Porcelain dental applications in the history of more than a hundred years, from the initial precious metal porcelain teeth to later nickel-chromium, pure titanium porcelain teeth to the emergence of all-porcelain dental systems in recent years, people’s requirements for restorations can not be limited to functional recovery, but began to have an increasingly high pursuit of beauty, highly simulated all-porcelain restorations play an increasingly important role in aesthetic restoration! All-ceramic restorations, mainly divided into cast porcelain crowns, cast porcelain veneers, porcelain deposited full crowns and CAD/CAM full crowns. CAD/CAM crown is the use of computer-aided design and computer-aided production of oral restorations, the production of highly accurate. All-ceramic technology: abandoned the abandonment of the traditional metal-based crowns, replaced by ceramic materials to produce the base of the inner crown or completely without the inner crown of the hot die-casting ceramic technology. The advantages of all-ceramic restorations 1, the best biocompatible performance, the materials used are completely inert and non-decomposable, non-irritating, non-allergenic (so that people allergic to metal can also be fitted with a denture) (to the gums), the health of periodontal tissue after the denture restoration is also important. There is a strong periodontal support tissue denture can be used for a longer period of time. 2, the optical properties of the restoration are similar to the natural tooth roots, which can realistically reproduce the opalescent color and translucency of natural teeth, and its bionic properties cannot be compared to other restorative materials. 3. It is the best choice for patients who need MRI, because in MRI, if the mouth contains metal, artifacts will be formed in the vicinity, affecting the examination effect of the surrounding ear, nose and throat and ophthalmology. There are also disadvantages: the price is higher, marketing is more difficult, in addition, because it does not have metal brackets than metal porcelain teeth are slightly less resistant to fracture, clinical selection should grasp the indications. In the clinic we will see a lot of serious tetracycline teeth and fluorosis, the application of all-porcelain technology can not look beautiful teeth become beautiful! 1, the most used alumina base all-ceramic restorations; moderate price, wide indications, excellent fracture resistance, with good color shading properties, even if the black metal pile core can also achieve good aesthetic results. Mainly including Vita alumina crowns and Swedish alumina crowns, the latter differs in its better suitability through the Internet in Sweden with the help of computer-aided production of alumina inner crowns. 2. Cast porcelain restorations with the best optical aesthetic effect, including full crowns, veneers and inlays. Because there is no inner crown, the indications are narrower, previously only suitable for anterior teeth with little biting force, abutment teeth with sufficient thickness of the enamel layer of color anomalies or small areas of defective unattractive affected teeth. With the advancement of technology, cast porcelain III restorations have been able to produce 3 to 4 units of bridgework for premolar teeth. We are now using more than the Yi Yujia cast porcelain and E-MAX cast porcelain 3, strong and durable zirconia base restorations, has been able to produce up to six units of fixed bridges, zirconia fracture strength has been close to metal or even more than the fracture strength of metal, the emergence of this material allows all-ceramic restorations instead of metal base restorations become possible. However, this material also has a major disadvantage: the restoration is difficult to grind and remove after damage, especially the zirconia pile core. There are mainly Zekang and other brands, performance and price difference is a lot, choose carefully. 4, precise and beautiful CAD/CAM computer-aided production of all-ceramic restorations, due to the production of the inner crown using a cold cutting production process to overcome the traditional casting technology material shrinkage is difficult to precisely control the problem, to make the denture in the suitability of the abutment teeth to an unprecedented degree, good contact so that the restoration of the gingival irritation to a minimum! This technology makes chairside denture making a reality, and the CEREC chairside all-ceramic system has been clinically applied abroad. 5, economical and practical light polymerization porcelain (porcelain-like resin) crowns; there are many people who want beauty but do not have enough money, light polymerization porcelain is the best choice, cheap, good performance, but the fracture resistance and wear resistance is slightly poor, but when you have the money can also be replaced. Loose wind polymer porcelain is a good choice. All-ceramic technology in the role of aesthetic restoration speaks for itself, but each restoration has its own different indications, in the clinical application should be strictly grasp, want to emphasize a few points: 1, due to all-ceramic dental crown and bridge material performance requirements in the preparation of abutment teeth grinding the amount of tooth, too small and too short teeth are not recommended, all-ceramic materials only then have sufficient thickness to obtain the best performance, such as shoulder width not Less than 1mm, etc. 2, the impression is very important, must use silicone rubber to make pressure impressions. If there are conditions, polyether silicone rubber is recommended. 3, bonding must not be ignored, a bonding agent can not be bonded to all the restorations. Recommended: alumina-based layer of all-ceramic restorations using glass ionomer, resin-reinforced glass ionomer or composite resin; cast porcelain using resin-reinforced glass ionomer or composite resin; zirconia-based restorations can use any bonding material; veneers must use a composite resin bond.