Jahanbin Arezoo, Ahrari Farzaneh, Saeidi Morteza, Moeinifar Azam, Sharifi Farid
Dental Research Center, School of Dentistry.
Department of Neurology, Ghaem Hospital, Mashhad University of Medical Sciences.
J Craniofac Surg. 2019 Sep;30(6):e547-e551. doi: 10.1097/SCS.0000000000005560.
This study aimed to determine the electrical activity of masseter and anterior temporal muscles in patients with unilateral cleft lip and palate (CLP) and compare it with healthy volunteers. The study involved 20 female patients (mean age 20 ± 4 years) with unilateral cleft lip and palate who had undergone lip and palate surgery in childhood and finished the first-phase orthodontic therapy with level and align teeth. Twenty age- and sex-matched volunteers with no cleft lip and palate were involved as controls. Electromyographic (EMG) signals of masseter and anterior temporal muscles were recorded at rest position, during swallowing and during maximum bite force (MBF). EMG signals at different test conditions were compared between the cleft and noncleft sides of CLP patients and between CLP patients and healthy individuals. The EMG potentials of masseter (rest, swallowing, MBF) and temporal (rest, MBF) muscles were significantly higher in the cleft than the noncleft side of CLP patients (P value <0.001). Generally, patients with unilateral cleft lip and palate experienced a significant increase in the electrical activity of the masseter and temporal muscles in both sides compared to the control group (P <0.05). In conclusion, patients with unilateral cleft lip and palate exhibit overall greater masticatory muscle activity compared to healthy individuals. The asymmetric masticatory function in subjects with unilateral cleft lip and palate may be associated with severe consequences such as asymmetric facial growth, implying the importance of early diagnosis and orthodontic treatment to achieve a favorable environment for balanced facial growth in CLP affected patients.
本研究旨在确定单侧唇腭裂（CLP）患者咬肌和颞前肌的电活动，并将其与健康志愿者进行比较。该研究纳入了20名女性单侧唇腭裂患者（平均年龄20±4岁），她们在儿童期接受了唇腭裂手术，并完成了第一阶段的牙齿排齐正畸治疗。20名年龄和性别匹配的无唇腭裂志愿者作为对照。在静息位、吞咽过程中和最大咬合力（MBF）时记录咬肌和颞前肌的肌电图（EMG）信号。比较CLP患者腭裂侧与非腭裂侧以及CLP患者与健康个体在不同测试条件下的EMG信号。CLP患者咬肌（静息、吞咽、MBF）和颞肌（静息、MBF）的EMG电位在腭裂侧显著高于非腭裂侧（P值<0.001）。总体而言，与对照组相比，单侧唇腭裂患者两侧咬肌和颞肌的电活动显著增加（P<0.05）。总之，与健康个体相比，单侧唇腭裂患者的咀嚼肌活动总体上更强。单侧唇腭裂患者的不对称咀嚼功能可能会导致如面部生长不对称等严重后果，这意味着早期诊断和正畸治疗对于为CLP患者创造有利于面部平衡生长的环境至关重要。
