Table 1 Comparison of the mean difference of alveolar bone changes after extrusion movement of the maxillary and mandibular 1st and 2nd molars

Buccal surface

Maxillary right 1st molar

1.95 ± 0.86

1.54 ± 0.80

0.41 ± 0.53

0.12

Maxillary right 2nd molar

2.60 ± 0.94

3.14 ± 1.25

-0.54 ± 0.70

0.22

Maxillary left 1st molar

1.44 ± 0.16

2.27 ± 0.66

-0.83 ± 0.79

0.21

Mandibular right 1st molar

2.68 ± 1.86

3.73 ± 2.03

-1.05 ± 0.97

0.01*

Mandibular right 2nd molar

1.91 ± 0.88

1.92 ± 1.28

-0.01 ± 0.87

0.95

Mandibular left 1st molar

1.43 ± 0.74

2.20 ± 1.27

-0.76 ± 1.12

0.04*

Mandibular left 2nd molar

1.64 ± 0.77

1.72 ± 0.46

-0.09 ± 1.29

0.78

Lingual surface

Maxillary right 1st molar

2.54 ± 1.08

2.68 ± 1.42

-0.14 ± 1.45

0.82

Maxillary right 2nd molar

3.21 ± 0.67

3.99 ± 1.53

-0.78 ± 1.48

0.37

Maxillary left 1st molar

1.44 ± 0.85

2.96 ± 2.12

-1.53 ± 1.30

0.17

Mandibular right 1st molar

1.17 ± 0.66

1.18 ± 0.78

-0.01 ± 0.42

0.94

Mandibular right 2nd molar

0.98 ± 0.79

0.95 ± 0.73

0.03 ± 0.44

0.80

Mandibular left 1st molar

1.13 ± 0.99

1.00 ± 0.95

0.12 ± 0.62

0.52

Mandibular left 2nd molar

1.06 ± 0.89

1.16 ± 1.17

-0.09 ± 0.64

0.53