This report describes non-surgical treatment of an invaginated maxillary lateral incisor with three roots. The mesial root had a C-shaped canal, while the distal one had a type III dens invagination. Cone beam computed tomography (CBCT) was used as an adjunctive resource in the diagnosis and making decision about the required treatment. Clinical and radiographic follow up after 15 months revealed satisfactory periapical healing and absence of symptoms after 15 months.

The success of root canal treated teeth with periapical lesions have been reported in several studies. However, in some cases, such as traumatic occlusion, these lesions may remains table. On the other hand, the effect of traumatic occlusion in development of pulp and periapical diseases has not been known thoroughly. The article reports the remaining of periapical lesion after appropriate endodontic treatment and surgery. However, the patient symptoms improved after removal of premature contacts and periapical lesion healed.