Fabrication and evaluation of Bis-GMA/TEGDMA dental resins/composites containing nano fibrillar silicate
Fabrication and evaluation of Bis-GMA/TEGDMA dental resins/composites containing nano fibrillar silicate
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DOI：
10.1016/j.dental.2007.05.002
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发表时间：
2008-02-01
期刊：
影响因子：
5
通讯作者：
Fong, Hao
中科院分区：
文献类型：
--
作者：
Tian, Ming;Gao, Yi;Fong, Hao
Objective.研究不同质量分数的纳米纤维状硅酸盐（FS）对Bis-GMA/TEGDMA牙科树脂（不含常规玻璃填料）和复合材料（含常规玻璃填料）的增强作用。研究了三种分散方法，以分离硅烷化FS作为纳米级单晶并将其均匀分布到牙科基质中。采用近红外光谱原位监测Bis-GMA/TEGDMA/FS树脂的光固化行为，研究其光聚合速率和乙烯基双键转化率。测试了纳米FS增强树脂/复合材料的力学性能（弯曲强度、弹性模量和断裂功），并对所得数据进行方差分析（ANOVA）。用SEM/TEM观察了纳米FS的形貌及其增强树脂/复合材料的典型断口形貌。将小质量分数（1%和2.5%）的纳米FS浸渍到Bis-GMA/TEGDMA（50/50质量比）牙科树脂/复合材料中显著改善了力学性能。然而，较大的浸渍质量分数（7.5%）并没有进一步提高力学性能（单因素方差分析，P > 0.05），甚至可能降低力学性能。纳米FS在牙科树脂/复合材料中的高度分离和均匀分布是一个挑战。将纳米FS浸渍到牙科树脂/复合材料中可能会产生两种相反的效果：由于高度分离和均匀分布的纳米FS单晶而产生的增强效果，或由于形成FS团聚体/颗粒而产生的弱化效果。将高度分散的纳米FS单晶均匀分布在牙科树脂/复合材料中可显著提高树脂/复合材料的力学性能。(c)2007年，任中华民国牙科学会会长。由爱思唯尔有限公司出版。保留所有权利。
Objective. To investigate the reinforcement of Bis-GMA/TEGDMA dental resins (without conventional glass filler) and composites (with conventional glass filler) with various mass fractions of nano fibrillar silicate (FS).Methods. Three dispersion methods were studied to separate the silanized FS as nano-scaled single crystals and uniformly distribute them into dental matrices. The photo-curing behaviors of the Bis-GMA/TEGDMA/FS resins were monitored in situ by RT-NIR to study the photopolymerization rate and the vinyl double bond conversion. Mechanical properties (flexural strength, elastic modulus and work-of-fracture) of the nano FS reinforced resins/composites were tested, and analysis of variance (ANOVA) was used for the statistical analysis of the acquired data. The morphology of nano FS and the representative fracture surfaces of its reinforced resins/composites were examined by SEM/TEM.Results. Impregnation of small mass fractions (1% and 2.5%) of nano FS into Bis-GMA/TEGDMA (50/50 mass ratio) dental resins/composites improved the mechanical properties substantially. Larger mass fraction of impregnation (7.5%), however, did not further improve the mechanical properties (one way ANOVA, P > 0.05) and may even reduce the mechanical properties. The high degree of separation and uniform distribution of nano FS into dental resins/composites was a challenge. Impregnation of nano FS into dental resins/composites could result in two opposite effects: a reinforcing effect due to the highly separated and uniformly distributed nano FS single crystals, or a weakening effect due to the formation of FS agglomerates/particles.Significance. Uniform distribution of highly separated nano FS single crystals into dental resins/composites could significantly improve the mechanical properties of the resins/composites. (c) 2007 Academy of Dental Materials. Published by Elsevier Ltd. All rights reserved.