Cariology and Operative Dentistry, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University.
Institute of Dental Medicine, First Faculty of Medicine of the Charles University and General University Hospital in Prague.
Dent Mater J. 2021 May 29;40(3):599-605. doi: 10.4012/dmj.2020-154. Epub 2020 Dec 24.
The effect of 1-week water storage and subsequent 10,000 thermal cycles on light transmission properties (straight-line transmission (G0), diffusion (DF), the amount of transmitted light (AV)), translucency parameter (TP) and refractive index (RI) of four nanofilled flowable composites was examined. The composites included Filtek Supreme Ultra Flowable Restorative (FSU), Estelite Flow Quick (EFQ), Estelite Universal Flow, (EUF), and Clearfil Majesty ES Flow (ESF), all of A3 shade. For composites with lower filler load (FSU, EFQ), water storage increased G0, AV and TP, but subsequent thermocycling decreased them. An opposite tendency was found for DF. Materials with higher filler load (EUF, ESF) were not significantly affected by aging conditions. RI of EFQ and EUF containing bisphenol A polyethoxy methacrylate (Bis-MPEPP) increased significantly after thermocycling. Additionally, morphological changes were observed using scanning electron microscopy which revealed cracks within nanocluster fillers and dislocation of particles in FSU and EFQ after thermocycling.
研究了 1 周水储存及随后 10000 次热循环对 4 种纳米填充型流动性复合树脂的透光性能（直射透光率（G0）、扩散（DF）、透光量（AV））、半透明度参数（TP）和折射率（RI）的影响。这些复合材料包括 Filtek Supreme Ultra Flowable Restorative（FSU）、Estelite Flow Quick（EFQ）、Estelite Universal Flow（EUF）和 Clearfil Majesty ES Flow（ESF），均为 A3 色调。对于填料负载较低的复合材料（FSU、EFQ），水储存会增加 G0、AV 和 TP，但随后的热循环会降低它们。DF 则呈现相反的趋势。填料负载较高的材料（EUF、ESF）不受老化条件的显著影响。含双酚 A 聚乙氧基甲丙烯酸酯（Bis-MPEPP）的 EFQ 和 EUF 的 RI 在热循环后显著增加。此外，扫描电子显微镜观察到形态变化，显示在热循环后 FSU 和 EFQ 中的纳米簇填料内出现裂缝以及颗粒的位错。
