Department of Endodontics and Restorative Dentistry, School of Dental Medicine, University of Zagreb, Gunduliceva 5, Zagreb, Croatia.
Community Health Center, Zagreb, Croatia.
J Dent. 2018 Aug;75:113-120. doi: 10.1016/j.jdent.2018.06.004. Epub 2018 Jun 18.
The aim of this work was to investigate the curing potential of an experimental resin composite series with the systematically varying amount of bioactive glass 45S5 by evaluating the degree of conversion, light transmittance and depth of cure.
Resin composites based on a Bis-GMA/TEGDMA resin with a total filler load of 70 wt% and a variable amount of bioactive glass (0-40 wt%) were prepared. The photoinitiator system was camphorquinone and ethyl-4-(dimethylamino) benzoate. The degree of conversion and light transmittance were measured by Raman spectroscopy and UV-vis spectroscopy, respectively. The depth of cure was evaluated according to the classical ISO 4049 test.
The initial introduction of bioactive glass into the experimental series diminished the light transmittance while the further increase in the bioactive glass amount up to 40 wt% caused minor variations with no clear trend. The curing potential of the experimental composites was similar to or better than that of commercial resin composites. However, unsilanized bioactive glass fillers demonstrated the tendency to diminish both the maximum attainable conversion and the curing efficiency at depth.
Experimental composite materials containing bioactive glass showed a clinically acceptable degree of conversion and depth of cure. The degree of conversion and depth of cure were diminished by bioactive glass fillers in a dose-dependent manner, although light transmittance was similar among all of the experimental composites containing 5-40 wt% of bioactive glass.
Reduced curing potential caused by the bioactive glass has possible consequences on mechanical properties and biocompatibility.
本研究通过评估转化率、透光率和固化深度，旨在研究系统变化的生物活性玻璃 45S5 含量的实验性树脂复合材料系列的固化潜力。
用Bis-GMA/TEGDMA 树脂和 70wt%的总填料制备基于双酚 A 双甲基丙烯酸酯/三乙二醇二甲基丙烯酸酯树脂的复合材料，并添加不同含量（0-40wt%）的生物活性玻璃。光引发剂系统为樟脑醌和 4-（二甲氨基）苯甲酸乙酯。通过拉曼光谱和紫外可见光谱分别测量转化率和透光率，根据经典 ISO 4049 测试评估固化深度。
实验系列中生物活性玻璃的最初引入降低了透光率，而进一步增加生物活性玻璃含量至 40wt%，透光率的变化较小，没有明显的趋势。实验复合材料的固化潜力与商业树脂复合材料相似或更好。然而，未经硅烷化处理的生物活性玻璃填料表现出降低最大转化率和固化深度效率的趋势。
含有生物活性玻璃的实验性复合材料显示出临床可接受的转化率和固化深度。生物活性玻璃填料以剂量依赖的方式降低转化率和固化深度，尽管所有含有 5-40wt%生物活性玻璃的实验复合材料的透光率相似。
生物活性玻璃降低的固化潜力可能对机械性能和生物相容性产生影响。
