Journal of Technologic Dentistry (대한치과기공학회지)

Korean Academy of Dental Technology (대한치과기공학회)
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Comparison of the marginal and internal fit of cores fabricated by Ni-Cr alloy(non-beryllium) and Co-Cr alloy

베릴륨이 함유되지 않은 니켈-크롬 합금 코어와 코발트-크롬 합금 코어의 적합도 비교평가

  • Kim, Ki-Baek (Department of Health Science Specialized in Dental Lab. Science & Engineering, Graduate School, Korea University) ;
  • Kim, Jae-Hong (Department of Health Science Specialized in Dental Lab. Science & Engineering, Graduate School, Korea University) ;
  • Kim, Woong-Chul (Department of Health Science Specialized in Dental Lab. Science & Engineering, Graduate School, Korea University) ;
  • Kim, Ji-Hwan (Department of Health Science Specialized in Dental Lab. Science & Engineering, Graduate School, Korea University)
  • 김기백 (고려대학교 대학원 보건과학과 치의기공전공) ;
  • 김재홍 (고려대학교 대학원 보건과학과 치의기공전공) ;
  • 김웅철 (고려대학교 대학원 보건과학과 치의기공전공) ;
  • 김지환 (고려대학교 대학원 보건과학과 치의기공전공)
  • Received : 2012.09.03
  • Accepted : 2012.12.21
  • Published : 2012.12.30
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Abstract

Purpose: The aim of this study measured and compared the marginal and internal fit of metal cores with two base metal alloy (Ni-Cr alloy(non-beryllium), Co-Cr alloy). Methods: Maxillary right first molar abutment fabricated by titanium was prepared for this study. Impressions(10ea) were made from titanium model, and study models were poured with improved dental stone. Wax cores of twenty were prepared for burn-out and casting. Ten wax cores cast Ni-Cr alloy(non-Be), and finally ten cast Co-Cr alloy. Marginal and internal fit of cores was evaluated using silicone replica technique and digital microscope(x160). The data were statistically analyzed with the independent samples t-test (${\alpha}$ <.05). Results: Mean(standard deviation, SD) marginal and internal fit total size of Ni-Cr alloy(non-Be) group was $73.3(14.4){\mu}m$ and of Co-Cr alloy group $65.6(17.4){\mu}m$. The marginal and internal fit total size of Ni-Cr alloy group(non-Be) was statistically significantly greater than that of Co-Cr alloy group (P=.004). Conclusion: Co-Cr alloy cores in this study had a better marginal fit than Ni-Cr alloy(non-Be) cores.

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References

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