The histopathology of the apical area where conservative endodontic treatment has failed.
D005069:Evaluation Studies as Topic; D006801:Humans; D010484:Periapical Granuloma / Q000473:pathology*; D011842:Radicular Cyst / Q000473:pathology*; D012389:Root Canal Obturation / Q000009:adverse effects; D012390:Root Canal Therapy / Q000009:adverse effects*