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Comparison of the Marginal Fit of Cobalt-Chromium Metal-Ceramic Crowns Fabricated by CAD/CAM Techniques and Conventional Methods at Three Production Stages

2017; Quintessence Publishing Company; Volume: 30; Issue: 3 Linguagem: Inglês

10.11607/ijp.5038

1942-4426

Francisco Real‐Voltas, Elisabeth Romano-Cardozo, Óscar Figueras-Álvarez, M Barbera, Josep Cabratosa‐Termes,

Dental Implant Techniques and Outcomes

The aim of this study was to compare the marginal fit of cobalt-chromium crowns fabricated using conventional casts and computer-aided design/computer-assisted manufacturing (CAD/CAM) techniques at three stages of production: metal coping, after porcelain firing, and after cementation.A total of 80 metal-ceramic crowns were fabricated using four different techniques: lost wax casting, milling, laser sintering, and milling of a presintered metal block. Marginal fit was measured at each manufacturing stage.The porcelain firing stage improved marginal fit. CAD/CAM techniques resulted in better marginal fit than did conventional casting techniques at all manufacturing stages.CAD/CAM techniques improve marginal fit.