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Extensive bimaxillary bone support devices(hereafter referred to as a dental implant)are useful for morphological and functional reconstruction after resection of oral cancer. However, tumor recurrence due to peri-implantitis may occur. In this report, we describe a case of squamous cell carcinoma(SqCC)recurrence around a mandibular dental implant. An 80-year- old female patient underwent tumor resection and stratification for SqCC extending from the left lingual margin to the gingiva of the left lower molar in 2013. In 2014, 2 dental implants were placed in the bilateral mandibular canine region and a prosthetic device of implant-overdenture was installed. Six years after the primary tumor resection, a mass lesion was found in the peri-implant area of the left mandibular canine. Upon examination, the patient was diagnosed with SqCC recurrence and underwent radical tumor resection and immediate reconstruction using a submental flap and a reconstruction plate. Additional dental implants were concurrently placed in the remaining mandible. There was no evidence of recurrence, and the patient remains under careful observation so far.

We report a 53-year-old female patient with an unresectable metastasis to the supraclavicular lymph node from a primary gingival carcinoma of the mandible. The patient had a history of tongue carcinoma and had undergone a radical neck dissection for the treatment of gingival carcinoma. She underwent combined chemotherapy consisting of S-1 (80 mg on days 1-14, followed by a 7-day rest), docetaxel (35mg/m2 by intravenous infusion on days 1 and 8), and CDDP (10mg/m2 by intravenous infusion on days 1 and 8) every 3 weeks. After three courses of the above chemotherapy regimen, a computerized tomography examination revealed a complete response. The patient did not experience any severe side effects during the course of chemotherapy. Combined S-1, docetaxel, and CDDP chemotherapy can thus be effective for unresectable recurrences of oral cancer in lymph nodes.

This report concerns two cases of cementifying fibroma showing markedly accumulation of 99mTc -MDP in mandibular lesions. The bone scintigraphic and histopathological findings are presented and discussed.

A 40-year-old male complained of swelling of the right mandible. It was a hard bone tumor which was 70 x 50 x 45 mm in size without tenderness. In serum, the level of IgG was 5814 mg/dl, IgA 95 mg/dl and IgM 8 mg/dl with monoclonal increasing of gamma and lambda-chain. No Bence Jones protein was detected. In a bone marrow aspirate atypical plasma cells were 7.3% in nucleated cells in slightly hypocellular marrow. X-ray examination disclosed a spicule formation surrounding the osteolytic focus in the mandible. In addition, a osteolytic tumor without spicule formation was found in a rib. The histological examination of biopsy specimen obtained from the mandibular tumor revealed that atypical plasma cells infiltrated the fibrous tissue with new bone formation. Spicule formation in the bone lesion of multiple myeloma is unusual.