Scribante Andrea, Gallo Simone, Turcato Benedetta, Trovati Federico, Gandini Paola, Sfondrini Maria Francesca
Unit of Orthodontics and Paediatric Dentistry, Section of Dentistry, Department of Clinical, Surgical, Diagnostic and Paediatric Sciences, University of Pavia, 27100 Pavia, Italy.
Polymers (Basel). 2020 Apr 21;12(4):963. doi: 10.3390/polym12040963.
The aim of this laboratory and clinical study is to determine the reliability of the flowable nanocomposite Filtek Supreme XTE (FL) for the adhesion of orthodontic retainers, compared to highly filled orthodontic resin Transbond XT (XT). Portions of a round section multistranded wire (Ortosmail Krugg) were bonded to 40 bovine incisors with Scotchbond Universal in total-etch modality. For group one (XT, 20 samples), the orthodontic resin was used, whereas in group two (FL, 20 samples), the flowable one. Specimens were placed into a universal testing machine which applied a shear force on retainers with a crosshead speed of one/minute. Shear bond strength (SBS) and adhesive remnant index (ARI) scores were calculated. In the clinical trial, 100 patients requiring a canine-to-canine palatal and lingual retainer were randomly divided into two groups, according to the resin used for bonding procedure: the orthodontic in group one (XT, 50 participants) and the flowable in group two (FL, 50 participants). Monthly visits were carried out over a 24-month follow up to assess any detachment occurring on teeth of both arches. All data were submitted to statistical analysis. In vitro, FL reported a significant lower mean SBS, whereas no significant differences in ARI were reported between the two groups which both showed a major frequency of scores "1" and "2". At the end of the 24-month follow up, FL reported significantly higher failure rates in both arches besides a significantly lower survival rate starting from the sixth month after retainers bonding. According to the results assessed in vitro and clinically, XT would be preferable to FL when performing retainers bonding procedure.
本实验室及临床研究的目的是，与高填料正畸树脂Transbond XT（XT）相比，确定可流动纳米复合材料Filtek Supreme XTE（FL）用于正畸保持器粘结的可靠性。将圆形截面多股钢丝（Ortosmail Krugg）的部分用全酸蚀模式的Scotchbond Universal粘结到40颗牛切牙上。对于第一组（XT，20个样本），使用正畸树脂，而在第二组（FL，20个样本）中，使用可流动树脂。将样本放入万能试验机中，以每分钟一次的十字头速度对保持器施加剪切力。计算剪切粘结强度（SBS）和粘结残留指数（ARI）得分。在临床试验中，100名需要犬齿到犬齿腭侧和舌侧保持器的患者根据粘结过程中使用的树脂随机分为两组：第一组为正畸树脂（XT，50名参与者），第二组为可流动树脂（FL，50名参与者）。在24个月的随访期间每月进行一次复诊，以评估两个牙弓的牙齿上是否发生任何脱落。所有数据均进行统计分析。在体外，FL的平均SBS显著较低，而两组之间在ARI方面未报告显著差异，两组均显示得分“1”和“2”的频率较高。在24个月随访结束时除了从保持器粘结后第六个月开始生存率显著较低外，FL在两个牙弓中的失败率均显著较高。根据体外和临床评估结果，在进行保持器粘结程序时，XT比FL更可取。
