THE ACCURACY OF A HIGH-PRECISION DIGITIZER FOR CAD CAM OF CROWNS/

An alternative method for manufacturing fixed prostheses that uses mac hine digitalization and a combination of milling and spark erosion has been developed. The digitizer used has a contact probe with a ball-sh aped tip. This study evaluated the accuracy of the device and the tran sfer of data from the individual die to the computer. The dimensions o f a square gauge as read by the machine were compared with the known d imensions of the object with a computer, which allowed determination o f the accuracy of the digitalization. Procera machining and the implic ations for reliable prosthodontic treatment are discussed.