Tayebi Ali, Fallahzadeh Farnoosh, Morsaghian Marzieh
Assistant Professor of Orthodontics, Dental Caries Prevention Research Center, Qazvin University of Medical Sciences, Qazvin, Iran.
Assistant Professor of Operative Dentistry, Dental Caries Prevention Research Center, Qazvin University of Medical Sciences, Qazvin, Iran.
J Clin Exp Dent. 2017 Jun 1;9(6):e749-e755. doi: 10.4317/jced.53731. eCollection 2017 Jun.
This study aimed to assess the effect of surface preparation with sandblasting and diamond bur along with the use of three primers on shear bond strength (SBS) of metal brackets to aged composite.
In this , experimental study, 60 Filtek Z250 composite discs were fabricated (10×2mm), immersed in distilled water for 24 hours and subjected to 5000 thermal cycles. They were randomly divided into two groups (n=30) of sandblasting with aluminum oxide particles for 10 seconds and surface roughening with bur. Each group was randomly divided into three subgroups (n=10) for use of Transbond XT, Assure Plus and Composite Primer. Metal brackets were bonded and the samples were stored in distilled water for 24 hours followed by 2000 thermal cycles. The SBS of brackets was measured and the adhesive remnant index (ARI) score was calculated. The data were analyzed by one-way ANOVA, t-test and Chi square test.
The difference in the mean SBS was not significant among the six subgroups.
All combinations of primers and surface preparation methods provided adequately high SBS between brackets and aged composite surfaces. Considering the ARI scores, surface roughening by bur is superior to sandblasting. Shear strength, composite resins, orthodontic brackets, aged composite, surface preparation.
本研究旨在评估喷砂和金刚石车针进行表面处理以及使用三种底漆对金属托槽与老化复合材料之间剪切粘结强度（SBS）的影响。
在本实验研究中，制作了60个Filtek Z250复合树脂圆盘（10×2mm），将其浸入蒸馏水中24小时，然后进行5000次热循环。将它们随机分为两组（n = 30），一组用氧化铝颗粒喷砂10秒，另一组用车针进行表面粗糙化处理。每组再随机分为三个亚组（n = 10），分别使用Transbond XT、Assure Plus和复合底漆。粘结金属托槽，将样本在蒸馏水中保存24小时，随后进行2000次热循环。测量托槽的SBS，并计算粘结剂残留指数（ARI）评分。数据采用单因素方差分析、t检验和卡方检验进行分析。
六个亚组之间的平均SBS差异无统计学意义。
底漆和表面处理方法的所有组合在托槽与老化复合材料表面之间均提供了足够高的SBS。考虑到ARI评分，用车针进行表面粗糙化处理优于喷砂。剪切强度、复合树脂、正畸托槽、老化复合材料、表面处理。
