Computer-aided design and computer-aided fabrication technology, referred to as CAD/CAM, is a new dental prosthetic process that uses optoelectronics, computer information processing and automated machining technology for the fabrication of dental restorations. The technology began in the early 1970s and was initially used for the design and fabrication of fixed dental restorations, and many dental CAD/CAM systems have emerged one after another. After these years of development, dental CAD/CAM system has been able to successfully produce not only inlays, veneers, crowns, fixed bridges and other fixed restorations, but also initially used in the design and production of movable partial denture, full denture. I. Superiority 1. Patients only need one visit, and excellent restorations can be made for them within a few minutes; 2. The process of making restorations is basically automated, eliminating the tedious process of making restorations; 3. Part of CEREC 1. Laser camera: The image of the prepared tooth can be taken directly from the patient’s mouth and converted into a digital signal to be displayed on the computer screen to form an optical impression. 2, computer-aided design: the doctor on the screen through the human-computer interaction program for the design of the restoration, including shape, edge distance, adjacent, etc., and then the computer will automatically calculate and design the three-dimensional spatial data of the restoration, and display the three-dimensional shape or cross-sectional shape of the restoration, the doctor can also be touched up and morphological trimming. 3. Computer-aided production: After the design is completed, the computer can automatically process ceramic inlays, veneers and full crowns by controlling two three-degree-of-freedom CNC machining grinders, which can generally be completed in less than 20 minutes. After the restoration is tried on and refined in the patient’s mouth, the bonding can be completed.