Jaw muscle activity patterns in women with chronic TMD myalgia during standardized clenching and chewing tasks. Issue 2 (4th March 2021)

• Record Type: Journal Article
• Authors: Valentino, Roberta; Cioffi, Iacopo; Vollaro, Stefano; Cimino, Roberta; Baiano, Roberta; Michelotti, Ambrosina
• Is Part Of: Cranio. Volume 39:Issue 2(2021)
• Page Start: 157
• Page End: 163
• Publication Date: 2021-03-04
• Subjects: Temporomandibular joint disorders -- masticatory muscles -- surface electromyography -- chewing -- bruxism; Temporomandibular joint disorders -- periodicals; Temporomandibular joint -- Diseases -- Periodicals; 617.51
• DOI: 10.1080/08869634.2019.1589703
• Languages: English
• ISSNs: 0886-9634

Abstract

ABSTRACT: Objective : 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. Methods : 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. Results : Women with TMD myalgia had greater muscular work than controls ( p = 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 ( p = 0.028). No between-groups differences were found in chewing rate. Conclusion : Women with mTMD showed an abnormal recruitment of the jaw-closing muscles during functional tasks, which may predispose to further tissue injury.