Comparative clinical study of the marginal discrepancy of fixed dental prosthesis fabricated by the milling-sintering method using a presintered alloy
김미주, 김재원, Mai Hang-Nga, 권태엽, Choi Yong-Do, 이청희, 이두형,
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김미주 ( Kim Mi-Joo ) - Kyungpook National University School of Dentistry Department of Prosthodontics
김재원 ( Kim Jae-Won ) - State University of New York at Buffalo Department of Periodontics and Endodontics
( Mai Hang-Nga ) - Kyungpook National University Institute for Translational Research in Dentistry
권태엽 ( Kwon Tae-Yub ) - Kyungpook National University School of Dentistry Department of Dental Biomaterials
( Choi Yong-Do ) - Kyungpook National University Institute for Translational Research in Dentistry
이청희 ( Lee Cheong-Hee ) - Kyungpook National University School of Dentistry Department of Prosthodontics
이두형 ( Lee Du-Hyeong ) - Kyungpook National University School of Dentistry Department of Prosthodontics
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 (α=.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.
키워드
Presintered; Alloy; Marginal discrepancy; Clinical; Fixed dental prosthesis; Dental
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