Element release of casting Ti-24Nb-4Zr-7.9Sn alloy in vitro

CHENG Yi-cheng; ZHANG Chun-bao; HU Jiang; TANG Chang-bin; GAO Bo

Abstract：AIM: To evaluate the elements release of casted Ti-24Nb-4Zr-7.9Sn alloy in different simula-ted body fluids. METHODS : Twenty specimens of casting Ti-24Nb-4Zr-7.9Sn alloy were allocated into four groups and immersed in artificial saliva, lactic acid solution, neutral fluoride solution and acidic fluoride solution for 7 days re-spectively. Casting pure titanium was used as control. The element release was measured by ICP-MS, and the changes of metal surface were observed with scanning electron microscope (SEM). RESULTS: ①The total element release from casting Ti-24Nb-4Zr-7.9Sn alloy was lower than that of casting pure titanium in the same kind of simulated body fluids.②The element release in acidic fluoride solution was the highest, followed by neutral fluoride solution, lactic acid solution, and artificial saliva in order of lesser degree.③ SEM showed that the casting Ti-24Nb-4Zr-7.9Sn al-loy had a better signs of corrosion resistance in comparison to the casting pure titanium in the same kind of simulated body fluids.④7 days after immersion in acidic fluoride solution,the main corrosion products on Ti-24Nb-4Zr-7.9Sn alloy were Na_2TiF_6, Na_2NbF_6, Na_2ZrF_6 and Na_2SnF_6, while the main corrosion products on pure titanium were Na_2TiF_6, Na_2TiF_6 and Na_3TiOF_5. CONCLUSION: Casting Ti-24Nb-4Zr-7.9Sn alloy has a good corrosion resist-ance, and could be met the request of dental material.