Conservation of critical extraction space: the Begg mechanism.
D000293:Adolescent; D001641:Bicuspid; D002648:Child; D005260:Female; D006801:Humans; D008310:Malocclusion / Q000628:therapy*; D009971:Orthodontics, Corrective; D014079:Tooth Eruption, Ectopic / Q000628:therapy; D014081:Tooth Extraction