The Influence of Protein in Saliva on the Corrosion Evaluation of Dental Alloys

电化学特性可用于评价牙科合金的腐蚀性能。然而，合金试样的电化学特性易受表面处理条件和溶液成分的影响。本研究探讨了蛋白质对牙科合金耐腐蚀性的影响。采用三种不同的表面处理方法：镜面抛光、#600抛光和喷砂处理，对两种贵金属合金、一种钴铬合金和纯钛进行了研究。采用电化学测试系统测试了自然电极电位、极化电阻、自腐蚀电位和动电位极化行为，结果表明，不同抛光条件下的耐蚀性不同，相同合金试样中镜面抛光试样的耐蚀性最高，喷砂试样的耐蚀性最低。改变抛光条件，虽然腐蚀电位、临界电流密度和钝化电流密度发生变化，但过钝化电位不变。镜面抛光似乎是有效的牙科合金的耐腐蚀性的评价。0.01%蛋白质含量的显著效果在耐腐蚀性方面没有被任何合金认可。

Electro-chemical characteristics are useful for evaluating the corrosion properties of dental alloys. However, the electro-chemical characteristics of an alloy specimen is easily affected by surface finishing condition and component of solution. In this study, the influence of protein on the corrosion resistance of dental alloys was investigatedTwo precious alloys, a Co-Cr alloy and CP titanium were examined using three different surface preparations : mirror polishing, # 600 polishing, and air blasting. The natural electrode potential, polarization resistance, corrosion potential, and potentiodynaniic polarization behavior were examined using the Electro-chemical measurement system.Corrosion resistance was changed by the finishing condition, and the mirror polished specimens showed the highest corrosion resistance in the same alloy specimens and the air blasted specimens showed the lowest corrosion resistance in the same alloy specimens. Although corrosion potential, critical current density and passive current density was changed when the finishing conditions changed, the transpassive potential is not changed. Mirror polish seems to be effective in the evaluation of the corrosion resistance of dental alloys. The remarkable effect of 0.01% protein content was not recognized any alloys in term of corrosion resistance.