The Journal of Advanced Prosthodontics

The Korean Academy of Prosthodonitics (대한치과보철학회)
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Comparative clinical study of the marginal discrepancy of fixed dental prosthesis fabricated by the milling-sintering method using a presintered alloy

  • Kim, Mijoo (Department of Prosthodontics, School of Dentistry, Kyungpook National University) ;
  • Kim, Jaewon (Department of Periodontics and Endodontics, State University of New York at Buffalo) ;
  • Mai, Hang-Nga (Institute for Translational Research in Dentistry, Kyungpook National University) ;
  • Kwon, Tae-Yub (Department of Dental Biomaterials, School of Dentistry, Kyungpook National University) ;
  • Choi, Yong-Do (Institute for Translational Research in Dentistry, Kyungpook National University) ;
  • Lee, Cheong-Hee (Department of Prosthodontics, School of Dentistry, Kyungpook National University) ;
  • Lee, Du-Hyeong (Department of Prosthodontics, School of Dentistry, Kyungpook National University)
  • Received : 2019.07.19
  • Accepted : 2019.10.29
  • Published : 2019.10.31
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Abstract

PURPOSE. The present study was designed to examine the clinical fit of fixed dental prosthesis fabricated by the milling-sintering method using a presintered cobalt-chromium alloy. MATERIALS AND METHODS. Two single metal-ceramic crowns were fabricated via milling-sintering method and casting method in each of the twelve consecutive patients who required an implant-supported fixed prosthesis. In the milling-sintering method, the prosthetic coping was designed in computer software, and the design was converted to a non-precious alloy coping using milling and post-sintering process. In the casting method, the conventional manual fabrication process was applied. The absolute marginal discrepancy of the prostheses was evaluated intraorally using the triple-scan technique. Statistical analysis was conducted using Mann-Whitney U test (${\alpha}=.05$). RESULTS. Eight patients (66.7%) showed a lower marginal discrepancy of the prostheses made using the milling-sintering method than that of the prosthesis made by the casting method. Statistically, the misfit of the prosthesis fabricated using the milling-sintering method was not significantly different from that fabricated using the casting method (P=.782). There was no tendency between the amount of marginal discrepancy and the measurement point. CONCLUSION. The overall marginal fit of prosthesis fabricated by milling-sintering using a presintered alloy was comparable to that of the prosthesis fabricated by the conventional casting method in clinical use.

Keywords

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