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Table 2 Position and angulation of third molar compared between pre- and post- therapy

From: Influence of orthodontic treatment with premolar extraction on the spatial position of maxillary third molars in adult patients: a retrospective cohort cone-bean computed tomography study

 

Pretreatment

Posttreatment

Treatment effect

P value

Mean

SD

Mean

SD

Mean

SD

Angulation (°)

U7 axis with U8 axis

13.28

8.97

13.53

10.08

0.25

0.40

0.854

U8 axis with horiz

62.76

15.13

63.51

14.39

0.75

10.92

0.632

U8 axis with sagit

16.85

10.40

15.21

10.32

−1.63

10.27

0.272

U8 axis with front

20.13

15.24

19.90

15.22

−0.23

9.90

0.872

Rotation (°)

U8 Cr with horiz

18.35

12.48

15.91

8.02

−2.45

10.76

0.118

U8 Cr with sagit

21.20

12.14

17.21

14.67

−3.98

10.35

0.01*

U8 Cr with front

59.24

10.70

64.62

11.64

5.38

10.43

0.001†

Position (mm)

U8 MB cusp to front

−40.83

3.16

−39.39

3.67

1.44

1.83

 < 0.001‡

U8 MB cusp to horiz

−36.49

6.51

−39.36

6.51

−2.87

2.26

 < 0.001‡

U8 MB cusp to sagit

31.09

2.49

31.16

2.17

0.07

1.34

0.702

U8 DB cusp to front

−45.02

3.15

−43.52

3.56

1.50

1.71

 < 0.001‡

U8 DB cusp to horiz

−35.50

6.49

−38.60

6.44

−3.10

2.00

 < 0.001‡

U8 DB cusp to sagit

29.51

2.86

30.20

2.52

0.69

1.72

0.007†

  1. U7 maxillary second molar, U8 maxillary third molar, Cr crown, horiz horizontal plane; front frontal plane, sagit sagittal plane, MB mesial buccal, DB distal buccal
  2. *p < 0.05; †p < 0.01; ‡p < 0.001