Ponente
Descripción
Titanium (Ti) and its alloys are the material of choice for long-term implant application mainly due to their good biocompatibility, high corrosion resistance and light weight. In order to stabilising bone-prosthesis interface, bioactive coatings are frequently applied; in this scenario, multi-element substituted hydroxyapatites are receiving attention due to the possibility of induce a specific biological response. Thus, the aim of this work was to obtain Sr-hydroxyapatite coatings onto titanium substrates through an accelerate biomimetic method.
Ti CP-2 was mechanical and chemical treated in alkaline solution. After that, a group of samples were subjected to a pre-calcification process prior to deposition. Once treated, substrates were immersed in a supersaturated calcium solution (SCS) during 4h. Phase composition was study by X-ray Diffraction and morphological characterization was assessed by Scanning Electron Microscopy. Roughness and topography were obtained by 3D optical profilometry while wettability was determined with a Drop and Surface Analyzer.
Results showed that, before deposition, NaOH pre-treated samples and pre-calcified surfaces display a similar structure of coral-like crystals composed by sodium-titanate and calcium-titanate respectively. After soaking in SCS, the morphology changes and some amorphous agglomerates of calcium phosphates can be seen; however, they do not cover the entire surface. When heating, the deposits densify and the presence of the elements Ca, P, O and Sr is detected; additionally, it is possible to observe another microstructure, probably due to the diffusion of Ti towards the surface. The roughness and topography before and after deposition are within the parameters accepted by international standards.
