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Mandibular border movements and masticatory patterns before and after orthognathic surgery.
The International Journal of Adult Orthodontics and Orthognathic Surgery
|January 1, 1992
Summary
Surgical-orthodontic treatment impacts jaw movement differently based on malocclusion type. Mandibular setback surgery for Class III malocclusions improved jaw movement range, while mandibular advancement for Class II malocclusions initially restricted it.
Area of Science:
- Orthodontics
- Oral and Maxillofacial Surgery
- Biomechanics
Background:
- Severe skeletal malocclusions often require combined surgical-orthodontic treatment.
- Understanding the functional adaptation post-surgery is crucial for treatment planning.
Purpose of the Study:
- To investigate the effects of mandibular setback and advancement surgeries on jaw movement.
- To compare functional adaptation in skeletal Class II and Class III malocclusions post-treatment.
Main Methods:
- Recorded functional and border jaw movements in 16 patients before and after surgery.
- Analyzed changes in movement range and patterns.
Main Results:
- Mandibular setback surgery (Class III) generally increased jaw movement range postoperatively.
- Mandibular advancement surgery (Class II) resulted in restricted jaw motion immediately after surgery, with incomplete recovery at 12 months.
Conclusions:
- Functional adaptation varies significantly between mandibular setback and advancement surgeries.
- Mandibular advancement surgery may lead to longer-term functional limitations in jaw movement compared to mandibular setback surgery.