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Abstract

Objectives: To compare marginal and internal fit as well as marginal chipping of e.max (EM) and Celtra Duo (CD) all-ceramic crowns fabricated using chairside economical restoration of esthetic ceramics (CEREC) system. Material and Methods: Tooth # 15 was prepared for an all-ceramic crown on an ivorine typodont. A total of 15 CD and 15 EM crowns were designed and fabricated using CEREC Omnicam and CEREC MC XL milling chamber. Micro-computed tomography (micro-CT) was utilized to assess marginal and internal fit of crowns in both groups. Marginal gap (MG) measurements were done at 20 systematically selected points per crown. Internal gap (IG) was measured at 70 systematically selected points in each crown. Crowns with MG > 120 μm at more than five points were considered unacceptable. Clinical assessment was considered as an additional criterion for rejecting unacceptable crowns. Clinical assessment was done according to United States Public Health Service (USPHS) criteria that scores clinically acceptable restorations as Alpha and Bravo and unacceptable restorations as Charlie and Delta. A scanning electron microscope (SEM) was used to evaluate the extent and severity of marginal chipping. Results: CD crowns had significantly smaller MG (46 ± 25.42 µm) as compared to EM crowns (65 ± 29.08 µm) (p-values