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

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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.