Silicone gel prosthesis chin augmentation, autologous bone graft chin augmentation and chin horizontal osteotomy chin contouring are the commonly used surgical methods for treating chin deformity in plastic surgery. However, each surgical method has its own indications, and only according to the analysis of the patient’s chin morphology before the operation, can we get the best surgical results by selecting the appropriate surgical method. Silicone gel chin augmentation Silicone gel chin augmentation can not increase the vertical length of the chin, otherwise it will lead to the lower edge of the chin stepped deformity affecting aesthetics, so this surgical program is only suitable for mild and moderate small chin deformity. There are varying degrees of displacement of the prosthesis after chin augmentation with silicone gel prosthesis, the reasons may be: ① the prosthesis is not fixed exactly or the prosthesis is located in the superficial periosteum; ② the displacement of the prosthesis caused by repeated contraction of the chin muscle; ③ the prosthesis is not well adhered to the bone surface of the chin; ④ the peeling cavity is too large during the operation. At present, some operators use vertical incision of oral mucosa to reduce the stripping gap and the use of personalized prosthesis to increase the fit of prosthesis and bone surface, which can effectively reduce the incidence of silicone prosthesis displacement. Bone resorption in the chin is also a common complication of silicone gel chin augmentation, and all of the l0 patients we observed after silicone gel chin augmentation had bone resorption. Analysis of the causes may be: ① the placement of the prosthesis and the formation of the fiber capsule increases the pressure on the anterior part of the chin, long-term compression leads to local bone resorption; ② foreign body stimulation of silicone gel prosthesis caused bone resorption; ③ the placement of the prosthesis blocked the periosteum in the anterior part of the chin to the blood supply to bone; ④ local periosteum in the anterior part of the chin after the placement of the silicone gel is fibrotic and fused to the anterior wall of the prosthesis fibrous capsule, the loss of the osteogenic role of the osteoblasts in the periosteum, affecting bone formation and destruction. This affects the balance between bone formation and destruction. At present, some scholars advocate placing the prosthesis on the surface of periosteum to avoid bone resorption, but there is damage to the chin muscle, easy to bleed to form hematoma, damage to the facial nerve branches and other disadvantages. In addition, silicone gel chin augmentation also has complications such as aging of the prosthesis, rejection of silicone gel prosthesis foreign body, local pain sensation, abnormal sensation of the lower lip, and infection. Silicone gel implant chin augmentation is not suitable for chin-lip groove deepening small chin deformity, otherwise it will further deepen the chin-lip groove, not suitable for patients with small jaw deformity. 2, autologous bone graft chin augmentation because autologous bone graft chin augmentation is often completed at the same time with the jaw angle osteotomy. Make full use of the intercepted mandibular angle area bone after appropriate modification of the shape transplanted in the chin. The main complication after chin augmentation with autogenous bone grafting is bone resorption, especially around the bone resorption is obvious, but the bone resorption around the titanium nails used to fix the bone block is less serious, analyzing the reasons for this may be related to the following factors: (1) the bone resorption of the free implantation of the block of bone resorption before the establishment of the blood circulation is damaged; (2) the pressure of the chin muscle to promote the resorption of the local bone resorption. Autologous bone chin augmentation and silicone prosthesis chin augmentation can only be adjusted in the anterior-posterior direction of the shape of the chin, can not be vertically to extend the length of the chin, and is only suitable for small chin deformity of the chin-lip groove becomes shallow, coupled with the thickness of the autologous bone block can not be too large a limitation, so autologous bone chin augmentation is only suitable for mild small chin deformity. 3.Horizontal chin osteotomy chin contouring Horizontal chin osteotomy chin contouring can adjust the shape of chin in both sagittal and vertical directions, moving the osteotomy block forward can deepen the effect of chin-lip groove, moving the osteotomy block downward can produce the cosmetic effect of making the chin-lip groove shallower, and horizontal chin osteotomy chin contouring can also be adjusted through the rotation of osteotomy block and the horizontal shift of the chin deviation and facial asymmetric deformities, so this surgery is Therefore, this procedure is suitable for any type of small chin deformity and deviated jaw deformity. The bone spacing created by the postoperative movement of the block is completely filled by regenerated bone after 6 months. However, this method is difficult to perform, poses a risk of chin nerve injury, and requires special orthognathic surgical instruments, which limits its clinical use.