diagnosis and treatment of a type iii dens invagination using cone-beam computed tomography

a 20-year-old man presented with the history of pain and swelling in the anterior maxillary segment. the periapical radiography was indicative of a dental anomaly in right maxillary lateral incisor. due to the insufficient information from conventional radiography, cone-beam computed tomography (cbct) was ordered. cbct showed apical root resorption, large apical lucency and two separate canals with distinct apical foramen (oehlers type iii dens invagination). the cbct image was used as a guide for dentine removal with an ultrasonic tip. conventional root canal therapy was done using lateral compaction technique. one-and two-year follow-up radiographies revealed periapical repair and absence of symptoms.