E-ISSN 2548-0839
Influence of Different Fibreglass Post Geometries on the Stress Distribution and Pull-Out Bond Strength Before and After Mechanical Cycling [Eur Endod J]
Eur Endod J. 2021; 6(2): 170-176 | DOI: 10.14744/eej.2020.95967

Influence of Different Fibreglass Post Geometries on the Stress Distribution and Pull-Out Bond Strength Before and After Mechanical Cycling

Rossana Reim Delgaudio Pignataro, Renata De Paula Samico, Larissa Mendes Campaner, Marco Antonio Bottino, Alexandre Borges, Joćo Paulo Tribst
Department of Dental Materials and Prosthodontics, Institute of Science and Technology, Unesp, Sćo José dos Campos/SP, Brazil

Objective: There are no reports in the literature on whether FGP geometry influences the bond strength of the endodontically restored tooth. This study aimed to determine the stress distribution and the pull-out bond strength of different FGP geometries, before and after chewing loads simulation.
Methods: One hundred and twenty root analogues were prepared and randomly distributed in six groups according to the post geometry. Half of the specimens were aged in water at 37 °C using a mechanical fatigue machine (84 N, 2 bar, 45°, 106 cycles, 4 Hz); while the remaining specimens were immediately submitted to the pull-out bond strength test. The specimens were tested in a universal testing machine and the bond strength in MPa was calculated. To assess the stress concentration, the finite element method was used simulating the same post geometries that were used in the in vitro test.
Results: Two-way ANOVA (95%) showed no influence of post geometry on the bond strength (P=0.055) while fatigue cycling was statistical significant to reduce the bond strength values (P=0.000). The factors interaction was significant (P=0.019); however, TUKEY test (5%) showed no significant difference between post geometries after mechanical cycling. The tensile stress result showed critical areas in the post's cervical region regardless of the design.
Conclusion: The FGP geometry does not affect the root stress distribution and the long-term bond strength. However, FGP that allow a reduced cement layer thickness can improve the immediate pull-out bond strength value. (EEJ-2020-09-217)

Keywords: Finite element analysis, post and core technique, resin cement, tensile strength

Rossana Reim Delgaudio Pignataro, Renata De Paula Samico, Larissa Mendes Campaner, Marco Antonio Bottino, Alexandre Borges, Joćo Paulo Tribst. Influence of Different Fibreglass Post Geometries on the Stress Distribution and Pull-Out Bond Strength Before and After Mechanical Cycling. Eur Endod J. 2021; 6(2): 170-176

Corresponding Author: Joćo Paulo Tribst
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