Crowns and bridges are fixed prosthetic restorations the cover the entire tooth surface (crown) or replace missing teeth by utilizing adjacent teeth as crown anchors (retainers). A crown is indicated when a tooth loses a large part of its structure due to decay and fracture and the filling cannot be adequately retained. It is also indicated following root canal treatment to reduce the chances of future tooth fracture. A bridge is indicated as a fixed (non-removable) replacement of a missing tooth. The adjacent teeth (front and back of the missing tooth space) are used as retainers for the bridge structure. Crowns and bridges are made of porcelain, porcelain fused to metal or base/gold metal alloy, and permanently cemented in place. The dentist will advise you if such restoration type is recommended.