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首页> 美国卫生研究院文献>Materials >Effect of Hexagonal Boron nitride Nanopowder Reinforcement and Mixing Methods on Physical and Mechanical Properties of Self-Cured PMMA for Dental Applications
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Effect of Hexagonal Boron nitride Nanopowder Reinforcement and Mixing Methods on Physical and Mechanical Properties of Self-Cured PMMA for Dental Applications

机译：六方氮化硼纳米粉增强和混合方法对牙科用自固化PMMA物理力学性能的影响

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We report for the first time on the effect of biocompatible hexagonal boron nitride (h-BN) nanopowder reinforcement with different concentrations on the structural and mechanical properties of fabricated self-cured polymethyl methacrylate (PMMA) based dental materials (GC UNIFAST III). A comparison among the structural and mechanical properties between hand and ultrasonic mixing is also presented. Fabricated specimens were studied by scanning electron microscopy (SEM), X-ray diffraction (XRD), Fourier transform infrared spectrometry (FTIR), micro indentation, and flexural strength techniques. The ultrasonic mixing method provides better sample textures of the composite as compared to hand mixing. It is found that XRD and IR intensity of the peaks increases with the increase of h-BN concentration due to nanocomposite formation. The additions of h-BN nanoparticles to the acrylic resin enhanced the hardness and the flexibility values of the composites. Independently of the mixing method used, adding h-BN nanopowder relatively increases the Vickers Hardness numbers (VH) and Flexural Strength (FS) of the unmodified materials. However, using ultrasonic mixing method combined with h-BN nanopowder increases VH numbers to 300% and FS values to 550% with respect to the unmodified sample made by hand mixing. The results obtained are very encouraging and will support future research in vivo, to confirm whether PMMA loaded with h-BN nanoparticles is an improvement compared to current dental restorative materials.
机译：我们首次报告了不同浓度的生物相容性六方氮化硼六方氮化硼（h-BN）纳米粉增强材料对基于自固化聚甲基丙烯酸甲酯（PMMA）的牙科材料（GC UNIFAST III）的结构和力学性能的影响。还介绍了手工和超声混合之间的结构和机械性能之间的比较。通过扫描电子显微镜（SEM），X射线衍射（XRD），傅里叶变换红外光谱（FTIR），微压痕和抗弯强度技术研究了制成的样品。与手动混合相比，超声混合方法可提供更好的复合材料样品质地。发现由于纳米复合物的形成，峰的XRD和IR强度随着h-BN浓度的增加而增加。向丙烯酸树脂中添加h-BN纳米颗粒可提高复合材料的硬度和柔韧性值。独立于所使用的混合方法，添加h-BN纳米粉相对可提高未改性材料的维氏硬度值（VH）和抗弯强度（FS）。但是，与手工混合制得的未改性样品相比，使用超声混合方法结合h-BN纳米粉可将VH值提高到300％，将FS值提高到550％。所获得的结果令人鼓舞，并将支持未来的体内研究，以证实与目前的牙齿修复材料相比，负载有h-BN纳米颗粒的PMMA是否有改善。

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