title: Outcomes of two-phase orthodontic treatment of deepbite malocclusions.
abstract: OBJECTIVE
  The objective of this prospective controlled study was to assess the outcomes of two-phase treatment of deepbite patients revaluated at the end of circumpubertal growth, 1 year after the end of a phase-2 treatment.
  
  
  METHODS
  A sample of 58 subjects with deepbite (mean age 9.7 years, overbite greater than 4.5 mm) was treated consecutively with a two-phase protocol. Lateral cephalograms were taken before treatment (T1), at the completion of phase 1 (T2), and 1 year after the completion of phase 2 with fixed appliances (T3, mean age 15.8 years). The T1-T2, T2-T3, and T1-T3 changes were compared with those of the 29 subjects (mean age at T1 = 9.1 years) with untreated deepbite (t-tests for independent samples). Prevalence rates for improved overbite during the T1-T3 interval and for corrected overbite at T3 were contrasted in the treated vs untreated groups (z tests on proportions).
  
  
  RESULTS
  Overbite was reduced by 1.9 mm in the treated group as a result of overall treatment; this group also displayed a significant reduction in the interincisal angulation (-6.6°) due to a significant proclination of upper incisors (4.1°) and a significant increase in the projection of the lower incisors (2.0 mm).
  
  
  CONCLUSIONS
  The average amount of deepbite correction 1 year into retention was modest, and it was mainly due to a significant proclination of the incisors. The prevalence rate of subjects with a corrected overbite in the treated sample at T3 (74%) was not significantly different from that of the untreated sample (52%).
authors.affiliation: Department of Orthodontics, University of Florence, Italy.
authors.forename: Lorenzo
authors.initials: L
authors.lastname: Franchi
authors.forename: Tiziano
authors.initials: T
authors.lastname: Baccetti
authors.forename: Veronica
authors.initials: V
authors.lastname: Giuntini
authors.forename: Caterina
authors.initials: C
authors.lastname: Masucci
authors.forename: Andrea
authors.initials: A
authors.lastname: Vangelisti
authors.forename: Efisio
authors.initials: E
authors.lastname: Defraia
mesh_terms: D016022:Case-Control Studies; D002508:Cephalometry; D002648:Child; D003818:Dentition, Mixed; D016002:Discriminant Analysis; D005260:Female; D006801:Humans; D008297:Male; D009967:Orthodontic Appliances; D009971:Orthodontics, Corrective / Q000295:instrumentation* / Q000379:methods*; D057887:Overbite / Q000628:therapy*; D011379:Prognosis; D011446:Prospective Studies; D016896:Treatment Outcome