Most crowns and bridges are made of porcelain in combination with metal and / or gold.
A metal base which we call sub-structure is produced, and then a layer of tooth-colored porcelain is applied over the exposed metal.
The porcelain used for crowns and bridges, has improved greatly over time. The colors can be accurately determined and lifelike. This is partly due to the computer-controlled ovens with porcelain crowns fried.