The advent of computer graphics and CAD-CAM have revolutionized dentistry. It is now possible to provide the equivalent of a cast restoration with a single appointment. Several systems are under development, each providing different characteristics and advantages. Some permit the clinician to be actively involved in the design process; others provide complete automation, freeing the clinician for other tasks. Some use technologies similar to those already used in dentistry; others draw technologies that are state-of-the-art in engineering or manufacturing but not dentistry. Some aspects, like...