Objective To investigate the biocompatibility of pure titanium(Ti) and Ti- 6Al-7Nb surface treated bysanding acid etch(SLA) on rat osteoblasts. Methods Experiments were divided into four groups, Ti mechanical grindinggroup(S1 group), Ti sand-blasting acid group(SLA1 group), Ti-6Al-7Nb mechanical grinding group(S2 group) and Ti-6Al-7Nb sand-blasting acid group(SLA2 group). The surface topography of samples was examined by microscope. The contactangle measurement instrument was used to analyse surface hydroph...