Fabrication and evaluation of Bis-GMA/TEGDMA dental resins/composites containing halloysite nanotubes.
Fabrication and evaluation of Bis-GMA/TEGDMA dental resins/composites containing halloysite nanotubes.
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DOI：
10.1016/j.dental.2012.06.007
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发表时间：
2012-10
期刊：
影响因子：
5
通讯作者：
Fong, Hao
中科院分区：
文献类型：
--
作者：
Chen, Qi;Zhao, Yong;Wu, Weidong;Xu, Tao;Fong, Hao
研究不同质量分数的埃洛石纳米管(HNTs)对Bis-GMA/TEGDMA牙科树脂(不含常规玻璃填料)及相应复合材料(含常规玻璃填料)的增强效果。研究了三种分散方法，将硅烷化的埃洛石作为单独的HNTs进行分离，并将其均匀分布到牙科基质中。用水银膨胀仪测量了光聚合引起的体积收缩。采用实时近红外光谱技术研究了乙烯基双键转化率和光聚合速率。在万能机械试验机上测试了复合材料的力学性能。所得数据采用方差分析(ANOVA)进行统计分析。用扫描电子显微镜和透射电子显微镜观察了埃洛石/HNTs的形态和增强牙科树脂/复合材料的典型断口。在Bis-GMA/TEGDMA牙科树脂/复合材料中浸渍质量分数较小(如1%和2.5%)的硅烷化HNTs可显著提高力学性能；但浸渍质量分数较大(如5%)的HNTs不能进一步改善力学性能。HNTs在牙科树脂/复合材料中的浸渍会产生两种相反的作用：由于HNTs的高度分散和均匀分布而产生的增强作用和由于HNT团聚/颗粒的形成而产生的减弱作用。将少量分散良好的硅烷化HNTs均匀分布在Bis-GMA/TEGDMA牙科树脂/复合材料中，可显著提高其力学性能。
To investigate the reinforcement of Bis-GMA/TEGDMA dental resins (without conventional glass filler) and the corresponding composites (with conventional glass filler)containing vari ed mass fractions of halloysite nanotubes (HNTs). Three dispersion methods were studied to separate the silanized halloysite as individual HNTs and to uniformly distribute them into dental matrices. Photopolymerization induced volumetric shrinkage was measured by using a mercury dilatometer. Real time near infrared spectroscopy was adopted to study the degree of vinyl double bond conversion and the photopolymerization rate. Mechanical properties of the composites were tested by a universal mechanical testing machine. Analysis of Variance (ANOVA) was used for the statistical analysis of the acquired data. Morphologies of halloysite/HNTs and representative fracture surfaces of the reinforced dental resins/composites were examined by SEM and TEM. Impregnation of small mass fractions (e.g., 1% and 2.5%) of the silanized HNTs in Bis-GMA/TEGDMA dental resins/composites improved mechanical properties significantly; however; large mass fractions (e.g., 5%) of impregnation did not further improve the mechanical properties. The impregnation of HNTs into dental resins/composites could result in two opposite effects: the reinforcing effect due to the highly separated and uniformly distributed HNTs, and the weakening effect due to the formation of HNT agglomerates/particles. Uniform distribution of a small amount of well-separated silanized HNTs into Bis-GMA/TEGDMA dental resins/composites could result in substantial improvements on mechanical properties.
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DOI：
10.14219/jada.archive.1994.0053
发表时间：
1994-04-01
影响因子：
3.9
作者：
BERRY, TG;NICHOLSON, J;TROENDLE, K
通讯作者：
TROENDLE, K
DOI：
10.1002/jbm.820170309
发表时间：
1983-01-01
期刊：
JOURNAL OF BIOMEDICAL MATERIALS RESEARCH
影响因子：
--
作者：
ABELL, AK;LEINFELDER, KF;TURNER, DT
通讯作者：
TURNER, DT
DOI：
10.14219/jada.archive.1963.0010
发表时间：
1963-01-01
影响因子：
3.9
作者：
BOWEN, RL
通讯作者：
BOWEN, RL
影响因子：
17.1
作者：
Guimaraes, Luciana;Enyashin, Andrey N.;Seifert, Gotthard
通讯作者：
Seifert, Gotthard
影响因子：
3.7
作者：
Guimaraes, Luciana;Enyashin, Andrey N.;Duarte, Helio A.
通讯作者：
Duarte, Helio A.