The properties of bioactive TiO2 coatings on Ti-based implants

We report a method for the one-step synthesis of a thin layer of anatase TiO2 on Ti6Al4V alloy for the improvement of short-term and long-term body responses. In particular, this method decreases the direct contact between bone tissue and metals, especially aluminium and vanadium, and improves bone osseointegration. The coating was prepared by hydrothermal synthesis in the presence of titanium ions. Morphology advantageous for bioactivity and photocatalytic properties were achieved by using the appropriate dopants and surface-active agents during the processing. The coating was composed of pinacoidal anatase grains and strongly attached to the substrate alloy; it improved hydrophilicity and reduced the leaching of toxic metal ions. The coating also stimulated the formation of hydroxyapatite when soaked in simulated body fluid solution, which was influenced by different anatase planes.

► We prepared anatase coatings on Ti-based implants by hydrothermal treatment with enhanced bioactivity.
► Morphology advantageous for bioactivity and photocatalytic properties were achieved.
► TiO2 coating turns hydrophobic Ti-alloy to hydrophilic.
► Leaching of metal ions from Ti-alloy is reduced by TiO2 coating.
► The coating is composed of pinacoidal anatase grains and strongly attached to the substrate alloy.