Bioactive coatings deposited on titanium alloys

CLAUDIA GARCIA,; SILVIA CERE; ALICIA DURAN

JOURNAL OF NON-CRYSTALLINE SOLIDS

Elsevier

Año: 2006 vol. 352 p. 3488 - 3495

0022-3093

Biomedical prosthetic devices are replacements made with the aim to be used in the human body, in an effort to substitute the function provided by the original part.  Metals are used in the human body mainly for orthopaedics purposes and their degradation by wear and or corrosion must be negligible. However, metals present some problems such as the in situ degradation and the requirement of the external fixation. One of the ways of minimise corrosion products release from the implant to the surrounding tissue consists in applying a protective coating. This protective coating may be functionalised with a bioactive material, able to generate a natural bonding to the living tissue.  This work describes the development of a double layer coating obtained by the sol-gel technique containing bioactive glass, glass-ceramic and hydroxyapatite particles in hybrid methyl-triethoxisilane (MTES) and tetraethilorthosilicate (TEOS) acidic sol, applied by the dip coating method on titanium alloy (ASTM F 67). The electrochemical behavior of the coated samples was evaluated by potentiodynamic polarization curves and electrochemical impedance spectroscopy assays (EIS) using simulated body fluid (SBF) as electrolyte. In vitro bioactivity tests were performed by evaluating the samples surface after soaking the coated samples in SBF at 37°C for various periods of time.