Table 5 The differences of keratinized gingiva width (mm) before PAOO and 6-month after surgery at different jaw

4.64 ± 1.03

5.58 ± 0.86

0.93 ± 1.25***

3.63 ± 1.19

4.74 ± 0.78

1.01 ± 1.26***

0.431

4.40 ± 1.17

5.60 ± 0.92

1.21 ± 1.64***

3.76 ± 1.01

4.80 ± 0.85

1.07 ± 1.10***

0.590

4.44 ± 1.25

5.12 ± 1.08

0.78 ± 1.45***

3.26 ± 1.10

4.41 ± 1.06

1.15 ± 0.97***

0.066

4.47 ± 1.16

5.41 ± 0.98

0.94 ± 1.43***

3.55 ± 1.12

4.64 ± 0.92

1.11 ± 1.11***

0.184