Mirzakhani Mahboubeh, Mousavinasab Sayed Mostafa, Atai Mohammad
Department of Operative Dentistry, Dental School (Faculty), Islamic Azad University, Isfahan (Khorasgan) Branch, Iran.
Department of Operative Dentistry, Islamic Azad University, Isfahan (Khorasgan) Branch, Isfahan, Iran; Dental Materials Research Centre, Dental School, Isfahan University of Medical Sciences, Isfahan, Iran.
Dent Res J (Isfahan). 2016 Nov-Dec;13(6):515-520. doi: 10.4103/1735-3327.197032.
This study aimed to evaluate the effect of different percentages of ethanol solvent of an experimental methacrylate-based dentin bonding agent containing polyhedral oligomeric silsesquioxanes (POSS) on the microleakage of resin composite restorations.
In this experimental study, 42 extracted human premolar teeth used and 84 standard Class V cavities were prepared on the buccal and lingual surfaces of the teeth. The teeth were divided into 6 groups of 7. Experimental bonding agents with different percentages of solvent were used in 5 groups and Single Bond as a control. The teeth were restored with resin composite and subjected to thermal cycling test. Teeth were then immersed in a solution of 2% basic fuchsine dye for 24 h and sectioned buccolingually and scored using stereomicroscope with ×32 magnification. Microleakage data were analyzed using the Kruskal-Wallis, Mann-Whitney U, and Wilcoxon tests.
There were significant differences between the microleakage enamel margins ( = 0.036) and dentinal margins ( = 0.008) in all the groups. These significant differences were seen between the control group and groups containing 46 wt% solvent ( = 0.011), 46 wt% and 31 wt% solvent in dentinal ( = 0.027), 31 wt% and 0 wt% in enamel ( = 0.021), also 0 wt% and control in enamel ( = 0.039), and dentinal margins microleakage ( = 0.004). The microleakage in dentinal margins was higher than enamel margins ( < 0.001). In the groups with 46 wt% solvent ( = 0.103), 0 wt% ( = 0.122), and control group ( = 0.096), however, this difference was not significant.
The adhesive containing 31 wt% solvent showed the least marginal microleakage, presence of POSS filler may also result in the reduction of microleakage.
本研究旨在评估含多面体低聚倍半硅氧烷（POSS）的实验性甲基丙烯酸酯类牙本质粘结剂不同乙醇溶剂百分比对树脂复合材料修复体微渗漏的影响。
在本实验研究中，使用了42颗拔除的人类前磨牙，并在牙齿的颊面和舌面制备了84个标准Ⅴ类洞。将牙齿分为6组，每组7颗。5组使用不同溶剂百分比的实验性粘结剂，一组使用Single Bond作为对照。用树脂复合材料修复牙齿并进行热循环试验。然后将牙齿浸泡在2%碱性品红染料溶液中24小时，沿颊舌方向切片，并用放大32倍的体视显微镜评分。使用Kruskal-Wallis、Mann-Whitney U和Wilcoxon检验分析微渗漏数据。
所有组的釉质边缘微渗漏（P = 0.036）和牙本质边缘微渗漏（P = 0.008）之间存在显著差异。对照组与含46 wt%溶剂的组之间（P = 0.011）、牙本质中含46 wt%和31 wt%溶剂的组之间（P = 0.027）、釉质中含31 wt%和0 wt%溶剂的组之间（P = 0.021）、釉质中含0 wt%溶剂的组与对照组之间（P = 0.039）以及牙本质边缘微渗漏之间（P = 0.004）均存在这些显著差异。牙本质边缘的微渗漏高于釉质边缘（P < 0.001）。然而，在含46 wt%溶剂的组（P = 0.103）、含0 wt%溶剂的组（P = 0.122）和对照组（P = 0.096）中，这种差异不显著。
含31 wt%溶剂的粘结剂边缘微渗漏最少，POSS填料的存在也可能导致微渗漏减少。
