Crowns are used to restore teeth with extensive decay, fractured teeth, or teeth that have had a root canal. Most crowns completed in Dr. Martin’s, especially those in the front of the mouth, are porcelain. Modern porcelain materials, such as zirconia have proven to be as durable as metal or porcelain fused to metal. Crowns help protect and support natural tooth structure, while also providing excellent esthetics. They mimic the shape and color of your natural teeth.