Biomimetic Preparation And Modulation Of Apatite Coatings On Titanium

Due to the superior combination of mechanical said biological performances, titanium and its alloys are been increasingly used inorthopaedics. Calcium phosphate coatings on titanium implants have been proved to accelerate bone healing and early implant fixation. Better bioactivity has been widely expected for apatite coatings biomimetically prepared on titanium. In the present work, sodium polyacrylate and sodium citrate were introduced in the light of biomineralization into the biomimetic preparation of apatite coalings to investigate their modulations on the growth of apatite. With the introduction of sodium polyacrylate, the apatite crystals transformed from flakes about 4 micrometers long and submicrometers thick to spherulites submicrometers in diameter. The sizes of sphelulites decreased with increasing polyacrylate concentration. It was also observed sequentially that, the crystal flake size decreased, the regular crystal geometry was destroyed, the rod-like crystal trabeculars aggregated to form a porous, woven morphology, with the citrate concentration increasing. In all cases, the introduction of organic species enhanced the density while decreased the maturity of the coatings with the organic content keeping low. Bioactivation of medical titanium through alkaline mixture solution with quick boimimetic deposition of apatite coatings was also explored and the mechanism was. suggested.Based on the present work, it is expected that further investigations shall be to prepare biomimetic apatite coatings with superior celluar and tissue reactions, in a simple and feasible manner.