Huang Her-Hsiung
Institute of Oral Materials Science, Chun Shan Medical University, Taichung 402, Taiwan.
Angle Orthod. 2005 Jul;75(4):661-5. doi: 10.1043/0003-3219(2005)75[661:VICRON]2.0.CO;2.
Nickel-titanium (NiTi) wires produced by various manufacturers may have different corrosion resistance in acidic oral environments. The purpose of this study was to investigate the variation during in vitro corrosion resistance of commercial NiTi dental orthodontic wires from different manufacturers using the fast electrochemical technique. The linear polarization test was used to evaluate the corrosion resistance, in terms of polarization resistance (Rp), of as-received commercial NiTi wires in acidic artificial saliva at 37 degrees C. One-way analysis of variance was used to analyze Rp with the wire manufacturer as the variable factor. Atomic force microscopy was used to analyze the three-dimensional surface topography and roughness (Ra). Electron spectroscopy for chemical analysis was used to identify the chemical structure of the passive film on the NiTi wires. The results showed that NiTi wires from different manufacturers had a statistically significant difference in Rp (P < .001). Different surface topography was present among the tested NiTi wires, whereas the same surface chemical structure was observed for the tested NiTi wires. The surface roughness of the commercial NiTi wires with similar surface chemical structure does not correspond with the difference in corrosion resistance.
不同制造商生产的镍钛（NiTi）丝在酸性口腔环境中可能具有不同的耐腐蚀性。本研究的目的是使用快速电化学技术研究不同制造商的商用NiTi正畸丝在体外耐腐蚀性方面的差异。采用线性极化试验来评估在37℃酸性人工唾液中收到的商用NiTi丝的耐腐蚀性，以极化电阻（Rp）表示。以丝的制造商为可变因素，采用单因素方差分析来分析Rp。使用原子力显微镜分析三维表面形貌和粗糙度（Ra）。使用化学分析电子能谱来鉴定NiTi丝上钝化膜的化学结构。结果表明，不同制造商的NiTi丝在Rp方面存在统计学上的显著差异（P <.001）。测试的NiTi丝之间存在不同的表面形貌，而测试的NiTi丝观察到相同的表面化学结构。具有相似表面化学结构的商用NiTi丝的表面粗糙度与耐腐蚀性差异不对应。
