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  • Title: Stability of quad-helix/crib therapy in dentoskeletal open bite: a long-term controlled study.
    Author: Mucedero M, Franchi L, Giuntini V, Vangelisti A, McNamara JA, Cozza P.
    Journal: Am J Orthod Dentofacial Orthop; 2013 May; 143(5):695-703. PubMed ID: 23631971.
    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.
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