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Disc movements over the condylar head. Radiographical study on autopsy materials
M Meunissier1, A Meunier, P Carpentier
1Faculté de Médecine Lariboisière-Saint-Louis, CNRS au Laboratoire de Recherche Orthopédique, Paris, France.
Journal of Oral Rehabilitation
|September 1, 1993
Summary
This study analyzed temporomandibular joint disc movement during jaw opening. Findings show a 5% width reduction and significant translation between the disc and condyle in the lower compartment.
Area of Science:
- Temporomandibular Joint (TMJ) biomechanics
- Radiographic analysis of craniofacial structures
Background:
- Understanding the dynamic behavior of the temporomandibular joint (TMJ) disc is crucial for diagnosing and treating related disorders.
- Previous studies have utilized various methods to assess disc-condyle interactions, but precise measurement of posterior band movement during function remains an area of interest.
Purpose of the Study:
- To radiographically evaluate the positional changes of the disc posterior band relative to the condylar head during mandibular opening.
- To quantify the linear path and displacement of disc landmarks during jaw excursion.
Main Methods:
- A radiographic study was conducted on six embalmed human subjects.
- Micro stainless steel balls were affixed as landmarks to the bone and the disc for precise X-ray identification.
- Data was processed across different phases of mandibular movement in selected planes to calculate landmark coordinates and path lengths.
Main Results:
- A 5% reduction in disc width was observed during the mandibular opening movement.
- Significant translational movement between the disc and the condyle was detected within the lower compartment of the TMJ.
Conclusions:
- The study demonstrates measurable changes in disc morphology and position during jaw opening.
- The findings strongly suggest substantial translation occurs between the articular disc and the condyle in the lower joint compartment, contributing to normal jaw function.