Case report: Uncommon maxillary lateral incisor with a type 3 invagination and C-shaped root canal system.

Dental practitioners are often called upon to provide endodontic services for patients in pain. Maxillary lateral incisors may present added concerns when planning endodontic services. Dens invaginatus (DI) Oehlers Type 3 classification is a relatively rare phenomenon that occurs primarily in maxillary lateral incisors. It is important to consider this condition in all maxillary lateral incisors and to be aware that it can be difficult to treat when the invagination extends past the epithelial attachment apparatus. Successful outcome may be severely compromised in these cases and requires interdisciplinary approaches. This case study describes a maxillary lateral incisor with DI Type 3 that was refractory to treatment.