“…Factors that could interfere on treatment duration include sex 11 , pretreatment ANB value 11,27 overbite 27 , crowding 2,27 , extractions 2,11,27 , time between appointments 2 , treatment phases 29 , age 10,20 , overjet 6,20 , technique 26 , patient compliance (including missed appointments and debonds) 16,20,27 public or private practice 30 , oral hygiene 12,27 , scholar grades 12 , caries 12 , restorations 12 , arch coordination 12 , parent's occupation 12 .…”