Ameloblastoma is the most agrressive ofht odontogenic tumors and it arises from the dental lamina or the derivatives of lamina. Ameloblastoma is a benign but locally invasive neoplasm consisting of proliferating odontogenic epithelium lying in a fibrous stroma. Usually the ameloblastomas are diagnosed in the forth and fifth decardes. Over 80% of them occur in the mandible, the remainder in the maxilla. The preferred treatment for ameloblastoma is radical excision, conserving(when possible. the inferior border of the mandible. The functional and esthetic rehabilitation of the partially edentulous patient may prevent the remaining structures from supporting conventional prosthetic treatment. Patients with long edentulous spans, malpositioned teeth, residual ridges defects and high muscle attachments may be offered an osseointegrated fixed prosthesis. Osseointegrated dental implants provide a viable alternative of tooth replacement. This is a case report of 16 year old female with ameloblastoma. We treated patient with radical excision, conserving the inferior border of the mandible and allogenous bone graft. The defected residual ridge area was reconstructed implants(Steri-Oss Implant System). the result was satisfactory.