الفهرس 
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Abstract
The aim of this study was to investigate the influence of the Cerec different
digitizing techniques on the marginal accuracy and internal fit of all-ceramic
crowns using the Cerec Bluecam, 3D camera, Cerec inLab, and the Cerec
Ineos Camera. A stainless steel die was constructed to simulate the average
dimensions of a prepared upper first premolar with 6 mm height, 6°
convergence angle, and a shoulder finish line 1 mm in thickness. The die
was scanned with the four-cerec scanners and the margin accuracy and
internal fit were measured using the stereomicroscope. Repeated measures
ANOVA were used to compare between the four techniques. The mean and
standard deviation values of internal fit were 127 ± 25.4 μm, 127.6 ± 27 μm,
116.4 ± 17.5 μm and 113.8 ± 20.6 μm with 3D camera, Blue Cam, Ineos and
Inlab, respectively, while the mean and standard deviation values of
marginal accuracy were 68.8 ± 14.8 μm, 34 ± 2.2 μm, 84.8 ± 13.4 μm and
56.8 ± 14.1 μm with 3D camera, Blue cam, Ineos and Inlab, respectively.
Conclusion: The different digitizing techniques Bluecam, 3D camera, Inlab,
and Ineos had no influence on the internal fit, however the Scanner type
influences the margin accuracy of all-ceramic crowns.