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KMID : 0355219930180010055
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Journal of Korean Academy Oral Medicine
1993 Volume.18 No. 1 p.55 ~ p.62
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ELECTROMYOGRAPHIC ACTIVITIES OF THE STERNOCLEIDOMASTOID MUSCLE DURING MASTICATORY FUNCTION
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Abstract
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The author has synchronously recorded that average electromyographic activities of the sternocleidomastoid muscles, the anterior temporal muacles and the masseter muscle.The various levels of occlusal force were checked during clenching the resin
plates
which are made to fit each of the maxillary and the mandibular teeth. These activities were recorded in order to study the EMG activity pattern of the sternocleidomastoid muscle during the masticatory function of the jaw in 11 healthy subjects.
@ES The results were as follows :
@EN 1. The electromyographic activities of the sternocleidomastoid muscles, the anterior temporal muscles and the masseter muscle were increased as the occlusal force increased, and the sternocleidomastoid muscles have a lineal correlationship
with
the
occlusal force.
2. The sternocleidomastoid muscles and the masseter muscles showed higher EMG activity during clenching at the ventroflexed head position rather than at the extended head position.(p>.05) However the EMG activities of the anterior temporal
muscles
showed no difference between the ventroflexed position and the extended position of the head.
3. The electromyographic activities of the sternocleidomastoid muscles, the anterior temporal muscles and the masseter muscles during clenching are similar at the habitural position and at the retruded condylar position.
4. The electromygraphic activities of the sternocleidomastoid muscles, the anterior temporal muscles and the masseter muscles on the working side during mastication of gm and almonds are significanttly higher than on the balancing side except
the
masseter muscles during mastication of almonds.(p<.05, P<.01).
5. The asymmetry of gum are lower than that during mastication almonds.(p<.05)
The asymmetry indices of the sternocleidomastoid muscles are higher than those of the anterior temporal muscles and masseter muscles.
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KEYWORD
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