抄録
JIS types 2 and 4 titanium and Ti-6Al-4V alloy have been used for dental implantation. Because of the carcinogenicity of vanadium, the use of Ti-6Al-7Nb alloy containing niobium with easy passive state has been evaluated. To develop more suitable implant materials, we performed basic experiments to compare the mechanical properties of JIS types 2 and 4 titanium, Ti-6Al-4V alloy,and Ti-6Al-7Nb alloy. As a result, proof strength and hardness were highest in Ti-6Al-4V, and lowest in JIS type 2 titanium. Surface analysis showed that the oxygen concentration was higher in JIS type 4 than in type 2 titanium. Fine precipitates of vanadium and niobium were observed in Ti-6Al-4V and Ti-6Al-7Nb alloys, respectively. Other components were evenly distributed. As for Ti-6Al-7Nb alloy, the results of hardness and proof strength showed that it could be used as an implant material. It is thought that in vivo tests are necessary in the future.
