Table 2 The differences of gingiva thickness increase (mm) before PAOO and 6-month after surgery at different jaw

0.97 ± 0.27

1.20 ± 0.34

0.23 ± 0.31***

0.71 ± 0.32

0.83 ± 0.34

0.13 ± 0.19***

0.089

1.29 ± 0.33

1.66 ± 0.44

0.36 ± 0.38***

0.93 ± 0.21

1.18 ± 0.36

0.24 ± 0.30***

0.105

1.09 ± 0.29

1.31 ± 0.38

0.24 ± 0.31***

0.88 ± 0.24

1.26 ± 0.28

0.38 ± 0.30***

0.016*

0.97 ± 0.34

1.23 ± 0.37

0.26 ± 0.41***

0.82 ± 0.25

1.25 ± 0.33

0.43 ± 0.35***

0.016*

0.87 ± 0.30

1.12 ± 0.31

0.25 ± 0.32***

0.76 ± 0.18

1.12 ± 0.28

0.36 ± 0.27***

0.045*

0.83 ± 0.21

1.17 ± 0.31

0.34 ± 0.31***

0.66 ± 0.21

0.99 ± 0.28

0.33 ± 0.25***

0.684

0.98 ± 0.32

1.29 ± 0.40

0.30 ± 0.35***

0.79 ± 0.25

1.13 ± 0.33

0.32 ± 0.30***

0.395