Maruo Yukinori, Nishigawa Goro, Irie Masao, Yoshihara Kumiko, Minagi Shogo
Department of Occlusion and Removable Prosthodontics, Okayama University Hospital , Okayama , Japan.
Acta Odontol Scand. 2015;73(8):581-7. doi: 10.3109/00016357.2014.958875. Epub 2015 Apr 20.
High flexural properties are needed for fixed partial denture or implant prosthesis to resist susceptibility to failures caused by occlusal overload. The aim of this investigation was to clarify the effects of four different kinds of fibers on the flexural properties of fiber-reinforced composites.
Polyethylene fiber, glass fiber and two types of carbon fibers were used for reinforcement. Seven groups of specimens, 2 × 2 × 25 mm, were prepared (n = 10 per group). Four groups of resin composite specimens were reinforced with polyethylene, glass or one type of carbon fiber. The remaining three groups served as controls, with each group comprising one brand of resin composite without any fiber. After 24-h water storage in 37°C distilled water, the flexural properties of each specimen were examined with static three-point flexural test at a crosshead speed of 0.5 mm/min.
Compared to the control without any fiber, glass and carbon fibers significantly increased the flexural strength (p < 0.05). On the contrary, the polyethylene fiber decreased the flexural strength (p < 0.05). Among the fibers, carbon fiber exhibited higher flexural strength than glass fiber (p < 0.05). Similar trends were observed for flexural modulus and fracture energy. However, there was no significant difference in fracture energy between carbon and glass fibers (p > 0.05).
Fibers could, therefore, improve the flexural properties of resin composite and carbon fibers in longitudinal form yielded the better effects for reinforcement.
固定局部义齿或种植修复体需要高抗弯性能以抵抗由咬合过载引起的失效易感性。本研究的目的是阐明四种不同类型的纤维对纤维增强复合材料抗弯性能的影响。
使用聚乙烯纤维、玻璃纤维和两种类型的碳纤维进行增强。制备七组尺寸为2×2×25mm的试样（每组n = 10）。四组树脂复合材料试样分别用聚乙烯、玻璃或一种类型的碳纤维增强。其余三组作为对照组，每组包含一个品牌的未添加任何纤维的树脂复合材料。在37°C蒸馏水中储存24小时后，以0.5mm/min的十字头速度通过静态三点弯曲试验检测每个试样的抗弯性能。
与未添加任何纤维的对照组相比，玻璃纤维和碳纤维显著提高了抗弯强度（p < 0.05）。相反，聚乙烯纤维降低了抗弯强度（p < 0.05）。在这些纤维中，碳纤维表现出比玻璃纤维更高的抗弯强度（p < 0.05）。抗弯模量和断裂能也观察到类似趋势。然而，碳纤维和玻璃纤维之间的断裂能没有显著差异（p > 0.05）。
因此，纤维可以改善树脂复合材料的抗弯性能，纵向形式的碳纤维产生更好的增强效果。
