We evaluated mandibular rehabilitation using vascularized bone graft and osseointegrated implants. Questionnaires were used to evaluate the masticatory function, and we measured the occlusal force in each patient. In addition, we measured the height of grafted bone to assess the possible relationship between masticatory rehabilitation and the change in bony height. Five of 13 patients showed over 12.0% increase in bony height after superstructure fabrication. Most of the patients who underwent tongue resection scored low points on the questionnaire. Also, most patients with resection, including resection of the angles of the mandible, showed a lower occlusal force than those without.