Dental crowns are tooth shaped caps which is placed on the tooth to restore the shape size and appearance of the truth. These crowns also enhance the strength of the tooth. If the major portion of the truth is missing a crown is advised to enhance the strength of the tooth. By giving dental crowns that it can function normally. There are different types of crowns like metal crowns, ceramic crowns, porcelain fused to metal crowns and zirconia crowns. These dental crowns and bridges are advised if there is a missing single or multiple teeth in the oral cavity and some teeth are present adjacent to the missing area. These crowns are fixed permanently on to the adjacent teeth by cementation. These crowns are available in metal, porcelain fused to metal, ceramic and zirconia materials