Table 2.

Values of masseter muscle (expressed in kPa) stiffness from previous studies measured with the Aixplorer device.

Author	Quantity	Elasticity Values of the Masseter Muscle, kPa
Arda, 2011 [2]	127 healthy adult volunteers	Total: 10.4 ± 3.7 (range, 2–23) Men: 10.8 ± 3.9 (range, 4–20) Women: 10.3 ± 3.6 (range, 2–23)
Herman, 2017 [17]	176 healthy adult volunteers	10.0 ± 4.3, median 9.85
Olchowy, 2020 [11]	20 healthy adult volunteers	11.46 ± 1.55
Olchowy, 2021 [12]	51 healthy adult volunteers	Left: from 10.72 ± 2.32 to 10.67 ± 2.23 Right: from 10.88 ± 2.34 to 10.54 ± 2.38
Olchowy, 2021 [18]	40 healthy adult volunteers	Total: median 11.35 (interquartile range, 9.7–12.65) Left: 10.99 ± 2.04 Right: 11.01 ± 2.21