Comparison of the Marginal Fit of Cobalt-Chromium Metal-Ceramic Crowns Fabricated by CAD/CAM Techniques and Conventional Methods at Three Production Stages.
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.
Francisco
F
Real-Voltas
Elisabeth
E
Romano-Cardozo
Oscar
O
Figueras-Alvarez
Magi
M
Brufau-de Barbera
Josep
J
Cabratosa-Termes
D002857:Chromium; D003035:Cobalt; D017076:Computer-Aided Design; D003442:Crowns; D003735:Dental Casting Technique; D018772:Dental Marginal Adaptation; D017267:Dental Prosthesis Design; D006801:Humans; D066298:In Vitro Techniques; D016876:Metal Ceramic Alloys
D016876:Metal Ceramic Alloys; D002857:Chromium; D003035:Cobalt