Digital Dentistry — Digital Impression and CAD/CAM System Applications

Abstract

Digital imprint and computer-aided design/computer-aided manufacture (CAD/CAM) systems offer several benefits compared to traditional techniques. The use of a CAD/CAM system to scan preparations and generate restorations in-office, removes a second appointment for the patient. The existence of precision benefits in using complete systems and chairside scanning systems, has been proven. CAD/CAM restorations have a good longevity and meet the accepted clinical parameters. New digital impression methods are presently accessible, and before long, the long-awaited goal of sparing patients of one the most unpleasant practices in clinical dentistry, acquiring dental impressions, will be exchanged by intraoral digital scanning. CAD/CAM systems existing nowadays, can feed data through accurate digital scans created from plaster models, straight to manufacturing systems that can shape ceramic or resin restorations with no requirement of a physical copy of the prepared, adjacent, and antagonist teeth.

Evaluation of marginal adaptation in three-unit frameworks fabricated with conventional and powder-free digital impression techniques

“…However, scanning with powder, low-resolution, and insufficient computing power caused restorations with unacceptable values of marginal misfit 10. The CEREC 1 system (Sirona Dental Systems GmbH, Bensheim, Germany) was the first commercially available intraoral impression system and was developed in 1987 1112. With the development of fabrication technology and engineering, highly accurate scanners, more advanced software, and several digital intraoral impression systems have become available 11121314.…”

“…The CEREC 1 system (Sirona Dental Systems GmbH, Bensheim, Germany) was the first commercially available intraoral impression system and was developed in 1987 1112. With the development of fabrication technology and engineering, highly accurate scanners, more advanced software, and several digital intraoral impression systems have become available 11121314. With these systems, crowns or FPDs can be fabricated on the images of the prepared teeth captured by the intraoral scanning device 111215.…”

“…With the development of fabrication technology and engineering, highly accurate scanners, more advanced software, and several digital intraoral impression systems have become available 11121314. With these systems, crowns or FPDs can be fabricated on the images of the prepared teeth captured by the intraoral scanning device 111215. As a consequence, several problems of conventional impression making can been eliminated 1116.…”

“…The digital impression is a noninvasive technique, which involves the use of an intraoral scanner of small dimensions that does not create discomfort for the patient. The scanner records a series of snapshots of the oral cavity of the patient, which are transferred onto a computer where they will be processed and a virtual model will be obtained 12. In this way, all the requirements expected from the restoration can be examined from the data obtained and the desired restoration planning can be realized.…”

“…Today, retraction cords and rubber dams are used for this purpose. Otherwise, it is inevitable that the produced restorations will fail clinically 12…”