The Scientific World Journal / 2015 / Article / Tab 2

Research Article

Change of Mandibular Position during Two-Phase Orthodontic Treatment of Skeletal Class II in the Chinese Population

Table 2

(a) Comparison of dentofacial morphology between the population normand the study sample at the start of treatment (T0) and after phase I (T1) and phase II (T2) treatment. (b) Comparison of dentofacial morphology with the population norm and the three subgroups at the start of treatment (T0).
(a)

VariablesPopulation normT0T1T2
MeanSDMeanSDMeanSDMeanSD

Sagittal
 Overjet (mm)4.31.769.8***3.130.6***2.913.90.88
 Wits appraisal (mm)−4.53.003.6***3.58−4.33.340.2***3.06
 Maxillary prognathism
  OLp-A (mm)76.13.8680.2**4.2582.4***4.2283.1***4.25
  S-N-A (°)82.03.5082.63.6983.13.3682.43.12
 Mandibular prognathism
  OLp-Pg (mm)82.34.8879.2**6.7486.0***8.3086.4***8.99
  OLp-B (mm)N/AN/A77.05.9383.67.3483.47.66
  Ar-GnN/AN/A104.05.78112.06.88113.97.73
  S-N-B (°)79.03.0075.1***3.4577.7*3.9377.1**4.31
 Jaw base relationship
  A-Pg (mm)−6.23.381.1***3.76−3.5***5.53−3.3***5.99
  A-N-B (°)3.02.007.5***1.785.4***1.935.3***2.20
 Maxillary incisor
  OLp-is (mm)88.14.5491.84.8993.0***5.3093.7***5.40
 Mandibular incisor
  OLp-ii (mm)83.84.4482.04.7592.4***5.7989.7***5.13
 Maxillary molar
  OLp-ms (mm)55.03.9856.74.3056.05.0760.6***5.30
 Mandibular molar
  OLp-mi (mm)57.74.2654.64.9564.6***6.0264.0***5.88
 Molar relationship
  ms-mi (mm)−2.71.622.1***1.77−8.6***2.33−3.4*2.04
Vertical
 Overbite (mm)2.21.513.22.60−0.1***1.441.00.89
 Upper face height
  N-NL (mm)54.03.5057.2***3.4859.7***3.8960.7***3.55
 Lower face height
  NL-Me (mm)64.04.0065.54.5471.0***5.3472.7***5.52
 Total face height
  NSL-Me (mm)N/AN/A117.86.50126.47.23129.07.16
 Incisor position
  is-NL (mm)28.92.7230.52.8232.9***2.9833.7***3.14
  ii-ML (mm)41.32.7343.9**3.3543.4**3.6844.8***3.72
 Molar position
  msc-NL (mm)21.92.2223.7*2.2523.12.7426.0***3.03
  mic-ML (mm)31.82.4133.22.2535.9***2.5437.8***3.09
 Rotational changes
  NL/NSL (°)9.13.349.82.469.83.009.43.26
  ML/NSL (°)35.35.5734.87.2834.07.4933.68.38

SD: Standard deviation.
, , .
(b)

VariablesPopulation normPositive groupStable groupNegative group
MeanSDMeanSDMeanSDMeanSD

Sagittal
 Overjet (mm)4.31.7610.3***2.548.6***3.4510.3***3.34
 Wits appraisal (mm)−4.53.003.7***2.603.4***2.853.7***5.13
 Maxillary prognathism
  OLp-A (mm)76.13.8680.6***3.9078.24.3081.9***4.04
  SNA (°)82.03.5083.33.8781.43.4583.03.83
 Mandibular prognathism
  OLp-Pg (mm)82.34.8881.05.6577.5**8.0479.0*6.54
  OLp-B (mm)N/AN/A78.25.5475.37.1077.55.21
  Ar-GnN/AN/A104.96.08101.85.07105.46.05
  SNB (°)79.03.0076.4***4.2674.2***3.0774.7***2.83
 Jaw base relationship
  A-Pg (mm)−6.23.38−0.4***2.980.7***4.402.9***3.35
  ANB (°)3.02.006.9***2.037.2***1.508.3***1.65
 Maxillary incisor
  OLp-is (mm)88.14.5492.6***4.6488.63.6494.2***4.89
 Mandibular incisor
  OLp-ii (mm)83.84.4482.34.5980.04.5183.94.80
 Maxillary molar
  OLp-ms (mm)55.03.9856.44.5356.04.6857.73.93
 Mandibular molar
  OLp-mi (mm)57.74.2654.25.0153.65.4456.14.51
 Molar relationship (mm)
  ms-mi (mm)−2.71.622.1***1.812.4***1.701.6***1.88
Vertical
 Overbite (mm)2.21.514.4***1.612.92.932.22.76
 Upper face height
  N-NL (mm)54.03.5056.42.6856.02.2759.2***4.48
 Lower face height
  NL-Me (mm)64.04.0064.34.0764.12.7068.05.63
 Total face height
  NSL-Me (mm)N/AN/A116.65.17114.74.52122.27.40
 Incisor position
  is-NL (mm)28.92.7230.32.8430.02.4831.1*3.27
  ii-ML (mm)41.32.7343.5*2.2142.31.7245.9***4.56
 Molar position
  msc-NL (mm)21.92.2223.5*2.3823.6*1.9623.9**2.59
  mic-ML (mm)31.82.4132.82.2232.81.9834.1**2.51
 Rotational changes
  NL/NSL (°)9.13.348.82.0411.3*2.469.42.33
  ML/NSL (°)35.35.5731.1*8.1135.16.4038.16.00

SD: Standard deviation.
.