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Mandibular mobility and occlusal relationships after orthognathic surgery
1Department of Clinical Dental Sciences, School of Dentistry, University of Liverpool, England.
The International Journal of Adult Orthodontics and Orthognathic Surgery
|January 1, 1997
Summary
Orthognathic surgery outcomes vary by procedure. Le Fort I osteotomy improved mandibular mobility, while other procedures showed different occlusal interference patterns, impacting jaw function post-surgery.
Area of Science:
- Oral and Maxillofacial Surgery
- Orthodontics
- Biomechanical Engineering
Background:
- Orthognathic surgery corrects skeletal discrepancies.
- Maxillomandibular fixation (MMF) is a traditional post-surgical stabilization method.
- Assessing outcomes without MMF is crucial for patient function.
Purpose of the Study:
- To evaluate mandibular mobility and occlusal interferences after orthognathic surgery without MMF.
- To compare different surgical techniques regarding functional outcomes.
Main Methods:
- Retrospective analysis of 42 patients.
- Categorization of surgical procedures: Le Fort I, mandibular advancement, bimaxillary advancement, mandibular setback, and combined maxillary advancement/mandibular setback.
- Assessment of mandibular mobility and occlusal contacts at least 3 months post-surgery.
Main Results:
- Le Fort I osteotomy showed significantly higher mean maximum protrusion and lateral excursions.
- Mandibular advancement and bimaxillary advancement resulted in greater end-of-treatment overjet.
- Increased right lateral non-working-side contacts were noted in mandibular setback and combined procedures.
- Severe interference between retruded contact position and intercuspal position was unique to the mandibular setback group.
Conclusions:
- Surgical technique significantly influences post-orthognathic surgery mandibular mobility and occlusal interference patterns.
- Le Fort I osteotomy appears to offer better mandibular mobility.
- Specific procedures carry higher risks of occlusal interferences, necessitating careful treatment planning.