Journal of Oral and Maxillofacial Surgery, Volume. 35, Issue 3, 199(2025)

Clinical study on the effect of temporomandibular joint disc anchorage on surface electromyographic characteristics of the masticatory muscles

LIN Yuxiang, LI Chenxi, and GONG Zhongcheng*
Author Affiliations
  • Department of Oral and Maxillofacial Oncology & Surgery, the First Affiliated Hospital of Xinjiang Medical University, School and Hospital of Stomatology, Xinjiang Medical University, Stomatological Research Institute of Xinjiang Uygur Autonomous Region, Urumqi830054, China
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    Objective:To evaluate the effect of temporomandibular joint disc anchorage (DA) on the surface electromyography (sEMG) characteristics of the masticatory muscles and its clinical outcome.Methods:A total of twenty-three patients with anterior disc displacement without reduction (ADDwoR) who underwent temporomandibular joint disc anchorage (DA) between December 2022 and January 2024 were collected to compare their preoperative, 3-month postoperative, and 6-month postoperative maximal interincisal opening (MIO), visual analogue scale (VAS) scores, mandibular border movement (BM) distance, and sEMG of anterior temporalis (TA) and masseter muscle (MM).Results:Patients' MIO increased at 6months postoperatively compared with preoperative levels (P<0.05), BM distance did not change significantly, VAS scores during wide mouth opening and in the preauricular region decreased compared with preoperative levels (P<0.05). In unilateral DA patients, the mean amplitude of TA sEMG was higher at 6months postoperatively than that at 3months postoperatively (P<0.05). At 6 months postoperatively, the mean MM sEMG amplitude was elevated on the non-operative side compared with preoperative and 3-month postoperative levels, and was reduced on the operative side compared with 3-month postoperative levels. The non-operative side showed higher amplitude than the operative side both preoperative and 6months postoperatively, and lower amplitude at 3months postoperatively (P<0.05). In bilateral DA patients, the mean TA sEMG amplitude decreased at 3months postoperatively compared with preoperative levels (P<0.05), and the mean MM sEMG amplitude decreased at 3months postoperatively compared with preoperative levels, but increased and was higher than the preoperative levels at 6months postoperatively (P<0.05).Conclusion:DA can reduce the pain of ADDwoR patients, improve the mandibular motor function, and make the sEMG tend to be balanced and stable, with good clinical efficacy.

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    LIN Yuxiang, LI Chenxi, GONG Zhongcheng. Clinical study on the effect of temporomandibular joint disc anchorage on surface electromyographic characteristics of the masticatory muscles[J]. Journal of Oral and Maxillofacial Surgery, 2025, 35(3): 199

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    Paper Information

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    Received: Jan. 6, 2025

    Accepted: Aug. 21, 2025

    Published Online: Aug. 21, 2025

    The Author Email: GONG Zhongcheng (gzc740904@xjmu.edu.cn)

    DOI:10.12439/kqhm.1005-4979.2025.03.005

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