An Jung-Sub, Seo Bo-Yeon, Ahn Sug-Joon
Department of Orthodontics, Seoul National University Dental Hospital, Seoul, Korea.
Dental Research Institute and Department of Orthodontics, School of Dentistry, Seoul National University, Seoul, Korea.
Korean J Orthod. 2022 Mar 25;52(2):131-141. doi: 10.4041/kjod.2022.52.2.131.
The purpose of this study was to compare the differences in dentoskeletal and soft tissue changes following conventional tooth-borne rapid maxillary expansion (RME) between adolescents and adults.
Dentoskeletal and soft tissue variables of 17 adolescents and 17 adults were analyzed on posteroanterior and lateral cephalograms and frontal photographs at pretreatment (T1) and after conventional RME using tooth-borne expanders (T2). Changes in variables within each group between T1 and T2 were analyzed using Wilcoxon signed-rank test. Mann-Whitney test was used to determine the differences in the pretreatment age, expansion and post-expansion durations, and dentoskeletal and soft tissue changes after RME between the groups. Spearman's correlation between pretreatment age and transverse dentoskeletal changes in the adolescent group was calculated.
Despite similar amounts of expansion at the crown level in both groups, the adult group underwent less skeletal expansion with less intermolar root expansion after RME than the adolescent group. The skeletal vertical dimension increased significantly in both groups without significant intergroup difference. The anteroposterior position of the maxilla was maintained in both groups, while a greater backward displacement of the mandible was evident in the adult group than that in the adolescent group after RME. The soft tissue alar width increased in both groups without a significant intergroup difference. In the adolescent group, pretreatment age was not significantly correlated with transverse dentoskeletal changes.
Conventional RME may induce similar soft tissue changes but different dentoskeletal changes between adolescents and adults.
本研究旨在比较青少年和成年人在接受传统牙支持式快速上颌扩弓（RME）后牙颌面及软组织变化的差异。
对17名青少年和17名成年人的牙颌面及软组织变量进行分析，在治疗前（T1）以及使用牙支持式扩弓器进行传统RME后（T2），拍摄正位和侧位头影测量片以及正面照片。使用Wilcoxon符号秩检验分析每组在T1和T2之间变量的变化。采用Mann-Whitney检验确定两组之间治疗前年龄、扩弓及扩弓后持续时间以及RME后牙颌面和软组织变化的差异。计算青少年组治疗前年龄与横向牙颌面变化之间的Spearman相关性。
尽管两组在牙冠水平的扩弓量相似，但成年组在RME后骨骼扩弓较少，磨牙间牙根扩弓也少于青少年组。两组的骨骼垂直维度均显著增加，组间差异不显著。两组上颌的前后位置均得以维持，而成年组在RME后下颌向后移位比青少年组更明显。两组软组织鼻翼宽度均增加，组间差异不显著。在青少年组中，治疗前年龄与横向牙颌面变化无显著相关性。
传统RME可能在青少年和成年人中引起相似的软组织变化，但牙颌面变化不同。
