Dental bridges and crowns are fixed prosthetic devices used often to replace missing teeth by 'bridging' the gap between the missing teeth.
Bridges are most commonly used to cover a space caused by many reasons on one or several missing teeth. The bridge is cemented to a remaining natural tooth or implant that surrounds the space where a tooth once existing that now requires covering.
Crowns, in contrast to bridges, are commonly used to entirely cover a tooth that has been damaged or may also be used to cover an implant when needed. A crown makes the tooth look more aesthetically pleasing and can help protect it from further damage.