1, mandibular angle grinding and plastic surgery. This operation is to remove the cortical bone of mandibular angle and mandibular outer layer by grinding head, and the mandibular angle is not removed. Sometimes the mandibular angle can be slightly or slightly removed by using a suitable grinding head, and the grinding thickness is limited, only 5~6mm at most, and the improvement effect is not obvious.

Advantages: simple and safe operation, less bleeding.

Disadvantages: limited effect. Suitable for people with moderate mandibular angle and wide mandibular angle from the front. 2. Osteotomy and mandibular angle shaping, or tangent osteotomy and mandibular angle shaping. This kind of operation is to drill or slot with a ball drill first, then cut off the mandibular angle and mandibular outer plate with a fine bone knife, or directly cut off the mandibular outer plate with a wire saw, leaving cancellous bone and inner plate. Like the bone grinding method, the mandibular angle is not removed, and the original curvature of the mandible is retained, but the width of the mandibular angle is narrowed, and the side view is not improved much.

Advantages: the original mandibular radian is retained, which is suitable for people who want to reduce the mandibular width but want to retain the mandibular angle.

Disadvantages: limited promotion; Because the osteotome is used in the operation, violent operation may cause fracture, and the risk of inferior alveolar nerve injury also exists. 3. Long curve mandibular angle shaping. In this operation, an arc saw osteotomy was used to cut the mandibular angle, which widened the distance between the cutting line and the mandibular sulcus nerve and greatly improved the side view. Moreover, the masseter lost the attachment of the mandibular angle and slowly shrank, which also solved the problem of masseter hypertrophy. In order to shape the beautiful curve of the mandible, it is sometimes necessary to remove part of the bones at the outer edge of the mandible, and it needs to be coordinated with the curvature of the mandible.

Advantages: one-step cutting, one-step completion, less damage, short time and quick recovery. According to the aesthetics of mandibular angle radian, the risk of increasing the distance between the cutting line and the mandibular sulcus nerve is small, which accords with the stress principle of mandibular angle. Specially made mandibular angle instrument to solve the problems of outer plate and inner plate. The radian of mandibular angle conforms to aesthetics and has beautiful appearance. There is almost no need to polish after one cut.