Civil and Environmental Engineering Department, University of Perugia, Strada di Pentima, 4, 05100 Terni, Italy.
J Dent. 2012 Nov;40(11):968-78. doi: 10.1016/j.jdent.2012.08.003. Epub 2012 Aug 21.
The aim of this study was to investigate the mechanical properties of five types of fibre-reinforced composite (FRC) posts and compare them with traditional metal post.
Five FRC posts and a metallic post having different geometry and type of fibre (glass, carbon or quartz fibre) were loaded to failure in compression and bending. The transverse sections of FRC posts were observed using SEM to evaluate the fracture mode and the percentage of fibres (compared with burn-off test). Densities and voids content were also evaluated.
Mechanical results were subjected to a one-way ANOVA and Tukey test (p<0.05). In compression, quartz fibre posts exhibited the greater maximum load and ultimate strength, carbon fibre posts showed a poor compressive behaviour. All posts had similar compressive moduli. Carbon posts showed the highest flexural properties (p<0.0001) while glass posts the greater maximum load. The fracture load values correlated to the diameters of posts showed a parabolic behaviour. The flexural strengths of all posts were four and seven times higher than dentine. The elastic moduli of almost all posts were similar to dentine. The compressive strengths were lower than flexural strengths. The fibre diameters ranged from 5.2 to 26 μm, the volume percentage of fibres was about 64%. The content of voids of some posts lower their mechanical behaviour.
Compressive properties of FRC posts were lower than in bending. The flexural properties of FRC posts were higher than the metal post and similar to dentine. The mechanical behaviour is influenced by voids.
本研究旨在研究五种纤维增强复合材料（FRC）桩的力学性能，并将其与传统金属桩进行比较。
将五种 FRC 桩和一种具有不同几何形状和纤维类型（玻璃纤维、碳纤维或石英纤维）的金属桩进行压缩和弯曲破坏试验。使用扫描电子显微镜（SEM）观察 FRC 桩的横截面，以评估断裂模式和纤维百分比（与燃烧试验相比）。还评估了密度和空隙含量。
机械结果进行了单向方差分析和 Tukey 检验（p<0.05）。在压缩试验中，石英纤维桩表现出最大的极限载荷和极限强度，碳纤维桩表现出较差的抗压性能。所有的桩都有相似的抗压模量。碳纤维桩具有最高的弯曲性能（p<0.0001），而玻璃纤维桩的最大载荷较高。断裂载荷值与桩的直径呈抛物线关系。所有桩的弯曲强度均高于牙本质的四倍和七倍。几乎所有桩的弹性模量都与牙本质相似。压缩强度低于弯曲强度。纤维直径范围为 5.2 至 26 μm，纤维体积百分比约为 64%。一些桩的空隙含量较低，影响了其力学性能。
FRC 桩的压缩性能低于弯曲性能。FRC 桩的弯曲性能高于金属桩，与牙本质相似。机械性能受空隙的影响。
