Thesis (M.Sc.) - Cairo University - Faculty of Oral and Dental Medicine - Department of Prosthodontics

Introduction: The original technique of endocrowns described the use of porcelain, in vitro thermo-mechanical aging showed that endocrowns made of more flexible composite resin or newer resin nanoceramic materials may also have a successful outcome. The aim of the present study was to evaluate the marginal integrity of endodontically treated teeth restored with CAD/CAM ceramill® comp and cerasmart endocrown bonded with two adherence protocols (total etch and self-etch) before and after thermo-mechanical aging. Materials and methods: A total of 28 freshly extracted human mandibular posterior teeth were collected. Teeth were sectioned perpendicular to the long axis 2mm coronal to the proximal cementoenamel junction. The molar teeth were randomly divided into two main groups according to the type of the endocrowns material used and two subgroups according to the bonding protocol. Group 1: Restored with cerasmart endocrowns (14 samples). Subgroup (a): Total etch bonded cerasmart endocrowns (7 samples). Subgroup (b): Self-etch bonded cerasmart endocrowns (7 samples). Group 2: Restored with ceramill® comp endocrowns (14 samples). Subgroup (a): Total etch bonded ceramill endocrowns (7 samples). Subgroup (b): Self-etch bonded ceramill endocrowns (7 samples). All samples were subjected to thermo-mechanical aging to simulate one year. Vertical marginal gap distance was evaluated before and after aging. Using stereomicroscope with a fixed magnification of 90X. Then the data obtained were collected, tabulated and then subjected to statistical analysis

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