Response of human jaw muscles to axial stimulation of a molar tooth

Experimental Brain Research
Russell S A BrinkworthK S Türker

Abstract

The reflexes of the main jaw-closer muscles (masseter and anterior temporalis) on both sides of the jaw were investigated using surface electromyography to observe reflex activity following mechanical stimulation of the 1st right upper-molar tooth at various forces under a number of levels of jaw-muscle activity. As with analogous studies performed on the incisor, three distinct reflex events were identified in the EMG before the earliest conscious subject reaction: early excitation, inhibition and late excitation. However, contrary to observations found during studies on the incisor, excitation, not inhibition was the primary reflex response. The application of a local anaesthetic block around the stimulated molar showed that the primary agents in eliciting the observed reflexes were not contained within the periodontium of the stimulated tooth. A diminished representation of periodontal mechanoreceptors around the molar teeth and more elaborate root structures, hence a more solid connection to the jaw and consequently less tooth movement, were deemed the likely reason for the distinction between the reflex responses of the incisal and molar regions. In addition to the reflex studies, the minimum reaction time of a number of s...Continue Reading

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Citations

Nov 20, 2004·Experimental Brain Research·Russell S A Brinkworth, Kemal S Türker
May 24, 2007·Journal of Oral Rehabilitation·S Armijo-OlivoC Flores-Mir
May 4, 2005·Experimental Brain Research·Russell S A Brinkworth, Kemal S Türker
May 30, 2009·Journal of Applied Physiology·Yoshiyuki OkadaHiroshi Nose

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