Relationship between masseter muscle electromyographic activities and the position of the mandible / 南方医科大学学报
Journal of Southern Medical University
;
(12): 1932-1934, 2011.
Article
in Chinese
| WPRIM
| ID: wpr-265748
ABSTRACT
<p><b>OBJECTIVE</b>To investigate the changes in electromyographic activities of the temporal and masseter muscles at different positions of the mandible.</p><p><b>METHODS</b>Twenty orthodontic patients with Angle Class II malocclusion and mandibular retrusion (ANB<6°) aged 10-14 years were enrolled in this study. All the patients were treated with Forsus fixed functional appliance combined with MBT straight-wire appliance. The electromyographic activities of the temporal (T) and masseter (M) muscles before, during and after functional treatment were evaluated by assessing the average integrated electromyogram (EMG) and T/M ratio at clenching status in different mandibular positions.</p><p><b>RESULTS</b>After functional forward positioning of the mandible, the electromyographic activities of the temporal and masseter muscles decreased and T/M ratio increased significance at the clenching status (P<0.05).</p><p><b>CONCLUSION</b>The appliance insertion and activation is associated with a decreased EMG activity of the temporal and masseter muscles, and the T/M ratio is correlated to the position of the mandible.</p>
Full text:
Available
Index:
WPRIM (Western Pacific)
Main subject:
Orthodontic Appliances
/
Retrognathia
/
Temporal Muscle
/
Therapeutics
/
Electromyography
/
Malocclusion, Angle Class II
/
Masseter Muscle
Limits:
Adolescent
/
Child
/
Female
/
Humans
/
Male
Language:
Chinese
Journal:
Journal of Southern Medical University
Year:
2011
Type:
Article
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