At present, the most used porcelain restoration is the metal porcelain crown restoration. In other words, the metal crown is made of alloy (gold alloy has the best performance), and then covered with porcelain powder similar to the color of natural teeth, and then sintered in the porcelain furnace. The porcelain teeth made both metal strength, but also reflect the characteristics of porcelain. The appearance is realistic, beautiful and wear-resistant. Porcelain restoration is mainly applicable to the following cases; Gao Weinuo, Department of Stomatology, Xiyuan Hospital, Chinese Academy of Traditional Chinese Medicine, part of the crown is damaged due to caries or trauma, etc., and cannot be treated by the method of ordinary filling. Various kinds of discolored teeth. Such as tetracycline teeth, fluorosis teeth, dead pulp discolored teeth, etc. Misshapen teeth, misaligned and twisted front teeth, but cannot be treated by orthodontic treatment. Or due to occupational needs, need to improve the shape of the crown. Porcelain restoration can be used for single tooth restoration, but also can be used for fixed restoration and activity restoration when one or several teeth are missing. After the restoration of porcelain crowns, shape, color are very close to the real teeth, wear-resistant, non-discoloration, no foreign body feeling, or comfortable to use. But in the use of attention not to bite too hard food, so as not to cause the porcelain itself due to the brittleness of the porcelain crown breakage. Furthermore, the growing adolescents should choose porcelain restorations carefully, according to the development of the crown and root, combined with the doctor’s clinical examination to decide. In addition, the bite between the upper and lower teeth is too tight patients are not very suitable for porcelain restorations.