Crowns can be described as a “shell/cap” that covers the entire tooth. The tooth is prepped (reduced) and an impression is made of the prepared tooth. While the porcelain crown is being fabricated, a temporary crown is made and cemented in place. Once the crown has been fabricated (usually in about 2 weeks), the temporary crown is removed and the permanent crown is cemented in its place. Crowns are indicated when decay in a tooth is so extensive that the restoration is larger than the remaining tooth structure, the tooth is cracked, or the tooth has undergone root canal treatment. Other indications for crowns include fractured teeth, teeth with large fillings, aesthetics or a number of functional reasons.