Oral & Maxillofacial Surgery, Faculty of Oral & Dental Medicine, Cairo University, Egypt.
Acta Odontol Scand. 2012 Jan;70(1):72-7. doi: 10.3109/00016357.2011.597776. Epub 2011 Jul 5.
The aim of this study was to assess the effect of occlusal splint therapy on the electromyographic amplitude records (μV) of masticatory muscles in temporomandibular disorder (TMD) with myofascial pain and to detect a possible existence of a relationship between this effect and the treatment outcome.
Forty patients (23 females and 17 males) having TMD with myofascial pain were included in this study. They were randomly divided into two equal groups (20 of each). The first group (A) was treated by occlusal splints for 6 months while the second group (B) acted as a control. A clinical assessment and surface electromyography (EMG) for the masticatory muscles were performed at the beginning of the study, then 6 months later. The collected data were statistically analyzed using paired t-test. The differences were considered significant at p < 0.05.
The results showed that 85% of group A either completely recovered (35%) or clinically improved (50%) while only 20% of group B had a spontaneous improvement. In group A, the means of the electromyographic amplitude records (μV) of the monitored muscles have decreased after 6 months. However, the decrease was statistically insignificant (p > 0.05) in the patients (15%) who had no clinical changes. In group B, the means of the muscles' records (μV) in the left side slightly increased while those of the right side slightly decreased. These changes were statistically insignificant (p > 0.05).
Occlusal splint could eliminate or improve the signs and symptoms of TMD patients with myofascial pain. It reduces the electromyographic amplitude records (μV) of the masticatory muscles. The splint therapy outcome has a correlation with the electromyographic amplitude changes of the masticatory muscles.
本研究旨在评估咬合夹板治疗对伴肌筋膜疼痛的颞下颌关节紊乱病（TMD）患者咀嚼肌肌电图幅度记录（μV）的影响，并检测这种影响与治疗效果之间是否存在关系。
本研究纳入了 40 名（23 名女性，17 名男性）伴肌筋膜疼痛的 TMD 患者。他们被随机分为两组（每组 20 名）。第一组（A 组）接受咬合夹板治疗 6 个月，第二组（B 组）为对照组。在研究开始时和 6 个月后，对患者进行临床评估和咀嚼肌表面肌电图（EMG）检查。采用配对 t 检验对收集的数据进行统计学分析。差异有统计学意义（p < 0.05）。
结果显示，A 组 85%的患者完全缓解（35%）或临床改善（50%），而 B 组仅 20%的患者自发改善。A 组患者治疗 6 个月后，监测肌肉的肌电图幅度记录（μV）平均值下降。然而，无临床变化的患者（15%）的下降无统计学意义（p > 0.05）。B 组患者左侧肌肉记录（μV）平均值略有增加，右侧略有减少。这些变化无统计学意义（p > 0.05）。
咬合夹板治疗可消除或改善伴肌筋膜疼痛的 TMD 患者的症状和体征。它降低了咀嚼肌的肌电图幅度记录（μV）。夹板治疗效果与咀嚼肌肌电图幅度变化相关。
