Dental Journal (Majalah Kedokteran Gigi)
ISSN 1978-3728
Vol. 39 / No. 4 / Published : 2006-10
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Original Article :
Clinical application of the activity index to parameter for evaluation of electromyographic activity of the masticatory muscles
Author :
- Takashi Tanaka*1
- Department of Prosthetic Dentistry, Programs for Applied Biomedicine Division of Cervico-Gnathostomatology, Hiroshima University Graduate School of Biomedical Sciences, Hiroshima, Japan
Abstract :
The purpose of this study was to evaluate the relationship between the intended direction of clenching and changes in the applied activity index of the masticatory muscles. The subjects consisted of twelve male volunteers (average age of 26.3 years). The surface electromyographic activities of the anterior and posterior parts of the temporal muscles, the deep posterior part of the masseter muscle and the superficial central part of the masseter muscle were recorded during the intended clenching in vertical, anterior and posterior directions. The changes of the applied activity index (the relative different value between the examined muscle activity and the superficial central part of the masseter muscle activity) were evaluated. The applied activity indexes of the anterior and posterior parts of the temporal muscles and the deep posterior part of the masseter muscle decreased significantly during the intended clenching in the posterior direction. Those of the anterior and posterior parts of the temporal muscles increased significantly during the intended clenching in the anterior direction. Each applied activity index changed corresponding to the differences of the running directions in the sagittal plane between the superficial masseter muscle and these three muscles. The applied activity indexes of the anterior and posterior parts of the temporal muscles and the deep posterior part of the masseter muscle significantly changed during clenching in anteroposterior direction. Therefore, it was suggested that the applied activity indexes of these three muscles could be used as a parameter to indicate the anteroposterior direction of force on the lower jaw.
Keyword :
electromyographic, activity index, direction, clenching ,
References :
Scapino,(1991) The posterior attachment: Its structure, function, and appearance in TMJ imaging studies
- : Journal Craniomandib Disord Facial Oral Pain
Ferrario,(1994) Biomechanical model of the human mandible in unilateral clench: distribution of temporomandibular joint reaction forces between working and balancing sides - : Journal Prosthet Dent
Sforza,(1994) Biomechanical model of the human mandible in unilateral clench: distribution of temporomandibular joint reaction forces between working and balancing sides - : Journal Prosthet Dent
Osborn,(1995) Biomechanical implications of lateral pterygoid contribution to biting and jaw opening in humans - : Arch Oral Biol
Wood,(1987) A review of masticatory muscle functuion - : Journal Prosthet Dent
MacDonald,(1984) Relationship between occlusal contacts and jaw-closing muscle activity during tooth clenching - : Journal Prosthet Dent
Hannam,(1984) Relationship between occlusal conta
Archive Article
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 Volume : 39 / No. : 4 / Pub. : 2006-12 |
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