Department of Orthodontics, Bauru Dental School, University of São Paulo, Bauru, São Paulo, Brazil.
Am J Orthod Dentofacial Orthop. 2010 Feb;137(2):164.e1-6; discussion 164-5. doi: 10.1016/j.ajodo.2009.06.017.
The purpose of this retrospective study was to compare the long-term stability of maxillary incisor alignment in patients treated with and without rapid maxillary expansion (RME).
The sample comprised 48 subjects with Class I and Class II malocclusions, treated without extractions with fixed edgewise appliances, divided into 2 groups according to the treatment protocol: group 1 comprised 25 patients (15 girls, 10 boys) at a mean initial age of 13.53 years (SD, 1.63), who had RME during orthodontic treatment. Group 2 comprised 23 patients (13 girls, 10 boys) at a mean initial age of 13.36 years (SD, 1.81 years), treated with fixed appliances without RME. Maxillary dental cast measurements were obtained at the pretreatment, posttreatment, and long-term posttreatment stages. Variables assessed were the irregularity index and maxillary arch dimensions. Intergroup comparisons were made with independent t tests.
Greater transverse increases were found during treatment in the group treated with RME. However, during the long-term posttreatment period, no significant difference was observed in the amount of incisor crowding relapse between the groups.
RME did not influence long-term maxillary anterior alignment stability.
本回顾性研究的目的是比较上颌切牙在接受和不接受快速扩弓（RME）治疗的患者中的长期稳定性。
该样本包括 48 名 I 类和 II 类错颌畸形患者，采用固定直丝弓矫治器治疗，不进行拔牙，根据治疗方案分为 2 组：组 1 包括 25 名患者（15 名女孩，10 名男孩），平均初始年龄为 13.53 岁（SD，1.63），在正畸治疗期间接受 RME。组 2 包括 23 名患者（13 名女孩，10 名男孩），平均初始年龄为 13.36 岁（SD，1.81 岁），接受固定矫治器治疗而不进行 RME。在治疗前、治疗后和长期治疗后阶段获得上颌牙模测量值。评估的变量是不规则指数和上颌弓尺寸。采用独立 t 检验进行组间比较。
接受 RME 治疗的组在治疗期间发现横向增加较大。然而，在长期治疗后阶段，两组之间的切牙拥挤复发量没有观察到显著差异。
RME 不影响上颌前牙长期稳定性。
