Evaluation of mandibular nerve injury using magnetoencephalography

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Clinically, quantitative measurement is required for sensory disturbance of tongue and lip due to mandibular nerve injury. We applied somatosensory evoked magnetic fields (SEFs) following tongue and lip stimulation in order to evaluate sensory dysfunction in patients with mandibular nerve injury. To evaluate tongue sensory abnormality, difference of tongue SEFs between affected- and unaffected- side stimulation can be an effective parameter. To indicate lip sensory disturbance, early component of lip SEFs can be an useful criterion. The present findings suggest that sensory disturbances in the tongue and lip associated with oral surgery can be detected objectively using magnetoencephalography.