All-ceramic teeth, also known as all-ceramic crowns, are porcelain restorations that cover the entire surface of the crown and do not contain a metal inner crown. Because the inner crown no longer uses metal, but is made of high-strength porcelain material similar to the color of the tooth, so it is more beautiful than the metal base porcelain restorations, semi-transparent and similar to natural teeth, after the restoration of the gum edge performance more natural, can achieve the simulation effect, and has no stimulation of the surrounding tissue and other advantages, has been widely used in clinical, especially in the anterior teeth aesthetic restoration is often chosen. In recent years, the aesthetic requirements of patients for restorative effects are getting higher and higher. In order to make the color, shape and edge of the restored crown as close to natural teeth as possible, all-ceramic materials have been widely used in clinical practice. The aesthetic effect and long-term efficacy of all-ceramic teeth have been confirmed by clinical application. However, all-ceramic restorations require more dental preparation of the abutment teeth, which will have some stimulation to the pulp, especially to the pulp cavity of the large young permanent teeth damage, sometimes need to first root canal treatment before restoration. Patients want to make restorations with as little pulp as possible. Therefore, the clinical selection of restorative solutions should give priority to porcelain veneers and other preservation treatments. If all-ceramic restorations are chosen, single-crown restorations should be used as much as possible to facilitate post-restoration cleaning. In addition, in some cases, the use of all-ceramic restorations alone can not obtain the best aesthetic results, often need to be combined with other treatments, such as: and gum, periodontal surgery, orthodontics and other joint restorations. According to the different materials used in the production of all-ceramic teeth can be divided into 1, glass-ceramic all-ceramic teeth. Such as: hot die-casting porcelain crowns (Empress I, II, III generation), glass infiltration porcelain crowns, and the use of CAD/CAM technology to complete the glass-ceramic crowns. 2, alumina, zirconia all-ceramic teeth, through the application of CAD/CAM technology to complete the grinding of alumina, zirconia inner crown, and then through the layered porcelain stacking technology to add the outer layer of decorative porcelain, the production of completed all-ceramic teeth or no outer layer of decorative porcelain all-zirconia crown. The indications for restoration include: 1, restoration of discolored teeth (including restoration of moderate and severe tetracycline teeth and dead pulp discolored teeth); 2, restoration of dental defects; 3, restoration of enamel hypoplasia; 4, restoration of tooth defects; 5, restoration of contact points or occlusal relationship; 6, restoration of abnormal teeth and misaligned teeth; 7, closing the gap; 8, implant restoration, etc.