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  • Title: Experimental low-level jaw clenching inhibits temporal summation evoked by electrical stimulation in healthy human volunteers.
    Author: Tada H, Torisu T, Tanaka M, Murata H, De Laat A, Svensson P.
    Journal: Arch Oral Biol; 2015 May; 60(5):681-9. PubMed ID: 25757146.
    Abstract:
    OBJECTIVE: To examine the effect of low-level jaw clenching on temporal summation in healthy volunteers. DESIGN: In 18 healthy volunteers, the pain intensities evoked at the masseter muscle and the hand palm by the first and last stimuli in a train of repeated electrical stimuli (0.3 or 2.0 Hz) were rated using 0-100mm visual analogue scales (VAS), in order to evaluate temporal summation before and after three types of jaw-muscle tasks: low-level jaw clenching, repetitive gum chewing and mandibular rest position. A set of concentric surface electrodes with different diameters (small and large) was used for the electrical stimulation. RESULTS: The temporal summation evoked by the large diameter electrode with 2.0 Hz stimulation decreased significantly both on the masseter and the hand after low-level clenching (P ≤ 0.03), but did not show any significant change after the other tasks (P > 0.23). The VAS score of the first stimulation did not show any significant changes after low-level clenching (P > 0.57). CONCLUSIONS: Experimental low-level jaw clenching can inhibit pain sensitivity, especially temporal summation. Low-level jaw clenching can modify pain sensitivity, most likely through the central nervous system. The findings suggest that potential harmful low-level jaw clenching or tooth contacting could continue despite painful symptoms, e.g., temporomandibular disorders.
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