Kim Mijoo, Kim Jaewon, Mai Hang-Nga, Kwon Tae-Yub, Choi Yong-Do, Lee Cheong-Hee, Lee Du-Hyeong
Department of Prosthodontics, School of Dentistry, Kyungpook National University, Daegu, Republic of Korea.
Department of Periodontics and Endodontics, State University of New York at Buffalo, Buffalo, NY, USA.
J Adv Prosthodont. 2019 Oct;11(5):280-285. doi: 10.4047/jap.2019.11.5.280. Epub 2019 Oct 30.
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.
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).
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 (=.782). There was no tendency between the amount of marginal discrepancy and the measurement point.
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.
本研究旨在检验使用预烧结钴铬合金通过铣削烧结法制作的固定义齿的临床适合性。
在连续12例需要种植体支持的固定义齿患者中，分别通过铣削烧结法和铸造法制作两枚单金属烤瓷冠。在铣削烧结法中，在计算机软件中设计修复体基底冠，然后通过铣削和烧结后处理将设计转换为非贵金属合金基底冠。在铸造法中，采用传统的手工制作工艺。使用三维扫描技术在口内评估修复体的绝对边缘差异。采用曼-惠特尼U检验进行统计学分析（α = 0.05）。
8例患者（66.7%）使用铣削烧结法制作的修复体边缘差异低于铸造法制作的修复体。统计学上，铣削烧结法制作的修复体的不贴合度与铸造法制作的修复体无显著差异（P = 0.782）。边缘差异量与测量点之间无趋势关系。
在临床应用中，使用预烧结合金通过铣削烧结法制作的修复体的整体边缘适合性与传统铸造法制作的修复体相当。
