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http://dx.doi.org/10.4047/jap.2020.12.3.124

Evaluation of marginal discrepancy in metal frameworks fabricated by sintering-based computer-aided manufacturing methods  

Kaleli, Necati (Department of Dentistry Services, Vocational School of Health Services, Ondokuz Mayis University)
Ural, Cagri (Department of Prosthodontics, Faculty of Dentistry, Ondokuz Mayis University)
Us, Yesim Olcer (Department of Prosthodontics, School of Dental Medicine, Bahcesehir University)
Publication Information
The Journal of Advanced Prosthodontics / v.12, no.3, 2020 , pp. 124-130 More about this Journal
Abstract
PURPOSE. The aim of this in vitro study was to evaluate the effect of sintering procedures on marginal discrepancies of fixed partial metal frameworks fabricated using different sintering-based computer-aided design and computer/aided manufacturing (CAD/CAM) techniques. MATERIALS AND METHODS. Forty resin die models of prepared premolar and molar abutment teeth were fabricated using a three-dimensional (3D) printer and divided into four groups (n = 10) according to the fabrication method of metal frameworks used: HM (via hard milling), SM (via soft metal milling), L25 (via direct metal laser melting [DMLM] with a 25 ㎛ layer thickness), and L50 (via direct DMLM with a 50 ㎛ layer thickness). After the metal frameworks were fabricated and cemented, five vertical marginal discrepancy measurements were recorded in each site (i.e., buccal, facing the pontic, lingual, and facing away from the pontic) of both abutment teeth under a stereomicroscope (×40). Data were statistically analyzed at a significance level of 0.05. RESULTS. No statistically significant differences (P>.05) were found among the four axial sites of metal frameworks fabricated by sintering-based CAD/CAM techniques. The HM and L25 groups showed significantly (P<.001) lower marginal discrepancy values than the SM and L50 groups. CONCLUSION. Marginal discrepancy in the sites facing the pontic was not influenced by the type of sintering procedure. All fabrication methods exhibited clinically acceptable results in terms of marginal discrepancies.
Keywords
Laser sintering; Metal framework; Marginal discrepancy; Soft metal milling;
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