ABSTRACT
The bone defect in the maxillofacial region generally can be categorized to three types according to the size of defects. The first category is the cavitary bone defect which is less than 3 cm in length and need from 5 to 10 ml of bone tissue for reconstruction. For such defects, the particular cancellous bone marrow grafting harvested from iliac crest is per formed. The second category is the segmental bone defect which is from 3 cms to 6 cms in length and the bone tissue is from 10 to 13 ml. Such defects are often caused by the resection of mandible due to the benign tumor. The interpositional grafting of iliac bone is performed. The third category is the largest bone defect with a free end which is more than 6 cm in length. It needs approximately 20 ml of bone tissue for reconstruction. Such large bone defect is usu ally caused by the hemimandibulectomy due to the oral cancer. The free vascularized osteocutaneous flap is commonly applied for the reconstruction (Fig. 1).
