Ion beam sensitizing of titanium surfaces to hydroxyapatite formation
Ion beam sensitizing of titanium surfaces to hydroxyapatite formation
Pham, M. T.; Matz, W.; Reuther, H.; Richter, E.; Steiner, G.; Oswald, S.
Abstract
CaO and P2O5 containing Ti surfaces were prepared and examined for their bioactivity. The preparation involved the incorporation of Ca and P into Ti by ion implantation to a total dose of up to 8 x 1017 ions/cm² with a 1.7 Ca/P ratio and a subsequent oxidation at 500 °C in O2 for 40 min. The model surfaces were examined for their reactivity toward hydroxyapatite formation by microscopically recording the mineralization in a simulated body fluid. The ion implantation modified surfaces were shown to exhibit enhanced mineralization by inducing heterogeneous nucleation, growth, and proliferation of hydroxyapatite, relative to a control sample of pure Ti. The surface induced reactivity was shown to relate to the enhanced provision of the ionic mineral components Ca2+ and HPO42- directly supplied from the surface and the substrate-mediated nucleation by hydroxylated surface TiO2.
Keywords: biomaterials; ion implantation; surface coatings; Ti; hydroxyapatite
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Contribution to proceedings
Proceedings of the Eleventh International Conference on Surface Modification of Metals by Ion Beams (SMMIB'99), Sept. 19-14, 1999, Beijing, P.R. China. - Surface & Coatings Technology 128-129 (2000) 313-319
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