Cobalt-chromium alloys are now commonly used for fixed dentures and single crowns. The alloys are attractive because they are light and provide high stiffness due to their high elastic modulus (Young’s modulus) compared with noble metal alloys, pure titanium or titanium alloys.

Whether single crowns produced by computer-aided design and computer-aided manufacturing (CAD-CAM) have an internal fit comparable to crowns made by lost-wax metal casting technique is unknown.