Nhan Ruby Thuy-Huy, Xu Xaoming, Yu Qingzhao, Ballard Richard, Armbruster Paul
Aust Orthod J. 2015 May;31(1):14-9.
The present study examined the effect of topical fluoride treatment on the shear bond strength (SBS) of orthodontic brackets using single-dose fluoride varnishes and assessed according to different post-application times and the pattern of debond.
Of the 105 extracted human mandibular premolars used in the study, 70 were subjected to the SBS test and the remaining 35 to the Adhesive Remnant Index (ARI) test. The teeth were divided into a control group and six test groups: Kolorz ClearShield 5% NaFl varnish Day 1, 8, and 15; and Vanish 5% NaFl varnish Day 1, 8, and 15. The samples were coated with their respective varnish, following which, brackets were bonded. Each specimen was subjected to a shear force in a universal testing machine until failure. Data were analysed using the analysis of variance (ANOVA).
At all time intervals, the mean SBS of the Vanish groups was not significantly different from the control group, and the shear strength in the ClearShield groups was significantly higher than the control and Vanish groups, except at Day 8 (no difference). For the same bonding material, there was no significant difference in mean SBS over different time intervals. ARI scores showed no significant difference between the groups.
The application of single-dose fluoride varnish, irrespective of the length of time between the fluoride treatment and bonding procedure, does not negatively affect the shear bond strength of orthodontic brackets.
本研究使用单剂量氟化物清漆检查局部用氟治疗对正畸托槽剪切粘结强度（SBS）的影响，并根据不同的涂覆后时间和脱粘模式进行评估。
在本研究中使用的105颗拔除的人类下颌前磨牙中，70颗进行SBS测试，其余35颗进行粘结剂残留指数（ARI）测试。牙齿被分为一个对照组和六个测试组：第1天、第8天和第15天使用Kolorz ClearShield 5% NaF清漆；以及第1天、第8天和第15天使用Vanish 5% NaF清漆。给样本涂上各自的清漆，然后粘结托槽。每个样本在万能试验机中承受剪切力直至破坏。使用方差分析（ANOVA）对数据进行分析。
在所有时间间隔，Vanish组的平均SBS与对照组无显著差异，除第8天（无差异）外，ClearShield组的剪切强度显著高于对照组和Vanish组。对于相同的粘结材料，不同时间间隔的平均SBS无显著差异。ARI评分在各组之间无显著差异。
单剂量氟化物清漆的应用，无论氟治疗与粘结程序之间的时间长短，均不会对正畸托槽的剪切粘结强度产生负面影响。
