OBJECTIVE To test the effects of addition of polyacrilonitrile (PAN) nanofibers and nanocrystal cellulose (NCC)-containing PAN nanofibers on flexural properties of experimental dental composites. METHODS 11wt% PAN in dimethylformamide (DMF) solution was electrospun at 17.2kVA and 20cm from the collector drum. NCC was added to the solution at 3wt%. Fiber mats were produced in triplicates and tested as-spun. Strips (5cm×0.5cm) were cut from the mat in an orientation parallel and perpendicular to the rotational direction of the collector drum. Tensile tests were performed and ultimate tensile strength (UTS), elastic modulus (E) and elongation at maximum stress (%) were calculated from stress/strain plots. Fiber mats were then infiltrated by resin monomers (50/50 BisGMA/TEGDMA wt%), stacked in a mold (2×15×25) and light-cured. Beams (2×2×25mm) were cut from the slabs and tested in a universal testing machine. Data were analyzed by multiple t-test and one-way ANOVA (α=0.05). RESULTS Addition of 3% NCC resulted in higher tensile properties of the fibers. Fibers presented anisotropic behavior with higher UTS and E when tested in perpendicular orientation. The incorporation of 3% NCC-PAN nanofibers resulted in significant increase in work of fracture and flexural strength of experimental dental composite beams. SIGNIFICANCE NCC was found to be a suitable nanoparticle to reinforce experimental dental composites by incorporation via nanofiber. This fundamental study warrants future investigation in the use of electrospun nanofibres as a way to reinforce dental composites.

中文翻译：

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包含纳米晶体纤维素的聚丙烯腈-电纺纳米纤维的实验复合材料。

目的测试聚丙烯腈（PAN）纳米纤维和含纳米晶体纤维素（NCC）的PAN纳米纤维的添加对实验性牙科复合材料弯曲性能的影响。方法在17.2kVA和距收集鼓20cm处，电纺丝在二甲基甲酰胺（DMF）溶液中的11wt％PAN。将NCC以3重量％添加到溶液中。纤维垫一式三份生产，并按原样进行测试。从垫上以平行于并垂直于收集鼓的旋转方向的方向切下条带（5cm×0.5cm）。进行拉伸测试，并从应力/应变图计算极限拉伸强度（UTS），弹性模量（E）和最大应力下的伸长率（％）。然后，纤维毡被树脂单体（50/50 BisGMA / TEGDMA wt％）浸润，堆叠在模具（2×15×25）中并进行光固化。从平板上切下梁（2×2×25mm），并在通用测试机中进行测试。通过多重t检验和单向方差分析（a = 0.05）分析数据。结果添加3％的NCC可以使纤维具有更高的拉伸性能。在垂直方向测试时，纤维具有较高的UTS和E的各向异性。掺入3％的NCC-PAN纳米纤维可显着增加实验性牙科复合材料梁的断裂功和抗弯强度。意义NCC被发现是通过纳米纤维掺入来增强实验性牙科复合材料的合适纳米颗粒。这项基础研究值得进一步研究使用电纺纳米纤维作为增强牙科复合材料的方法。通过多重t检验和单向方差分析（a = 0.05）分析数据。结果添加3％的NCC可以使纤维具有更高的拉伸性能。在垂直方向测试时，纤维具有较高的UTS和E的各向异性。掺入3％的NCC-PAN纳米纤维可显着增加实验性牙科复合材料梁的断裂功和抗弯强度。意义NCC被发现是通过纳米纤维掺入来增强实验性牙科复合材料的合适纳米颗粒。这项基础研究值得进一步研究使用电纺纳米纤维作为增强牙科复合材料的方法。通过多重t检验和单向方差分析（a = 0.05）分析数据。结果添加3％的NCC可以使纤维具有更高的拉伸性能。在垂直方向测试时，纤维具有较高的UTS和E的各向异性。掺入3％的NCC-PAN纳米纤维可显着增加实验性牙科复合材料梁的断裂功和抗弯强度。意义NCC被发现是通过纳米纤维掺入来增强实验性牙科复合材料的合适纳米颗粒。这项基础研究值得进一步研究使用电纺纳米纤维作为增强牙科复合材料的方法。在垂直方向测试时，纤维具有较高的UTS和E的各向异性。掺入3％的NCC-PAN纳米纤维可显着增加实验性牙科复合材料梁的断裂功和抗弯强度。意义NCC被发现是通过纳米纤维掺入来增强实验性牙科复合材料的合适纳米颗粒。这项基础研究值得进一步研究使用电纺纳米纤维作为增强牙科复合材料的方法。在垂直方向测试时，纤维具有较高的UTS和E的各向异性。掺入3％的NCC-PAN纳米纤维可显着增加实验性牙科复合材料梁的断裂功和抗弯强度。意义NCC被发现是通过纳米纤维掺入来增强实验性牙科复合材料的合适纳米颗粒。这项基础研究值得进一步研究使用电纺纳米纤维作为增强牙科复合材料的方法。