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Cranio. 2019 Mar 21:1-7. doi: 10.1080/08869634.2019.1589703. [Epub ahead of print]

Jaw muscle activity patterns in women with chronic TMD myalgia during standardized clenching and chewing tasks.

Author information

1
a Department of Neuroscience, Reproductive Sciences and Oral Sciences , University of Naples "Federico II" , Naples , Italy.
2
b Faculty of Dentistry , University of Toronto Centre for the study of Pain , Toronto , ON , Canada.

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.

KEYWORDS:

Temporomandibular joint disorders; bruxism; chewing; masticatory muscles; surface electromyography

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