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KMID : 0355219900150010037
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Journal of Korean Academy Oral Medicine
1990 Volume.15 No. 1 p.37 ~ p.44
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A Pattern of Electromyographic Activities of Masseter Muscles and Temporalis Anteriors to Maximum Bite Force in TMD patients.
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Abstract
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The author has synchronously recorded average electromyographic activities of temporaries anterior and massetred muscles and the maximum bite force on the mandibular first molar on the preferred chewing side. These activities were recorded in order to study the EMG activity pattern of the working side and the balancing side to maximum bite force and functioning state of muscle in 30 patients with TMD and in 30 healthy subjects as controls. Activities of each muscle in TMD patients were 61.0 %-62. 8 % of the healthy subjects.
The results were as follows
1. The maximum bite force on the mandibular first molar on the preferred chewing side was 20.63kg in TMD patients and 53.30kg in the healthy subjects(p<0.01). The maximum bite force in TMD patients was 38.7 % of the healthy subjects.
2. The average electromyographic activities of temporalis anteriors and massete - muscles on the working side and the balancing side during maximum bite force were lower in TMD patients than in the healthy subjects(p<0.01). The average electromygraphic activities of each muscle. in TMD patients were 61.0 %-62.8 % of the healthy subjects.
3. The proportionalities of average electromyographic activities of temporalis anteriors and masseter muscles on the working side and the balancing side to maximum bite force were greater in TMD patients than in the healthy subjects(p<0.01).
4. Between the working side and the balancing side, the proportionality of average electromyographic activity of temporalis anterior to maximum bite force on the working side was less than that on the balancing side in both TMD patients(p<0.05) and the healthy subjects(p < 0.01). The proportionality of average electromyographic activity of masseter muscle to maximum bite force was not significantly different between the working side and the balancing side in both groups(p > 0.05 ).
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