実験的こう合干渉付与による情動反応の脳電位分布とＤｉｐｏｌｅの推定

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  • Location of Electric Current Sources with Activation of Experimental Occlusal Interference in the Human Brain by Dipole Tracing Method

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Purpose: The aim of this study was to clarify the effect of an experimental occlusal interference on the brain function by the dipole tracing method.<BR>Methods: Seven patients with healthy dentate were selected. Electromyograms (EMG) from the masseter and posterior temporal muscles and electroencephalograms (EEG) were simultaneously recorded and analyzed before and after clenching. The location of electric current sources was estimated by the dipole tracing method. In addition, evaluation by visual analogue scale (VAS) questionnaires consisting of five comfort parameters was also done. Four-session experiments-the control (Cont), just after and 2 days later after wearing the interference (JAR and 2 DL), and after removing the interference (AR)-were carried out.<BR>Results: On JAR and 2 DL, VAS values increased and masticatory muscle activity decreased significantly, and both of them recovered by removing the interference.After clenching, %α in EEG decreased, and %α significantly increased compared with the control. Based on these findings, the sources of dipole were estimated in near amygdala, hippocampus, and thalamanus on JAR and 2 DL. The sources estimated in near amygdala disappeared on AR.<BR>Conclusions: The experimental occlusal interference affected sensory evaluation, masticatory muscles, and EEGs and the localization of the dipoles estimated. It is suggested that the source of dipole localization had caused the emotional change.

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