Objective To determine the positional changes of condyle and mandible in children treated successfully with Frankel function regulator.Methods 30 Angle′s classⅡpatients including 15 boys and 15 girls treated with Frankel function regulator were selected. Superimposition of the pretreatment and posttreatment lateral cephalograms of all the patients was done on the stable bone structure of the anterior cranial base and mandible. Cartesian coordinate systemwas used to measure the positional changes of condyle and mandible over time by computer.Results There was significant inferior displacement of condyle, gonion and pogonion after treatment with reference to stable bone structure of anterior cranial base. Anterior displacement of pogonion in boys was also significant. There was significantly superior and posterior displacement of condyle and posterior displacement of go- nion after treatment with reference to stable bone structure of mandible.Conclusion Frankel function regulator can stimulate condylar growth and do favor to mandibular remolding.
