 This study found that movements of the lower incisors in relation to apog were more related to changes in the angulation of the apog line itself than to the movements of the incisors on basal bone, and that in cases where considerable forward movement had occurred at Pagonian and deep anterior overbites had been reduced, lower incisor movements on basal bone may occur in the opposite direction to those in relation to the apog line due to complex interactions between vertical and horizontal. Changes occurring in both point A and Pagonian. This article was authored by Woods-Michael.