Corrosion Science and Technology

The Corrosion Science Society of Korea (한국부식방식학회)
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Corrosion Characteristics of Ni-Cr and Co-Cr Alloy Used as a Dental Prosthesis and Its Adhesion to Porcelain

Ni-Cr과 Co-Cr 합금을 이용한 치과보철물의 부식 특성 및 도재 접합성

  • 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)
  • 김기정 (조선대학교 일반대학원, 첨단부품소재공학과) ;
  • 최병기 ((주)세아베스틸, 소형압연팀 정정파트) ;
  • 오두록 (조선대학교, 재료공학과) ;
  • 최병상 (조선대학교 일반대학원, 첨단부품소재공학과)
  • Received : 2016.05.02
  • Accepted : 2016.06.23
  • Published : 2016.06.30
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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.

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References

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