Abstract
Titanium and its alloys represent the gold standard for orthopaedic and dental prosthetic devices, because of their good mechanical properties and biocompatibility. Recent research has been focused on surface treatments designed to promote their rapid osteointegration also in case of poor bone quality. A new surface treatment has been investigated in this research work, in order to improve tissue integration of titanium based implants. The surface treatment is able to induce a bioactive behaviour, without the introduction of a coating, and preserving mechanical properties of Ti6Al4V substrates (fatigue resistance). The application of the proposed technique results in a complex surface topography, characterized by the combination of a micro-roughness and a nanotexture, which can be coupled with the conventional macro-roughness induced by blasting. Modified metallic surfaces are rich in hydroxyls groups: this feature is extremely important for inorganic bioactivity (in vitro and in vivo apatite precipitation) and also for further functionalization procedures (grafting of biomolecules). Modified Ti6Al4V induced hydroxyapatite precipitation after 15 days soaking in simulated body fluid (SBF). The process was optimised in order to not induce cracks or damages on the surface. The surface oxide layer presents high scratch resistance.
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Acknowledgments
Regione Piemonte is acknowledged for its funding to the BIOSURF project. Dr. Chiara Manfredotti is acknowledged for AFM measurements kindly performed. Filmetrics (San Diego, CA, USA) is acknowledged for measurements by means of spectral reflectance technique.
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Ferraris, S., Spriano, S., Pan, G. et al. Surface modification of Ti–6Al–4V alloy for biomineralization and specific biological response: Part I, inorganic modification. J Mater Sci: Mater Med 22, 533–545 (2011). https://doi.org/10.1007/s10856-011-4246-2
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DOI: https://doi.org/10.1007/s10856-011-4246-2