Abstract
Abstract Objective This study aimed to evaluate the fracture load and displacement of roots restored with posts of different elastic modulus. Material and method Thirty-six replicas of epoxy resin mixed with glass microfibers were made from an endodontically-treated human premolar root prepared to a length of 12 mm with a custom drill, leaving the apical 4 mm unprepared. Replicas were randomly restored with (n = 12): FP-LM (fiber post with low elastic modulus– 50 GPa), FP-HM (fiber post with high elastic modulus – 67 GPa) and MP (metallic post – 208 GPa), using self-curing adhesive and dual resin cement. Cores were built up with composite resin and metallic crowns were cemented in all the roots with self-adhesive resin cement with self-curing mode. Specimens were subjected to a fracture load test (45° inclination/0.5 mm/min) and displacement was registered at 100 N. Result One-way ANOVA showed that elastic modulus of the post did not affect the fracture load means (p = 0.203) (FP-LM: 237.4 ± 65.11 N; FP-HM: 236.7 ± 92.85 N; MP: 295.8 ± 108.7 N) but was statistically significant for the displacement (p < 0.00): Tukey’s test showed that FP-LM displacement mean (0.81 ± 0.15 mm) was significantly higher than those for FP-HM (0.46 ± 0.26 mm; p = 0.00) and MP (0.62 ± 0.07 mm; p = 0.04). Conclusion Posts with different elastic modulus exhibit similar fracture loads, but a lower displacement is achieved when fiber posts with a high elastic modulus and metallic posts are used.
Highlights
The proper esthetic and functional reconstruction of endodontically treated teeth is a crucial factor for long-term success of the rehabilitation[1]
Different post systems options with diverse elastic modulus are available for restoration of endodontically treated teeth
According to finite element analyses, such posts with an elastic modulus superior to that of dentin concentrate high stress on the radicular dentin, which may increase the risk of root fracture[6]
Summary
The proper esthetic and functional reconstruction of endodontically treated teeth is a crucial factor for long-term success of the rehabilitation[1]. The rigidity of the intracanal anchorage should be taken into consideration since it may influence the mechanical behavior of the restored endodontically treated teeth[6], most studies which evaluated the fracture strength of teeth restored with different post materials used diverse post systems with varied shapes and diameters[1,7,8], making it difficult to isolate the variable “post rigidity”. For this reason, this study focused on the evaluation of posts with the same format. The hypotheses tested were that different elastic modulus would generate similar fracture load and would not affect displacement of the restored teeth
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