Private Practice, Isfahan, Iran.
University of Minas Gerais, Structural Engineering School, Minas Gerais, Brazil.
Int Orthod. 2020 Jun;18(2):317-329. doi: 10.1016/j.ortho.2020.02.004. Epub 2020 Mar 31.
The aim of this study was to determine long-term skeletal and dental changes in tooth-anchored versus Dresden bone-anchored rapid maxillary expansion using CBCT images in adolescents.
In all, 29 adolescent patients (11-17 years of age) needing skeletal expansion were randomly allocated to two different groups treated by either a Dresden bone-anchored expander or a conventional hyrax expander. Patients included did not have previous orthodontic treatment, were non-syndromic and had all teeth present in mouth. CBCT images were taken before expansion and two or more years after expansion. An independent T-test was used to determine the statistical significance between treatment groups and paired T-test was used to compare the results before and after expansion in each group.
Neither treatment group showed overall long-term different skeletal and dental changes in the transverse, anterior-posterior and vertical planes (P<0.05). Both treatment groups showed mild asymmetric skeletal expansion, but these were clinically insignificant.
Both expanders had similar skeletal and dental results. The greatest changes were in the transverse plane. Changes in vertical and anterior-posterior were negligible.
本研究旨在通过 CBCT 图像确定青少年牙支抗与德勒斯登骨支抗快速上颌扩张的长期骨骼和牙齿变化。
共纳入 29 名需要骨骼扩张的青少年患者（11-17 岁），随机分为两组，分别接受德勒斯登骨支抗扩张器或常规 Hyrax 扩弓器治疗。纳入患者既往无正畸治疗，非综合征，口内均有全部牙齿。在扩张前和扩张后 2 年以上拍摄 CBCT 图像。采用独立 T 检验比较两组间的统计学差异，采用配对 T 检验比较每组治疗前后的结果。
两组治疗组在横向、前后和垂直平面均未显示出总体长期的不同骨骼和牙齿变化（P<0.05）。两组治疗组均表现出轻度的不对称性骨骼扩张，但临床意义不大。
两种扩弓器均具有相似的骨骼和牙齿效果。最大的变化发生在横断面上。垂直和前后方向的变化可以忽略不计。
