Maxillary protrusion deformity is mostly related to heredity, some of which appear in childhood and some in growth and development. In addition, patients with acromegaly caused by scar contracture, macroglossia and pituitary diseases after neck burns in childhood may also have secondary mandibular protrusion deformity. Patients with severe mandibular protrusion are often accompanied by dentofacial deformities. Only mandibular deformity with mental process can be divided into mental process, mental process and mental process. According to the degree of mandibular protrusion, the specific surgical method can be improved. In order to restore the mandibular protrusion to its normal position, it is usually necessary to remove the teeth in the operation area two weeks before operation. When correcting mandibular protrusion, the interdental mucosa, mucosa and periosteum should be cut horizontally from the gingival side at the bottom of buccal gingival sulcus from right to left, and the periosteum in oral cavity should be stripped to fully expose the osteotomy area. Attention should be paid not to damage the mental neurovascular bundle when peeling and pulling outward. Mark the osteotomy line and the width of the osteotomy to be retreated with methylene blue, cut off the front of the mandible along the osteotomy line, and finally make the protruding mandible completely retreat to the normal position. The correction of chin protrusion needs to be fixed with mini-plate screws or dental arch splint. In order to ensure a better plastic effect after operation, it is necessary to prevent infection, keep the mouth clean and use antibiotics reasonably after operation. /kloc-don't eat too hard and spicy food for 0/month. The most important thing is not to make your face shake or hit.