Document Type : Research Paper
Author
Oral And Maxillofacial Surgery, Basrah Teaching Hospital, Basrah, Iraq
Abstract
Background: EMG assessment has also been applied to study differences between asymptomatic subjects and those suffering from various forms of craniofacial muscle-related dysfunctional symptoms. Aim of Study: To assess application of EMG study of masticatory muscles. Materials and methods: This clinical study included 10 patients, 6 males and 4 females, who were 8 – 62 years old. The mandible has been immobilized for about 5 to 6 weeks. The masseter muscle and anterior fibers of temporalis muscle were chosen as evaluation sites. Results: Thirty-six muscles were taken for EMG analysis, right temporalis (8 muscles, 25%), left temporalis (8 muscles, 25%), right masseter (8 muscles, 25%), left masseter (8 muscles, 25%). Fifty-three percentage of the taken muscles showed positive sharp waves after analysis of the EMG reading. 7 muscles of grade 1, and 10 muscles of grade 2 Fibrillation of taken muscles 16% showed fibrillation potential was seen with grading from 1+ to 4+ Mean MUP duration of temporalis muscles of the examined cases is increased (12.9 ± 6) and the calculated P value is 0.018 (<0.05). Conclusion: MUP onset interval (OI) is a good marker for follow up of muscles in such immobilized cases. Significant decrease in difference of the MUP onset interval (OI) give a picture that the changes occur during period of immobilization are a neuropathic more than myopathic processes. The increase in MUP duration indicates there is increase in number of affected motor units, and this change is of neuropathic. Positive sharp wave and fibrillation potential can be evaluated as indicators of facial muscles acute denervation due to immobilization.
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