CEREC 3 CAD/CAM all-ceramic restorative system is an advanced restorative dentistry device produced by Sirona Dental Equipment GmbH. The all-ceramic restorations are designed by computer-aided design and cut with precision CNC machines. After post-processing by polishing or glazing, personalized staining and porcelain addition, it is bonded to the tooth with a resin cement. This restores the function and aesthetics of the affected tooth. It can be used to create all-ceramic inlays, full crowns, veneers and other restorations. It has the advantages of aesthetics, biocompatibility, precision and speed. It is mainly used for the restoration of tooth defects and discolored teeth. Yang Jian, Department of Prosthodontics, Peking University Stomatological Hospital Advantages: 1. Natural and beautiful color, durable and stable, metal-free, good biocompatibility. 2. The restorations are cut by numerical control equipment, with good edge fit and high precision after completion. 3, convenient and quick, greatly shorten the treatment course, save treatment time. 4, the material used is close to the physical properties of real teeth all-ceramic material, the real teeth wear small. 5.Combined with the bonding restoration, it can retain as much of the remaining tooth tissue as possible. Indications: 1, restoration of tooth defects caused by caries, trauma, etc. 2.Cosmetic restoration of fluorosis, tetracycline teeth and other discolored teeth.