Management of a non-vital central incisor tooth with three root canals.

A macrodont permanent central incisor tooth with unusual root canal morphology became non-vital 18 months following trauma. Two root canals were initially identified and filled, but the patient continued to have symptoms and radiographic examination indicated apical periodontitis. Careful radiographic and clinical examination revealed a third root canal, which was subsequently treated, resulting in the resolution of symptoms and periapical healing.