“Fracture Resistance of Endodontically Treated Maxillary Incisors Restored by Two Designed Endocrowns Using Two Materials

Abstract

This study is conducted to evaluate the fracture resistance of endodontically treated maxillary incisors restored by endocrowns using two ceramic materials; lithium disilicate and polymer infiltrated ceramic in comparison to conventional fiber posts, core and full coverage crown. A total of thirty sound, carious free human maxillary incisors were freshly extracted due to periodontal disease. Teeth were divided into two groups; (I) to receive endocrowns and (II) to receive full coverage crowns. each group was further divided into two subgroups; (L) for lithium disilicate and (V) for Vita Enamic. Teeth were endodontically treated and then mounted into acrylic resins blocks using A.M.D dental surveyor. Computer numerical control machine (CNC) was used to standardize the preparation in all teeth. All teeth were scanned using an omnicam scanner and then the designed was established to receive the purposed restorations for each group. Wet milling technique of the CAD blocks was used. Restorations were glazed, finished and polished and cemented. The restorations were tested for fracture resistance using universal testing machine. E.max restorations showed higher fracture resistance in comparison to Vita Enamic. Different designs showed no significant difference.