title: Theoretical considerations of headgear therapy: a literature review. 2. Clinical response and usage.
mesh_terms: D001696:Biomechanical Phenomena; D005115:Extraoral Traction Appliances; D006801:Humans; D008962:Models, Theoretical; D009967:Orthodontic Appliances; D009968:Orthodontic Appliances, Removable; D014087:Tooth Movement Techniques