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Journal of Dental Research
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Biomechanics of the Human Temporomandibular Joint during Chewing

M. Naeije* and N. Hofman

Department of Oral Function, Section of Oral Kinesiology, Academic Center Dentistry Amsterdam (ACTA), Louwesweg 1, 1066 EA, Amsterdam, The Netherlands;


Figure 1
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  		Figure 1. The superimposed sagittal movement traces of the condylar kinematic center of one of the subjects. The free-closing kinematic center movement traces were situated below the opening traces (A). However, compression in the joint during closing, as the result of a manually applied counteracting force on the chin, shifted the closing movement traces upward and made them coincide with the opening traces (B). Opening traces are gray, closing traces black.

 

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  		Figure 2. The superimposed sagittal movement traces of the kinematic centers of the left and right joints, and the superimposed frontal movement traces of the lower incisal point of two participants chewing on the right (A) and left sides (B), respectively. For both participants, the contralateral condylar traces were longer and showed a coincident movement pattern. The movement traces on the ipsilateral side showed a non-coincident movement pattern for one participant (A), while for the other participant (B), the joint compression close to the intercuspal position shifted the closing traces so far upward that they were situated even slightly above the opening traces (scored as "coincident pattern"; see also DISCUSSION). The opening traces are gray, closing traces are black.

 

Journal of Dental Research, Vol. 82, No. 7, 528-531 (2003)
DOI: 10.1177/154405910308200708
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