title: The effects of Begg treatment on the lower labial segment in Class II cases.
mesh_terms: D002986:Clinical Trials as Topic; D004812:Epidemiologic Methods; D006801:Humans; D007180:Incisor / Q000033:anatomy & histology*; D008137:Longitudinal Studies; D008310:Malocclusion; D008334:Mandible; D009971:Orthodontics, Corrective