In Vitro Repair of Fractured Fiber-Reinforced Cusp-Replacing Composite Restorations
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 experi...
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| Main Authors: | , , , , , |
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| Format: | Book |
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Hindawi Limited,
2011-01-01T00:00:00Z.
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| Summary: | 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. |
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| Item Description: | 1687-8728 1687-8736 10.1155/2011/165938 |