The Clarification about Mechanism of Awake Bruxism using Neuroimaging Technique

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The aim of this project was to compare the cerebral activity between fists and tooth clenching in first study, and to investigate the role of periodontal afferent inputs on cerebral activation pattern evoked by masticatory muscle in second study. First study showed that bilateral light fist clenching significantly activated the bilateral sensorimotor cortex, while light teeth clenching was significantly associated with activation of bilateral sensorimotor cortex, supplementary motor area, dorsolateral prefrontal cortex, and posterior parietal cortex. Second study showed that there was no difference in cerebral activity between during sham tooth tapping and tooth tapping. Our findings suggest that the cerebral activity during tooth clenching has specific pattern in the central nerve system and the influence of periodontal afferent inputs and associated jaw muscle activity is relatively minor compared to the rhythmic jaw movements.