Photo by borodai on Envato Elements Millions of people in the United States and around the world have dental crowns to replace a missing tooth or strengthen a weakened tooth. The dental crown is composed of a material applied to the part of the tooth that is above the gum line and that serves as protection and support for the tooth. Types of materials used in dental crowns. Four types of material are used for dental crowns: 1. Ceramic (porcelain)…