Ipsilateral interferences and working-side condylar movements.
There is limited knowledge of the effects of the occlusion on temporomandibular joint function.


OBJECTIVE
The aim was to investigate the influence of a working-side occlusal alteration (OA, i.e. interference) on trajectories of working-side condylar points during standardized lateral jaw movements (laterotrusion) tracked by a jaw-tracking system.


METHODS
Ten trials of right laterotrusion were repeated under: control 1 (before OA), OA (immediately after placement of a working-side interference) and control 2 (immediately after removal of OA) conditions.


RESULTS
During right jaw movement, the paths of the working-side condylar points under OA were significantly more inferior and anterior to those under control at the same amount of mid-incisor-point displacement from the intercuspal position. The OA significantly reduced the rotation of the mandible about the antero-posterior and supero-inferior axes and significantly increased the opening angle. Controls 1 and 2 were not significantly different.


CONCLUSIONS
A working-side interference has an immediate, significant effect on working-side condylar movement.
Huang
B-Y
BY
Jaw Function and Orofacial Pain Research Unit, Faculty of Dentistry, University of Sydney, Level 3, Professorial Unit, Westmead Centre for Oral Health, Westmead, NSW 2145, Australia.
Whittle
T
T
Peck
C C
CC
Murray
G M
GM
D000328:Adult; D003766:Dental Occlusion; D006801:Humans; D007568:Jaw / Q000502:physiology; D007574:Jaw Relation Record; D008335:Mandibular Condyle / Q000502:physiology*; D009068:Movement / Q000502:physiology*; D012399:Rotation; D013704:Temporomandibular Joint / Q000502:physiology