Teymoornezhad Koorosh, Alaghehmand Homayoun, Daryakenari Ghazaleh, Khafri Soraya, Tabari Mitra
Postgraduate Student, Department of Pediatric Dentistry, Faculty of Dentistry, Babol University of Medical Sciences, Babol, Iran.
Associate Professor, Dental Materials Research Center, Department of Operative Dentistry, Faculty of Dentistry, Babol University of Medical Sciences, Babol, Iran.
Electron Physician. 2016 Nov 25;8(11):3289-3295. doi: 10.19082/3289. eCollection 2016 Nov.
Preventive resin restorations (PRR) are the conservative choice for the most common carious lesions in children. Thus, new age flowable resin composites with higher filler content are readily used. The aim of this study was to evaluate the microshear bond strength and microleakage of two flowable resin composites containing different percentages of nano zinc oxide (NZnO) particles, which have proven to have antimicrobial properties.
This experimental in-vitro study was carried out in the Dental Material Research Center of Babol University of Medical Sciences in 2015. One nanohybrid and one nanofill flowable resin composite were chosen and modified with the incorporation of 1% and 3% Wt NZnO particles. Six groups (n=10, 0%, 1%, and 3%) of resin composite sticks on dental enamel (2×2mm) were prepared to be placed in the microtensile tester. The microshear bond strength magnitude (MPa) was recorded at the point of failure. A class I box (3×0.8×1 mm) was prepared on 60 premolars and filled using the resin composites (6 groups, n=10). The specimens were immersed in a 5% basic fuschin solution and sectioned bucco-lingually to view the microleakage using a stereomicroscope. One-way ANOVA and Tukey tests for microshear and Wilcoxon and Kruskal-Wallis tests for microleakage were used to analyze the data in the IBM SPSS Statistics version 22 software.
The bond strength of the 3% clearfill group significantly decreased while no significant change occurred in the bond strength in other groups. The Z-350 group had significantly lower microleakage as nanoparticles increased. No significant difference was observed in the clearfill group.
Up to 3% Wt incorporation of NZnO particles will not diversely alter the bond strength, but it will be beneficial in providing antimicrobial effects with lower microleakage rates.
预防性树脂修复（PRR）是治疗儿童最常见龋损的保守选择。因此，具有较高填料含量的新型可流动树脂复合材料得到了广泛应用。本研究的目的是评估两种含有不同百分比纳米氧化锌（NZnO）颗粒的可流动树脂复合材料的微剪切粘结强度和微渗漏情况，已证实这些颗粒具有抗菌性能。
本实验性体外研究于2015年在巴博尔医科大学牙科材料研究中心进行。选择一种纳米混合和一种纳米填充可流动树脂复合材料，并分别加入1%和3%重量的NZnO颗粒进行改性。制备六组（n = 10，0%、1%和3%）树脂复合材料棒（2×2mm），用于粘结在牙釉质上，然后置于微拉伸测试仪中。在破坏点记录微剪切粘结强度值（MPa）。在60颗前磨牙上制备I类洞（3×0.8×1mm），并用树脂复合材料填充（6组，n = 10）。将标本浸入5%碱性品红溶液中，沿颊舌向切片，使用体视显微镜观察微渗漏情况。使用IBM SPSS Statistics 22软件中的单因素方差分析和Tukey检验分析微剪切数据，使用Wilcoxon和Kruskal-Wallis检验分析微渗漏数据。
3%的Clearfil组粘结强度显著降低，而其他组粘结强度无显著变化。随着纳米颗粒增加，Z-350组微渗漏显著降低。Clearfil组未观察到显著差异。
加入高达3%重量的NZnO颗粒不会显著改变粘结强度，但有利于提供抗菌效果并降低微渗漏率。
