In Vitro Repair of Fractured Fiber-Reinforced Cusp-Replacing Composite Restorations

الملخص EN

Objective.

To assess fracture resistance and failure mode of repaired fiber-reinforced composite (FRC) cusp-replacing restorations.

Methods.

Sixteen extracted human premolars with fractured cusp-replacing woven (Group (A)) or unidirectional (Group (B)) FRC restorations from a previous loading experiment were repaired with resin composite and loaded to fracture.

Results.

Differences in fracture loads between groups were not statistically significant (P = 0.34).

Fracture loads of repaired specimens were significantly lower than those of original specimens (P = 0.02 for Group (A) and P < 0.001 for Group (B)).

Majority of specimens showed failure along the repaired surface.

In Group (B) 89% of specimens showed intact tooth substrate after restoration fracture, while this was 28% in Group (A) (P = 0.04).

Conclusion.

Fractured cusp-replacing FRC restorations that are repaired with resin composite show about half of fracture resistance of original restorations.

Mode of failure with a base of unidirectional fibers is predominantly adhesive.