Rezvani Mohammad Bagher, Atai Mohammad, Hamze Faeze
Polymer and Petrochemical Institute, Tehran, Iran.
Indian J Dent Res. 2013 Mar-Apr;24(2):237-41. doi: 10.4103/0970-9290.116696.
Flexural strength (FS) is one of the most important properties of restorative dental materials which could be improved in fiber-reinforced composites (FRCs) by several methods including the incorporation of stronger reinforcing fibers.
This study evaluates the influence of the glass fiber diameter on the FS and elastic modulus of FRCs at the same weight percentage.
A mixture of 2,2-bis-[4-(methacryloxypropoxy)-phenyl]-propaneand triethyleneglycol dimethacrylate (60/40 by weight) was prepared as the matrix phase in which 0.5 wt. % camphorquinone and 0.5 wt. % N-N'-dimethylaminoethyl methacrylate were dissolved as photoinitiator system. Glass fibers with three different diameters (14, 19, and 26 μm) were impregnated with the matrix resin using a soft brush. The FRCs were inserted into a 2 × 2 × 25 mm3 mold and cured using a light curing unit with an intensity of ca. 600 mW/cm2 . The FS of the FRCs was measured in a three-point bending method. The elastic modulus was determined from the slope of the initial linear part of stress-strain curve. The fracture surface of the composites was observed using scanning electron microscopy to study the fiber-matrix interface.
The results were analyzed and compared using one-way ANOVA and Tukey's post-hoc test.
Although the FS increased as the diameter of fibers increased up to 19 μm (P < 0.05), no significant difference was observed between the composites containing fibers with diameters of 19 and 26 μm.
The diameter of the fibers influences the mechanical properties of the FRCs.
弯曲强度（FS）是口腔修复材料最重要的性能之一，通过包括加入更强增强纤维在内的多种方法，可在纤维增强复合材料（FRC）中得到改善。
本研究评估在相同重量百分比下玻璃纤维直径对FRC弯曲强度和弹性模量的影响。
制备2,2-双-[4-(甲基丙烯酰氧基丙氧基)-苯基]-丙烷与三乙二醇二甲基丙烯酸酯（重量比60/40）的混合物作为基质相，其中溶解0.5 wt.%樟脑醌和0.5 wt.%N-N'-二甲基氨基乙基甲基丙烯酸酯作为光引发体系。用软刷将三种不同直径（14、19和26μm）的玻璃纤维浸渍基质树脂。将FRC插入2×2×25mm³的模具中，使用强度约为600mW/cm²的光固化单元进行固化。采用三点弯曲法测量FRC的弯曲强度。从应力-应变曲线初始线性部分的斜率确定弹性模量。使用扫描电子显微镜观察复合材料的断裂表面，以研究纤维-基质界面。
采用单因素方差分析和Tukey事后检验对结果进行分析和比较。
尽管纤维直径增加至19μm时弯曲强度增加（P<0.05），但含19μm和26μm直径纤维的复合材料之间未观察到显著差异。
纤维直径影响FRC的力学性能。
