Department of Orthodontics, Bauru Dental School, University of São Paulo, Bauru, Brazil.
Department of Orthodontics, Guarulhos University UNG, Guarulhos, Brazil.
Orthod Craniofac Res. 2021 Aug;24(3):370-378. doi: 10.1111/ocr.12447. Epub 2020 Dec 14.
The present study aimed to evaluate and compare the long-term stability of Class II correction with the Pendulum or Jones jig followed by fixed appliances.
Group 1 comprised 20 Class II malocclusion patients with a mean initial age of 13.97 years (SD = 1.57), treated with Pendulum and fixed appliances for a mean period of 4.72 years (SD = 0.98), and mean long-term post-treatment evaluation of 4.72 years (SD = 0.97). Group 2 consisted of 18 Class II patients with a mean initial age of 13.19 years (SD = 1.26), treated with Jones jig and fixed appliances for a mean period of 3.96 years (SD = 0.92). Mean long-term post-treatment time was 5.50 years (SD = 1.57).
Lateral cephalograms were evaluated at three stages: initial (T1), final (T2) and long-term post-treatment (T3). Intragroup comparisons were performed with repeated measures ANOVA and Tukey's test and intergroup comparisons with independent t test.
Many treatment changes were observed in both groups. From the long-term post-treatment periods, there was stability for most of the variables. Maxillary second molars and mandibular first molars extruded in the Jones jig group and slightly intruded in the Pendulum appliance group. The nasolabial angle decreased in the Pendulum group and increased in the Jones jig group.
The correction of a Class II malocclusion was shown to be stable with similar long-term post-treatment results with Pendulum or Jones jig followed by fixed orthodontic appliances.
本研究旨在评估和比较使用 Pendulum 或 Jones 夹具联合固定矫治器治疗 II 类错颌的长期稳定性。
第 1 组包括 20 名平均初始年龄为 13.97 岁（标准差=1.57）的 II 类错颌患者，使用 Pendulum 和固定矫治器治疗，平均治疗时间为 4.72 年（标准差=0.98），平均长期治疗后评估时间为 4.72 年（标准差=0.97）。第 2 组由 18 名平均初始年龄为 13.19 岁（标准差=1.26）的 II 类错颌患者组成，使用 Jones 夹具和固定矫治器治疗，平均治疗时间为 3.96 年（标准差=0.92）。平均长期治疗后时间为 5.50 年（标准差=1.57）。
在三个阶段评估侧位头颅侧位片：初始（T1）、最终（T2）和长期治疗后（T3）。使用重复测量方差分析和 Tukey 检验进行组内比较，使用独立 t 检验进行组间比较。
两组都观察到了许多治疗变化。从长期治疗后期间来看，大多数变量都保持稳定。上颌第二磨牙和下颌第一磨牙在 Jones 夹具组中出现外倾，在 Pendulum 矫治器组中略出现内倾。鼻唇角在 Pendulum 组中减小，在 Jones 夹具组中增大。
使用 Pendulum 或 Jones 夹具联合固定矫治器治疗 II 类错颌的矫正结果在长期治疗后是稳定的，具有相似的结果。
