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Indications include inlays, onlays, veneers, and crown restorations. The materials used in the CEREC 3D system (sintered ceramic blocks) are close to natural teeth in strength, beauty, and function. The complete procedure takes approximately one hour. Finally, the dentist bonds the milled restoration into the patientÃs mouth. The dentist designs the virtual model using CAD software, and then a milling machine directly mills the restoration from a block of ceramic material. A virtual model of a patientÃs teeth is then created using a computer. Precise optic lenses capture the shape of the tooth preparation. The new CEREC 3D system (Sirona Dental Systems) introduced in 2003 uses intraoral imaging and computer technology to fabricate dental restorations in the dental clinic to shorten treatment time. The first system to be introduced into the dental market was the CEREC1 (Sirona) for aesthetic, all-ceramic, chairside single- or dual-surface inlays using VITA-BLOCS Mark II (Vident).
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The development of CAD/CAM systems for dental applications first began in Europe in the 1970s.
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The CAD/CAM systems that are used in dental applications generally consist of 3 modules: (1) a scanner, which scans a solid model and converts the model into digital data (2) a design software package, which is used to design and modify the digital model and (3) a milling machine, which mills the designed model using a selected material. In recent years, the use of CAD/CAM systems has become popular in dentistry.