Table 4 Ultrasonography examination of masticatory muscles in upright and supine positions.

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

Unit: mm

TMD_nonbruxers (n = 66)

Mean ± SD

TMD_bruxers (n = 30)

Mean ± SD

p-value (nonbruxers vs. bruxers)

Male (n = 29)

Female (n = 67)

p-value (male vs. female)

Mean ± SD

Mean ± SD

Upright position

Masseter m.

Resting

10.44 ± 2.77

12.73 ± 3.03

 < 0.001***

12.46 ± 3.14

10.59 ± 2.83

0.008**

Clenching

13.48 ± 3.41

15.26 ± 3.39

0.021*

14.98 ± 3.00

13.69 ± 3.59

0.074

Temporal m.

Resting

7.59 ± 1.90

8.05 ± 2.01

0.284

7.97 ± 1.75

7.76 ± 2.45

0.688

Clenching

7.89 ± 1.96

8.61 ± 2.12

0.114

8.49 ± 1.83

8.16 ± 2.61

0.540

Supine position

Masseter m.

Resting

10.93 ± 2.55

11.92 ± 1.97

0.043*

12.43 ± 2.74

10.72 ± 2.08

0.004**

Clenching

12.97 ± 3.05

14.62 ± 2.90

0.014*

15.23 ± 3.35

12.73 ± 2.66

 < 0.001***

Temporal m.

Resting

7.74 ± 1.85

8.43 ± 2.27

0.119

8.44 ± 2.94

8.11 ± 1.58

0.578

Clenching

8.04 ± 1.86

8.61 ± 1.96

0.179

8.53 ± 2.37

8.39 ± 1.74

0.765

  1. The results were obtained using t-tests. m, masseter muscle. 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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