Stability of quad-helix/crib therapy in dentoskeletal open bite: a long-term controlled study.

Abstract

INTRODUCTION:

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: Manuela Mucedero, Lorenzo Franchi, Veronica Giuntini, Andrea Vangelisti, James A McNamara Jr, Paola Cozza
• Journal: American journal of orthodontics and dentofacial orthopedics : official publication of the American Association of Orthodontists, its constituent societies, and the American Board of Orthodontics (Am J Orthod Dentofacial Orthop) Vol. 143 Issue 5 Pg. 695-703 (May 2013) ISSN: 1097-6752 [Electronic] United States
• PMID: 23631971 (Publication Type: Controlled Clinical Trial, Journal Article)
• Copyright: Copyright © 2013 American Association of Orthodontists. Published by Mosby, Inc. All rights reserved.

Topics

• Adolescent
• Cephalometry
• Child
• Female
• Fingersucking (therapy)
• Follow-Up Studies
• Humans
• Longitudinal Studies
• Male
• Matched-Pair Analysis
• Open Bite (etiology, therapy)
• Orthodontic Appliance Design
• Orthodontics, Corrective (instrumentation, methods)
• Palate, Hard
• Treatment Outcome