BisGMA/TEGDMA dental nanocomposites containing glyoxylic acid-modified high-aspect ratio hydroxyapatite nanofibers with enhanced dispersion.
BisGMA/TEGDMA dental nanocomposites containing glyoxylic acid-modified high-aspect ratio hydroxyapatite nanofibers with enhanced dispersion.
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DOI：
10.1088/1748-6041/7/4/045014
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发表时间：
2012-08
期刊：
影响因子：
--
通讯作者：
Li H
中科院分区：
文献类型：
--
作者：
Chen L;Xu C;Wang Y;Shi J;Yu Q;Li H
本研究的目的是研究羟基磷灰石(HAP)纳米纤维的乙醛酸(GA)改性对其在双酚A甲基丙烯酸缩水甘油酯(BisGMA)/三乙二醇二甲基丙烯酸酯(TEGDMA)牙科复合材料中分散性的影响，并考察所制得的牙科树脂及其复合材料的力学性能、吸水率和水溶性能。扫描电子显微镜观察表明，微米级羟基磷灰石纳米纤维束经过表面改性处理后，可以有效地分解为平均长度为15μm的单根羟基磷灰石纳米纤维。傅立叶变换红外光谱(FT-IR)、X-射线光电子能谱(XPS)和热重分析(TGA)表征证实乙醛酸与HAP纳米纤维表面的胺基发生化学反应，从而在纤维表面接枝了乙醛酸。与相应的牙科树脂和填充未经处理的HAP纳米纤维的复合材料相比，HAP纳米纤维在牙科基质中的分散性增强，导致双向弯曲强度(BFS)增加。此外，将小质量分数的乙醛酸改性的HAP纳米纤维浸渍到双GMA/TEGDMA牙科树脂(5wt%、10wt%)或复合材料(2wt%、3wt%)中，与对照组(纯树脂或单独填充二氧化硅颗粒的牙科复合材料)相比，也可以显著提高BFS。较大的质量分数不能进一步提高力学性能，甚至不能降低BFS值。水行为测试结果表明，乙醛酸改性羟基磷灰石纳米纤维的加入导致较高的吸水率和水溶性值，这并不适合临床应用。综上所述，HAP纳米纤维及其牙科复合材料的制备具有良好的分散性和力学性能，但其吸水率和水溶性能有待进一步提高。
The purpose of this research was to investigate the influence of the glyoxylic acid (GA) modification of hydroxyapatite (HAP) nanofibers on their dispersion in bisphenol A glycidyl methacrylate (BisGMA)/triethylene glycol dimethacrylate (TEGDMA) dental composites and also investigate the mechanical properties, water absorption, and water solubility of the resulting dental resins and composites. Scanning/Transmission electron microscopy (STEM) images showed that microsized HAP nanofiber bundles could be effectively broken down to individual HAP nanofibers with an average length of ~15 μm after the surface modification process. Fourier transform infrared spectroscopy (FT-IR), X-ray photoelectron spectroscopy (XPS) and thermal gravimetric analysis (TGA) characterization confirmed glyoxylic acid was chemically grafted on the HAP nanofiber surface, hypothetically by reacting with the amine group on HAP nanofiber surface. The enhanced dispersion of HAP nanofibers in dental matrix led to increased biaxial flexural strength (BFS) compared with the corresponding dental resins and composites filled with untreated HAP nanofibers. In addition, impregnation of small mass fractions of the glyoxylic acid modified HAP nanofibers into the BisGMA/TEGDMA dental resins (5wt%, 10wt%) or composites (2wt%, 3wt%) could also substantially improve the BFS in comparison with the controls(pure resins or dental composites filled with silica particles alone). Larger mass fractions could not further increase the mechanical property or even degrade the BFS values. Water behavior testing results indicated that the addition of glyoxylic acid modified HAP nanofibers resulted in higher water absorption and water solubility values which is not preferred for clinical application. In summary, well dispersed HAP nanofibers and their dental composites with enhanced mechanical property have been successfully fabricated but the water absorption and water solubility of such dental composites need to be further improved.
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影响因子：
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作者：
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