Radicular dens invaginatus associated with radicular cyst in maxillary third molar – Rare case report

Dens invaginatus is a developmental tooth anomaly showing broad spectrum of morphological variations. Most extreme form of the invagination results in a bulbous expansion of the affected crown and/or root has been termed as dilated odontome. Radicular dens invaginatus is a rare dental anomaly formed by infolding of Hertwig's epithelial root sheath and in few forms invagination is lined by enamel. Various techniques of treatment including conservative treatment, nonsurgical root canal treatment, and endodontic surgery usually are unsuccessful because of their complex morphology and are associated with periapical lesions. We report a case of radicular dens in dente with dilated root and was associated with radicular cyst in the right maxillary third molar in a patient aged 38 years. Histological examination showed a dilated bulbous root with enamel formation within root invagination and the associated radicular cyst was lined by pseudostratified ciliated columnar epithelium.