Department of Orthodontics, School of Dentistry, University of Bologna, Italy.
Acta Odontol Scand. 2012 Jan;70(1):49-55. doi: 10.3109/00016357.2011.575083. Epub 2011 Apr 15.
The purpose of this study was to evaluate the effect of three popular soft drinks on the Young's modulus, hardness, surface topography and chemical composition of widely used nickel-titanium-based orthodontic wires.
Thirty-two specimens (20 mm in length) were cut from the straight portion of pre-formed 0.019 × 0.025 inch Nitinol Heat-Activated archwires and randomly divided into four groups of eight specimens each: Group A1 (Coca Cola(®) regular); Group A2 (Santal(®) orange juice); Group A3 (Gatorade(®)); Group B (distilled, deionized water; dH(2)O). Each specimen was immersed in 10 ml of one of the soft drinks or dH(2)O, control, for 60 min, at 37°C. At the end of the soaking time, the Young's modulus and hardness were determined using a nanoindenter. Scanning Electron Microscope-Energy Dispersive Spectroscopy (SEM-EDS) was used to characterize the effects on the topography and chemical composition of the wires.
No statistically significant differences were found between the groups either in the Young's modulus or in hardness after the selected soaking protocol. Besides some surface colour changes, the topography and the chemical composition of the wires were not affected by the immersion in any of the chosen soft drinks.
These in-vitro results suggest that the consumption of soft drinks cannot be acknowledged as one possible reason for the degradation of the physical and chemical properties of heat activated nickel titanium orthodontic wires in patients undergoing fixed orthodontic treatment.
本研究旨在评估三种流行软饮料对广泛使用的镍钛基正畸丝的杨氏模量、硬度、表面形貌和化学成分的影响。
从预成型的 0.019×0.025 英寸 Nitinol 热激活弓丝的直段切下 32 个（20 毫米长）样本，并将其随机分为四组，每组 8 个样本：A1 组（可口可乐®普通型）；A2 组（桑塔®橙汁）；A3 组（佳得乐®）；B 组（蒸馏水，去离子水；dH₂O）。每个样本分别浸入 10 毫升的一种软饮料或 dH₂O（对照）中，在 37°C 下浸泡 60 分钟。浸泡时间结束后，使用纳米压痕仪测定杨氏模量和硬度。扫描电子显微镜-能谱（SEM-EDS）用于表征对线材形貌和化学成分的影响。
在所选择的浸泡方案后，各组之间在杨氏模量或硬度方面均无统计学差异。除了一些表面颜色变化外，线材的形貌和化学成分均不受浸泡在任何所选软饮料中的影响。
这些体外结果表明，在接受固定正畸治疗的患者中，软饮料的摄入不能被认为是导致热激活镍钛正畸丝物理和化学性质降解的一个可能原因。
