The Effect of Fiber-reinforced Composite and Cast Metal Post on the Failure Load and the Fracture Patterns of a Cylindrical Glass-resin Bilayer Structure : A Pilot Study
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Abstract
The study aims to develop a simple biomechanics model to identify a relationship of post materials without bonding agent on failure load and fracture patterns of a glass-resin bilayer under axial applied load. The geometries of cylindrical glass were prepared as a certain degree of convergence. Posts were positioned upright at the middle of glass cylinder, then filled with composite resin. Thirty cylindrical root- like structures were randomly divided into 3 groups (n=10): no post group (C), fiber-reinforced composite post group (FP) and cast metal post group (MP). A universal testing machine was used to apply a static load at a crosshead speed of 0.5 mm/min until the load reached 300 N and continued at a crosshead speed of 0.01 mm/min until the specimens fractured. The entire loading and fracture processes were recorded by video camera. The scatter of the initial failure load was evaluated using Tukey’s multiple comparison test (p<.05), Weibull’s analysis and a probability of survival. The results showed that the glass-resin bilayer models can simulate the vertical crack. The initial failure load in the post- reinforced group were significantly higher than the control group. No differences on the survival probability regardless of the types of posts under the load of 850 N. FP group revealed the higher survival probability than the MP group over the loading of 850 N.
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