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Advances in adhesive dentistry, computer-aided design and computer-aided manufacturing (CAD-CAM) technologies, and ceramic materials have resulted in the introduction of new systems of dental restorations, 1-3 including the endocrown restoration, which reduces the risk of failure during intracanal post preparation. 1,4 An endocrown is a monobloc restoration that combines the crown and the core as a single unit. 5,6 It covers all cusps with a circular shoulder margin and extends toward the pulpal floor. Endocrowns use the available surface provided by the axial walls of the pulp chamber as macromechanical retention, while the adhesive resin cement acts as micromechanical retention. 5,6 Endocrowns have been reported to be successful restorations for endodontically treated molars with extensive loss of coronal structure. 7,8 Adaptation is one of the most important factors for the success of any restoration. 9 Poor marginal adaptation increases plaque accumulation, which could lead to secondary caries, periodontal disease, and endodontic inflammation. 9 A thick cement layer increases polymerization shrinkage and interfacial stresses, which in turn The study was supported in part by GC, Dental Products Co. Prodent and CADent Dental Laboratory provided CAD-CAM support.