Layering of discolored substrates with high-value opaque composites for CAD-CAM monolithic ceramics.

Statement Of Problem: Severely discolored substrates have been shown to limit the use of computer-aided design and computer-aided manufacturing (CAD-CAM) ceramic blocks because they provide insufficient color masking.

Purpose: The purpose of the in vitro study was to evaluate the effect of a layer of high-value opaque composite resin over discolored substrates to determine its masking ability with CAD-CAM ceramics.

Material And Methods: Six ceramic groups (n=10) were tested.