Crowns are dental restorations otherwise known as "caps", which are custom cast coverings that fit over teeth. Crowns may be necessary because of broken down old fillings, fractured, chipped or sensitive teeth. Crowns can also be used to improve the appearance of natural teeth that are malformed, malpositioned, or discolored.
Crowns can be made either of gold, porcelain with a metal base for added strength, or completely of porcelain for the most beautiful, natural look. Ask which material is right for your situation.