Dolci Gabriel Schmidt, Spohr Ana Maria, Zimmer Eduardo Rigon, Marchioro Ernani Menezes
Department of Orthodontics, Brazilian Association of Dental Surgeons, Brazil.
Dental Press J Orthod. 2013 Mar-Apr;18(2):69-75. doi: 10.1590/s2176-94512013000200016.
The purpose of this study was to evaluate the dimensions and surface characteristics of orthodontic wires and bracket slots of different commercial brands.
Thirty metallic brackets (0.022 x 0.028-in and 0.022 x 0.030-in) were divided into three groups: DYN/3M group = Dyna-Lock, 3M/Unitek (stainless steel, or SS); STD/MO group = Slim Morelli (SS); and Ni-Free/MO group = Slim Morelli (Ni-Free). The stainless steel wires (0.019 x 0.025-in) were divided into two groups: MO group = Morelli; and 3M group = 3M/Unitek. The bracket and wire measurements were done by two methods: (a) Surface Electron Microscopy (SEM), and (b) Profile Projection. The surface analysis was done qualitatively, based on SEM images and/or by a rugosimeter. The quantitative results were analyzed by ANOVA with Tukey's test (p < 0.05) and Student's t test.
A significant difference in the dimensions of slots was observed, and the NiFree/MO group showed the greatest changes when compared to the other groups. The analysis of surface topography of the brackets indicated greater homogeneity of the metallic matrix for DYN/3M and STD/MO groups. As for the dimensions of the wires, groups showed statistically different mean heights.
It was concluded that wires and brackets slots can present altered dimensions, which might directly and unintentionally affect the planned tooth movement.
本研究旨在评估不同商业品牌正畸丝和托槽槽沟的尺寸及表面特征。
将30个金属托槽（0.022×0.028英寸和0.022×0.030英寸）分为三组：DYN/3M组 = Dyna-Lock，3M/Unitek（不锈钢，或SS）；STD/MO组 = Slim Morelli（SS）；无镍/MO组 = Slim Morelli（无镍）。将不锈钢正畸丝（0.019×0.025英寸）分为两组：MO组 = Morelli；3M组 = 3M/Unitek。托槽和正畸丝的测量采用两种方法：（a）表面电子显微镜（SEM），以及（b）轮廓投影法。表面分析基于SEM图像和/或通过粗糙度仪进行定性分析。定量结果采用方差分析及Tukey检验（p < 0.05）和学生t检验进行分析。
观察到槽沟尺寸存在显著差异，与其他组相比，无镍/MO组的变化最大。托槽表面形貌分析表明，DYN/3M组和STD/MO组的金属基体具有更高的均匀性。至于正畸丝的尺寸，各组的平均高度在统计学上存在差异。
得出的结论是，正畸丝和托槽槽沟可能存在尺寸改变，这可能直接且无意地影响计划中的牙齿移动。
