Abstract
This work examines NiTi foams that have been treated using a new oxidation treatment for obtaining Ni-free surfaces that could allow the ingrowth of living tissue, thereby increasing the mechanical anchorage of implants. A significant increase in the real surface area of these materials can decrease corrosion resistance and favour the release of Ni. This chemical degradation can induce allergic reactions or toxicity in the surrounding tissues. This study determines the porosity, surface characteristics, phase transformation, mechanical properties, corrosion behaviour and Ni release into the simulated body fluid medium of foams treated by a new surface oxidation treatment that produces Ni-free surfaces. These foams have pores in an appropriate range of sizes and interconnectivity, and thus their morphology is similar to that of bone. Their mechanical properties are biomechanically compatible with bone. The titanium oxide on the surface significantly improves corrosion resistance and decreases nickel ion release, while barely affecting transformation temperatures.
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The authors would like to thank Dr. Jose M. Manero for his help with scanning electron microscope imaging and sample preparation and CICYT (MAT2003-08165 and MAT2005-07244) for its financial support.
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Barrabés, M., Michiardi, A., Aparicio, C. et al. Oxidized nickel–titanium foams for bone reconstructions: chemical and mechanical characterization. J Mater Sci: Mater Med 18, 2123–2129 (2007). https://doi.org/10.1007/s10856-007-3012-y
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DOI: https://doi.org/10.1007/s10856-007-3012-y