Table 3 Means, SD in parentheses of the molar inclination angles and movement percentages between T1 and T2, and P values, 95% CI of intragroup differences (paired t-test): Ret, retention group; Non, non-retention group; *, Wilcoxon signed-rank test

36-MP (°)*

−0.9 (3.6)

0.18

−0.45 to 2.24

−0.3 (3.5)

0.58

−0.88 to 1.55

37-MP (°)*

−0.4 (4.4)

0.60

−1.21 to 2.05

0.2 (3.6)

0.73

−1.44 to 1.02

46-MP (°)

−1.1 (4.1)

0.16

−0.46 to 2.60

−0.2 (4.3)

0.77

−1.26 to 1.67

47-MP (°)

−1.5 (4.6)

0.09

−0.25 to 3.22

0.5 (5.2)

0.59

−2.27 to 1.32

37 V/MD (%)

1.0 (4.4)

0.23

−0.66 to 2.65

1.2 (5.2)

0.19

−0.60 to 2.98

47 V/MD (%)

0.5 (5.5)

0.61

−1.54 to 2.57

1.1 (5.7)

0.26

−0.84 to 3.06