A three-dimensional evaluation of a laser scanner and a touch-probe scanner

Marginal Accuracy and Fracture Strength of Implant Supported Zirconia Copings Constructed Using CAD/CAM and MAD/MAM Techniques

“…Moreover, the optical scanning system is technique sensitive compared to mechanical digitization devices. The optical properties of the object scanned may affect the accuracy of the scanned data (28) . this technique tends to round off sharp edges, such as sharp line angles and margins, whereas the touch probe scanner reproduce sharp edges accurately, which leads to better margins in the restoration.…”

3D surface imaging in dentistry – what we are looking at

“…In the case of a tooth, whether prepared or unprepared, it is composed of complex irregular geometric confi gu rations that are unique in each case and where there is no exact reference form. 11 Even with these potential problems there are several advanced dental CAD/CAM systems now available. These include systems which are capable of directly scanning within the mouth, namely:…”

Three-dimensional evaluation of the repeatability of scans of stone models and impressions using a blue LED scanner

“…The increasing use of digital scanners in dentistry requires that they generate accurate and reproducible models at each scan (high repeatability) 1,2) . Conventional prosthetic fabrication methods require the establishment of a model by pouring stone into an impression from a patient.…”

“…For these reasons, the development of reliable methods to obtain threedimensional impressions of a patient's oral structures using an extraoral scanner is increasingly important [3][4][5][6] . Scanning a stone model using an extraoral scanner is a common approach, and previous studies have shown a higher repeatability of stone model scanning than that of impression scanning 1,3,7) . Recently, blue LED scanners have been developed that can scan both models and impressions with high stability, even in narrow and deep shapes, and at a high speed.…”