Albuquerque Cibele Gonçalves de, Correr Américo Bortolazzo, Venezian Giovana Cherubini, Santamaria Milton, Tubel Carlos Alberto, Vedovello Silvia Amélia Scudeler
Department of Orthodontics, Fundação Hermínio Ometto-UNIARARAS, Araras, SP, Brazil.
Department of Restorative Dentistry, Dental Materials Division, Piracicaba Dental School, UNICAMP - Universidade Estadual de Campinas, Piracicaba, SP, Brazil.
Braz Dent J. 2017 Jan-Feb;28(1):40-45. doi: 10.1590/0103-6440201700630.
The aim was to evaluate the flexural strength and the effects of deflection on the surface roughness of esthetic orthodontic wires. The sample consisted of 70 archwire 0.014-inch: polytetrafluorethylene (PTFE)-coated Nickel-Titanium (Niti) archwires (Titanol Cosmetic-TC, Flexy Super Elastic Esthetic-FSE, esthetic Nickel Titanium Wire-ANT); epoxy resin-coated Niti archwires (Spectra-S, Niticosmetic-TEC); gold and rhodium coated Niti (Sentalloy-STC) and a control group (superelastic Niti (Nitinol-NS). The initial roughness was evaluated with a rugosimeter. After that, the wires were submitted to flexural test in an universal testing machine. Each wire was deflected up to 2 mm at a speed of 1 mm/min. After flexural test, the roughness of the wires was evaluted on the same surface as that used for the initial evaluation. The data of roughness and flexural strength were analyzed by one-way ANOVA and Tukey's test (a=0.05). Student t-test compared roughness before and after deflection (a =0.05). The roughness of S and ANT (epoxy resin and PTFE-coated wires, respectively), before and after deflection, was significantly higher than the other groups (p<0.05). Wire deflection significantly increased the roughness of the wires S and STC (p<0.05). The flexural strength of groups FSE and NS (PTFE and uncoated) was higher compared with that of the other groups (p<0.05). We concluded that the roughness and flexural strength of the orthodontic wires does not depend on the type of the esthetic coating, but it is influenced by the method of application of this coating. The deflection can increase the roughness of the esthetic orthodontic wires.
目的是评估美观正畸丝的弯曲强度以及挠曲对其表面粗糙度的影响。样本包括70根0.014英寸的弓丝：聚四氟乙烯（PTFE）涂层的镍钛（Niti）弓丝（Titanol Cosmetic-TC、Flexy Super Elastic Esthetic-FSE、美观镍钛丝-ANT）；环氧树脂涂层的Niti弓丝（Spectra-S、Niticosmetic-TEC）；金和铑涂层的Niti（Sentalloy-STC）以及一个对照组（超弹性Niti（Nitinol-NS）。使用粗糙度仪评估初始粗糙度。之后，将这些弓丝在万能试验机上进行弯曲试验。每根弓丝以1mm/min的速度挠曲至2mm。弯曲试验后，在与初始评估相同的表面上评估弓丝的粗糙度。粗糙度和弯曲强度数据通过单因素方差分析和Tukey检验（α=0.05）进行分析。采用学生t检验比较挠曲前后的粗糙度（α=0.05）。S组和ANT组（分别为环氧树脂和PTFE涂层的弓丝）挠曲前后的粗糙度显著高于其他组（p<0.05）。弓丝挠曲显著增加了S组和STC组弓丝的粗糙度（p<0.05）。FSE组和NS组（PTFE涂层和未涂层）的弯曲强度高于其他组（p<0.05）。我们得出结论，正畸丝的粗糙度和弯曲强度不取决于美观涂层的类型，而是受该涂层应用方法的影响。挠曲会增加美观正畸丝的粗糙度。
