External resorption of a maxillary incisor associated with a canine with a deviating eruption path: a case report.

The aim of this case report is to describe the treatment of an 11-year-old boy who was referred to an endodontist for evaluation of external inflammatory root resorption in the distal apical third of the permanent maxillary left lateral incisor, caused by deviation in the eruption path of the permanent maxillary left canine. The results of the pulpal sensitivity test of the permanent maxillary left lateral incisor were inconclusive and similar to those for the homologous tooth, so the endodontist opted for a clinical and radiographic follow-up. The patient was referred to an orthodontist, who placed a fixed Haas-type palatal expander. After the eruption of all permanent teeth, the orthodontist placed a fixed orthodontic appliance. After approximately 3 years of monitoring, bone repair with dental remodeling was observed, and the results of a pulpal sensitivity test were positive. This case demonstrates that proper monitoring is critical in establishing the diagnosis and treatment plan and ultimately to the success of clinical management.