Keulemans Filip, Palav Prem, Aboushelib Moustafa M N, van Dalen Andy, Kleverlaan Cornelis J, Feilzer Albert J
Department of Dental Materials Science, Academic Centre for Dentistry Amsterdam (ACTA), University of Amsterdam and VU University Amsterdam, Louwesweg 1, 1066 EA Amsterdam, The Netherlands.
Dent Mater. 2009 Nov;25(11):1433-41. doi: 10.1016/j.dental.2009.06.013. Epub 2009 Aug 4.
The aim of this study was to evaluate in vitro the influence of fiber-reinforcement on the fracture strength and fatigue resistance of resin-based composites.
One hundred rectangular bar-shaped specimens (2 mm x 2 mm x 25 mm) made of resin-based composite were prepared in a stainless steel split-mould: (i) thirty specimens of particulate filler composite (PFC) (Filtek Z100, 3M ESPE, St Paul, MN, USA), (ii) thirty specimens of fiber-reinforced composite (FRC) (Everstick C&B, Sticktech Ltd., Turku, Finland) and (iii) forty specimens of PFC and FRC combined in two longitudinal layers of equal thickness. Each specimen was trimmed into a cylindrical hourglass shape. The fracture strength (cantilever beam test, n=10) and the fatigue resistance (rotating cantilever beam test; staircase method: 10(4) cycles, 1.2 Hz, n=20) were determined. Fracture strength, fatigue resistance and work-of-fracture were calculated. The fracture surfaces of failed specimens were analyzed with SEM. Data was analyzed by logistic regression, one-way ANOVA followed by Tukey's post hoc test and, a Student's t-test.
ANOVA revealed that fiber-reinforcement had significant effect (P<0.001) on fracture strength, fatigue resistance, and work-of-fracture. Student's t-test showed significant differences (P<0.001) in fatigue resistance compared to fracture strength.
Within the limitations of this study, the following conclusions can be drawn (i) the fatigue resistance of resin-based composites is lower than their fracture strength and (ii) FRC are more fatigue resistant than PFC or combinations of FRC and PFC.
本研究旨在体外评估纤维增强对树脂基复合材料断裂强度和抗疲劳性的影响。
在不锈钢分体模具中制备100个由树脂基复合材料制成的矩形棒状试件（2毫米×2毫米×25毫米）：（i）30个颗粒填料复合材料（PFC）试件（Filtek Z100，3M ESPE，美国明尼苏达州圣保罗），（ii）30个纤维增强复合材料（FRC）试件（Everstick C&B，Sticktech Ltd.，芬兰图尔库），以及（iii）40个PFC和FRC组合而成的试件，由两个等厚的纵向层组成。每个试件均修整成圆柱形沙漏形状。测定断裂强度（悬臂梁试验，n = 10）和抗疲劳性（旋转悬臂梁试验；阶梯法：10⁴ 次循环，1.2赫兹，n = 20）。计算断裂强度、抗疲劳性和断裂功。对失效试件的断裂表面进行扫描电子显微镜分析。数据通过逻辑回归、单因素方差分析及随后的Tukey事后检验和学生t检验进行分析。
方差分析显示纤维增强对断裂强度、抗疲劳性和断裂功有显著影响（P < 0.001）。学生t检验表明，与断裂强度相比，抗疲劳性存在显著差异（P < 0.001）。
在本研究的局限性范围内，可以得出以下结论：（i）树脂基复合材料的抗疲劳性低于其断裂强度；（ii）FRC比PFC或FRC与PFC的组合具有更高的抗疲劳性。
