Crowns, also known as caps, restore damaged teeth and mimic the shape, size, and color of the surrounding teeth. Crowns are indicated for cracked teeth and teeth with deep cavities; to protect teeth that have been filled by root-canal treatment; to provide extra support for bridges, and to cover poorly shaped or discolored teeth. Crowns may be made of metal, porcelain, or newer restorative materials like metal-free ceramics. They are custom-made and fitted for each patient in conformation with the size and length of the natural teeth. Crowns typically last five to eight years but can last much longer with proper oral hygiene.
The teeth to be crowned are prepared which involves reduction of the tooth size (usually under local anesthesia) followed by an impression or mould of the prepared tooth. This trimming of the tooth is required to create space for the crown to be fitted. The mould taken is then sent to a laboratory where skilled technicians will fabricate the crown.