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A 25-year old female was referred with gingival recession and pus discharge associated with bony dehiscence in relation to previously root canal treated maxillary left lateral incisor. Radiographic examination revealed presence of a second canal which was left untreated in the previous treatment which could be the possible cause of treatment failure and development of bony dehiscence. During re-treatment, the second canal was located, cleaned and shaped and obturated and the bony defect wasdoi:10.5368/aedj.2010.2.4.132-135.pdf fatcat:wjolrnaekfhyfkfzg3myc64zsu