Department of Neuroscience, Reproductive Sciences and Oral Sciences, University of Naples "Federico II", Naples, Italy.
Faculty of Dentistry, University of Toronto Centre for the study of Pain, Toronto, ON, Canada.
Cranio. 2021 Mar;39(2):157-163. doi: 10.1080/08869634.2019.1589703. Epub 2019 Mar 21.
: To examine jaw muscle activity of women with chronic temporomandibular myalgia (mTMD). It was hypothesized that mTMD patients had a different masticatory muscle activity, increased work during isometric clenching, and a reduced chewing frequency as compared to TMD-free subjects.: The electromyographic (EMG) activity of temporalis anterior (TA) and masseter (MM) of 27 women with mTMD and 18 TMD-free women was recorded during clenching tasks and while chewing. EMG indices comparing the activity of paired jaw muscles were computed.: Women with TMD myalgia had greater muscular work than controls ( = 0.025). The activity of TA and MM were similar between right and left sides in both groups. mTMD patients had a greater activity of MM than TA ( = 0.028). No between-groups differences were found in chewing rate.: Women with mTMD showed an abnormal recruitment of the jaw-closing muscles during functional tasks, which may predispose to further tissue injury.
: 研究慢性颞下颌肌筋膜疼痛（mTMD）女性的咀嚼肌活动。研究假设 mTMD 患者在等长咬牙时的咀嚼肌活动不同，工作负荷增加，咀嚼频率降低与 TMD 正常的受试者相比。: 记录了 27 名 mTMD 女性和 18 名 TMD 正常女性在咬牙任务和咀嚼过程中颞肌前肌（TA）和咬肌（MM）的肌电图（EMG）活动。计算了比较双侧咀嚼肌活动的 EMG 指标。: 肌筋膜疼痛的 TMD 女性的肌肉工作负荷大于对照组（ = 0.025）。两组中 TA 和 MM 的左右侧活动相似。mTMD 患者的 MM 活动大于 TA（ = 0.028）。咀嚼率在两组之间没有差异。: mTMD 女性在功能任务中表现出咀嚼肌闭合肌肉的异常募集，这可能容易导致进一步的组织损伤。
