Dental restorations maybe internal or inlay, or external or onlay and these, in turn, may the partial or total. The crown is a total peripheral restoration. It is indicated for functional or esthetic requirements, and may be metallic, acrylic, metal with porcelain, only porcelain, or of compound materials. The preparation of the tooth to receive a crown varies according to the type of material that is used for its construction. The great challenge is to achieve peripheral sealing that prevents microbial colonization (an objective that is very difficult to achieve), which would cause further caries. Because of this, the useful life of crowns is usually limited (25)(33).