[Changes in maxillary protrusion after treatment with Begg's technic. Evaluation by factor analysis].
D002508:Cephalometry; D006801:Humans; D008310:Malocclusion / Q000473:pathology / Q000628:therapy*; D008437:Maxilla / Q000033:anatomy & histology*; D014087:Tooth Movement Techniques / Q000379:methods*