[The modification of growth with the jumping-the-bite plate compared to other functional orthodontic appliances]

The bite-jumping-appliance BJA is a special functional appliance which affects the upper jaw comparably to activator headgear combinations (SNA angle). Concerning its influence on the lower jaw (SNB angle) the BJA can be compared with the Teuscher activator and the Klammt activator. The change in the inclination of the upper jaw (ANS-PNS to nasion-sella) proved to be negligible because the vector of the force passed through the center of resistance of the upper jaw. The extend of the dental influence was the largest with the activator, the smallest with the Fränkel II appliance. The inclination of the lower incisors (1 to gonion-menton) was hardly affected. The upper incisors were retruded however not be the same extend as with the Teuscher activator which even has torque springs (to avoid the retrusion). The treatment of all the patients ended in all cases excepting those that were treated with an activator in a nearly ideal IIW angle. Our findings encourage us to say that the BJA is an appliance with a far better working mechanism than the working mechanism of other functional appliances.