Effects of angle Class II, division 1 treatment with jumping-the-bite appliances. A longitudinal study

The present study investigated treatment effects in patients with Angle Class II, Division 1 malocclusions treated with jumping-the-bite appliances on the basis of cast evaluation and lateral cephalometrics.

A significant reduction in overjet (p < 0.001) and overbite (p < 0.01) occurred during the course of treatment. A significant reduction in the SNA-angle (p < 0.001) and increase in the SNB-angle (p < 0.001) led to a reduced ANB-angle (p < 0.001). The treatment effect on the maxilla was greater than on the mandible. A slight posterior rotation of the maxilla (p < 0.05) occurred whereas the other vertical relations did not change significantly. The upper incisors were significantly retruded (p < 0.001) while the lower incisors were increasingly protruded (p < 0.001). The interincisal angle was not markedly altered.