Department of Orthodontics, University of São Paulo, Bauru, Brazil.
Am J Orthod Dentofacial Orthop. 2010 Sep;138(3):254.e1-254.e10; discussion 254-6. doi: 10.1016/j.ajodo.2010.03.021.
The objective of this study was to evaluate the long-term stability of open-bite surgical-orthodontic correction.
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).
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).
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.
本研究旨在评估开颌畸形手术-正畸矫正的长期稳定性。
39 名患者的初始平均年龄为 20.83 岁，在治疗前（T1）、治疗后即刻（T2）和最后一次随访（T3）进行了头影测量评估，平均随访时间为 8.22 年。手术方案包括单颌或双颌手术。由于患者存在不同的前后向错位，因此将样本分为 I 类和 II 类（I-II）亚组（3 例 I 类，20 例 II 类错颌患者）和 III 类亚组（16 例）。使用方差分析（ANOVA）对总样本和亚组在 T1、T2 和 T3 的牙颌面特征进行比较。
整个样本和 I-II 类亚组在治疗后阶段的覆颌复发具有统计学意义。整个样本中有 14 名患者（35.9%）出现了临床显著的开颌复发（负覆颌）。
总体样本和 I-II 类亚组存在统计学显著的开颌复发。总体样本、I-II 类亚组和 III 类亚组的长期开颌矫正稳定性的临床显著值分别为 64.11%、47.82%和 87.50%。
