Schiff Nicolas, Grosgogeat Brigitte, Lissac Michele, Dalard Francis
School of dentistry, University Claude Bernard of Lyon 1, France.
Biomaterials. 2002 May;23(9):1995-2002. doi: 10.1016/s0142-9612(01)00328-3.
In the last decade, new titanium alloys have been developed in different areas of dentistry, such as TiAl6V4 and NiTi. Concurrently, treatments using fluoride supplementation, such as odontology fluoride containing gels, have also been widely used in odontology. The aim of this study was to compare the NiTi, NiTiCo and TiAl6V4 alloys with the titanium, regarding the corrosion resistance in Fusayama Meyer artificial saliva with different pH and fluoride contents. In the experimental methods, the corrosion potential was measured over time, then a linear sweep voltametric analysis measured the polarization resistances and corrosion currents. Our results have shown that TiAl6V4 alloys have a good corrosion resistance as good as that of titanium in Fusayama Meyer saliva and acid salivary solution, except NiTi and NiTiCo alloys. Conversely, we noticed, as for the titanium, a remarkable localized corrosion phenomenon of those new alloys in fluoride and acid-fluoride salivary solutions. The fluoride ions could cause the breakdown of the protective passivation layer that normally exists on the titanium and its alloys, leading to pit corrosion.
在过去十年中，牙科不同领域已研发出新型钛合金，如TiAl6V4和镍钛合金。同时，使用氟补充剂的治疗方法，如含氟牙科学凝胶，也在牙科学中得到广泛应用。本研究的目的是在不同pH值和氟含量的舟桥迈耶人工唾液中，比较镍钛合金、镍钛钴合金和TiAl6V4合金与钛的耐腐蚀性。在实验方法中，随时间测量腐蚀电位，然后通过线性扫描伏安分析测量极化电阻和腐蚀电流。我们的结果表明，在舟桥迈耶唾液和酸性唾液溶液中，TiAl6V4合金具有与钛相当的良好耐腐蚀性，镍钛合金和镍钛钴合金除外。相反，我们注意到，对于钛而言，这些新型合金在氟化物和酸性氟化物唾液溶液中会出现明显的局部腐蚀现象。氟离子可能导致钛及其合金表面通常存在的保护性钝化膜破裂，从而引发点蚀。
