The enlarged jaw angle causes the lower 1/3 of the face to widen, resulting in a masculine facial contour and a face that does not meet our usual aesthetic standards. We have performed jaw angle osteotomy in our department for many years and accumulated thousands of cases. We have used different surgical methods for different jaw angle cases and received good results in improving facial contour. Diagram of surgical method: For jaw angle with 90° right angle and convexity and severe hypertrophy, we design a large amount of bone cutting. The method used is long line jaw margin + jaw angle + mandibular ascending osteotomy, as shown in the figure: For those with a slightly softer jaw angle and moderate width of the mandibular ascending branch, we can use the “oblique cut” method, using the rifling saw to directly cut the bone, and mastering the angle of oblique cut, we can remove the outer plate and the inner plate including the jaw angle, as shown in the figure: For those with The following figure shows the outer plate, and the inner plate with the angle of the mandible in the inner plate: Case 1: Case 2: Discussion: The most important concern of the surgical patient is safety. I have repeatedly answered this question, due to the strict regulation of the national team jaw surgery, non-Triple A hospitals are prohibited to carry out this type of surgery, Triple A hospitals can provide protection is the formal plastic surgery, with supporting anesthesia, ICU, a hospital can carry out this surgery is after repeated examination and inspection. The doctor has gone through formal training (let’s say I am a doctor of plastic surgery at the Ninth People’s Hospital in Shanghai) and has had the required number of surgeries before the Department of Health will approve the hospital to carry out this surgery. The qualification of the hospital and doctor is the first hurdle, and then the patient will still worry about whether the surgery will happen accidentally, this problem involves the complications of surgery, generally speaking the complications of jaw angle osteotomy will be the following: 1, swelling 2, mild differences between the left and right 3, N, BV pulling injury 4, accidental fracture These complications we will explain to the patient one by one. The surgery is an intraoral incision, and the stretching and exposure make swelling unavoidable, but we strictly control the surgery time through skilled surgery, so that the short exposure time will reduce swelling; generally simple mandibular osteotomy will be finished in 40~50 minutes, and we inject epinephrine-containing saline before the surgical incision to constrict blood vessels and reduce bleeding; and the peeling is complete under the periosteum to reduce muscle and After surgery, we apply pressure bandages to reduce blood leakage. All these measures will reduce the swelling somewhat, and the fastest swelling in my patients has largely subsided and returned to near normal in a week. In order to ensure the bilateral osteotomy symmetry, we use a grinding head to grind a shallow groove on the cortical surface of the bone before osteotomy, then measure left and right, and after the basic symmetry, grind through the outer plate again according to this marked groove. If the rifling saw is beveled, it is possible to saw through the osteophyte and inner plate according to this marked line. Since the outer plate is ground through before the splitting or osteotomy, the inner plate and mandibular angle will be cut according to this line during the splitting and gouging to avoid accidental fracture. The design of this line is based on the shape of the mandible and the position of the inferior alveolar nerve sulcus, which is shown in the figure: the image of the nerve canal can be seen in front of the dotted line. The design of the osteotomy line is performed on the 3D CT. You can see the chin hole on the mandible, which is the opening of the inferior alveolar nerve, the chin hole. The osteotomy line should be lower than the nerve canal.