Objective To study the changes in surface morphology of cobalt-chromium alloy, pure titanium and high-cobalt chromium molybdenum alloy immersed in artificial saliva with different concentrations of fluoride, and to analyze the corrosion resistance of these metals. Methods The three kinds of metal were polished and then were immersed in artificial saliva with different concentrations of fluoride (0%, 0.05%, 0.2%). All specimens were immersed for 3 weeks at (37.0±1.0)℃. Metal surface roughness before and after immersion were measured and analyzed by scanning electron microscope (SEM). Results Metal surface roughness was increased with the concentration of fluoride. The surface roughness of the Co-Cr group and Ti group had a statistically significant difference between before and after immersion at the fluoride concentration of 0.05% (P＜0.01), and the difference between Co-Cr group and vitallium2000 group, Ti group and vitallium2000 group were statistically significant difference (P＜0.01). The differences of three groups before and after immersion were statistically significant at the fluoride concentration of 0.2%(P＜0.01), and the difference among three groups was statistically significant (P＜0.01). Conclusion Patients who frequently use fluoride products should not use pure titanium or cobalt-chromium alloy prosthesis. Patients with these three metal prostheses are not advised to use high concentration fluoride products.%目的 研究钴铬合金、纯钛及高钴铬钼合金浸泡于不同氟浓度人工唾液发生腐蚀后表面形貌的改变,分析金属的耐腐蚀性.方法 将3种金属试件打磨后浸泡于不同氟浓度(0％、0.05％、0.2％)人工唾液中,(37.0±1.0)℃浸泡3周,测量浸泡前后表面粗糙度并观察表面形貌.结果 浸泡后金属表面粗糙度随氟浓度升高而增加.在含氟0.05％人工唾液中浸泡后,钴铬合金和纯钛的表面粗糙度与其浸泡前相比差异有统计学意义(P＜0.01)；钴铬合金、纯钛与高钴铬钼合金相比差异有统计学意义(P＜0.01)；在含氟0.2％人工唾液中浸泡后,3种金属的表面粗糙度较浸泡前差异均有统计学意义(P＜0.01),3种金属间相比较差异均有统计学意义(P＜0.01).结论 常使用含氟制品的患者不宜选用纯钛及钴铬合金修复体.口内有这3种金属的患者,不宜长时间使用高氟制品.
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