Pereira Jefferson Ricardo, de Oliveira Jonas Alves, do Valle Accacio Lins, Zogheib Lucas Villaca, Ferreira Paulo Martins, Bastos Luiz Gustavo Cavalcanti
School of Dentistry, University of Southern Santa Catarina, Tubarao, SC, Brazil.
Gen Dent. 2011 Jul-Aug;59(4):e144-8.
The aim of this study was to evaluate the effect of prefabricated fiber posts on the flexural strength and modulus of elasticity of a composite resin. Thirty bar-shaped specimens measuring 25 x 2.0 x 2.0 mm were made, containing posts that were 1.3 mm in diameter and 20 mm long. Each group contained 10 specimens: Group 1, resin without post; Group 2, resin with carbon fiber post; Group 3, resin with glass fiber post. The samples were immersed in water at 37 degrees C until the three-point loading test was performed at a speed of 1.0 mm/minute. The results were statistically analyzed by ANOVA and Tukey's test (P = 0.05). Both fiber posts were similar in strength and both were stronger than the control. Group 3 obtained a higher mean modulus of elasticity than Groups 1 and 2, which were similar. The results of this study demonstrated that the presence of a fiber post significantly raised flexural strength values and the glass fiber post significantly increased the modulus of elasticity of the evaluated composite resin.
本研究的目的是评估预制纤维桩对复合树脂弯曲强度和弹性模量的影响。制作了30个尺寸为25×2.0×2.0毫米的棒状试件，其中包含直径为1.3毫米、长度为20毫米的桩。每组包含10个试件：第1组，不含桩的树脂；第2组，含碳纤维桩的树脂；第3组，含玻璃纤维桩的树脂。将样品浸泡在37摄氏度的水中，直到以1.0毫米/分钟的速度进行三点加载试验。结果通过方差分析和Tukey检验进行统计学分析（P = 0.05）。两种纤维桩的强度相似，且均比对照组更强。第3组获得的平均弹性模量高于第1组和第2组，后两组相似。本研究结果表明，纤维桩的存在显著提高了弯曲强度值，玻璃纤维桩显著增加了所评估复合树脂的弹性模量。
