title: A clinical assessment of light and heavy forces in the closure of extraction spaces.
mesh_terms: D002986:Clinical Trials as Topic; D006801:Humans; D008722:Methods; D009967:Orthodontic Appliances / Q000592:standards*; D009971:Orthodontics, Corrective / Q000592:standards*; D014081:Tooth Extraction; D014086:Tooth Mobility