Abstract
Recently the titanium alloys have been designed for use in dentistry. Although the Ti-6Al-4V alloy has been brought into the market as a dental casting alloy, problems remain in the biocompatibility of vanadium and in the mechanical properties as well as the castability. The Ti-6Al-7Nb alloy was developed as a biomedical alloy by replacing vanadium in the Ti-6Al-4V alloy with niobium.Previously, we found that the Ti-6Al-7Nb alloy had suitable properties as a material for dental casting through a casting test and mechanical test. In this study, a long-term dipping test was carried out using the cast specimens made of titanium, Ti-6Al-4V and Ti-6Al-7Nb alloys in 1.0% lactic acid in order to evaluate their corrosion resistance in a physiological atmosphere. The amount of titanium ion released from Ti-6Al-7Nb alloy was less than that from the Ti-6Al-4V alloy and comparable to that from titanium.
