Two cases of simple bone cyst suspected of being odontogenic tumors.

We report here two cases of simple bone cyst suspected of odontogenic tumors. The first case, a 17-year-old female, was introduced to our department by a dental practitioner because of a large radiographic defect of the bone. The patient had no subjective symptoms. The defect extended between 3 and the ascending ramus, and had multilocular radiolucency associated with bone expansion. The Marsupialization and curettage of the defect were performed. One year after the surgery, the defect was filled with new bone. The second case, a 14-year-old male, complained of occlusal pain in the anterior mandible. Irregular and unilocular radiolucency was seen radiographically in 4 + 2. The biopsy suggested an ossifying fibroma. Extirpation and curettage of the lesion were performed. Ten months after the surgery, the bone expansion disappeared.