Szalóki Melinda, Csarnovics István, Bonyár Attila, Ungor Ditta, Csapó Edit, Sápi András, Hegedűs Csaba
Department of Biomaterials and Prosthetic Dentistry, Faculty of Dentistry, University of Debrecen, H-4032 Debrecen, Hungary.
Department of Experimental Physics, Institute of Physics, Faculty of Science and Technology, University of Debrecen, H-4026 Debrecen, Hungary.
Nanomaterials (Basel). 2023 Sep 13;13(18):2554. doi: 10.3390/nano13182554.
A low ratio of polymerization is a major problem in resin-based composites. In this paper, the plasmonic effect of gold-covered silica nanoparticles on the physicochemical and mechanical properties of bisphenol A diglycidyl dimethacrylate (Bis-GMA), triethylene glycol dimethacrylate (TEGDMA) and urethane dimethacrylate (UDMA) green light-photopolymerizable dental resin was investigated at an intensity of 1.4 mW/cm for 40 s. Transmission electron microscopy (TEM) showed silica of about 350 nm covered with 12-15 nm gold nanoparticles (Au NPs) at 100% nominal coverage. Five different concentrations of bare and patchy silica particles were used; in the latter composite, the calculated Au wt% were 0.0052 wt%, 0.0104 wt%, 0.0208 wt%, 0.04160 wt%, and 0.0823 wt%. The plasmon peak of patchy silica-filled nanocomposite overlapped with the absorption of Irgacure 784 photoinitiator and green LED light emission peak. The effect of plasmon-enhanced polymerization achieved with green light illumination was analyzed using diametral tensile strength (DTS), differential scanning calorimetry (DSC), surface plasmon resonance imaging (SPRi), and degree of conversion (DC) based on Raman spectroscopy. The values of the Au NP with 0.0208 wt% was found to be maximum in all the measured data. Based on our result, it can be concluded that the application of patchy silica particles in dental resin can improve the polymerization ratio and the mechanical parameters of the composite.
低聚合率是树脂基复合材料中的一个主要问题。本文研究了金包覆二氧化硅纳米颗粒在1.4 mW/cm强度下照射40 s时，对双酚A二缩水甘油二甲基丙烯酸酯（Bis-GMA）、三乙二醇二甲基丙烯酸酯（TEGDMA）和聚氨酯二甲基丙烯酸酯（UDMA）绿光可光聚合牙科树脂的物理化学和力学性能的等离子体效应。透射电子显微镜（TEM）显示，在100%标称覆盖率下，约350 nm的二氧化硅被12 - 15 nm的金纳米颗粒（Au NPs）包覆。使用了五种不同浓度的裸露和有斑点的二氧化硅颗粒；在后者的复合材料中，计算出的金重量百分比分别为0.0052 wt%、0.0104 wt%、0.0208 wt%、0.04160 wt%和0.0823 wt%。有斑点的二氧化硅填充纳米复合材料的等离子体峰与Irgacure 784光引发剂的吸收以及绿色发光二极管（LED）发光峰重叠。基于拉曼光谱，使用径向拉伸强度（DTS）、差示扫描量热法（DSC）、表面等离子体共振成像（SPRi）和转化率（DC）分析了绿光照射实现的等离子体增强聚合效应。发现在所有测量数据中，金纳米颗粒含量为0.0208 wt%时的值最大。根据我们的结果，可以得出结论，在牙科树脂中应用有斑点的二氧化硅颗粒可以提高复合材料的聚合率和力学参数。
