The purpose of this study was to evaluate the effects of activator in Class II division 1 malocclusions.
The ideal types of cases for such treatment were nonextraction Class II Division 1 malocclusion, with procumbent maxillary incisors, lingually tipped mandibular incisors, a deep overbite, a fiat to average mandibular plane inclination, and
mandibular
skeletal retrusion.
There was a variation in individual patients response to treatment but the correction was mainly achieved by optimizing mandibular growth, redirection of maxillary growth, lingual tipping of the maxillary incisors, labial tipping of the
mandibular
incisors, mesial and vertical eruption of mandibular molars. A combination of orthodontic(70%) and orthopedic(30%) effects provided the correction necessary for successful treatment.
Activator could be used to correct dentoalveolar and skeletal Class II malocclusions. Skeletal corrections were best obtained in cases in which a favorable direction of growth is expected and an increased lower anterior facial height would not be
detrimental to the profile.
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