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Association between the Temporomandibular Joint Morphology and Chewing Pattern.
Sasin Sritara1,2, Yoshiro Matsumoto1, Yixin Lou1
1Department of Orthodontic Science, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University (TMDU), Tokyo 113-8510, Japan.
Diagnostics (Basel, Switzerland)
|July 14, 2023
Summary
Temporomandibular joint (TMJ) condyle shape is linked to chewing patterns. Rounded condyles are associated with non-bilateral grinding, while flatter condyles correlate with bilateral grinding in individuals.
Area of Science:
- Dentistry
- Orthodontics
- Biomechanics
Background:
- The temporomandibular joint (TMJ) is crucial for mastication.
- Understanding TMJ morphology's relation to function is vital for diagnosing and treating temporomandibular disorders (TMD).
- Chewing patterns can influence joint adaptation and morphology.
Purpose of the Study:
- To investigate the association between temporomandibular joint (TMJ) morphology and chewing patterns.
- To determine if TMJ shape is influenced by factors like skeletal morphology, sex, age, and temporomandibular disorder (TMD) symptoms.
- To identify specific TMJ measurements related to different chewing strategies.
Main Methods:
- Cross-sectional observational study of 102 TMJs from 80 patients (16-40 years).
- Utilized cone-beam computed tomography (CBCT), mandibular kinesiography, cephalometric radiographs, and questionnaires.
- Linear regression analyses were performed to correlate TMJ measurements with chewing patterns, adjusting for covariates.
Main Results:
- Condyle morphology, specifically the horizontal short axis length and radius, significantly correlated with frontal plane chewing patterns on the working side (p < 0.05).
- "Non-bilateral grinding" chewing was associated with a more rounded mandibular condyle shape.
- "Bilateral grinding" chewing was associated with a flatter anteroposterior condyle shape.
Conclusions:
- Mandibular condyle morphology appears to be related to masticatory function and specific chewing patterns.
- These findings suggest a potential link between skeletal morphology, chewing habits, and TMJ form.
- Further research can explore the implications for TMD diagnosis and treatment strategies.
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