The influence of nanofillers on the properties of ethanol-solvated and non-solvated dental adhesives.
The influence of nanofillers on the properties of ethanol-solvated and non-solvated dental adhesives.
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DOI：
10.5395/rde.2019.44.e28
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发表时间：
2019-08-01
期刊：
影响因子：
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通讯作者：
Lima, Adriano Fonseca
中科院分区：
文献类型：
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作者：
da Cruz, Leonardo Bairrada Tavares;Oliveira, Marcelo Tavares;Lima, Adriano Fonseca
目的：本研究的目的是评估不同浓度的纳米填料对乙醇溶剂化和非溶剂化牙科粘合剂化学和物理性质的影响。 材料和方法：用不同的纳米填料浓度（0、1、2和4 wt%）和2种溶剂浓度（0%和10%乙醇）制备八种实验粘合剂。使用微拉伸测试评估了实验粘合剂的几个特性，例如吸水性和溶解度（n = 5，20秒光激活）、实时转化程度（DC；n = 3、20和40秒光激活）以及6个月内聚强度的稳定性（CS；n = 20，20秒光激活）。使用平均光发射率为 1,200 mW/cm2 的发光二极管（Bluephase 20i，Ivoclar Vivadent）。 结果：溶剂的存在降低了固化 20 秒后的 DC，但增加了最终的 DC、吸水性和粘合剂的溶解度。储存在水中会降低粘合剂的强度。添加 1 wt% 和 2 wt% 纳米填料提高了粘合剂的聚合速率。结论：纳米填料和乙醇的存在提高了最终 DC，尽管溶剂化粘合剂在 20 秒时的 DC 低于非溶剂化粘合剂。乙醇的存在降低了粘合剂的强度并增加了它们的吸水性和溶解度。然而，纳米填料并不影响所测试粘合剂的吸水性和强度。
OBJECTIVES: The aim of this study was to evaluate the influence of different concentrations of nanofillers on the chemical and physical properties of ethanol-solvated and non-solvated dental adhesives.MATERIALS AND METHODS: Eight experimental adhesives were prepared with different nanofiller concentrations (0, 1, 2, and 4 wt%) and 2 solvent concentrations (0% and 10% ethanol). Several properties of the experimental adhesives were evaluated, such as water sorption and solubility (n = 5, 20 seconds light activation), real-time degree of conversion (DC; n = 3, 20 and 40 seconds light activation), and stability of cohesive strength at 6 months (CS; n = 20, 20 seconds light activation) using the microtensile test. A light-emitting diode (Bluephase 20i, Ivoclar Vivadent) with an average light emittance of 1,200 mW/cm2 was used.RESULTS: The presence of solvent reduced the DC after 20 seconds of curing, but increased the final DC, water sorption, and solubility of the adhesives. Storage in water reduced the strength of the adhesives. The addition of 1 wt% and 2 wt% nanofillers increased the polymerization rate of the adhesives.CONCLUSIONS: The presence of nanofillers and ethanol improved the final DC, although the DC of the solvated adhesives at 20 seconds was lower than that of the non-solvated adhesives. The presence of ethanol reduced the strength of the adhesives and increased their water sorption and solubility. However, nanofillers did not affect the water sorption and strength of the tested adhesives.