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[Chronic trismus in the severe skeletal Class III cases]
Nihon Ago Kansetsu Gakkai Zasshi
|January 1, 1989
Summary
This study reveals characteristic limitations in mandibular head movement for patients with chronic trismus, often linked to specific occlusal contact points in the posterior jaw area.
Area of Science:
- Orthodontics and Maxillofacial Surgery
- Dental Biomechanics
- Temporomandibular Joint (TMJ) Disorders
Context:
- Severe skeletal Class III malocclusion often requires surgical intervention.
- Chronic trismus, characterized by limited jaw opening, presents unique challenges.
- Understanding mandibular head movement patterns is crucial for treatment planning.
Purpose:
- To classify and analyze mandibular head movement types in patients with severe skeletal Class III malocclusion and chronic trismus.
- To investigate the relationship between mandibular head movement patterns and occlusal contacts.
- To identify characteristic limitations in jaw mobility and stress points in occlusion.
Summary:
- Fifty-one patients with severe skeletal Class III malocclusion underwent classification based on mandibular head movement (Types A, B, C) during maximum mouth opening, resulting in five combined types (AA, AB, BB, BC, CC).
- Sixty-five percent of patients presented with chronic trismus, predominantly female (73%), with no subjective joint symptoms.
- Type AA and AB showed fewer posterior occlusal contacts, while Type CC consistently exhibited contacts with the antagonist tooth 5.
Impact:
- This research highlights specific patterns of mandibular dysfunction in chronic trismus patients.
- Findings suggest that occlusal analysis, particularly posterior contact points, is vital for managing trismus in this population.
- The classification system provides a framework for understanding TMJ biomechanics in relation to skeletal malocclusion and jaw movement limitations.