Dental Restoration

This randomized controlled trial (RCT) compares the 24-month clinical performance of endocrown restorations fabricated by two digital manufacturing pathways: additive manufacturing using 3D-printed ceramic-filled photopolymer resin (VarseoSmile TriniQ, BEGO) versus subtractive computer-aided design/computer-aided manufacturing (CAD/CAM) milling from hybrid nano-ceramic blocks (HC Hard Block, Shofu). Sixty endocrowns will be placed in endodontically treated posterior molars and evaluated using modified United States Public Health Service (USPHS) criteria at 6, 12, and 24 months. The trial is conducted at the Conservative Dentistry Department, Faculty of Dentistry, Cairo University.

This clinical study aims to evaluate the clinical performance of 3M™ Filtek™ Supreme Flowable Composite in class IV and veneer indication. Follow-ups of 7 days, 6, 12, and 24 months will be conducted following an Fédération Dentaire Internationale (FDI) modified score (2023). A minimum of 50 Class IV and 25 veneers will be included in the evaluation. Research data and pictures will be provided for each patient pre-op and at 7 days (baseline, 6 months, 12 months and 24 months. Evaluation will be conducted by two calibrated evaluators different from the operator according to FDI clinical criteria.

To compare biological, technical, radiographic, and patient-reported outcomes of two types of monolithic zirconia crowns screw-retained to implant. To assess whether the new form of multilayered zirconia crowns will show similar survival and success rate to conventional monolithic Zirconia screw-retained to implants in molar and premolar regions. First Null Hypothesis: Multilayered monolithic zirconia crowns would have similar survival, success rate compared to conventional monolithic zirconia implant supported crowns. Second Null hypothesis: There would be no difference in clinical and patients related outcomes between multilayered and conventional monolithic zirconia implant supported crowns.

This study will be conducted to: Evaluate and compare the clinical success, periodontal changes, and wear of antagonist teeth for three types of prefabricated crowns in primary molars: BioFlx crowns, Zirconia crowns, and Stainless Steel crowns.