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Hybrid engineered dental composites by multiscale reinforcements with chitosan-integrated halloysite nanotubes and S-glass fibers
Composites Part B: Engineering ( IF 13.1 ) Pub Date : 2020-10-01 , DOI: 10.1016/j.compositesb.2020.108448
Kiho Cho , Muhammad Yasir , Minkyo Jung , Mark D.P. Willcox , Martina H. Stenzel , Ginu Rajan , Paul Farrar , B. Gangadhara Prusty

Novel combinations of mechanical and biological properties are required when developing new polymer-based restorative dental composites. This study reports a promising strategy to develop preventive and restorative dental materials by synthesizing multifunctional dental composites reinforced with chitosan integrated halloysite nanotubes (CHI-HNTs). An enhanced dispersion capability of CHI-HNTs in the urethane-dimethacrylate/triethyleneglycol-dimethacrylate based dental composite is obtained by a sonication-supported chitosan integrating process, resulting in increased mechanical properties such as flexural strength, modulus, and breaking energy of the composites (2 wt% CHI-HNTs, 45 wt% glass particle, 5 wt% glass fiber) up to 8.1%, 17.2%, and 9.8% compared to control composites without CHI-HNT. Microscopic fractography of the fracture surface reveals that highly dispersed CHI-HNTs contribute to the increased mechanical strength of the composites. This is achieved via a dispersion-strengthening mechanism such as nanotube pinning and bridging/pull-out reinforcements. The highly dispersed CHI-HNTs in the composites also have antibacterial capability against Streptococcus mutans. With 2 wt% of CHI-HNTs in the composites, the viability of S. mutans biofilm decreases by approximately 39%. The positively charged amine groups (-NH3+) of chitosan are involved in improving the dispersion effect of HNTs and antibacterial activity of the CHI-HNTs reinforced dental composites. These findings open the route for developing advanced dental composites and engineered biomaterials with well-controlled HNTs dispersion.



中文翻译:

壳聚糖整合的埃洛石纳米管和S-玻璃纤维的多尺度增强材料的混合工程复合牙科材料

在开发新的基于聚合物的修复性牙科复合材料时,需要机械和生物学特性的新颖组合。这项研究报告了一种有前途的策略,可以通过合成由壳聚糖整合的埃洛石纳米管(CHI-HNTs)增强的多功能牙科复合材料来开发预防性和修复性牙科材料。通过超声辅助壳聚糖的整合工艺,CHI-HNTs在氨基甲酸酯-二甲基丙烯酸酯/三乙二醇-二甲基丙烯酸酯基牙科复合材料中的分散能力得到增强,从而提高了复合材料的机械性能,例如挠曲强度,模量和断裂能(与没有CHI-HNT的对照复合材料相比,CHI-HNTs为2 wt%,玻璃颗粒为45 wt%,玻璃纤维为5 wt%,最高可达8.1%,17.2%和9.8%。断裂表面的显微分形照片显示,高度分散的CHI-HNTs有助于提高复合材料的机械强度。这是通过分散强化机制(例如纳米管固定和桥接/拉出增强材料)来实现的。复合材料中高度分散的CHI-HNT也具有抗细菌能力变形链球菌。在复合物中使用2 wt%的CHI-HNT时,变形链球菌生物膜的生存能力降低了约39%。壳聚糖的带正电荷的胺基(-NH 3 +)参与改善HNTs的分散效果和CHI-HNTs增强牙科复合材料的抗菌活性。这些发现为开发具有良好控制的HNT分散性的先进牙科复合材料和工程生物材料开辟了道路。

更新日期:2020-10-06
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