Table 4 The changes of ridge height, width and grey value between preoperative, 3 and 6 months later in two groups

17.22 ± 1.13

17.16 ± 1.25

0.868

15.66 ± 1.34

16.86 ± 1.25

 < 0.05

14.89 ± 1.53

16.52 ± 1.26

 < 0.05

16.85 ± 1.34

16.68 ± 1.36

0.713

14.01 ± 1.36

16.61 ± 1.37

 < 0.05

13.20 ± 1.25

15.18 ± 1.37

 < 0.05

6.37 ± 0.76

6.41 ± 0.60

0.866

4.43 ± 0.67

5.91 ± 0.67

 < 0.05

3.22 ± 0.69

5.10 ± 0.71

 < 0.05

8.10 ± 0.60

8.26 ± 0.55

0.432

5.49 ± 1.05

7.60 ± 0.74

 < 0.05

4.82 ± 0.99

6.93 ± 0.71

 < 0.05

10.76 ± 0.60

10.94 ± 0.51

0.32

9.10 ± 0.86

10.20 ± 0.59

 < 0.05

8.51 ± 0.91

9.46 ± 0.43

0.28