title: Effects of activator treatment--evidence for the occurrence of two different types of reaction.
mesh_terms: D000202:Activator Appliances / Q000009:adverse effects*; D002508:Cephalometry; D002648:Child; D005145:Face / Q000033:anatomy & histology; D005260:Female; D006801:Humans; D008137:Longitudinal Studies; D008297:Male; D008312:Malocclusion, Angle Class II / Q000503:physiopathology; D008445:Maxillofacial Development; D009968:Orthodontic Appliances, Removable / Q000009:adverse effects*; D012737:Sex Factors