resistance, and wear resistance, and a low magnetic susceptibility which does not exert harmful effects on magnetic resonance image (MRI) for medical examination diagnosis. Their biocompatibility is closely linked to the high resistance towards corrosion thanks to the spontaneous formation of a passive oxide film with elevated chemical and mechanical stability.
Histologic and microradiographic sections revealed extensive mineralized bone growth deep into the pores of all implant types and often extending to the core of the one-, two- and three-layered porous-coated implants. Both mature haversian bone and less mature woven bone were found within the porous structure. Extensive but incomplete bone infiltration was found in the totally porous implants, with the remainder of the porosity filled with macrophage-laden connective tissue.