Table 4 Mean values (standard deviation) of study cast measurements of four groups

Spee's curve depth (mm)

3.21 (0.85) a

3.13 (0.65) a

3.32 (0.64) a

3.72 (0.81) a

Overbite (mm)

3.45 (0.48) a

4.01 (0.51) a

3.99 (1.20) a

3.88(0.65) a

Overjet (mm)

7.71 (1.10) a

6.43 (0.69) b, c, d

6.25 (1.75) c, d

6.84 (0.98) d

Molar relationship (mm)

3.59 (0.53) a

3.75 (0.42) a

0.64 (0.30) b

1.92 (1.10) c

Lower anterior crowding (mm)

1.33 (0.86) a

3.60 (0.87) b, d

5.90 (1.06) c

4.03 (0.81) d

Bolton index 3-3 (%)

79.19 (2.36) a

82.18 (2.28) b

79.14 (2.29) a

79.25 (2.30) a

Bolton index 6-6 (%)

91.91 (2.29) a

92.07 (2.19) a

91.90 (2.20) a

91.92 (2.16) a