Present illness: A 65-year-old woman was complaining about nonhealing ulcer of the mandible. Three years earlier the patient was referred to oral and maxillofacial surgery clinic, recommended for evaluation and extraction of three teeth: the mandibular right cuspid and first bicuspid and the mandibular left second bicuspid. The right mandibular teeth were extracted nonsurgically; the mandibular left second bicuspid required a surgical extraction with flap elevation and bone removal. The wounds were healing postoperatively.

Regular routine dental care for 2 1/2 years, reported no problems. Six months before this evaluation, her dentist observed a fracture in the mandibular right second bicuspid, with and adjacent area of red swollen gingiva at the site of the extraction of the mandibular right first bicuspid. After three months, her dentist revealed a persistent nonhealing ulcer at the…