Condo' Roberta, Pazzini Luca, Cerroni Loredana, Pasquantonio Guido, Lagana' Giuseppina, Pecora Alessandro, Mussi Valentina, Rinaldi Antonio, Mecheri Barbara, Licoccia Silvia, Maiolo Luca
Department of Clinical Sciences and Translational Medicine, University of Rome "Tor Vergata", Via Montpellier.
Institute for Microelectronics and Microsystems -National Research Council (IMM-CNR) Via del Fosso del Cavaliere.
Dent Mater J. 2018 Sep 30;37(5):835-842. doi: 10.4012/dmj.2017-323. Epub 2018 Jul 12.
Aim of this in vitro study was to analyze structural properties of two different polymeric orthodontic aligners, Exceed30 (EX30) and Smart Track (LD30), before and after use. Forty patterns of aligners were randomly selected: 20 LD30 and 20 EX30, worn intra-orally for 14±3 days, 22 h/day. From each aligner, 10 specimens were prepared from buccal surfaces of the incisor region by the cutting of samples 5×5 mm under a stereomicroscope. All samples were subjected to Fourier transform infrared spectroscopy, micro-Raman spectroscopy, X-ray diffraction, tensile and indentation strength test. LD30 appeared more homogeneous, with a crystalline fraction lower than EX30 and exhibited a higher elastic behavior and a lower tendency to warp after use than EX30. LD30 demonstrated better adaptability to the dental arch and greater consistency of application of orthodontic forces than produced with EX30. However, both materials showed structural modifications that resulted in increased sample hardness and hyper-plasticity.
本体外研究的目的是分析两种不同的聚合物正畸矫治器Exceed30（EX30）和Smart Track（LD30）使用前后的结构特性。随机选择40个矫治器样本：20个LD30和20个EX30，每天佩戴22小时，口腔内佩戴14±3天。从每个矫治器的切牙区域颊面，在体视显微镜下切割5×5mm的样本，制备10个标本。所有样本均进行傅里叶变换红外光谱、显微拉曼光谱、X射线衍射、拉伸和压痕强度测试。LD30看起来更均匀，结晶分数低于EX30，使用后比EX30表现出更高的弹性行为和更低的翘曲倾向。LD30显示出对牙弓的适应性更好，正畸力施加的一致性比EX30更高。然而，两种材料都显示出结构变化，导致样本硬度增加和超塑性。
