A Crown is a type of dental restoration which completely caps or encircles a tooth or dental implant . Crowns are often needed when a large cavity threatens the on-going health of a tooth, Crowns are often used to improve the strength or appearance of teeth, while inarguably beneficial to dental health. They are typically bonded to the tooth using a dental cement.
A bridge is a fixed dental restoration used to replace a missing tooth by joining an artificial tooth permanently to adjacent teeth or dental implants. A bridge is fabricated by reducing the teeth on either side of the missing tooth or teeth by a preparation pattern determined by the location of the teeth.