Table 3 Masseter and temporal muscle thickness during resting and clenching in patients with TMD.

From: Comparison of ultrasonography-based masticatory muscle thickness between temporomandibular disorders bruxers and temporomandibular disorders non-bruxers

Total TMD patients (n = 96)

Resting

Mean ± SD

Clenching

Mean ± SD

p-value (resting vs. clenching)

Thickness differencea

Unit: mm

Mean ± SD

Upright position

Masseter m.

11.16 ± 3.03

14.04 ± 3.47

 < 0.001***

2.92 ± 2.24

Temporalis m.

7.91 ± 1.98

8.39 ± 2.08

0.103

0.48 ± 1.21

Supine position

Masseter m.

11.24 ± 2.42

13.49 ± 3.09

 < 0.001***

2.25 ± 1.90

Temporalis m.

8.21 ± 2.16

8.43 ± 1.94

0.464

0.22 ± 0.76

  1. The results were obtained using t-tests. TMD, temporomandibular disorder; m, masseter muscle.
  2. aDifference between muscle thickness at clenching and that at rest. Statistical significance was set at p < 0.05. *p < 0.05, **p < 0.01, ***p < 0.001. The significant values are indicated in bold font.
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