BisGMA/TEGDMA dental composite containing high aspect-ratio hydroxyapatite nanofibers.
BisGMA/TEGDMA dental composite containing high aspect-ratio hydroxyapatite nanofibers.
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BisGMA/TEGDMA 牙科复合材料含有高纵横比羟基磷灰石纳米纤维。
DOI：
10.1016/j.dental.2011.08.403
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发表时间：
2011-11
期刊：
影响因子：
5
通讯作者：
Li, Hao
中科院分区：
文献类型：
--
作者：
Chen, Liang;Yu, Qingsong;Wang, Yong;Li, Hao
本研究的目的是研究高长径比羟基磷灰石（HAP）纳米纤维的性能以及这种纤维对双酚A甲基丙烯酸缩水甘油酯（BisGMA）/三甘醇二甲基丙烯酸酯（TEGDMA）牙科树脂（不含二氧化硅微粒填料）和牙科复合材料（含二氧化硅微粒填料）的增强效果。采用湿化学法合成了羟基磷灰石纳米纤维，并通过X射线衍射（XRD）、扫描电镜（SEM）和热重分析（TGA）对纤维进行了表征。测试不含任何微米填料的HAP纳米纤维增强牙科树脂和含二氧化硅微粒填料的牙科复合材料的双轴弯曲强度（BFS），并使用方差分析（ANOVA）对所获得的数据进行统计学分析。用扫描电子显微镜观察了受试牙科复合材料样品的断裂面形态。在水溶液中用湿化学法可以成功地制备出长径比为600 ~ 800的HAP纳米纤维。将小质量分数的HAP纳米纤维（5wt%或10wt%）浸渍到BisGMA/TEGDMA牙科树脂中或将小质量分数的HAP纳米纤维（2wt%或3wt%）浸渍到牙科复合材料中可以显著改善所得牙科树脂和复合材料的双轴弯曲强度。对于具有或不具有二氧化硅微粒填料的牙科复合材料，观察到HAP纳米纤维的逾渗阈值，超过该逾渗阈值，更多的纳米纤维将不再进一步增加含有HAP纳米纤维的牙科复合材料的机械性能。我们的力学测试和断口分析表明，在低质量分数的HAP纳米纤维的相对良好的分散是显着提高双轴弯曲强度的关键原因，而较高的质量分数的HAP纳米纤维往往会导致束，不能有效地增强牙科树脂或复合材料，甚至可能作为缺陷，从而降低所得的牙科树脂和复合材料的机械性能。加入质量分数小、分散性好的HAP纳米纤维可提高牙科树脂和牙科复合材料的力学性能。
The objectives of this study are to investigate the properties of high aspect-ratio hydroxyapatite (HAP) nanofibers and the reinforcing effect of such fibers on bisphenol A glycidyl methacrylate (BisGMA)/triethylene glycol dimethacrylate (TEGDMA) dental resins (without silica microparticle filler) and dental composites (with silica microparticle filler) with various mass fractions (loading rates). HAP nanofibers were synthesized using a wet-chemical method and characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), and thermal gravimetric analysis (TGA). Biaxial flexural strength (BFS) of the HAP nanofibers reinforced dental resins without any microsized filler and dental composites with silica microparticle filler was tested and analysis of variance (ANOVA) was used for the statistically analysis of acquired data. The morphology of fracture surface of tested dental composite samples was examined by SEM. The HAP nanofibers with aspect-ratios of 600 to 800 can be successfully fabricated with a simple wet-chemical method in aqueous solution. Impregnation of small mass fractions of the HAP nanofibers (5 wt% or 10 wt%) into the BisGMA/TEGDMA dental resins or impregnation of small mass fractions of the HAP nanofibers (2 wt% or 3 wt%) into the dental composites can substantially improve the biaxial flexural strength of the resulting dental resins and composites. A percolation threshold of HAP nanofibers, beyond which more nanofibers will no longer further increase the mechanical properties of dental composites containing HAP nanofibers, was observed for the dental composites with or without silica microparticle filler. Our mechanical testing and fractographic analysis indicated that the relatively good dispersion of HAP nanofibers at low mass fraction is the key reason for the significantly improved biaxial flexural strength, while higher mass fraction of HAP nanofibers tends to lead to bundles that cannot effectively reinforce the dental resins or composites and may even serve as defects and thus degrade the resulting dental resin and composite mechanical properties. The incorporation of small mass fraction of HAP nanofibers with good dispersion can improve the mechanical property of dental resins and dental composites.
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影响因子：
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作者：
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发表时间：
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影响因子：
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作者：
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通讯作者：
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