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Table 2 Means, SD in parentheses of the molar inclination angles and movement percentages at T1 and T2 and P values, 95% CI of intergroup differences (unpaired t-test): Ret, retention group; Non, non-retention group; *, Mann–Whitney U test

From: Does fixed retention prevent overeruption of unopposed mandibular second molars in maxillary first molar extraction cases?

  T1
Measurement Ret (n=30) Non (n=35) P value 95% CI
36-MP (°) 90.8 (4.9) 92.2 (6.9) 0.34 −1.54 to 4.40
37-MP (°) 91.1 (6.1) 91.2 (7.9) 0.97 −3.49 to 3.62
46-MP (°) 89.4 (5.2) 86.9 (5.5) 0.07 −5.11 to 0.22
47-MP (°) 89.0 (7.4) 85.7 (10.0) 0.13 −7.77 to 1.06
  T2
Measurement Ret (n=30) Non (n=35) P value 95% CI
36-MP (°)* 89.9 (4.4) 91.9 (7.1) 0.09 −1.00 to 4.98
37-MP (°)* 90.7 (4.8) 91.4 (7.2) 0.62 −2.38 to 3.76
46-MP (°) 88.3 (6.5) 86.7 (7.2) 0.32 −4.72 to 1.56
47-MP (°) 87.5 (7.2) 86.1 (10.1) 0.53 −5.80 to 2.99