title: Effect of application of the Kloehn type headgear on the upper first molar.
mesh_terms: D002648:Child; D005115:Extraoral Traction Appliances; D006801:Humans; D008963:Molar / Q000502:physiology*; D009968:Orthodontic Appliances, Removable; D009971:Orthodontics, Corrective; D009991:Oscillometry / Q000295:instrumentation; D014087:Tooth Movement Techniques; D014159:Transducers / Q000295:instrumentation