From: Mechanisms of Class II correction induced by the crown Herbst appliance as a single-phase Class II therapy: 1 year follow-up
Age at T1, years
Age at T2, years
Age at T3, years
Number
Female
Male
Mean (SD)
cHerbst group
40
20
13.6 (1.3)
14.8 (1.4)
15.9 (1.4)
Control group
18
7
11
13.9 (1.6)
14.7 (1.4)
15.7 (1.4)