Fracture resistance, two point bending strength and morphological characteristics of pulpless teeth restored with fiber-reinforced composite posts

Resumo

Fiber-reinforced composite posts (FRC posts) have
been used for tooth reinforcement after endodontic treatment. The
mechanical characteristics of FRC posts can influence the clinical
prognostic. Objective: The aim of this study was to evaluate the
flexural strength and fracture resistance of commercially available
FRC posts Material and methods: Fourteen human single-rooted
premolars with completely formed apices were selected and received
endodontic treatment. The specimens were divided into two groups
related to the post system: i) Group A – cylindrical-conical fiberreinforced post (White post DC, FGM), and ii) group B – conical
fiber-reinforced post (EXACTO, Angelus). The fracture resistance
was evaluated and two point bending tests were carried out. The
glass fiber characteristics and the tag penetration of the luting
material into the radicular dentin structure were evaluated through
scanning electronic microscopy in an illustrative way. One-way
ANOVA and Tukey’s HSD test (α = 0.05) were applied. Results: The values obtained for fracture resistance and two point bending test
were, respectively, 399.29 N and 109.5 N for group A, and 386.25
N and 119.5 N for group B. No significant differences in strength
values among the groups were found. Conclusion: There were
no significant statistical differences between the two post groups
regarding to fracture strength and two point bending strength. It
can be concluded that the posts selected for this study performed
satisfactorily in terms of mechanical properties so that they can be
used for tooth reinforcement after endodontic treatment.