a Assistant Professor of Dental Biomaterials, Faculty of Dentistry, Mansuora University, Mansoura, Egypt.
Angle Orthod. 2013 Nov;83(6):981-6. doi: 10.2319/022013-147.1. Epub 2013 Jun 7.
To estimate the in vivo effect of nano-hydroxyapatite (HA) modification of banding glass-ionomer cement on microleakage under orthodontic bands.
Eighty noncarious premolars scheduled for extraction in 20 orthodontic patients were randomly divided into four groups. Grouping was based on the ratio of nano-HA (0%, 5%, 10%, 15% by weight) added to the luting glass-ionomer cement (GIC) Ketac-Cem, which was used for cementation of prefabricated micro-etched orthodontic bands. Dye penetration method was used for microleakage evaluation at the cement-band and cement-enamel interfaces. Statistical evaluation was performed with a Kruskal-Wallis test and a Mann-Whitney U-test, and a Bonferroni-adjusted significance level was calculated.
Bands cemented with conventional GIC showed the highest microleakage scores in comparison to those cemented with nano-HA-modified GIC. No significant difference was found between teeth banded with 10% and 15% modified GIC.
Modification of the banding GIC with 15% nano-HA revealed a positive effect on reducing microleakage around orthodontic bands.
评估带环玻璃离子水门汀经纳米羟基磷灰石（HA）改性后在正畸带环下的体内微渗漏效果。
20 名正畸患者的 80 颗非龋前磨牙拟行拔牙，将其随机分为 4 组。分组依据为添加至 Ketac-Cem 光固化玻璃离子水门汀中的纳米 HA（重量比为 0%、5%、10%、15%）的比例。使用微蚀刻正畸带环的预制件评估微渗漏，采用染色渗透法在粘结剂-带环和粘结剂-牙釉质界面进行评价。采用 Kruskal-Wallis 检验和 Mann-Whitney U 检验进行统计评估，并计算 Bonferroni 调整后的显著性水平。
与传统 GIC 粘结的带环显示出最高的微渗漏评分，而与纳米 HA 改性 GIC 粘结的带环微渗漏评分较低。10%和 15%改性 GIC 粘结的带环之间无显著差异。
正畸带环玻璃离子水门汀用 15%纳米 HA 改性可减少正畸带环周围的微渗漏。
