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A Postoperative Evaluation Guideline for Computer-Assisted Reconstruction of the Mandible
Published on: January 28, 2020
Skeletal stability following maxillary impaction and mandibular advancement
P Arpornmaeklong1, J M Shand, A A Heggie
1Department of Oral and Maxillofacial Surgery, School of Dental Science, University of Melbourne, Melbourne, Australia.
International Journal of Oral and Maxillofacial Surgery
|September 1, 2004
Summary
This study on bimaxillary surgery for skeletal Class II malocclusion found most patients achieved stable results. However, some female patients with high mandibular plane angles experienced significant mandibular relapse.
Area of Science:
- Orthodontics and Maxillofacial Surgery
- Skeletal Malocclusion Correction
- Surgical Stability Evaluation
Background:
- Skeletal Class II malocclusion often requires surgical correction.
- Combined Le Fort I maxillary impaction and mandibular advancement is a common surgical approach.
- Evaluating the long-term stability of such complex bimaxillary procedures is crucial.
Purpose of the Study:
- To retrospectively assess the skeletal stability of combined Le Fort I maxillary impaction and mandibular advancement.
- To identify factors influencing stability in patients with skeletal Class II malocclusion.
- To evaluate cephalometric changes and relapse patterns after bimaxillary surgery.
Main Methods:
- Retrospective analysis of 29 patients undergoing bimaxillary surgery.
- Rigid internal fixation used for surgical stabilization.
- Standardized cephalometric analysis of serial lateral radiographs with a minimum 12-month follow-up.
Main Results:
- The maxilla showed minor, non-significant anterior and inferior displacement.
- Significant superior repositioning of the gonion was observed.
- Significant mandibular relapse occurred in 5 female patients with high mandibular plane angles and large advancements (>10 mm).
Conclusions:
- Bimaxillary surgery for skeletal Class II malocclusion generally yields stable outcomes.
- A subset of patients, particularly females with specific facial morphologies, may experience mandibular relapse due to condylar changes.
- Careful patient selection and monitoring are important for optimizing surgical outcomes.
