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KMID : 0362720170550090617
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Journal of the Korean Dental Association
2017 Volume.55 No. 9 p.617 ~ p.624
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Electromyographic activity of masseter and temporal muscle at daytime clenching in adult and adolescent sleep bruxers
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Jang Hyun-Jae
Lee Kyoung-Hoon
Choi Dong-Soon
Cha Bong-Kuen
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Abstract
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Objective: To compare the electromyographic activity of masseter and temporal muscles between bruxers and nonbruxers in adult and adolescent patients.
Material and Methods: The samples composed of the surface electromyography (EMG) recordings obtained from the
orthodontic patients. Sixty-eight patients who had bruxsim habit (43 female and 25 male) were divided into four groups according to their age and gender. Control groups consisted of 79 patients who had not bruxism habit. EMG of the masseter muscle and anterior temporal muscle were recorded before treatment in clenching at maximum intercuspation. The ratio of temporal and masseter muscle activity (T/M ratio) was compared between bruxers and nonbruxers in adult and adolescent patients.
Results: EMG of masseter muscle and temporal muscle were significantly higher in adult male bruxism group than control. T/M ratio in adult male bruxism group was significantly lower than in adult male nonbruxism group. However, there was no significant difference in T/M ratio between adolescent bruxism group and adolescent nonbruxism group.
Conclusions: The balance in the activity of the masseter and temporal muscles may not differ between bruxers and nonbruxers during adolescent periods. However, in adult period, the masseter muscle activity against temporal muscle is greater in males with bruxism habit compared to non-bruxer.
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KEYWORD
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Bruxism, Masseter muscle, Temporal muscle, Electromyography
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