Qiu Jing, Yu Wei-Qiang, Zhang Fu-Qiang, Smales Roger J, Zhang Yi-Lin, Lu Chun-Hui
Department of Prosthodontics, Ninth People's Hospital, School of Medicine, Shanghai JiaoTong University, Shanghai, China.
Eur J Oral Sci. 2011 Feb;119(1):93-101. doi: 10.1111/j.1600-0722.2011.00791.x.
This study evaluated the corrosion behaviour and surface properties of a commercial cobalt-chromium (Co-Cr) alloy and two nickel-chromium (Ni-Cr) alloys [beryllium (Be)-free and Be-containing] before and after a simulated porcelain-firing process. Before porcelain firing, the microstructure, surface composition and hardness, electrochemical corrosion properties, and metal-ion release of as-cast alloy specimens were examined. After firing, similar alloy specimens were examined for the same properties. In both as-cast and fired conditions, the Co-Cr alloy (Wirobond C) showed significantly more resistance to corrosion than the two Ni-Cr alloys. After firing, the corrosion rate of the Be-free Ni-Cr alloy (Stellite N9) increased significantly, which corresponded to a reduction in the levels of Cr, molybdenum (Mo), and Ni in the surface oxides and to a reduction in the thickness of the surface oxide film. The corrosion properties of the Co-Cr alloy and the Be-containing Ni-Cr alloy (ChangPing) were not significantly affected by the firing process. Porcelain firing also changed the microstructure and microhardness values of the alloys, and there were increases in the release of Co and Ni ions, especially for Ni from the Be-free Ni-Cr alloy. Thus, the corrosion rate of the Be-free Ni-Cr alloy increased significantly after porcelain firing, whereas the firing process had little effect on the corrosion susceptibility of the Co-Cr alloy and the Be-containing Ni-Cr alloy.
本研究评估了一种商用钴铬（Co-Cr）合金和两种镍铬（Ni-Cr）合金[无铍（Be）和含铍]在模拟烤瓷工艺前后的腐蚀行为和表面性能。在烤瓷之前，检测了铸态合金试样的微观结构、表面成分与硬度、电化学腐蚀性能以及金属离子释放情况。烤瓷之后，对类似的合金试样进行了相同性能的检测。在铸态和烤瓷状态下，Co-Cr合金（Wirobond C）均表现出比两种Ni-Cr合金更强的抗腐蚀能力。烤瓷之后，无铍Ni-Cr合金（Stellite N9）的腐蚀速率显著增加，这与表面氧化物中铬（Cr）、钼（Mo）和镍（Ni）含量的降低以及表面氧化膜厚度的减小相对应。Co-Cr合金和含铍Ni-Cr合金（昌平）的腐蚀性能未受到烤瓷工艺的显著影响。烤瓷工艺还改变了合金的微观结构和显微硬度值，并且钴和镍离子的释放量有所增加，尤其是无铍Ni-Cr合金中的镍。因此，无铍Ni-Cr合金在烤瓷后腐蚀速率显著增加，而烤瓷工艺对Co-Cr合金和含铍Ni-Cr合金的腐蚀敏感性影响较小。
