Jing-Ying ZHANG
. 2015, 46(04): 26-0.
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ABSTRACT Titanium (Ti) and its alloys have been used widely as implants due to their excellent mechanical toughness, strength, corrosion resistance and biocompatibility. However, they exhibit poor osteoinductive properties because of their bioinert character. To improve their bioactivity, numerous techniques have been elaborated to enhance the surface compatibility of implants with bone. Ti and Ti6Al4V are mostly used in the aerospace, marine and biomedical industries, occupied 50% of the titanium market. However, Ti has low strength and undergoes physical abrasion due to oral prophylaxis and other processes in oral cavity. Furthermore, the grey color of Ti can cause aesthetic problems when it is inadequately masked by soft tissue at gingival area. Ti6Al4V began to lose its popularity in the late 1980s after recognition of toxicity arising from in-vivo release of vanadium present in the composition. To overcome these drawbacks, Ti6Al7Nb alloy has been developed specifically for implant applications by substitution of vanadium with niobium. In the present study, the in-vitro biological responses to Ti、Ti6Al4V and Ti6Al7Nb were investigated after modifying their surfaces by sandblasting and acid etching (SLA). The SLA process was sandblasted by Al2O3 particles and acid etched by a mixture of hydrochloric acid and sulfuric acid. After the process, the surfaces of the samples were porous of micro meters. Simulated body fluid (SBF) tests were conducted to compare the biological performance of the samples. The sample surface morphologies were characterized by SEM, Surface crystal structure of the samples was analyzed by using an X- ray diffractometer (XRD). Even though micro structure of the samples exhibited somewhat similar, the deposition of calcium (Ca), and phosphate (P) on the surface of Ti6Al7Nb alloy was faster and greater than that of the Ti and Ti6Al4V, which is significant for implant surface modification.