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J Orthod Sci. 2018 Feb 15;7:3. doi: 10.4103/jos.JOS_74_17. eCollection 2018.

Association between muscle activity and overjet in class II malocclusion with surface electromyography.

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Orthodontic Unit, School of Dental Science, Universiti Sains Malaysia, Kubang Kerian, Malaysia.
Department of Medicine (Neurology), College of Medicine, Al Jouf University, Sakaka, Kingdom of Saudi Arabia.
Department of Prosthodontic, School of Dental Science, Universiti Sains Malaysia, Kubang Kerian, Kota Bharu, Kelantan, Malaysia.
Department of Orthodontic, College of Dentistry, Al Jouf University, Sakaka, Kingdom of Saudi Arabia.



The aim of the study was to assess the association and correlation between the overjet and muscle activity (the masseter and temporalis muscles) in patient with Class II malocclusion in different genders using surface electromyography (sEMG).


The overjet (measured clinically) and electromyographical activity (rest, chew, post chew rest, clench and post clench rest) of the masseter and temporalis muscle of class II malocclusion patient were assessed in 18 patients (3 males and 15 females) from the School of Dental Science, Hospital University Sains Malaysia.


The results were compared by simple linear regression test to evaluate the association between overjet and muscle activity in different genders. Class II malocclusion patients with increased overjet group showed significant association with masseter muscle activity on chewing stage (P = 0.005, F = 6.081 and adj-R2 = 0.473). Left temporalis muscle in class II malocclusion showed a significant linear association (P = 0.014, F = 0.812 and adj-R2= -0.034) with gender during clench.


In conclusion, class II malocclusion patient with increased overjet can affect masticatory muscle function and as well as clench force may differ in gender.


Class II malocclusion; electromyography; muscle activity; overjet

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