Table 3 The mean pressure under different loading conditions in the unfixed and fixed groups (MPa)

1.29 ± 0.22

1.16 ± 0.24

89.64

1.52 ± 0.19

1.17 ± 0.18

77.03

1.06 ± 0.11

1.23 ± 0.25

115.86

1.69 ± 0.34

0.93 ± 0.17*

54.95

1.86 ± 0.33

0.91 ± 0.16*

48.95

1.93 ± 0.20

0.90 ± 0.16*

46.60

1.53 ± 0.32

0.67 ± 0.04*

43.80

1.73 ± 0.28

0.58 ± 0.11*

33.66

1.39 ± 0.25

0.75 ± 0.14*

53.82

1.30 ± 0.18

0.93 ± 0.14*

71.24

0.97 ± 0.19

0.86 ± 0.12*

88.57

1.22 ± 0.20

1.09 ± 0.22

89.10

1.48 ± 0.26

1.11 ± 0.18*

74.71

1.11 ± 0.21

1.05 ± 0.22

95.21

1.47 ± 0.27

1.06 ± 0.18*

72.10