BACKGROUND: @entity1348 ( @entity1348 ) can manifest higher range of motions in mandible. The aim of this study was to investigate and compare the activity of masticatory muscle of TMJs in healthy individuals and @entity1 with mild, moderate and severe @entity1348 . MATERIAL AND METHODS: In this clinical study, 69 @entity1 (between the ages of 22 to 42) with manifestation of @entity1348 were included. The @entity1 were divided into three groups based on their maximum mouth opening (MMO): (light) with MMO of 50-55 mm; (moderate) with MMO between 55 to 65 mm; and (severe) with MMO >65 mm. Also, 20 healthy @entity1 with profiled tomography in the last 6 months were invited as control group (healthy) with normal MMO (<50 mm). All the groups subjected to electromyogram (EMG) in 2 steps: maximal @entity2798 (MVC) of the jaws; and during chewing of bread by using one side of the jaws voluntary. The collected data were analyzed by Student T-test and Chi-Square tests using SPSS software version 15 at significant level of 0.05. RESULTS: Both TMJs of light, moderate and severe groups showed significant differences in frequency, time of activity and rest in comparison with healthy group during chewing and MVC (all p values < 0.01). CONCLUSIONS: Masticatory muscles activity reduced in relation with the severity of @entity1348 and higher @entity3137 . Key words:Electromyography, joint @entity8018 , mouth opening, tempormandibular joint.

Investigating activity of masticatory muscles in XXXX with hypermobile temporomandibular joints by using EMG.

@entity1 :: ('9606', 'Species') :: ['patients', 'people'] @entity1348 :: ('MESH:D013706', 'Disease') :: ['Temporomandibular joint hypermobility', 'TMJH'] @entity3137 :: ('MESH:D009059', 'Disease') :: ['excessive mouth opening'] @entity8018 :: ('MESH:C536196', 'Disease') :: ['hypermobility'] @entity2798 :: ('MESH:D009155', 'Disease') :: ['voluntary clenching']
@entity1 :: (9606,Species) :: ['patients']
