The bimetric system.
D000293:Adolescent; D002648:Child; D004867:Equipment Design; D005115:Extraoral Traction Appliances; D006801:Humans; D008297:Male; D009967:Orthodontic Appliances; D009969:Orthodontic Wires; D014087:Tooth Movement Techniques / Q000295:instrumentation / Q000379:methods*