title: The question of friction.
authors.forename: Robert G
authors.initials: RG
authors.lastname: Keim
mesh_terms: D001696:Biomechanical Phenomena; D017276:Friction; D006801:Humans; D016382:Orthodontic Appliance Design; D016910:Orthodontic Brackets; D009969:Orthodontic Wires; D013314:Stress, Mechanical; D013499:Surface Properties; D014087:Tooth Movement Techniques / Q000295:instrumentation