Development of Titanium Surgery Implants for Improving Osseointegration Through Formation of a Titanium Nanotube Layer

摘要

Recently, titanium and titanium alloys with nanotube layers by anodizing process have gained greatinterests as surgical implant materials. In this paper, the electrochemical stability of TiO2 nanotubuelayers prepared by anodization of pure Ti in three solutions has been investigated in simulatedbiological environment by use of open-circuit potential (OCP), electrochemical impedancespectroscopy (EIS) and potentiodynamic polarization (PD) tests. The PD testing results indicate thatthe nanotubular Ti shows a slightly higher passivation current than the mechanically polished titaniumin Hank's solution, this is attributed to the large surface area created by the nanostructure. Moreover,the electrochemical stability of Ti nanotubes is enhanced, as judged by the more nobler open circuitpotential values compared to that of Ti. The dependence of the electrochemical stability of thenanotubular surface depended on the dimensions of the TiO2 nanotube which was controlled byoptimizing the anodization electrolyte composition. The results reveal that architecting the surface oftitanium on the nanoscale render the surface more biocompatible by creating large surface area andmore sustainable by providing more stabilized surface which is less vulnerable to corrosion. .