Oral Neurophysiology Research Team, Dental School, University of Dundee, Park Place, Dundee DD1 4HN, Scotland.
Muscle Nerve. 2010 Jun;41(6):845-9. doi: 10.1002/mus.21587.
This study was undertaken to investigate whether an inhibitory jaw reflex could be modulated by experimentally controlled conditions that mimicked symptoms of temporomandibular disorders. Reflecting on previous work, we anticipated that these conditions might suppress the reflex. Electromyographic recordings were made from a masseter muscle in 18 subjects, while electrical stimuli were applied to the upper lip. An inhibitory reflex wave (mean latency 47 ms) was identified and quantified. Immediately following an accelerated chewing task, which in most cases produced muscle fatigue and/or pain, the size of the reflex wave decreased significantly by about 30%. The suppression of inhibitory jaw reflexes by fatigue and pain may result in positive feedback, which may contribute to the symptoms of temporomandibular disorders. Future studies of temporomandibular disorder sufferers will help to determine whether such reflex changes reflect the underlying etiology and/or are a result of the temporomandibular disorder itself.
本研究旨在探讨抑制性颌反射是否可以通过模拟颞下颌关节紊乱症状的实验控制条件来调节。回顾以往的工作，我们预计这些条件可能会抑制反射。对 18 名受试者的咬肌进行肌电图记录，同时对上唇施加电刺激。识别并量化了抑制性反射波（平均潜伏期为 47 毫秒）。在加速咀嚼任务后，大多数情况下会导致肌肉疲劳和/或疼痛，反射波的幅度明显减小约 30%。疲劳和疼痛对抑制性颌反射的抑制可能会导致正反馈，这可能导致颞下颌关节紊乱的症状。对颞下颌关节紊乱患者的进一步研究将有助于确定这种反射变化是否反映了潜在的病因，或者是否是颞下颌关节紊乱本身的结果。
