Existing devices are driven by several non-contact optical technologies such as confocal microscopy, optical coherence tomography, photogrammetry, active and passive stereovision and triangulation, interferometry and phase shift principles. The main advantages in the employment of those devices are: high fidelity models, creation of 3D archives and surgery simulation and a process simplification. Generally speaking such scanners try to face with problems and disadvantages of traditional impression fabrication process such as, in particular, mould instability, plaster pouring, laceration on margins, geometrical and dimensional discrepancy between the die and the mould. Nowadays, ten intra-oral scanning devices for restorative dentistry are available all over the world: four of them are made in USA, two in Israel, two in Germany and one in Italy, in Switzerland and in Denmark. These systems are capable of capturing three-dimensional virtual images of tooth preparations from such images restorations may be directly fabricated (using CAD/CAM systems) or can be used to create accurate master models for the restorations in a dental laboratory (1). Ever since research and development sectors at a lot of companies have improved the technologies and created in-office intraoral scanners that are increasingly user-friendly and produce precisely fitting dental restorations. Werner Mörmann, and an Italian electrical engineer, Marco Brandestini, that developed the concept for what was to be introduced in 1987 CEREC® by Sirona Dental Systems LLC (Charlotte, NC) as the first commercially CAD/CAM system for dental restorations (1, 3). Digital impressions have been introduced, and successfully used, for a number of years in orthodontics, as well, including Cadent’s IOC/OrthoCad, DENTSPLY/GAC’s OrthoPlex, Stratos/Orametrix’s SureSmile, and EMS’RapidForm but the introduction of the first digital intraoral scanner for restorative dentistry was in the 1980s by a Swiss dentist, Dr. The developed system was presented at the Chicago Midwinter Meeting in 1989 by fabricating a dental crown in 4 hours (1, 2). In detail he developed and patented a CAD/CAM device in 1984. Francois Duret in his thesis presented at the Université Claude Bernard, Faculté d’Odontologie, in Lyon, France in 1973, entitled “Empreinte Optique” (Optical Impression).
The introduction of CAD/CAM concepts into dental applications was the brainchild of Dr.
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