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Abstract Summary and Conclusion This in vitro study was performed to evaluate the the effect of cementation techniques and surface treatments on the retention of hybrid ceramic cad/ cam endocrowns. Lower first molar teeth of nearly similar dimensions were selected, the intact crowns were removed by a horizontal section 1 mm above the CEJ. To standardize the depth of pulp chamber (3mm) a glass ionomer cement base was applied to the pulp chamber floor. The standardized depth was verified using a Digital Depth Micrometer (Mitutoyo, Aurora, IL, USA). Obturation of the canals was performed to the orifice level. Each tooth was embedded in a block of self-polymerizing acrylic resin with the long axis perpendicular to the base of the block and with the acrylic resin ending 2 mm below the cementoenamel junction. The molars were restored with endocrowns using the Cerec in lab CAD/CAM system (Sirona Dental Systems, Germany). All restorations were milled in hybrid ceramic (VITA ENAMIC® for CEREC®/ inLab®, VITA Zahnfabrik H. Rauter GmbH & Co.KG., Germany). The anatomy of the occlusal surface and the thickness of their endocrown restorations was standardized with the aid of Cerec In Lab software and the biogeneric copy option. The specimens were classified into four groups according to the surface treatment of the endocrowns, and cementation technique. |