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Abstract
The emergence of different types of scanners and competition in the market raise a question on the influence of these different scanners on the margin accuracy and internal fit of the CAD / CAM generated all - ceramic crowns. Three prefabricated titanium implant abutments representing upper first premolar were selected. Three implant abutments were scanned and divided into 3 groups as follows: group 1: consisted of 5 scans using the cerec bluecam. Group2: consisted of 5 scans using the cerec omnicam. Group3: consisted of 5 scans using the Cerec Ineos camera. Ceramic crowns were prefabricating from vita mark II. The vertical marginal gap distance between the crown and the implant abutment was measured using stereomicroscope connected to computer and digital camera. Measurements were made at thirty points for each surface of the crown. A rubber base replica of the space between the crown and the implant abutments was made for each tested specimen to assess its internal fit using the stereomicroscope. The recorded data were collected, tabulated and statistically analyzed. it was found that the mean and standard deviation values of marginal accuracy data were 130 ± 3 æm, 320 ± 3 æm and 100 ± 2 æm with blue cam, Ineos and omnicam, respectively