It consists of two milling arms containing diamond instruments as well as a water reservoir for irrigation of the diamonds during the milling process. The second piece of hardare is the Milling Chamber. The primary functions of the Acquisition Unit are to optically record a digital image of the cavity preparation to the computer and design the restoration with the CEREC 3D software program. The Acquisition Unit consists of an intraoral camera, computer, color LCD monitor, keyboard, and trackball assembled in a mobile unit.

The CEREC 3 System is designed for dental operatory use and consists of two separate hardware pieces. Since then, the system has evolved through a series of hardware and software upgrades to expand the restorative capabilities of the CEREC 3 system to include posterior inlays, onlays, and crowns, as well as anterior crowns and veneers. 1 The initial CEREC 1 unit was used to deliver a ceramic inlay for the first time in 1985. The CEREC System was initially developed in the early 1980s specifically to deliver ceramic restorations by a dentist during a single appointment. The CEREC System (Sirona Dental Systems) is one such digital system that applies CAD/CAM technology for restorative dentistry that has undergone a number of recent innovations. A number of digital systems have been introduced that offer dentists the opportunity to deliver restorative treatment without the need for impressions and stone casts. Computer Assisted Design/Computer Assisted Machining (CAD/CAM) is a technological innovation for dentistry that has significantly affected materials and processes in both the dental laboratory and clinic. Advances in technology continually challenge dentists to re-evaluate their current techniques for patient treatment.

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