Table 3 Intergroup comparisons of the individual PAR components at T2 and T3 and during the long-term posttreatment period (Mann–Whitney U test)
From: Stability of class II subdivision malocclusion treatment with 3 and 4 premolar extractions
Variable | Group 1 (3 premolar extractions) n = 24 | Group 2 (4 premolar extractions) n = 28 | |
|---|---|---|---|
Mean rank | p | ||
Mean (SD) | |||
Posterior segments AP discrepancy at T2 (mm) | 22.04 | 30.32 | 0.05 |
1.08 (0.50) | 1.43 (0.69) | ||
Posterior segments AP discrepancy at T3 (mm) | 25.38 | 27.46 | 0.62 |
1.33 (0.92) | 1.39 (0.99) | ||
Posttreatment change in posterior segments AP discrepancy (T3 − T2) (mm) | 28.25 | 25.00 | 0.44 |
0.25 (1.15) | −0.04 (0.88) | ||
OJ at T2 (mm) | 26.50 | 26.5 | 1.00 |
0.00 (0.00) | 00.00 (0.00) | ||
OJ at T3 (mm) | 26.00 | 26.93 | 0.83 |
0.00 (0.00) | 0.04 (0.19) | ||
Posttreatment change in OJ (mm) (T3 − T2) | 26.00 | 26.92 | 0.83 |
−0.13 (0.34) | −0.21 (0.83) | ||
OB at T2 (mm) | 26.63 | 26.39 | 0.96 |
0.13 (0.34) | 0.25 (0.80) | ||
OB at T3 (mm) | 29.83 | 23.64 | 0.14 |
0.42 (0.50) | 0.18 (0.39) | ||
Posttreatment change in OB (T3 − T2) (mm) | 29.38 | 24.04 | 0.21 |
0.29 (0.55) | −0.07 (0.90) | ||
Crowding at T2 (mm) | 26.50 | 26.50 | 1.00 |
0.00 (0.00) | 0.00 (0.00) | ||
Crowding at T3 (mm) | 25.19 | 27.63 | 0.56 |
0.13 (0.45) | 0.25 (0.59) | ||
Posttreatment change in crowding (T3 − T2) (mm) | 25.19 | 27.63 | 0.56 |
0.13 (0.45) | 0.25 (0.59) | ||
Dental midline at T2 (mm) | 26.50 | 26.50 | 1.00 |
0.00 (0.00) | 0.00 (0.00) | ||
Dental midline at T3 (mm) | 26.00 | 26.93 | 0.83 |
0.00 (0.00) | 0.04 (0.19) | ||
Posttreatment change in dental midline (T3 − T2) (mm) | 26.00 | 26.93 | 0.83 |
0.00 (0.00) | 0.04 (0.19) | ||