Effect of photo core, LuxaCore, and core max II core building materials on fracture resistance of endodontically‑treated teeth restored with fiber‑reinforced composite posts and ParaPosts

Abstract

Background: Post and core treatment is commonly performed for endodontically treated
teeth to replace the lost tooth structure and reinforce and protect the remaining dental tissue.
This study aimed to compare the effect of three‑core building materials on fracture resistance of
endodontically‑treated teeth restored with fiber‑reinforced composite (FRC) posts and ParaPosts.
Materials and Methods: This in vitro, experimental study evaluated 108 sound, single‑rooted
mandibular first premolars extracted for orthodontic purposes. The teeth were randomly divided
into nine groups (n = 12) of control (no endodontic or restorative treatment), FRC + Photo
Core (Group 2), FRC + LuxaCore (Group 3), FRC + Core Max II with bonding agent (Group 4),
FRC + Core Max II without bonding agent (Group 5), ParaPost + Photo Core (Group 6),
ParaPost + LuxaCore (Group 7), ParaPost + Core Max II with bonding agent (Group 8), and
ParaPost + Core Max II without bonding agent (Group 9). The fracture resistance was measured by
applying the load at 45° angle relative to the longitudinal axis of the tooth with a crosshead speed
of 1 mm/min using a universal testing machine. Data were through descriptive statistics, Tukey’s
test, and one‑way analysis of variance (α = 0.05).
Results: The mean fracture resistance was 454.0 ± 62.7, 410.8 ± 48.3, 365.1 ± 42.1, 423.7 ± 111.7,
392.4 ± 90.0, 292.3 ± 83.9, 242.3 ± 73.4, 278.2 ± 67.9, and 247.3 ± 49.6 N in Groups 1–9, respectively.
Group 4 showed the highest fracture resistance, which was significantly higher than this study the
value in all ParaPost and control groups (P < 0.05) but had no significant difference with the fracture
resistance of other groups (P > 0.05).
Conclusion: Fracture resistance is independent of the type of core building material used, and
the tested products had no superiority over each other. The mean fracture resistance of FRC post
groups were significantly higher than that of ParaPost groups. Furthermore, Core Max II + bonding
agent yielded insignificantly higher fracture resistance than Core Max II without bonding agent.