Department of Orthodontics, Bauru Dental School, University of São Paulo, Bauru, São Paulo, Brazil.
Department of Orthodontics, Bauru Dental School, University of São Paulo, Bauru, São Paulo, Brazil.
Am J Orthod Dentofacial Orthop. 2023 May;163(5):609-617. doi: 10.1016/j.ajodo.2021.10.017. Epub 2023 Feb 11.
The objective of this study was to compare the long-term cephalometric stability after successful therapy of nonextraction Class II malocclusion with elastics and with headgear.
The sample comprised 43 patients with Class II malocclusion and was divided into 2 groups. The elastic group (EG) consisted of 20 patients treated with fixed appliances associated with Class II elastics, and the headgear group (HG) consisted of 23 patients treated with fixed appliances and extraoral headgear. Pretreatment, posttreatment, and long-term posttreatment lateral radiographs were evaluated; t tests were used to compare the long-term posttreatment changes between the groups.
The groups were matched regarding initial age, time of long-term posttreatment evaluation, initial malocclusion severity, quality of treatment result, and all pretreatment cephalometric variables. Intergroup comparisons of long-term posttreatment changes showed that the HG group presented significantly greater mandibular protrusion, occlusal plane angle decrease, and maxillary molar mesialization. However, long-term posttreatment stability was similar in overjet, overbite, and molar relationships.
Nonextraction Class II malocclusion treatment with elastics or extraoral headgear have similar long-term posttreatment stability.
本研究的目的是比较使用弹性牵引和头帽治疗成功的非拔牙 II 类错[牙合]畸形的长期头影测量稳定性。
该样本包括 43 名 II 类错[牙合]畸形患者，分为 2 组。弹性组（EG）由 20 名接受固定矫治器联合 II 类弹性牵引治疗的患者组成，头帽组（HG）由 23 名接受固定矫治器和口外头帽治疗的患者组成。评估治疗前、治疗后和长期治疗后侧位片；使用 t 检验比较两组的长期治疗后变化。
两组在初始年龄、长期治疗后评估时间、初始错[牙合]严重程度、治疗效果质量以及所有治疗前头影测量变量方面相匹配。长期治疗后变化的组间比较显示，HG 组下颌前突、牙合平面角减小和上颌磨牙近中移动显著更大。然而，在覆[牙合]、覆盖和磨牙关系方面，长期治疗后稳定性相似。
使用弹性牵引或口外头帽治疗非拔牙 II 类错[牙合]畸形具有相似的长期治疗后稳定性。
