Skip to main content

Advertisement

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)
  1. AP, anteroposterior; OJ, overjet; OB, overbite; T2, posttreatment; T3, long-term posttreatment.