A crown (sometimes referred to as a cap) is a full coverage restoration that restores the anatomical surfaces of a damaged or fractured tooth to their original contour and function. The anatomical surfaces are the parts of the tooth that you can see above the gum line. Typically, this type of restoration is recommended when there is very little tooth structure left to restore or when there has been a root canal done on the tooth.
Every tooth in your mouth provides support, structure and function to the jaw. Absence of even a single tooth can cause the adjacent teeth to drift into the position of the missing tooth. A bridge is a dental prosthesis that is used to replace one or more missing teeth in the same arch and is permanently cemented into the mouth; therefore, you cannot remove it. This is normally recommended after an extract