Electromyographic evaluation of masseteric activity during maximum opening in patients with temporomandibular disorders and limited mouth opening
Abstract This study aimed to identify the differences in masseteric activity during maximum mouth opening among healthy volunteers, patients with limited mouth opening (LMO) and myofascial pain, and patients with LMO and disc displacement. Thirty-seven patients with temporomandibular disorders and L...
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Nature Portfolio
2025-04-01
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| Online Access: | https://doi.org/10.1038/s41598-025-97877-5 |
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| author | Xiaoyu Lin Ryota Takaoka Daisuke Moriguchi Shion Morioka You Ueda Rie Yamamoto Emi Ono Shoichi Ishigaki |
| author_facet | Xiaoyu Lin Ryota Takaoka Daisuke Moriguchi Shion Morioka You Ueda Rie Yamamoto Emi Ono Shoichi Ishigaki |
| author_sort | Xiaoyu Lin |
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| description | Abstract This study aimed to identify the differences in masseteric activity during maximum mouth opening among healthy volunteers, patients with limited mouth opening (LMO) and myofascial pain, and patients with LMO and disc displacement. Thirty-seven patients with temporomandibular disorders and LMO (< 40 mm) and 27 healthy volunteers participated in this study. Patients were categorized into three groups based on magnetic resonance imaging (MRI) findings and clinical symptoms: disc displacement (DD), disc displacement with myofascial pain (DD + M), and myofascial pain (M). The DD group included pain-free disc patients with displacement patients, excluding those with myofascial pain or arthralgia. After a five-minute relaxation period, the participants were instructed to perform maximum opening (Omax) and maintain the Omax position for five seconds, and this was repeated three times. Subsequently, the participants were asked to perform maximum voluntary clenching for five seconds, which was repeated twice. At rest, no significant masseter potential differences were observed among the DD, DD + M, M, and healthy groups (p > .05). However, during Omax, the DD + M and M groups exhibited significantly higher masseteric potential than the healthy and DD groups (p < .001). Furthermore, the masseteric potential during Omax correlated with self-reported pain levels on a Visual Analog Scale (VAS). Overall, there are distinct differences in masseteric activity levels between patients with LMO and with or without myofascial pain or disc displacement. |
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| institution | DOAJ |
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| language | English |
| publishDate | 2025-04-01 |
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| spelling | doaj-art-41baf51c251a4e3da3a2c7b5d11ee8212025-08-20T03:05:26ZengNature PortfolioScientific Reports2045-23222025-04-011511910.1038/s41598-025-97877-5Electromyographic evaluation of masseteric activity during maximum opening in patients with temporomandibular disorders and limited mouth openingXiaoyu Lin0Ryota Takaoka1Daisuke Moriguchi2Shion Morioka3You Ueda4Rie Yamamoto5Emi Ono6Shoichi Ishigaki7Department of Fixed Prosthodontics and Orofacial Function, Osaka University Graduate School of DentistryDepartment of Fixed Prosthodontics and Orofacial Function, Osaka University Graduate School of DentistryDepartment of Fixed Prosthodontics and Orofacial Function, Osaka University Graduate School of DentistryDepartment of Fixed Prosthodontics and Orofacial Function, Osaka University Graduate School of DentistryDepartment of Fixed Prosthodontics and Orofacial Function, Osaka University Graduate School of DentistryDepartment of Fixed Prosthodontics and Orofacial Function, Osaka University Graduate School of DentistryDepartment of Fixed Prosthodontics and Orofacial Function, Osaka University Graduate School of DentistryDepartment of Fixed Prosthodontics and Orofacial Function, Osaka University Graduate School of DentistryAbstract This study aimed to identify the differences in masseteric activity during maximum mouth opening among healthy volunteers, patients with limited mouth opening (LMO) and myofascial pain, and patients with LMO and disc displacement. Thirty-seven patients with temporomandibular disorders and LMO (< 40 mm) and 27 healthy volunteers participated in this study. Patients were categorized into three groups based on magnetic resonance imaging (MRI) findings and clinical symptoms: disc displacement (DD), disc displacement with myofascial pain (DD + M), and myofascial pain (M). The DD group included pain-free disc patients with displacement patients, excluding those with myofascial pain or arthralgia. After a five-minute relaxation period, the participants were instructed to perform maximum opening (Omax) and maintain the Omax position for five seconds, and this was repeated three times. Subsequently, the participants were asked to perform maximum voluntary clenching for five seconds, which was repeated twice. At rest, no significant masseter potential differences were observed among the DD, DD + M, M, and healthy groups (p > .05). However, during Omax, the DD + M and M groups exhibited significantly higher masseteric potential than the healthy and DD groups (p < .001). Furthermore, the masseteric potential during Omax correlated with self-reported pain levels on a Visual Analog Scale (VAS). Overall, there are distinct differences in masseteric activity levels between patients with LMO and with or without myofascial pain or disc displacement.https://doi.org/10.1038/s41598-025-97877-5Temporomandibular disordersLimited mouth openingElectromyographyMasseter muscleMyofascial pain |
| spellingShingle | Xiaoyu Lin Ryota Takaoka Daisuke Moriguchi Shion Morioka You Ueda Rie Yamamoto Emi Ono Shoichi Ishigaki Electromyographic evaluation of masseteric activity during maximum opening in patients with temporomandibular disorders and limited mouth opening Scientific Reports Temporomandibular disorders Limited mouth opening Electromyography Masseter muscle Myofascial pain |
| title | Electromyographic evaluation of masseteric activity during maximum opening in patients with temporomandibular disorders and limited mouth opening |
| title_full | Electromyographic evaluation of masseteric activity during maximum opening in patients with temporomandibular disorders and limited mouth opening |
| title_fullStr | Electromyographic evaluation of masseteric activity during maximum opening in patients with temporomandibular disorders and limited mouth opening |
| title_full_unstemmed | Electromyographic evaluation of masseteric activity during maximum opening in patients with temporomandibular disorders and limited mouth opening |
| title_short | Electromyographic evaluation of masseteric activity during maximum opening in patients with temporomandibular disorders and limited mouth opening |
| title_sort | electromyographic evaluation of masseteric activity during maximum opening in patients with temporomandibular disorders and limited mouth opening |
| topic | Temporomandibular disorders Limited mouth opening Electromyography Masseter muscle Myofascial pain |
| url | https://doi.org/10.1038/s41598-025-97877-5 |
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