Effect of mandibular displacement on brain activity

DOI IR
  • Sakuraba Hiroyuki
    Department of Prosthodontics and Oral Implantology, School of Dentistry, Iwate Medical University
  • Kobayashi Takuya
    Department of Prosthodontics and Oral Implantology, School of Dentistry, Iwate Medical University

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  • 下顎の偏位が脳機能応答に及ぼす影響
  • — functional MRIを用いた検討 —
  • — A Functional Magnetic Resonance Imaging Study —

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It is reported that mandibular displacement causes various problems. However, mechanisms of those relationships haven't been revealed. In order to reveal the influence of mandibular displacement on brain activity, we examined brain activity using fMRI during tapping and clenching movements. Ten healthy subjects performed tapping and clenching in an intercuspal position (Control) and in horizontal mandibular displacement conditions (Front, Left, Right). The entromedial prefrontal cortex (VMPFC) and amygdala were not activated in control condition during tapping and clenching. The amygdala was activated during tapping with horizontal mandibular displacements. The extent of activation in the amygdala during tapping with the horizontal mandibular displacements was significantly higher than those in the control group. During clenching, the VMPFC and amygdala were activated in horizontal mandibular displacement conditions and the extents of activation were significantly higher in the horizontal mandibular displacements than those in control condition. Those results suggest that horizontal mandibular displacements may cause discomfort and pain regardless of direction and kinds of movement. Those results suggest that the clenching accompanied with severe mandibular displacement or malocclusion could cause stronger stress responses.

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