Computer-assisted milling of dental restorations using a new CAD/CAM data acquisition system

Abstract Background. Recent technologic innovations have created possibilities for restorative dentistry, such as computer-aided design and computer-aided manufacturing (CAD/CAM). Purpose. This article presents a new CAD/CAM process that has been developed for the fabrication of dental restorations. Methods. This process uses an improved imaging technique, successfully applied in other industries. Imaging is accomplished with 2-dimensional line grids projected onto an object, which allows for a mathematical reproduction of prepared and unprepared tooth surfaces, including those that are outside the direct line of light. The relative position of the sensor to the surface of the object is controlled automatically. Conclusions. This system, which is undergoing clinical testing, allows the generation of various types of highly accurate dental restorations (inlays, onlays, crowns, and fixed partial dentures) from a number of different materials. Acquired digitized data points are directly translated from the sensor to the electronic controls of the milling machine to provide various manufacturing possibilities, including copy milling and accurate reproduction of occlusal tooth surfaces in various materials. (J Prosthet Dent 1998;80:346-53.)