The Journal of Advanced Prosthodontics

The Korean Academy of Prosthodonitics (대한치과보철학회)
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Accuracy evaluation of metal copings fabricated by computer-aided milling and direct metal laser sintering systems

  • Park, Jong-Kyoung (Department of Dental Laboratory Science and Engineering, College of Health Science, Korea University) ;
  • Lee, Wan-Sun (Department of Dental Laboratory Science and Engineering, College of Health Science, Korea University) ;
  • Kim, Hae-Young (Department of Public Health Science, Graduate School & BK21+ Program in Public Health Science, Korea University) ;
  • Kim, Woong-Chul (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)
  • Received : 2014.06.30
  • Accepted : 2014.10.01
  • Published : 2015.04.30
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Abstract

PURPOSE. To assess the marginal and internal gaps of the copings fabricated by computer-aided milling and direct metal laser sintering (DMLS) systems in comparison to casting method. MATERIALS AND METHODS. Ten metal copings were fabricated by casting, computer-aided milling, and DMLS. Seven mesiodistal and labiolingual positions were then measured, and each of these were divided into the categories; marginal gap (MG), cervical gap (CG), axial wall at internal gap (AG), and incisal edge at internal gap (IG). Evaluation was performed by a silicone replica technique. A digital microscope was used for measurement of silicone layer. Statistical analyses included one-way and repeated measure ANOVA to test the difference between the fabrication methods and categories of measured points (${\alpha}$=.05), respectively. RESULTS. The mean gap differed significantly with fabrication methods (P<.001). Casting produced the narrowest gap in each of the four measured positions, whereas CG, AG, and IG proved narrower in computer-aided milling than in DMLS. Thus, with the exception of MG, all positions exhibited a significant difference between computer-aided milling and DMLS (P<.05). CONCLUSION. Although the gap was found to vary with fabrication methods, the marginal and internal gaps of the copings fabricated by computer-aided milling and DMLS fell within the range of clinical acceptance (< $120{\mu}m$). However, the statistically significant difference to conventional casting indicates that the gaps in computer-aided milling and DMLS fabricated restorations still need to be further reduced.

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