Restor Dent Endod.  2024 May;49(2):e18. 10.5395/rde.2024.49.e18.

Effects of a relined fiberglass post with conventional and self-adhesive resin cement

• Junior WLdS
• Santi MR
• Lins RBE
• Martins LRM

• KMID: 2556547
• DOI: http://doi.org/10.5395/rde.2024.49.e18

Abstract

Objectives
This study was conducted to evaluate the mechanical properties of relined and non-relined fiberglass posts when cemented to root canal dentin using a conventional dualcure resin cement or a self-adhesive resin cement.
Materials and Methods
Two types of resin cements were utilized: conventional and selfadhesive. Additionally, 2 cementation protocols were employed, involving relined and non-relined fiberglass posts. In total, 72 bovine incisors were cemented and subjected to push-out bond strength testing (n = 10) followed by failure mode analysis. The cross-sectional microhardness (n = 5) was assessed along the root canal, and interface analyses (n = 3) were conducted using scanning electron microscopy (SEM). Data from the push-out bond strength and cross-sectional microhardness tests were analyzed via 3-way analysis of variance and the Bonferroni post-hoc test (α = 0.05).
Results
For non-relined fiberglass posts, conventional resin cement exhibited higher pushout bond strength than self-adhesive cement. Relined fiberglass posts yielded comparable results between the resin cements. Type II failure was the most common failure mode for both resin cements, regardless of cementation protocol. The use of relined fiberglass posts improved the cross-sectional microhardness values for both cements. SEM images revealed voids and bubbles in the incisors with non-relined fiberglass posts.
Conclusions
Mechanical properties were impacted by the cementation protocol. Relined fiberglass posts presented the highest push-out bond strength and cross-sectional microhardness values, regardless of the resin cement used (conventional dual-cure or selfadhesive). Conversely, for non-relined fiberglass posts, the conventional dual-cure resin cement yielded superior results to the self-adhesive resin cement.

Keyword

Cementation; Dentin; Resin cements; Root canals

Figure

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  Figure 1 Distribution of failure mode according to the resin cement and cementation protocol.Here, I (dark blue) indicates adhesive failure between the fiberglass post (FGP) and resin cement. II (orange) represents adhesive failure between the resin cement and dentin. III (gray) corresponds to cohesive failure of the resin cement, while IV (yellow) denotes cohesive failure of the FGP. Finally, V (light blue) indicates mixed failure. The percentages (in parentheses) reflect the proportion of each failure mode observed.

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  Figure 2 Scanning electron microscopy images (×35) showcasing the interface analyses.*, resin cement; RC, resin composite; FGP, fiberglass post; arrows, bubbles.

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