抄録
Mouth opening was necessary for dental treatment, but the wide mouth opening for a long time caused some troubles, for example, muscles pain, temporomandibular joint (TMJ) pain and changes of mandibular position. This time, the mental effects were observed by the opening mouth from the electroencephalographic (EEG) topography. As a result, there was significance while opening the mouth and just after closing the mouth on the β wave.
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