Introduction Bioinspired structures for implant coating are a guarantee for good biocompatibility and osseointegration.In this approach the investigation is focused on the elaboration and characterization of hybrid coatings based on hydroxyapatite and natural polymeric components on different titanium alloy substrata.The titanium implant alloys have non alergenic and nontoxic elements components such as Zr and,Ta.A small amount of Ag as component in the elemental composition or as a doping element in the modified nanostructured surface is due to the need of improvement of the antibacterial activity of the implant in a time when bacteria are more and more aggressive.