Abstract
The purpose of this study was to examine dentofacial changes treated by orthognathic surgery, and to clarify morphological factors affecting the stability of postoperative occlusion.Seven adult patients treated by surgical orthodontics using symmetrical mandibular advancement with the Obwegeser sagittal osteotomy, were selected for this study. Lateral cephalograms taken at five stages: pre-treatment, immediately before and after surgery, at the beginning of retention, and under retention (more than one year after retention began), were used for quantitative evaluation of dentofacial changes.Changes in dental and skeletal components, and anterior occlusion at each period, were analyzed in the anteroposterior and vertical dimensions, respectively.The following results were obtained:1. During the preoperative orthodontic treatment period, a remarkable correction of the malpositioned maxillary and mandibular incisors, associated with a little mandibular displacement, contributed to the change in the anterior occlusion.2. Before and after surgery, marked improvement in anterior occlusion was completed by the surgical mandibular advancement. In some cases, positional changes in the maxillary and mandibular incisors were found in both the anteroposterior and vertical dimensions, leading to a skeletal relapse of the mandible.3. During the postoperative orthodontic treatment period, a tendency of skeletal relapse was found. However, the anterior occlusion was generally stable because of compensatory changes in the dental components by the postoperative orthodontic treatment.4. During the retention period, a notable deterioration in the anterior occlusion was found in a case presenting condylar resorption. Except for this case, the overjet was stable due to the compensatory changes in the dental components for the skeletal relapse, while the overbite was unstable because of the dental relapse.The postsurgical stability of the anterior occlusion could be affected by the dentoskeletal relapse due to the amount of advancement, inadequate postoperative position of the condyle, fixation technique, and condylar resorption.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
