Corrosion rate of sand blasted and acid etched Ti6A14V for dental implants

摘要

The aim of present research was to find an effective method to manufacture sand blasted and acid etched (SLA) Ti6A14V surfaces for dental implants, with an average surface roughness Ra of 1...2 urn and a proper surface topography, as the morphology of dental implant surface is of extreme importance in the process of implant osseointegration. Several disc samples were subjected to sand blasting with 250...300 μm SiO2 large grits followed by different procedures of acid etching using sulfuric acid and hydrochloric acid (single acid baths, dual acid bath), at room temperature and elevated temperature (60°). Corrosion rate and corrosion penetration rate were calculated from weight loss. The R_a roughness of samples was measured in each stage of the process. Scanning electron microscopy was performed in order to characterize the topography of the surfaces. We found that a proper SLA surface, with a roughness R_a of 2 μm, and a topography with micropits less than 10 μm, can be obtain by sand blasting the machined surface with large grits and then acid etching it using a mixture of (H2SO4+HC1) (1:1) at 60°C, for 24 hours.