Abstract
Dens invaginatus is a morphological abnormality of the tooth that results from a developmental anomaly during tooth formation, in which part of the enamel and dentin of the crown invaginates into the pulp cavity. This report describes a case of a maxillary lateral incisor with apical periodontitis apparently caused by Oehlers Type III dens invaginatus. The patient was a 69-year-old man who visited our clinic complaining of discomfort in the maxillary right lateral incisor. Cone-beam computed tomography (CBCT) revealed dens invaginatus of the maxillary lateral incisor and a sinus tract in the maxillary central incisor region, which was derived from apical periodontitis of the maxillary lateral incisor. The dens invaginatus was accompanied by a complex root canal morphology. Treatment, which was performed using a dental surgical microscope, had a favorable outcome. The patient remains in good condition at 1 year postoperatively.
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