Objective: 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. Materials and Methods: 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. Results: 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. Conclusions: 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.

Cozza, P., Mucedero, M., Baccetti, T., Franchi, L. (2007). Treatment and posttreatment effects of quad-helix/crib therapy of dentoskeletal open bite. ANGLE ORTHODONTIST, 77(4), 640-645 [10.2319/062106-252].

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

COZZA, PAOLA;
2007-01-01

Abstract

Objective: 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. Materials and Methods: 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. Results: 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. Conclusions: 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.
Pubblicato
Rilevanza internazionale
Articolo
Sì, ma tipo non specificato
Settore MED/28 - Malattie Odontostomatologiche
English
Con Impact Factor ISI
article; case control study; cephalometry; child; female; habit; human; instrumentation; male; malocclusion; nonparametric test; orthodontic device; orthodontics; statistics; tooth occlusion; treatment outcome; Case-Control Studies; Cephalometry; Child; Female; Fingersucking; Humans; Male; Open Bite; Orthodontic Appliances; Palatal Expansion Technique; Statistics, Nonparametric; Treatment Outcome; Vertical Dimension
Cozza, P., Mucedero, M., Baccetti, T., Franchi, L. (2007). Treatment and posttreatment effects of quad-helix/crib therapy of dentoskeletal open bite. ANGLE ORTHODONTIST, 77(4), 640-645 [10.2319/062106-252].
Cozza, P; Mucedero, M; Baccetti, T; Franchi, L
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2108/36611
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