[Survey of the prognostic elements concerning the efficacy of the activator in Angle Class II occlusion].

Two multiple regression formula allow the prediction of the result for activator treatment concerning Class II occlusion. The accuracy is good on 63% of patients. The first one uses the incisal oberbite and overjet, and the height of the ramus; the other one uses the motivation of the patient before the beginning of treatment and the height of the ramus.