A crown (“cap”) is a type of dental restoration that fully cups over that portion of a tooth or dental implant that lies at and above the gum line. Crowns are used to cover, protect and restore the shape of your teeth when fillings aren’t the solution to the problem. They can be made out of metals, resin, porcelain and ceramics. Typically they do not require any ongoing special care other than regular good oral hygiene.
Once placed, it in effect becomes the tooth’s new outer surface. This is in comparison to a dental filling which just fills in or repairs a portion of a tooth.
Crowns are permanently cemented into place. The tooth-crown unit, that is created, functions and is cared for just like a natural tooth. Crowns are usually needed if you have a damaged or weakened tooth that cannot be fixed with a filling.
In dental terms, the clinical crown of a tooth is that portion which is covered with tooth enamel and projects through the gums into the mouth (i.e., the part you can see, as compared to the root).