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Eighty-five (45 male and 40 female) skeletal Class II untreated subjects with low (< 27°), average (27°- 36°), and high (> 36°) mandibular plane angles (MP-SN) were selected from the Bolton-Brush and the Burlington Growth Studies. Cephalograms of each subject at ages 9 and 18 were traced, and 28 parameters were measured. The difference in each parameter from ages 9 to 18 was calculated, and...