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Surface morphology of NiTi alloy in the initial state: ground surface (a,b,b’), polished surface (c,d,d’), and with TiO2 surface layers produced at 290 °C on ground surface (e,f,f’), at 290 °C on polished surface (g,h,h’), at 190 °C on ground surface (i,j,j’), and at 390 °C on ground surface (k,l,l’), both before (a,c,e,g,i,k) and after (b,b’,d,d’,f,f’,h,h’,j,j’,l,l’) 14-day incubation in SBF solution: SEM images magnified ×100 (a–l), ×500 (b’,d’,f’,h’,j’,l’).
