Objective To investigate the orthodontic retention and adjustment of the occlusion after orthognathic surgery. Methods 18 patients were divided into three groups. Group Ⅰ : Cases with skeletal Class Ⅰ bimaxillary protrusion treated by subapical osteotomy; Group Ⅱ : Cases with skeletal Class Ⅱ mandibular retrusion treated by sagittal split mandibular advancement surgery; Group Ⅲ: Cases with skeletal Class Ⅲ treated by Le Fort Ⅰ osteotomy on maxilla and sagittal split osteotomy on mandible. There were 6 patients in each group. Three kinds of orthodontic elastic tractions were used based on different categories of malocclusion and different types of operation. Results 18 patients attained functional occlusion after the orthodontic occlusion adjustment. There was no relapse and malocclusion by surgery. Conclusion Intermaxillary elastics based on different categories of occlusion and different kinds of surgery can improve the occlusion after orthognathic surgery and attatin the functional occlusion.
