title: Functional appliances: which one, when? Part 1--Rationale for selection.
mesh_terms: D000202:Activator Appliances; D000293:Adolescent; D002648:Child; D004867:Equipment Design; D005260:Female; D006801:Humans; D008297:Male; D008310:Malocclusion / Q000628:therapy*; D009968:Orthodontic Appliances, Removable