title: An experimental study on the effect of orthodontic force on the maxillary first molars by the Kloehn's headgear.
mesh_terms: D005115:Extraoral Traction Appliances; D006801:Humans; D008437:Maxilla; D008954:Models, Biological; D008963:Molar / Q000502:physiology*; D009968:Orthodontic Appliances, Removable; D013314:Stress, Mechanical; D014087:Tooth Movement Techniques; D014143:Traction