Palone Mario, Longo Mattia, Arveda Niki, Nacucchi Michele, Pascalis Fabio De, Spedicato Giorgio Alfredo, Siciliani Giuseppe, Lombardo Luca
Postgraduate School of Orthodontics, University of Ferrara, Ferrara, Italy.
Division for Sustainable Materials, Research Centre of Brindisi, Brindisi, Italy.
Korean J Orthod. 2021 Mar 25;51(2):135-141. doi: 10.4041/kjod.2021.51.2.135.
To assess the effects of thermoforming on aligner thickness and gap width in six aligner systems with the same nominal thickness.
Six passive upper aligners of different brands were adapted to a single printed cast. Each sample was evaluated with high-resolution micro-computed tomography. To investigate aligner thickness and gap width, two-dimensional (2D) analysis was conducted assessing the effects of the following variables: tooth type (central incisor, canine, and first molar), 2D reference points, and aligner type. Data were analyzed and compared using analysis of variance and Tukey's post-hoc tests ( < 0.05).
Tooth type, dental region, and aligner type affected both the gap width and aligner thickness. The aligner thickness remained moderately stable across the arch only in the F22.
All thermoformed samples displayed smaller aligner thickness and gap width at anterior teeth and both gingival and coronal centers than at posterior teeth and occlusal surfaces.
评估热成型对六种标称厚度相同的矫治器系统中矫治器厚度和间隙宽度的影响。
将六个不同品牌的被动式上颌矫治器适配到单个打印模型上。每个样本均采用高分辨率微计算机断层扫描进行评估。为了研究矫治器厚度和间隙宽度，进行二维（2D）分析，评估以下变量的影响：牙齿类型（中切牙、尖牙和第一磨牙）、二维参考点和矫治器类型。使用方差分析和Tukey事后检验（<0.05）对数据进行分析和比较。
牙齿类型、牙区和矫治器类型均影响间隙宽度和矫治器厚度。仅在F22中，矫治器厚度在整个牙弓上保持适度稳定。
所有热成型样本在前牙以及牙龈和牙冠中心处显示出比后牙和咬合面更小的矫治器厚度和间隙宽度。
