title: Canine retraction: a photoelastic study.
mesh_terms: D003481:Cuspid / Q000502:physiology*; D004867:Equipment Design; D006801:Humans; D008953:Models, Anatomic; D008954:Models, Biological; D009967:Orthodontic Appliances; D013314:Stress, Mechanical; D014087:Tooth Movement Techniques / Q000295:instrumentation