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J Neurophysiol 84: 1088-1092, 2000;
0022-3077/00 $5.00
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The Journal of Neurophysiology Vol. 84 No. 2 August 2000, pp. 1088-1092
Copyright ©2000 by the American Physiological Society

Reflex Responses Induced by Tooth Unloading

Kemal S. Türker and Melissa Jenkins

Department of Physiology, The University of Adelaide, South Australia 5005, Australia

Türker, Kemal S. and Melissa Jenkins. Reflex Responses Induced by Tooth Unloading. J. Neurophysiol. 84: 1088-1092, 2000. The reflex response of the masseter muscle to the rapid unloading of a single maxillary incisor tooth was studied. Unloading of a static force of 2 N in the horizontal direction resulted in a short-latency excitation, inhibition, and long-latency excitation of masseter muscle activity occurring at latencies of approximately 13, 20, and 40 ms, respectively, with a corresponding change in bite force occurring slightly later in each case. Following the blocking of periodontal input by the injection of local anesthetic around the stimulated tooth, inhibitory responses were abolished. Therefore, it is concluded that the observed masseteric inhibition was caused by the unloading of periodontal mechanoreceptors and thus that these receptors may contribute to the jaw unloading reflex.




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