Nowak Clara-Marie, Othman Ahmed, Ströbele Dragan-Alexander, von See Constantin
Researcher in the digital technologies in dentistry and CAD/CAM department- Danube Private University- Austria.
Assistant Professor, Research Center for Digital Technologies in Dentistry and CAD/CAM, Department of Dentistry, Faculty of Medicine and Dentistry, Danube Private University, 3500 Krems, Austria.
J Clin Exp Dent. 2022 Jun 1;14(6):e457-e463. doi: 10.4317/jced.59569. eCollection 2022 Jun.
The purpose of the present study is to mechanically evaluate and compare the forces over 12 hours on different orthodontic aligners manufactured by Polyethylene terephthalate glycol (PETG).
Twelve orthodontic aligner specimens will be produced by a thermoforming laboratory vacuum machine. All specimens will be divided into two equal groups, group A representing Duran (Scheu Dental GmbH, Iserlohn, Germany) and group B representing Erkodur (Erkodent, Pfalzgrafenweiler, Germany). These specimens will be fabricated via CAD/CAM technology by scanning a Frasaco model (Henry Schein Dental, Gallin, Germany) using D 800 (3Shape, Copenhagen, Denmark) and printed via a Varseo S machine using Varseo ModelWax material (BEGO, Bremen, Germany). Group A specimens are manufactured by a Twinster thermoforming machine (Scheu Dental GmbH, Iserlohn, Germany) while group B is produced using Erkoform thermoforming machine (Erkodent, Pfalzgrafenweiler, Germany). Afterwards, a tooth will be removed from the printed model and replaced by an ivory tooth (Henry Schein Dental, Gallin, Germany) to apply forces at a predicted measured centre of resistance. The universal testing machine Z010 (ZwickRoell, Ulm, Germany) will be used for mechanical testing with 0.3 mm displacement over 12 hours. Statistical analysis was performed using Sigmaplot 13.0 (Systat Software GmbH, Erkrath, Germany). Behaviours over time were analysed using R2-regression analysis (SPSS 26.0, IBM SPSS Statistics, Armonk, USA).
There is no statistically significant difference in the maximum force between both groups (=0.071). The mechanical testing over 12 hours showed cubic properties.
The PETG material has no influence on the produced mechanical forces regardless of the manufacturing company. The forces over time showed no tendency towards a lower boundary of force. Mechanical testing, CAD/CAM, orthodontics, thermoplastic aligner materials.
本研究的目的是对由聚对苯二甲酸乙二醇酯二醇（PETG）制造的不同正畸矫治器在12小时内的受力情况进行力学评估和比较。
通过热成型实验室真空机制作12个正畸矫治器样本。所有样本将被平均分为两组，A组代表杜兰（德国伊瑟隆的朔伊牙科有限公司），B组代表埃科杜尔（德国普法尔茨格拉芬魏勒的埃科登特公司）。这些样本将通过CAD/CAM技术制作，使用D 800（丹麦哥本哈根的3Shape公司）扫描弗拉萨科模型（德国加林的亨利·施恩牙科公司），并使用瓦尔塞奥模型蜡材料（德国不来梅的贝戈公司）通过瓦尔塞奥S机器打印。A组样本由双斯特热成型机（德国伊瑟隆的朔伊牙科有限公司）制造，而B组样本使用埃尔科福热成型机（德国普法尔茨格拉芬魏勒的埃科登特公司）制造。之后，从打印模型中移除一颗牙齿，并用一颗象牙牙（德国加林的亨利·施恩牙科公司）替换，以便在预测的测量阻力中心施加力。将使用万能试验机Z010（德国乌尔姆的兹维克-勒尔公司）在12小时内以0.3毫米的位移进行力学测试。使用西格玛绘图软件13.0（德国埃尔克拉特的系统统计软件有限公司）进行统计分析。使用R2回归分析（美国阿蒙克的IBM SPSS Statistics公司的SPSS 26.0）分析随时间的行为。
两组之间的最大力没有统计学上的显著差异（=0.071）。12小时的力学测试显示出立方特性。
无论制造公司如何，PETG材料对产生的机械力没有影响。随时间的力没有显示出趋向于力的下限的趋势。力学测试、CAD/CAM、正畸学、热塑性矫治器材料。
