title: Stability of quad-helix/crib therapy in dentoskeletal open bite: a long-term controlled study.
abstract: BACKGROUND
  The purpose of this study was to evaluate the long-term stability of quad-helix/crib treatment in subjects with dentoskeletal open bite.
  
  
  METHODS
  Twenty-eight subjects (11 boys, 17 girls; mean age, 8.2 ± 1.3 years) were treated consecutively with quad-helix/crib appliances. The patients were reevaluated at the end of active treatment with the quad-helix/crib (mean age, 9.7 ± 1.6 years) and at least 5 years after the completion of treatment (mean age, 14.6 ± 1.9 years). A control group of 20 untreated subjects with the same dentoskeletal disharmony was used for the statistical comparison (Mann-Whitney U test).
  
  
  RESULTS
  In the long term, the quad-helix/crib group showed a significant reduction in the ANB angle (-1.3°), a downward rotation of the palatal plane (1.8°), a greater increase in overbite (2.1 mm), and a decrease in overjet (-1.5 mm) when compared with the controls.
  
  
  CONCLUSIONS
  In the long term, the use of the quad-helix/crib appliance led to successful outcomes in about 93% of the patients considered. Correction of dentoskeletal open bite was associated with a clinically significant downward rotation of the palatal plane.
authors: Department of Orthodontics, University of Rome Tor Vergata, Rome, Italy.
authors: Manuela
authors: M
authors: Mucedero
authors: Lorenzo
authors: L
authors: Franchi
authors: Veronica
authors: V
authors: Giuntini
authors: Andrea
authors: A
authors: Vangelisti
authors: James A
authors: JA
authors: McNamara
authors: Paola
authors: P
authors: Cozza
mesh_terms: D000293:Adolescent; D002508:Cephalometry; D002648:Child; D005260:Female; D005386:Fingersucking / Q000628:therapy*; D005500:Follow-Up Studies; D006801:Humans; D008137:Longitudinal Studies; D008297:Male; D016555:Matched-Pair Analysis; D024343:Open Bite / Q000209:etiology / Q000628:therapy*; D016382:Orthodontic Appliance Design; D009971:Orthodontics, Corrective / Q000295:instrumentation* / Q000379:methods; D021362:Palate, Hard; D016896:Treatment Outcome