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Open AccessArticle

Marginal Accuracy and Internal Fit of 3-D Printing Laser-Sintered Co-Cr Alloy Copings

Department of Prosthodontics and Dental Research Institute, School of Dentistry, Seoul National University, 101 Daehak-Ro Jongno-Gu, Seoul 03080, Korea
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Author to whom correspondence should be addressed.
These authors contributed equally to this work.
Academic Editor: Franz E. Weber
Materials 2017, 10(1), 93; https://doi.org/10.3390/ma10010093
Received: 8 December 2016 / Revised: 17 January 2017 / Accepted: 18 January 2017 / Published: 23 January 2017
(This article belongs to the Section Manufacturing Processes and Systems)
Laser sintered technology has been introduced for clinical use and can be utilized more widely, accompanied by the digitalization of dentistry and the development of direct oral scanning devices. This study was performed with the aim of comparing the marginal accuracy and internal fit of Co-Cr alloy copings fabricated by casting, CAD/CAM (Computer-aided design/Computer-assisted manufacture) milled, and 3-D laser sintered techniques. A total of 36 Co-Cr alloy crown-copings were fabricated from an implant abutment. The marginal and internal fit were evaluated by measuring the weight of the silicone material, the vertical marginal discrepancy using a microscope, and the internal gap in the sectioned specimens. The data were statistically analyzed by One-way ANOVA (analysis of variance), a Scheffe’s test, and Pearson’s correlation at the significance level of p = 0.05, using statistics software. The silicone weight was significantly low in the casting group. The 3-D laser sintered group showed the highest vertical discrepancy, and marginal-, occlusal-, and average- internal gaps (p < 0.05). The CAD/CAM milled group revealed a significantly high axial internal gap. There are moderate correlations between the vertical marginal discrepancy and the internal gap variables (r = 0.654), except for the silicone weight. In this study, the 3-D laser sintered group achieved clinically acceptable marginal accuracy and internal fit. View Full-Text
Keywords: Co-Cr alloy; CAD/CAM milled; laser sintering; marginal accuracy; internal fit Co-Cr alloy; CAD/CAM milled; laser sintering; marginal accuracy; internal fit
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Kim, M.-J.; Choi, Y.-J.; Kim, S.-K.; Heo, S.-J.; Koak, J.-Y. Marginal Accuracy and Internal Fit of 3-D Printing Laser-Sintered Co-Cr Alloy Copings. Materials 2017, 10, 93.

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