Department of Orthodontics, Faculty of Dentistry, Mansoura University, Mansoura, Egypt.
Angle Orthod. 2012 Jan;82(1):8-13. doi: 10.2319/030811-168.1. Epub 2011 Jun 30.
To determine the effects of a fluoride prophylactic agent on the mechanical properties and surface quality of a preformed round translucent composite archwire while comparing it with nickel-titanium (Ni-Ti) and multistranded stainless steel wires.
The wires were immersed in an acidulated phosphate fluoride solution (APF) or in distilled water (control) for 1.5 hours at 37°C. Flexural modulus of elasticity (E) and yield strength (YS) of the wires were measured using a three-point bending test in a universal testing machine. The springback ratio (YS/E) was calculated for each wire. The influence of fluoride treatment on properties of the wires was statistically analyzed using Student's t-test at α = .05. Surface changes were observed with a scanning electron microscope.
Fluoride treatment produced a statistically significant reduction in E, YS, and YS/E of the composite wire (P < .05). In addition, a significant decrease in E of Ni-Ti wire was found after exposure to fluoride, upon comparison with distilled water control treatment. On the other hand, no significant effect of fluoride treatment was found on YS and YS/E of Ni-Ti wire and on studied properties of the multistranded stainless steel wire (P > .05). Corrosive changes in surface topography were observed after exposure to the fluoride agent and were more pronounced with the composite wire.
These results suggest that using a topical fluoride agent with translucent composite wire could decrease the mechanical properties and might damage the surface of the wire, potentially contributing to prolonged orthodontic treatment.
在将预成型的圆透明复合弓丝与镍钛（Ni-Ti）和多股不锈钢丝进行比较的同时，确定氟化物预防剂对其机械性能和表面质量的影响。
将这些弓丝在 37°C 下分别浸泡在酸性焦磷酸盐氟化物溶液（APF）或蒸馏水中（对照）1.5 小时。使用万能试验机的三点弯曲试验测量弓丝的弯曲弹性模量（E）和屈服强度（YS）。为每条弓丝计算屈服强度与弹性模量的比值（YS/E）。使用 Student's t 检验在 α=0.05 的水平下对氟化物处理对弓丝性能的影响进行统计分析。使用扫描电子显微镜观察表面变化。
氟化物处理使复合弓丝的 E、YS 和 YS/E 均显著降低（P<0.05）。此外，与蒸馏水对照处理相比，Ni-Ti 弓丝在暴露于氟化物后 E 显著降低。另一方面，氟化物处理对 Ni-Ti 弓丝的 YS 和 YS/E 以及多股不锈钢丝的研究性能均无显著影响（P>0.05）。暴露于氟化物剂后，表面形貌发生腐蚀性变化，复合弓丝的变化更为明显。
这些结果表明，使用局部氟化物剂与透明复合弓丝一起使用可能会降低机械性能，并可能损坏弓丝的表面，从而可能延长正畸治疗时间。
