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KMID : 0355219960210020293
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Journal of Korean Academy Oral Medicine
1996 Volume.21 No. 2 p.293 ~ p.304
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A Study on the Electromyographic Activity of Masticatory Muscles, Muscle Tenderness and Occlusal Contacts
in Patients with Temporomandibular Disorders
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Abstract
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The purpose of this study was to investigate the peak electromyographic activity(EMG) and time intervals in firim sequence of Anterior temporalis(TA) and Masseter(MM) on clenching, the number of tender points in the head and neck muscles, the occlusal contact state on clenching, and their relationship. 78 patients with Temporomandibuler.=;._. Disorders(TMDs) participated and were classified into articular or muscular group by clinical signs and syrnptonm
Biof?MG® of integrated masticatoryy function analyzer, Biopak® system(Bioresearch.lnc., USA), *was used measure EMG and related items, and T-Scan®(Tekscan, USA), computerized occlusal analyzer, was used to re=d ""
ocdusal contact state on maximum voluntary clerx;hing. EMG and occlusal contact- were synchronously reed analyzed with SAS statistical program
The results of this study were as follows:
1. In total subjects, EMG of TA was lower than that of MM in articular group but in muscular group, vice versa As a result, the ratio of TA to MM was significantly different between the two groups. no significant differenee.
3. The number and force of occlnsal contact were more in articular group, but there was no significant difference in Total Left-Right statistics(TLR) between the two groups.
4. In unilaterally affected subjects for muscle function, no significant difference was observed between the affected side and the contralateral side in articular group, but in muscular group, the item of the number of tender points showed significant difference. However, for occlusal contact items, contact force in articular group showed significant difference between the two sides.
5. Rate of coincidence of the first firing side of TA with affected side or preferred chewing side was higher and not differed between the two groups, but no significant correlation was showed between the first firing side and the first occlusal contact side.
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KEYWORD
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