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Long-term stability of surgical-orthodontic open-bite correction.

Maia FA, Janson G, Barros SE, Maia NG, Chiqueto K, Nakamura AY

Department of Orthodontics, University of São Paulo, Bauru, Brazil.

INTRODUCTION: The objective of this study was to evaluate the long-term stability of open-bite surgical-orthodontic correction. METHODS: Thirty-nine patients at an initial mean age of 20.83 years were evaluated cephalometrically at pretreatment (T1), immediately after treatment (T2), and at the last recall (T3), with a mean follow-up time of 8.22 years. The surgical protocol included single-jaw or double-jaw surgery. Because the patients had different anteroposterior malocclusions, the sample was divided into a Class I and Class II (I-II) subgroup (3 Class I, 20 Class II malocclusion patients) and a Class III subgroup (16 patients). The dentoskeletal characteristics of the total sample and the subgroups were compared at T1, T2, and T3 with dependent analysis of variance (ANOVA). RESULTS: Overbite relapse in the posttreatment period was statistically significant in the whole sample and the Class I-II subgroup. Fourteen patients of the whole sample (35.9%) had clinically significant open-bite relapse (negative overbite). CONCLUSIONS: There was a statistically significant open-bite relapse in the overall sample and in the Class I-II subgroup. The clinically significant values of long-term open-bite correction stability were 64.11%, 47.82%, and 87.50% in the overall sample, the Class I-II subgroup, and the Class III subgroup, respectively.

Published 6 September 2010 in Am J Orthod Dentofacial Orthop, 138(3): 254.e1-254.e10; discussion 254-6.
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