Abstract
Thin calcium phosphate coatings were deposited on NiTi substrates (plates) by rf-magnetron sputtering. The release of nickel upon immersion in water or in saline solution (0.9% NaCl in water) was measured by atomic absorption spectroscopy (AAS) for 42 days. The coating was analyzed before and after immersion by X-ray powder diffraction (XRD), scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDX). After an initial burst during the first 7 days that was observed for all samples, the rate of nickel release decreased 0.4–0.5 ng cm−2 d−1 for a 0.5 μm-thick calcium phosphate coating (deposited at 290 W). This was much less than the release from uncoated NiTi (3.4–4.4 ng cm−2 d−1). Notably, the nickel release rate was not significantly different in pure water and in aqueous saline solution.
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The authors thank Mr S. Boukercha, Mrs K. Brauner and Mrs V. Hiltenkamp for experimental assistance with the SEM experiments and with the nickel analyses.
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Surmenev, R.A., Ryabtseva, M.A., Shesterikov, E.V. et al. The release of nickel from nickel–titanium (NiTi) is strongly reduced by a sub-micrometer thin layer of calcium phosphate deposited by rf-magnetron sputtering. J Mater Sci: Mater Med 21, 1233–1239 (2010). https://doi.org/10.1007/s10856-010-3989-5
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DOI: https://doi.org/10.1007/s10856-010-3989-5