Excision method: the inner plate of the hypertrophic mandible can be removed, which can improve the crowd with obvious valgus and hypertrophy of mandibular angle. The patient's face has been greatly improved from the side, which is suitable for those who need perfect curvature from the side, but have little improvement from the front. In this way, the patient can see the removed bone.

According to face-changing experts, there are four kinds of incision methods for mandibular angle osteotomy and correction: extraoral incision, intraoral incision, combined incision inside and outside the mouth and retroauricular incision. At present, most mandibular angle hypertrophy is corrected by intraoral and extraoral incision. Extraoral incision is a skin incision several centimeters long at the lower edge of mandibular angle under local anesthesia, and then the masseter muscle is exposed to cut off the masticatory muscle. If there is osteoporotic mandibular angle, it is necessary to cut the appropriate part into an arc, then smooth it with a bone file and sew up the periosteum, muscle, subcutaneous and skin layer by layer.