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Relationship between Kinematic Center and TMJ Anatomy and Function

Clinic for Masticatory Disorders, Removable Prosthodontics and Special Care, Center for Oral Medicine, Dental and Maxillo-Facial Surgery, University of Zürich, Plattenstrasse 11, CH-8032 Zürich, Switzerland

View larger version (29K): [in this window] [in a new window]   Figure 1. Variations of the minimum intra-articular distance and of the trace of the kinematic center. Example of the minimum intra-articular distance h and caudo-cranial position z of the kinematic center during one jaw-opening/-closing cycle plotted vs. time (A) and synchronously with the dorso-ventral position x of the kinematic center (B). t is the difference between the times th and tz corresponding to the maximum differences of h and z between the opening and closing traces. x is the difference between the x coordinates xh and xz corresponding to the maximum differences of h and z between the opening and closing traces. ICP, intercuspal position; MO, maximum opening.

View larger version (42K): [in this window] [in a new window]   Figure 2. Determination of the kinematic center. (A) An example of the cross-correlation lattice made to determine the kinematic center in the sagittal view. The trace of the kinematic center for opening/closing is shown in red, that for protrusion/retrusion in yellow. The cubes indicate the degree of cross-correlation between the opening/closing and the protrusion/retrusion traces. The trace of the point best approximating the fossa is shown in blue. (B) Trajectories of kinematic points (red), point best approximating the fossa (blue), and minimum intra-articular distance (green) in the sagittal view for 9 joints. Note the large differences among the 3 traces.

View larger version (59K): [in this window] [in a new window]   Figure 3. Relationship of the kinematic center with the main condylar axis and with the point best approximating the fossa shape. In both drawings, the main condylar axes have been re-aligned, and the dorso-ventral coordinate x runs from left to right, whereas the caudocranial coordinate z runs from bottom to top. (A) Position of the kinematic centers of all joints studied relative to the main condylar axis (grey rod): different colors for the different quadrants. (B) Points best approximating the fossa shape (dark/blue) connected to the corresponding kinematic centers (white) and relative to the main condylar axis in all joints studied.

Journal of Dental Research, Vol. 87, No. 8, 726-730 (2008)
DOI: 10.1177/154405910808700810


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