The Journal of Advanced Prosthodontics

The Korean Academy of Prosthodonitics (대한치과보철학회)
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Evaluation of marginal and internal gaps of Ni-Cr and Co-Cr alloy copings manufactured by microstereolithography

  • Kim, Dong-Yeon (Department of Dental Laboratory Science and Engineering, College of Health Science, Korea University) ;
  • Kim, Chong-Myeong (Department of Dental Laboratory Science and Engineering, College of Health Science, Korea University) ;
  • Kim, Ji-Hwan (Department of Dental Laboratory Science and Engineering, College of Health Science, Korea University) ;
  • Kim, Hae-Young (Department of Dental Laboratory Science and Engineering, College of Health Science & Department of Public Health Sciences, Graduate School & BK21+ Program in Public Health Sciences, Korea University) ;
  • Kim, Woong-Chul (Department of Dental Laboratory Science and Engineering, College of Health Science, Korea University)
  • Received : 2016.08.12
  • Accepted : 2017.01.10
  • Published : 2017.06.30
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Abstract

PURPOSE. The purpose of this study was to evaluate the marginal and internal gaps of Ni-Cr and Co-Cr copings, fabricated using the dental ${\mu}-SLA$ system. MATERIALS AND METHODS. Ten study dies were made using a two-step silicone impression with a dental stone (type IV) from the master die of a tooth. Ni-Cr (NC group) and Co-Cr (CC group) alloy copings were designed using a dental scanner, CAD software, resin coping, and casting process. In addition, 10 Ni-Cr alloy copings were manufactured using the lost-wax technique (LW group). The marginal and internal gaps in the 3 groups were measured using a digital microscope ($160{\times}$) with the silicone replica technique, and the obtained data were analyzed using the non-parametric Kruskal-Wallis H test. Post-hoc comparisons were performed using Bonferroni-corrected Mann-Whitney U tests (${\alpha}=.05$). RESULTS. The mean (${\pm}$ standard deviation) values of the marginal, chamfer, axial wall, and occlusal gaps in the 3 groups were as follows: $81.5{\pm}73.8$, $98.1{\pm}76.1$, $87.1{\pm}44.8$, and $146.8{\pm}78.7{\mu}m$ in the LW group; $76.8{\pm}48.0$, $141.7{\pm}57.1$, $80.7{\pm}47.5$, and $194.69{\pm}63.8{\mu}m$ in the NC group; and $124.2{\pm}52.0$, $199.5{\pm}71.0$, $67.1{\pm}37.6$, and $244.5{\pm}58.9{\mu}m$ in the CC group. CONCLUSION. The marginal gap in the LW and NC groups were clinically acceptable. Further improvement is needed for CC group to be used clinical practice.

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References

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