Influence of Cement Type and Relining Procedure on Push-Out Bond Strength of Fiber Posts after Cyclic Loading

• Published in: Journal of prosthodontics Vol. 25; no. 1; pp. 54 - 60
• Main Authors: Farina, Ana Paula, Chiela, Henrique, Carlini-Junior, Bruno, Mesquita, Marcelo Ferraz, Miyagaki, Daniela Cristina, Randi Ferraz, Caio Cezar, Vidal, Cristina Mattos Pimenta, Cecchin, Doglas
• Format: Journal Article
• Language: English
• Published: United States Blackwell Publishing Ltd 01-01-2016
• Subjects: Animals; Bond strength; Cattle; cyclic loading; Dental Bonding; Dental Cements; Dentin; Dentistry; fiber post; Glass Ionomer Cements; Materials Testing; Post and Core Technique; resin cement; Resin Cements; root canal; Bond strength; fiber post; cyclic loading; resin cement; root canal
• ISSN: 1059-941X; 1532-849X
• DOI: 10.1111/jopr.12271

Purpose
The aim of this study was to evaluate the influence of cement type and relining procedure on push‐out bond strength of fiber posts (FPs) after cyclic loading.
Materials and Methods
Forty bovine incisor roots were divided into four groups: group 1, FP luting with RelyX Unicem; group 2, FP relined with resin composite (FPC) luting with RelyX Unicem; group 3, FP luting with RelyX ARC; group 4, FPC luting with RelyX ARC. Afterwards, half the specimens were exposed to 250,000 cycles in a controlled chewing simulator. With the other half of the specimens in each group, the push‐out test was performed 24 hours after FP luting (immediate groups). All roots were sectioned transversely, producing 1‐mm‐thick slices, and the push‐out test was performed. Statistical analysis was performed using ANOVA and the Tukey test for post hoc comparisons (α = 0.05).
Results
FPC had higher bond strengths than FP (p < 0.05). RelyX Unicem showed higher bond strength than RelyX ARC (p < 0.05). Cyclic loading did not significantly affect the bond strength value (p > 0.05).
Conclusion
The relining procedure and the cement type are important factors for the bond strength of FPs to root dentin.