1. What is “anti-jaw” malocclusion. Under normal circumstances, when children’s upper and lower teeth bite together, the upper teeth should bite in front of the lower teeth, if the opposite, that is, the lower teeth bite in front of the upper teeth, is the medical “anterior teeth anti-jaw”, “anti-jaw” malformation, commonly known as “ground If the lower teeth bite in front of the upper teeth, this is the medical “anterior teeth rejig”, “antimandibular” malformation, commonly known as “diastema”, “pocket teeth”, etc. The antimandibular deformity can be simply manifested as the anterior teeth (incisors, incisors) retrusion, while the posterior teeth (molars) relationship is normal, no obvious abnormalities in facial appearance. In severe cases, in addition to the anterior teeth, the bite relationship of the posterior teeth is also misshapen, and there are deformities such as underdevelopment of the middle of the face and jaw protrusion. 2, the causes of “anti-jaw” deformity. The causes of anti-jaw include bad breastfeeding posture, bad oral habits, local abnormalities of individual teeth, tonsillar disorders, etc. Genetics, congenital malformation, trauma and cleft lip and palate repair surgery are also common causes. 3.The damage of “anti-jaw” deformity to children. Anti-jaw has a great impact on the jaw development of children. Anti-jaw stimulates the rapid development and growth of the lower jaw due to occlusal force, resulting in bony anti-jaw. At the same time the development of the upper jaw is restricted, which amplifies this incongruity between the upper and lower jaws, resulting in orthodontic difficulties or the need for jaw surgery. In addition, the antimandibular jaw causes compensatory changes in the axial direction of the teeth, with the lower teeth tilting inward in the long axis. What’s more, “anti-jaw” deformity also causes great damage to the psychological development of the child. 4.Traditional treatment of “antimandibular” malocclusion. The antimandibular must be removed early and corrected early to stop the further development of the deformity. For patients with mild or normal maxillae, various orthodontic appliances, intermaxillary traction or orthodontic treatment can be applied. For more severe antimandibular deformities, treatment with osteotomy or post-osteotomy traction of the maxilla and/or mandible is mostly required. However, traditional surgical methods have the following drawbacks: 1. long operation time, high bleeding, high surgical risk and high cost. 2. Treatment can only be performed on adult patients. 3. The chance of recurrence after surgery is high. 4, the current maxillary osteotomy is mostly LeFort type I osteotomy, this osteotomy is only forward displacement of the lower part of the maxilla, after surgery, the lower part of the patient’s face protrusion, facial shape is not coordinated, affecting the aesthetics. The LeFort II and III osteotomy with overall forward displacement of the maxilla is technically demanding and risky. 5, children with severe “anti-jaw” deformity treatment methods. Traditional maxillary and/or mandibular osteotomy or post-osteotomy traction method is only applicable to adult patients. Severe “antimandibular” deformity in children can be corrected by “trans-septal distraction osteogenesis”. 6. “Trans-seam traction osteogenesis” and its advantages. “Trans-septal traction osteogenesis” refers to the biological process of using external force to tract the growing bone seam, induce new bone formation in the seam area, remodel the bone seam, change the position of the bone and lengthen the associated soft tissue. The maxilla is connected to the surrounding facial bones mainly through the sutures, and external traction on the maxillary sutures can promote the growth and advancement of the maxilla to correct the antimandibular deformity. Compared with traditional surgical methods, the “trans-suture traction osteogenesis technique” has the following advantages: 1. 2. It is suitable for adolescent and pre-pubescent children. It conforms to the principle of early correction, blocks the further development of deformity, and is conducive to the psychological health development of the child. 3.The postoperative effect is stable. The chance of recurrence is small. 4.The whole middle of the face is shifted forward, and the facial appearance is coordinated and beautiful. 7.The age of “trans-suture traction osteogenesis” is applicable. The “trans-septal traction osteogenesis” technique is suitable for patients between the ages of 6 and 16. Some patients beyond this age range may also benefit from this method. Since 2005, we have treated 52 children with cleft lip and palate postoperative anterior retrusion and midface hypoplasia with the “trans-septal distraction osteogenesis technique” and have accumulated rich clinical experience. All the children were treated smoothly, with good orthodontic results and a small recurrence rate at long-term postoperative follow-up. In addition, early orthodontic treatment interrupted the further development of the malformation and promoted the psychological development of the children. 8, adult “anti-jaw” deformity patients treatment methods. Most adult patients have good posterior teeth (molars, big teeth) relationship, and the deformity is mainly located in the front teeth (incisors, tigers, etc.). These patients can be treated with the “maxillary anterior osteotomy post retraction” method. At present, we have treated nearly 20 adult patients with good clinical results by applying the “maxillary anterior osteotomy and traction” method. A relatively small number of adult patients also have posterior teeth deformity, and these patients should be treated by traditional orthognathic surgery or post-osteotomy traction method. 9. “Maxillary anterior osteotomy with traction” and its advantages. The “maxillary anterior osteotomy followed by traction” means that only the anterior part of the maxillary deformity is operated on, and then the deformity is corrected by traction. The surgery does not involve the posterior part of the teeth, which is not deformed. In contrast, the traditional treatment method mainly refers to the LeFort type of osteotomy, which includes all the teeth, including some posterior teeth without deformity. Advantages: 1.Small surgery, short time. 2. Less damage and safe. The surgery is limited to the anterior part, away from the important blood vessels and nerves behind the maxilla. 3. Reasonable design of the method. Only the anterior part with deformity is corrected, and the posterior teeth with good occlusal relationship are not damaged. 4.It has almost no effect on the palatopharyngeal closure. After traditional surgical treatment, there is damage to the palatopharyngeal closure, and the accuracy of the patient’s speech is reduced after surgery. The “maxillary anterior osteotomy followed by traction” has almost no effect on pronunciation. In addition, we apply the three-dimensional adjustable traction method, which can correct the deformity of the patient in several directions during the traction process, and can also correct the deformity of asymmetry on both sides.