Clinical application of the activity index to parameter for evaluation of electromyographic activity of the masticatory muscles

<span style="font-family: Tribune-Italic; font-size: 9pt; color: #231f20; font-style: normal; font-variant: normal;"><em>The purpose of this study was to evaluate the relationship between the intended direction of clenching and changes in the applied </em><span style="font-family: Tribune-Italic; font-size: 9pt; color: #231f20; font-style: normal; font-variant: normal;"><em>activity index of the masticatory muscles. The subjects consisted of twelve male volunteers (average age of 26.3 years). The surface </em><span style="font-family: Tribune-Italic; font-size: 9pt; color: #231f20; font-style: normal; font-variant: normal;"><em>electromyographic activities of the anterior and posterior parts of the temporal muscles, the deep posterior part of the masseter </em><span style="font-family: Tribune-Italic; font-size: 9pt; color: #231f20; font-style: normal; font-variant: normal;"><em>muscle and the superficial central part of the masseter muscle were recorded during the intended clenching in vertical, anterior and </em><span style="font-family: Tribune-Italic; font-size: 9pt; color: #231f20; font-style: normal; font-variant: normal;"><em>posterior directions. The changes of the applied activity index (the relative different value between the examined muscle activity and </em><span style="font-family: Tribune-Italic; font-size: 9pt; color: #231f20; font-style: normal; font-variant: normal;"><em>the superficial central part of the masseter muscle activity) were evaluated. The applied activity indexes of the anterior and posterior </em><span style="font-family: Tribune-Italic; font-size: 9pt; color: #231f20; font-style: normal; font-variant: normal;"><em>parts of the temporal muscles and the deep posterior part of the masseter muscle decreased significantly during the intended clenching </em><span style="font-family: Tribune-Italic; font-size: 9pt; color: #231f20; font-style: normal; font-variant: normal;"><em>in the posterior direction. Those of the anterior and posterior parts of the temporal muscles increased significantly during the intended </em><span style="font-family: Tribune-Italic; font-size: 9pt; color: #231f20; font-style: normal; font-variant: normal;"><em>clenching in the anterior direction. Each applied activity index changed corresponding to the differences of the running directions in </em><span style="font-family: Tribune-Italic; font-size: 9pt; color: #231f20; font-style: normal; font-variant: normal;"><em>the sagittal plane between the superficial masseter muscle and these three muscles. The applied activity indexes of the anterior and </em><span style="font-family: Tribune-Italic; font-size: 9pt; color: #231f20; font-style: normal; font-variant: normal;"><em>posterior parts of the temporal muscles and the deep posterior part of the masseter muscle significantly changed during clenching </em><span style="font-family: Tribune-Italic; font-size: 9pt; color: #231f20; font-style: normal; font-variant: normal;"><em>in anteroposterior direction. Therefore, it was suggested that the applied activity indexes of these three muscles could be used as a </em><span style="font-family: Tribune-Italic; font-size: 9pt; color: #231f20; font-style: normal; font-variant: normal;"><em>parameter to indicate the anteroposterior direction of force on the lower jaw.</em></span></span></span></span></span></span></span></span></span></span></span></span><br style="font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-align: -webkit-auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px;" /></span>

Abstract licence: CC BY-SA

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