Department of Ophthalmology, Otorhinolaryngology and Head and Neck Surgery School of Medicine of Ribeirão Preto, University of São Paulo - USP, Avenida Bandeirantes, 3900, Ribeirão Preto, SP, 14049-900, Brazil.
Craniofacial Research Support Center, University of São Paulo - USP, Ribeirão Preto, SP, Brazil.
Clin Oral Investig. 2019 Aug;23(8):3287-3296. doi: 10.1007/s00784-018-2760-z. Epub 2018 Nov 28.
To investigate whether chronic temporomandibular disorder (TMD) patients showed any changes in swallowing compared to a control group. Moreover, it was examined whether swallowing variables and a valid clinic measure of orofacial myofunctional status were associated.
Twenty-three patients with chronic TMD, diagnosed with disc displacement with reduction (DDR) and pain, according to the Diagnostic Criteria for Temporomandibular Disorders (DC/TMD), and 27 healthy volunteers (control group) were compared. Surface electromyography (EMG) of the temporalis, masseter, sternocleidomastoid, and suprahyoid muscles was performed during swallowing tasks of thin liquid (10 and 15 mL) and spontaneous saliva. Data were normalized.
Compared to the control group, TMD patients showed a prolonged duration of swallowing for liquid and saliva and required a longer time to reach the activity peak and half the integral. While the overall mean value of the relative peaks was similar for the groups, the suprahyoid peak was significantly lower in the TMD group during swallowing of liquid. Moreover, TMD patients recruited the jaw elevator muscles proportionally more than controls. The orofacial myofunctional status was moderately correlated with EMG parameters.
Patients with chronic TMD showed temporal prolongation and changes in the relative activity of the muscles during the swallowing tasks.
The present results contribute additional evidence regarding the reorganization of muscle activity in patients with chronic TMD.
研究慢性颞下颌关节紊乱症（TMD）患者与对照组相比在吞咽方面是否存在变化。此外，还研究了吞咽变量与口面肌肉功能状态的有效临床测量值之间是否存在相关性。
将 23 名患有慢性 TMD 的患者（根据颞下颌关节紊乱症诊断标准（DC/TMD）诊断为盘前移位伴复位（DDR）和疼痛）与 27 名健康志愿者（对照组）进行比较。在吞咽 10 和 15 毫升稀薄液体以及自主分泌唾液时，对颞肌、咬肌、胸锁乳突肌和舌骨上肌群进行表面肌电图（EMG）记录。数据进行了归一化处理。
与对照组相比，TMD 患者的液体和唾液吞咽时间延长，达到活动峰值和半积分所需的时间更长。尽管两组的总体相对峰值平均值相似，但 TMD 组在吞咽液体时舌骨上肌群的峰值明显较低。此外，TMD 患者比对照组更倾向于募集下颌提升肌。口面肌肉功能状态与 EMG 参数呈中度相关。
慢性 TMD 患者在吞咽任务中表现出时间延长和肌肉相对活动的变化。
本研究结果为慢性 TMD 患者的肌肉活动重新组织提供了额外的证据。
