Dens invaginatus. Review of formation and morphology with 2 case reports.

Dens invaginatus manifests itself with an aberrant morphologic character because of altered patterns of tooth formation. Presented in this article are 2 cases of dens invaginatus in maxillary lateral incisors that were successfully treated nonsurgically. In the first case, a circular main canal was clearly observed surrounding the invaginated canal. The involved tooth in the second case responded to electric pulp testing, though a periapical radiolucency was evident; root canal treatment of the invaginated canal failed to resolve the pathosis. Debridement of both the main canal and the invaginated canal produced resolution. The complex morphologic nature of these root canal systems and the close relationship between the invaginated and main canals is demonstrated and discussed.