title: [Two class II malocclusion cases treated with FKO with two kinds of expansion springs built in].
mesh_terms: D000202:Activator Appliances; D002648:Child; D003724:Dental Arch / Q000473:pathology; D005260:Female; D006801:Humans; D008297:Male; D008310:Malocclusion / Q000473:pathology / Q000628:therapy*; D009968:Orthodontic Appliances, Removable; D009971:Orthodontics, Corrective; D010155:Palatal Expansion Technique