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http://dx.doi.org/10.14773/cst.2016.15.3.141

Corrosion Characteristics of Ni-Cr and Co-Cr Alloy Used as a Dental Prosthesis and Its Adhesion to Porcelain  

Kim, Kijung (Department of Advanced Materials Engineering, Graduate School of Engineering, Chosun University)
Choi, Byungki (Compact Rolling Team, SeAH Besteel Corp.)
Oh, Doorok (Department of Materials Science and Engineering, Chosun University)
Choi, Byung-Sang (Department of Advanced Materials Engineering, Graduate School of Engineering, Chosun University)
Publication Information
Corrosion Science and Technology / v.15, no.3, 2016 , pp. 141-146 More about this Journal
Abstract
By using Ni-Cr and Co-Cr alloys, porcelain fused to metal (PFM) samples were prepared to examine the interface and the surface corrosion behavior. The potentiodynamic polarization analysis showed that the corrosion current density of Co-Cr alloy ($1.61{\times}10^{-6}A/cm^2$) was three times lower than that of Ni-Cr alloy ($4.83{\times}10^{-6}A/cm^2$) at room temperature. A dental prosthesis consisting of the porcelain fused to Ni-Cr alloy extracted from a patient after approximately four years of usage was examined to assess its resistance to corrosion. OM and SEM images of the metal part revealed a typical pitting corrosion. As compared to porcelain fused to Ni-Cr alloy having a thick layer (${\sim}10{\mu}m$) of oxide at the interface, a relatively thin oxide layer (less than $5{\mu}m$) was formed on Co-Cr alloy, indicating that the interface between Co-Cr alloy and porcelain may have a better adhesion strength than the interface between Ni-Cr alloy and porcelain.
Keywords
dental prosthesis; porcelain fused to metal (PFM); pitting corrosion; Ni-Cr; Co-Cr;
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