The base of the crown is made of a metal alloy that is completely covered with ceramic so that the metal part is not visible. The metals used to make metal-ceramic crowns are gold alloys, alloys of other metals (eg titanium ...) or alloys with a steel base (eg nickel or chromium). The main advantage of metal-ceramic crowns is that the metal in the substrate gives a distinct strength. Also, due to their strength and consistency, they are often used in covering the premolars and molars where strong masticatory forces are present.
