Pack A R, Chandler N P
Department of Periodontology, School of Dentistry, University of Otago, Dunedin.
N Z Dent J. 1996 Jun;92(408):46-8.
This report describes an instance in which treatment of a maxillary lateral incisor tooth failed to resolve the presenting endodontic-periodontal lesion. The predisposing aetiological factor was a longitudinal developmental groove extending from the cingulum to the apex of the tooth.