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A classification of temporomandibular joint disk morphology
Oral Surgery, Oral Medicine, and Oral Pathology
|January 1, 1989
Summary
Temporomandibular joint disk morphology impacts function. A new classification identifies five shapes, linking specific shapes like
Area of Science:
- Temporomandibular joint (TMJ) disorders
- Biomechanical analysis of joint structures
Background:
- Disk morphology is crucial for temporomandibular joint (TMJ) internal derangements.
- Abnormal disk shapes are implicated in TMJ functional impediments.
Purpose of the Study:
- To classify temporomandibular joint disk shapes.
- To correlate disk morphology with the severity of internal derangements.
Main Methods:
- Utilized corrected lateral cephalometric arthrotomograms and histopathologic sagittal sections.
- Developed a classification system for five basic disk shapes: bow tie, straight, funnel, bulge, and Y.
- Performed statistical analyses to evaluate relationships between disk shape and joint condition.
Main Results:
- Normal condyle-disk-fossa relationships and mild displacements were associated with the 'bow tie' (normal) disk shape.
- Severe disk displacement without reduction predominantly occurred with the 'bulge' disk shape (shape 4).
- Anterior recess dye beaking indicated abnormal disk morphology and displacement.
Conclusions:
- Disk morphology is a significant indicator of temporomandibular joint internal derangements.
- Specific disk shapes correlate with the degree of displacement and functional impairment.
- The developed classification aids in understanding TMJ pathology.