Clinical Performance of Fiber Reinforced FRC Base and Bonded CAD/CAM Resin Composite Endocrowns Versus Conventional Lithium Disilicate Endocrowns in Posterior Teeth (1y Randomized Clinical Trial).

Inclusion Criteria: * Patients with good oral hygiene * Patients having one or more endodontically treated molars that need prosthetic restoration. * Molars should have enough tooth structure for endocrown restoration with minimum 3 walls with thickness not less than 1.5 mm and gingival step placed supragingival * Fully erupted molars * Molars free of developmental defect * Healthy periodontium * Absence of periapical pathosis * Acceptable endodontic treatment and proper bone support Exclusion Criteria: * Patients with bad oral hygiene * Patients with active periodontal disease * Patients with missing teeth opposing to the area intended for restoration * Patients with parafunctional habits or psychiatric problems or unrealistic expectation.