Treatment and posttreatment effects of quad-helix/crib therapy of dentoskeletal open bite.

To investigate the effects of the quad-helix/crib (Q-H/C) appliance in subjects with thumb-sucking habits and dentoskeletal open bite at 2 years after the end of active treatment.
The records of 21 subjects treated with the Q-H/C appliance were compared with a control group of 21 untreated subjects with similar vertical relationships. Lateral cephalograms were obtained before treatment (T1; mean age 8.4 +/- 1.4 years) and at about 2 years after treatment (T2; mean age 11.7 +/- 1.9 years) and analyzed. Mean treatment duration was 1.5 years +/- 7 months. The T2-T1 changes in the two groups were compared with a nonparametric test for independent samples.
The mean increase in overbite during Q-H/C therapy (4.1 mm) represented an overcorrection of the amount of anterior open bite at T2. Both the maxillary and mandibular incisors showed significantly greater extrusion in the Q-H/C group than in the control group. The treated group showed a greater downward rotation (1.8 degrees ) of the palatal plane than did the control group. This change was associated with a clinically significant reduction in the palatal plane/mandibular plane angle (-2.5 degrees ) in the Q-H/C group. The upper lip showed significant retraction relative to the E-plane in the treated group (3.6 mm) compared with the controls.
The Q-H/C appliance was effective in correcting dental open bite in 85% of the growing subjects with thumb-sucking habits and dentoskeletal open bites. Correction of anterior open bite was associated with a clinically significant improvement in maxillomandibular vertical skeletal relationships.
AuthorsPaola Cozza, Manuela Mucedero, Tiziano Baccetti, Lorenzo Franchi
JournalThe Angle orthodontist (Angle Orthod) Vol. 77 Issue 4 Pg. 640-5 (Jul 2007) ISSN: 0003-3219 [Print] United States
PMID17605486 (Publication Type: Journal Article)
  • Case-Control Studies
  • Cephalometry (statistics & numerical data)
  • Child
  • Female
  • Fingersucking (adverse effects)
  • Humans
  • Male
  • Open Bite (etiology, therapy)
  • Orthodontic Appliances
  • Palatal Expansion Technique (instrumentation)
  • Statistics, Nonparametric
  • Treatment Outcome
  • Vertical Dimension

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