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Orthognathic surgery effects on temporomandibular joint compressive stresses
Taylor E Glovsky1, Laura R Iwasaki2, Ying Wu2
1School of Dentistry, Oregon Health and Science University, 97201, Oregon, Portland, 2730 S Moody Ave., USA.
Orthodontics & Craniofacial Research
|March 31, 2023
Summary
Orthognathic surgery impacts temporomandibular joint (TMJ) stresses, with changes influenced by sex and surgical alterations. These procedures modify jaw muscle forces, affecting TMJ loads and compressive stresses post-operation.
Area of Science:
- Orthodontics and Maxillofacial Surgery
- Biomechanics
- Temporomandibular Joint Disorders
Background:
- Orthognathic surgery aims to correct jaw discrepancies.
- Understanding its effects on the temporomandibular joint (TMJ) is crucial for patient outcomes.
- This study investigates TMJ compressive stresses following surgical intervention.
Purpose of the Study:
- To analyze the impact of orthognathic surgery on TMJ compressive stresses.
- To identify factors influencing these stress changes, including surgical modifications and patient characteristics.
- To correlate changes in jaw muscle forces with alterations in TMJ loading.
Main Methods:
- Utilized cone-beam computed tomography (CBCT) scans pre- and post-surgery (T1 and T2).
- Measured changes in mandibular position and occlusal plane angle (FH-OP).
- Employed numerical modeling to estimate TMJ forces, loading areas, and jaw muscle forces during biting, analyzing stress variations (MPa).
Main Results:
- Condylar loading areas were smaller in females compared to males.
- Post-surgery TMJ compressive stresses varied significantly based on surgical changes, biting angle, and sex.
- Mandibular setbacks, particularly with decreased FH-OP angle in females, showed the largest increases in TMJ compressive stresses.
Conclusions:
- TMJ compressive stresses after orthognathic surgery are influenced by mandibular repositioning, occlusal plane changes, biting angle, and sex.
- Surgical interventions alter jaw muscle activation patterns, consequently affecting TMJ loads and resulting compressive stresses.
