This report describes non-surgical endodontic treatment of Oehlers' type III dens invaginatus in a maxillary lateral incisor with the aid of postobturation cone-beam computed tomography (CBCT). The endodontic treatment was initiated with the aid of a surgical operating microscope, and two canals, one of which represented the invagination, were instrumented, irrigated under passive ultrasonic activation and obturated with the lateral condensation technique. As postobturation periapical radiographs suggested the presence of untereated and/or unfilled areas in the root canal and invagination, CBCT was taken to assess the possibility of further treatment. The CBCT scans demonstrated inaccessible and unfilled canal and invagination areas because of complex internal morphology characterized by (i) C- or ring-shaped cross-sectional canal configuration with constrictions at different points in different root levels and (ii) a prominent intraradicular cavity that was communicated with the enamel-lined invagination and opened into the apical periodontium. Thus, it was judged that further endodontic treatment was not feasible. A 14-month follow-up revealed a satisfactory clinical and radiographic outcome, suggesting that the chemomechanical debridement may have sufficed to induce periapical healing. CBCT greatly helped the decision of avoiding further intervention that could have been difficult to negotiate.

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The aim of this study was to investigate coronal leakage after obturation with mineral trioxide aggregate (MTA), resin-based sealer, and silicon-based sealer for open apical foramina and to evaluate pathway of leakage. Twenty-eight maxillary premolars were used, and instrumented to ISO size #80. Teeth were randomly divided into four groups as follows: Group A filled with MTA, Group B with gutta-percha and resin-based sealer, Group C with polymer-based material and resin-based sealer, and Group D with gutta-percha and silicon-based sealer. All samples were evaluated for coronal leakage with methylene blue solution and spectrophotometry. After leakage testing, samples were cut, and sections were observed. Dye leakage of Group A was significantly lowest among all groups at 15 days and 30 days. Defects which induced coronal leakage in resin-based sealer were observed at 7 mm from the apex. Coronal leakage after obturation with MTA for open apical foramina was significantly lower than resin-based sealer and silicon-based sealer.