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The Chinese Journal of Dental Research

Year 2001
Volume 4 , Issue 3

Pages: 57 - 66

EMG Activity of Head, Neck, and Back Muscles with Mandibular Movement in Healthy Adults and in Patients with Mandibular Asymmetry

Ting Jiang, DDS, PhD/Zhen Kang Zhang, DDS/Zhao Hui Yang, DDS/Biao Yi, DDS, PhD/Hialan Feng, DDS, PhD/Xing Wang, DDS, PhD

Objective: To study the influence of mandibular function on head and neck regions. Methods: The integral data of surface electromyography were recorded to analyze the activities of anterior temporal (Ta), posterior temporal (Tp), sternocleidomastoid (SCM), and trapezius (TRAP) muscles with mandibular movement in 10 healthy adults and 10 patients with asymmetric mandibles. Results: All 4 muscles acted with the mandible in the rest position. The activities of Ta, Tp, and SCM muscles increased with mandible protrusion, mouth opening, tapping, maximum clenching, and chewing. The activities of Ta and Tp of the patients with asymmetry were stronger than that of the healthy subjects without occlusion. The patients had greater differences between left and right side muscles and had stronger activities of the TRAP muscles than healthy subjects. Conclusion: These results suggest that the cervical, upper trunk, and head muscles can contribute to the mandibular position. The muscle activity changed in the patients with mandibular asymmetry.



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