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Dynamic Intra-articular Space Variation in Clicking TMJs

Clinic for Masticatory Disorders and Complete Dentures, Center for Oral Medicine, Dental and Maxillo-Facial Surgery, University of Zürich, Plattenstrasse 11, CH-8028 Zürich, Switzerland;

View larger version (41K): [in this window] [in a new window]   Figure 1. Analysis of the stress-field paths. An example of the stress-field paths is shown for clicking TMJ #03 in an oblique craniocaudal (A) and oblique sagittal view (B). Compressive stresses are distributed over an area the mean radius of which is marked a (A). The minimum condyle-fossa distance at the centroid of the stress-field is represented by h (B). The position of the centroid of the stress-field depends on the congruency of the articulating surfaces and on their instantaneous spatial relationship. The cone tips indicate the instantaneous position of the stress-field centroid. The stress-field paths differed strongly between jaw opening and closing, moving in the medial joint portion during opening and in the lateral joint portion during closing. For quantitative analysis, the stress-field path was divided into segments by planes parallel to the oblique-coronal YZ plane, set at distances of 1 mm between each other. For every segment resulting from the intersection of two planes with the stress-field path, the spread s was the maximal deviation in mm of the values of the Y-coordinates.

View larger version (47K): [in this window] [in a new window]   Figure 2. Example of stress-field paths in a clicking TMJ and in a control. Stress-field paths in a clicking joint (TMJ #11) that differed between jaw opening and closing (A). Stress-field paths in an asymptomatic joint (TMJ #19) that were almost perfectly coincident between jaw opening and closing (B). The cone tips indicate the instantaneous position of the stress-field centroid.

Journal of Dental Research, Vol. 83, No. 6, 480-484 (2004)
DOI: 10.1177/154405910408300609


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