Nonsurgical endodontic treatment of Type III dens invaginatus in maxillary canine: an 18-month follow-up.

Dens invaginatus (DI) is a developmental variation resulting from an infolding of the outer enamel surface of a tooth into the interior. The greatest difficulty in the endodontic treatment of DI is in locating the rudimentary root canal, because of the atypical internal morphologic complexity. Invagination may also restrict sufficient cleaning and shaping. This case report describes a nonsurgical root canal treatment of Type 3 DI in a maxillary canine. Despite the complex anatomy of dens invaginatus, nonsurgical endodontic treatment was performed successfully and at follow-up examination after 18 month, healing was achieved without any need for further surgical intervention.