Chromatic analysis of orthodontic resin bonding agents exposed to different antiseptic mouthrinses

ABSTRACT Objective: To assess the color of different orthodontic resin bonding agents exposed to three antiseptic mouthrinses for a prolonged time interval (10-year aging simulation). Methods: 160 specimens were distributed into four groups, according to the orthodontic resin bond agent (Concise, Transbond XT, Transbond Plus Color Change, and Natural Ortho). Each group was exposed to different antiseptic mouthrinses: alcohol-based (Listerine®), alcohol-free (Oral-B®), chlorhexidine (Periogard®) and distilled water as the control. Specimens were submitted to two cycles of staining and artificial aging. Color was evaluated by means of a digital spectrophotometer at the beginning of the experiment and after every cycle. The system used to assess color changes was the CIE L*a*b*. Data was analyzed using the ANOVA and Tukey post-hoc test. Results: After simulation of 10 years of aging, Transbond XT and Natural Ortho composites presented no statistically significant differences in ∆E when exposed to different mouthrinses. The Concise composite specimens exposed to alcohol-free mouthrinse presented a significant difference when compared with specimens from the same group exposed to other antiseptic mouthrinses. Transbond Plus Color Change specimens exposed to chlorhexidine mouthrinse and to alcohol-containing mouthrinse presented a significant difference when compared with the specimens from the group exposed to water and alcohol-free antiseptic. Conclusion: All orthodontic resin bonding agents tested presented clinically perceptible color changes when exposed to at least one of the mouthrinses, except for the Natural Ortho composite. The Concise composite exposed to the alcohol-free solution was the resin that presented the highest color change values.摘要 研究目的：本研究旨在评估三种抗菌漱口水经长期作用（模拟10年老化）后，不同正畸树脂粘接剂的色泽变化情况。 方法：将160个试样按所使用的正畸树脂粘接剂分为4组，分别为Concise、Transbond XT、Transbond Plus Color Change及Natural Ortho。各组分别接受不同抗菌漱口水处理：含酒精型（李施德林®，Listerine®）、无酒精型（欧乐B®，Oral-B®）、洗必泰型（Periogard®），并以蒸馏水作为空白对照组。对所有试样进行两轮染色与人工老化循环处理。在实验初始阶段及每轮处理结束后，采用数字分光光度计对试样色泽进行检测，采用CIE L*a*b*色彩空间系统评估色泽变化。数据通过方差分析（ANOVA）及Tukey事后检验进行统计学分析。 结果：经过10年老化模拟后，Transbond XT与Natural Ortho复合材料在不同漱口水作用下的色差值（ΔE）无统计学显著差异。经无酒精漱口水处理的Concise复合材料试样，与同组接受其他抗菌漱口水处理的试样相比，色差值存在显著统计学差异。经洗必泰漱口水及含酒精漱口水处理的Transbond Plus Color Change试样，与以蒸馏水及无酒精抗菌漱口水处理的对照组试样相比，色差值存在显著差异。 结论：本次测试的所有正畸树脂粘接剂中，除Natural Ortho复合材料外，其余均在至少一种漱口水作用下出现了临床可感知的色泽变化。其中，经无酒精溶液处理的Concise复合材料，其色差值为所有受试树脂中最高。