A technique of mandibular osteosynthesis with a bone suture is described, consisting in the formation of 2 pairs of through holes close to the fracture plane and fixation of fragments with a thread drawn alternately through the upper pair of holes and, after a preliminary crossing on the internal surface of the bone and overlapping the lower edge of the mandible, through the lower pair of holes. The horizontal portion of thread passing longitudinally between the upper holes is entrapped with one of the thread ends, then the thread is stretched tight and its ends are tied. A wire may be used as suture material. This technique was used in the treatment of 38 patients.