Correction of mandibular angle hypertrophy is risky and complicated. There are three methods for operation: intraoral, extraoral and extraoral combination. Surgical scars will be left outside the anterior mouth (incision on the lower edge of the earlobe or mandible), so intraoral incision has been used in recent years. The specific operation steps are as follows: 1.

The phalanx line was designed before operation, and the mandibular angle was measured according to X-ray before operation. At present, computer-aided and rapid prototyping technology is used to scan the mandible and make a solid model of the mandible. According to the model design, the range of mandible was cut off. Osteotomy methods include partial resection of mandibular angle, sagittal split resection of outer plate and partial resection of masseter muscle.

Anesthesia: The operation is performed under general anesthesia or local intensive anesthesia.

Incision peeling: the incision is located at the bottom of buccal gingival sulcus, exposing the mandibular angle layer by layer.

Osteotomy: according to the designed bone line, the mandibular angle bone is cut off with a surgical saw, and then the outer plate is polished smooth with a grinding head osteotomy. Sagittal split resection includes mandibular angle osteotomy and lateral plate resection to reduce the distance between the two jaws.

Partial excision of masseter muscle 6 in patients with masseter muscle hypertrophy.

If necessary, suture, pressure dressing and negative pressure drainage for 2-3 days.