Relationship between masseter muscle electromyographic activities and the position of the mandible.
- Author:
Miao-qiong HUANG
1
;
Hang FENG
;
Can-can ZHOU
;
Ying-yi DAI
Author Information
- Publication Type:Journal Article
- MeSH: Adolescent; Child; Electromyography; Female; Humans; Male; Malocclusion, Angle Class II; physiopathology; therapy; Masseter Muscle; physiopathology; Orthodontic Appliances; Retrognathia; physiopathology; Temporal Muscle; physiopathology
- From: Journal of Southern Medical University 2011;31(11):1932-1934
- CountryChina
- Language:Chinese
-
Abstract:
OBJECTIVETo investigate the changes in electromyographic activities of the temporal and masseter muscles at different positions of the mandible.
METHODSTwenty 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.
RESULTSAfter 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).
CONCLUSIONThe 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.
