| Budget Amount *help |
¥3,400,000 (Direct Cost: ¥3,400,000)
Fiscal Year 1998: ¥1,500,000 (Direct Cost: ¥1,500,000)
Fiscal Year 1997: ¥1,900,000 (Direct Cost: ¥1,900,000)
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| Research Abstract |
The modulation of movement related cortical potentials of temporomandibular disorders (TMD) and its patho-functional relationship were investigated in this study. The subjects were healthy controls and TMJ clicking disorders (TMJ-Click). Jaw opening movement was used as task performance, and examination of pathological feedback from TMJ clicking was conducted with EEG and MEG diagnostic systems, and the following results were obtamed
1) Healthy subjects showed increased readiness potential according to the increase of jaw openig volume. 2)TMJ-Click showed the dedaralion of jaw opening readiness potentials during large jaw qenings. 3) Healthy subjects showed no relationships among readiness potentials, inandilmiar jaw movement and muscle activities. 4) 'IMJ-Click showed a negative correlation between readiness potentials and muscle activities. 5) Healthy subjects showed the bilateral appearance of readiness fields accmpanying jaw movements, opening, c1osing, and lateral direction. 6) In the motor fields, jaw opening showed bilateral appearance of MF, while lateral jaw movements showed the predcmninance of MF in the contralateral sensorimotor cortical area to the movement side. 7) Healthy subjects showed the bilateral appearance of movement evoked fields (MEF) accompanying jaw opening and lateral movements. 8) TMJ-Click showed the modulation of MF in accordance with difficulty of jaw movement, such as restriction of the lateral jaw movement area caused by TMJ clicking. 9) TMJ-Click showed the decrease of MEF compared from that of healthy subjects.
In this study, patho-functional relationships were clarifled between sensorimotor cortical activity and peripheral pathological feedback from TMJ clicking, and the findinga indicated that the feedback sensation of TMD_S affects the modulation of cortical activities.
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