Barrabés Maite, Michiardi Alexandra, Aparicio Conrado, Sevilla Pablo, Planell Josep A, Gil Francisco Javier
CREB, Departamento de Ciencia de Materiales e Ingeniería Metalúrgica, ETSEIB, Universidad Politécnica de Cataluña, Diagonal 647, 08028 Barcelona, Spain,
J Mater Sci Mater Med. 2007 Nov;18(11):2123-9. doi: 10.1007/s10856-007-3012-y. Epub 2007 Jul 10.
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.
这项工作研究了使用一种新的氧化处理方法处理过的镍钛泡沫材料，目的是获得无镍表面，以使活组织能够向内生长，从而增强植入物的机械锚固力。这些材料实际表面积的显著增加会降低耐腐蚀性并有利于镍的释放。这种化学降解会在周围组织中引发过敏反应或毒性。本研究测定了经一种能产生无镍表面的新型表面氧化处理的泡沫材料的孔隙率、表面特性、相变、力学性能、腐蚀行为以及镍在模拟体液介质中的释放情况。这些泡沫材料具有大小合适且相互连通的孔隙，因此其形态与骨相似。它们的力学性能在生物力学上与骨相容。表面的氧化钛显著提高了耐腐蚀性并减少了镍离子的释放，同时对转变温度几乎没有影响。
