A Dental Crown is a type of dental restoration which completely covers or encircles a tooth or implant. Crowns are often needed when a large cavity threatens the ongoing health of a tooth. They are typically bonded to the tooth using a dental cement. Crowns can be made from different materials like porcelain or Gold. Crowns are often used to improve the strength or appearance of teeth. While inarguably beneficial to dental health, the most common method of crowning a tooth involves using an impression of the prepared tooth by a dentist to fabricate the crown outside of the mouth. The crown can then be inserted at a subsequent appointment Because of the expansion properties, the relatively similar material costs, and the aesthetic benefits.