1, powder coating porcelain baking: porcelain powder and distilled water blended into a uniform powder slurry, coated in refractory substitutes, forming the appropriate shape of the crown, high-temperature grilling into a full porcelain crown. As a result of the direct baking technology on the refractory substitute instead of the previous platinum foil baking technology, the degree of microcrystallization, transparency and strength have been improved. 2, casting ceramics: is the use of lost wax casting process to glass state molding, after heat treatment to produce crystallization and porcelain, so also known as glass ceramics. Because of the lost wax method of casting molding, and then microcrystallization treatment, the need for special coloring, the process is more complex. 3, hot pressure casting ceramics: the use of special equipment and heating casting technology, the tooth-colored porcelain block melting plus pressure casting into the restoration. Typical products for IPS Empress, is a new type of non-shrinkage hot die-casting into the type of glass ceramic hot die-casting process can be applied in the production of structural ceramics, its application should be combined with the characteristics of structural ceramics have been improved, so that its process better meet the production of structural ceramics, Empress ceramic containing nucleating agent, after die-casting and melting and firing, you can complete the microcrystallization, thus easy to operate, and its shrinkage can be controlled by the thermal expansion of the embedding material, so its edge suitability is better. 4, infiltration ceramics: representative product is In-Ceram, its basic principle is in the refractory generation type with alumina powder slurry coating to form a nuclear crown prototype. In-Ceram ceramic material is used as a restoration base crown or stent because of the advantages of high strength and low shrinkage. 5, Procera allceram technology: the representative product is Procera allceram system. procera allceram technology is invented by Anderson dry sintered high purity aluminum porcelain core crown. procera allceram uses industrial technology to press the fine alumina powder at very high pressure on the mechanism generation type to form the billet. This forming technique is called dry pressurized forming. The high pressure gives the material a high packing density (dense), significantly reduces porosity, reduces sintering time and slows down grain growth, which is the main factor responsible for the excellent mechanical properties of Procera Allceram’s base crown material. The morphology of the inner surface of the base crown blanks has been determined by the surrogate shape, while the outer surface is ground by Procera CAM. The pre-sintered blanks have excellent machinability, which facilitates fast and precise contouring. This technology combines industrial technology and dental requirements through computer-aided design/computer aided manufacture (computer aided design/computer aided manufacture, CAD/CAM), which is a more prominent all-ceramic restorative material in terms of mechanics, biocompatibility, chemical stability, etc. 6, other CAD/CAM system: Cerec system, ClCERO system is the use of CAD/CAM technology to produce all-ceramic crown system.