Directional forces.
D000222:Adaptation, Physiological; D002508:Cephalometry; D006801:Humans; D008310:Malocclusion / Q000628:therapy*; D008445:Maxillofacial Development; D009967:Orthodontic Appliances; D009971:Orthodontics, Corrective; D014143:Traction / Q000295:instrumentation