RMBF was comparatively assessed in patients with lower jaw fractures under orthopedic therapy of the osteal suture. To this end, the 99m pertechnetate was injected bilaterally in masseter muscles. The data suggest that double jaw fixation had an adverse effect on RMBF, especially ipsilateral to the fracture. Nevertheless, the mineral metabolism intensity in the callus is higher under fixation as related to the cases surgically sutured.