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Mandibular range of motion with rigid/nonrigid fixation
Oral Surgery, Oral Medicine, and Oral Pathology
|April 1, 1987
Summary
Rigid fixation after orthognathic surgery improves maximum interincisal opening (MIO) compared to nonrigid fixation. Early function and physiotherapy significantly enhance MIO recovery post-surgery.
Area of Science:
- Oral and Maxillofacial Surgery
- Orthodontics
- Reconstructive Surgery
Background:
- Decreased mandibular range of motion is a known complication following orthognathic surgery.
- Previous treatments involved wire osteosynthesis and prolonged maxillomandibular fixation (MMF).
Purpose of the Study:
- To evaluate the impact of fixation type on maximum interincisal opening (MIO) after bilateral sagittal ramus osteotomy (BSRO) and LeFort I osteotomy.
- To compare outcomes between rigid fixation with early function and nonrigid fixation with MMF.
Main Methods:
- 49 subjects undergoing BSRO with advancement or combined BSRO and LeFort I osteotomy were analyzed.
- Patients were divided into rigid fixation (early function, physiotherapy) and nonrigid fixation (wire osteosynthesis, 6-week MMF, no physiotherapy) groups.
Main Results:
- Rigid fixation groups showed minimal MIO decrease (3.3-3.5 mm, 6.6-6.9%).
- Nonrigid fixation groups experienced significant MIO decrease (13.9-16.8 mm, 26.1-29.6%).
Conclusions:
- Rigid fixation combined with early function and physiotherapy leads to significantly better postoperative MIO.
- This approach mitigates the range of motion deficits commonly seen with nonrigid fixation methods.