Journal of Technologic Dentistry (대한치과기공학회지)

Korean Academy of Dental Technology (대한치과기공학회)
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Study on Shear Bond Strength of Ni-Cr Alloy for Porcelain Fused to Metal Crown at the Temperature of Degassing

치과 도재용착용 Ni-Cr 합금의 열처리에 따른 결합력 연구

  • 주규지 (광주보건대학교 치기공과) ;
  • 신재우 (광주보건대학교 치기공과) ;
  • 조홍규 (광주보건대학교 치기공과)
  • Received : 2016.02.26
  • Accepted : 2016.06.09
  • Published : 2016.06.30
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Abstract

Purpose: This study was to evaluate the shear bond strength of ceramic fused to Ni-Cr alloy(Alophaloy) by heat treatment. Methods: The specimens were divided into 5 groups according to heat treatment conditions prior to porcelain application. Eighteen specimens from each group were subjected to the shear load a universal testing machine using a 0.1mm/min cross-head speed and two specimens from each group were observed with SEM and EDX line profile. Results: The observation of the oxide film on the metal surface by SEM photograph showed a coarsening with an increasing degassing hold time. The diffusion of metal oxide was observed farther from the opaque layer in the heat treated specimen than no heat treated specimen. The shear bond strength measured highest to A5(55.23MPa) in the 10min holding group and measured lowest from A1(24.38MPa) in the no heat treated group, and there was a significant difference(p<0.05). Conclusion: The shear bond strength of Ni-Cr alloy improved in the heat treatment compared to the no heat treatment specimen.

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References

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