الفهرس 
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Abstract
This in-vitro study was conducted to compare the fit accuracy of CAD/CAM zirconia crowns fabricated by digital scanning of dies and scannable silicone impressions. An ivory upper premolar tooth was prepared to receive full ceramic crown then scanned with an intraoral scanner to fabricate twenty 3D printed resin master dies. The resin master dies then seated in a typodont model for making the digital impressions. two groups of CAD/CAM crowns (n=20) were produced and evaluated in this study; group 1, crowns fabricated from scanning of the master dies in a typodont model with Omnicam intraoral scanner, group 11, crowns fabricated from scanning of scannable PVS impressions using InEos X5 extraoral scanner.
Twenty CAD/CAM crowns were designed and milled using the same software and milling machine from monolithic zirconia disc. Each crown was temporary cemented to its corresponding die using water soluble try in paste, CBCT images were obtained of each crown then the data were sent to statistical analysis.
The CAD/CAM crowns fabricated by direct scanning showed significantly better marginal fit than the indirect scanning of scannable impressions.