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Influence of different endodontic sealers on bond strength of fiber posts to weakened roots after resin restoration

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Abstract

Objectives

To assess the influence of different sealers used in root canal filling, in terms of bond strength (BS) to dentin, after restoration of weakened roots using resin composite (RC) and fiber posts.

Material and methods

Roots of 39 maxillary incisors were used. After root canal preparation, root dentin was flared to produce a space between fiber post and root canal walls. The root canals were randomly distributed into three groups (n = 13), according to the sealer used: Endofill, AH Plus, and Acroseal. After removing the filling material to a depth of 12 mm, the flared roots were adhesively restored using RC. Posts were cemented and, after 24 h, roots were sectioned transversely producing 1-mm-thick slices. The slices from 30 roots were used for push-out test, and failure modes were noted. The remaining slices were analyzed by scanning electron microscopy (SEM).

Results

Statistical analysis by 2-way ANOVA showed a significant difference among sealers (p = 0.001) and among root regions (p < 0.001). The BS mean of Endofill was lower and significantly different from the others. Overall, the coronal region presented higher BS mean values, followed by the middle and apical regions of the reinforced roots. The most frequent failure type was the adhesive failure between RC and dentin. SEM analysis showed the formation of a hybrid layer and many tags in the coronal and middle regions, while the apical region exhibited remnants of the endodontic sealers in all groups.

Conclusions

AH Plus and Acroseal sealer groups presented similar results, and the Endofill sealer negatively affected the BS of fiber post to restored root dentin.

Clinical relevance

Weakened dentin walls are often found in teeth undergoing endodontic treatment, so the sealer used must allow or at least not interfere the bonding between restorative materials and root dentin.

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Acknowledgments

The authors are grateful to the Central Laboratory for Electron Microscopy (LCME) of the Federal University of Santa Catarina for performing the SEM images.

Funding

This study was supported partly by a scholarship grant provided by the Research Funding Agency of Santa Catarina State “FAPESC.”

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Authors

Contributions

All authors contributed to the study conception and design, especially Cleonice Silveira Teixeira and Guilherme Carpena Lopes. Material preparation, data collection, and analysis were performed by Georgia Linhares dos Santos, Suélen Maciel Suzin, Ihan Vítor Cardoso, and Andressa Ballarin. The first draft of the manuscript was written by Cleonice Silveira Teixeira and Geórgia Linhares dos Santos. All authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.

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Correspondence to Cleonice Silveira Teixeira.

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dos Santos, G.L., Cardoso, I.V., Suzin, S.M. et al. Influence of different endodontic sealers on bond strength of fiber posts to weakened roots after resin restoration. Clin Oral Invest 25, 4125–4135 (2021). https://doi.org/10.1007/s00784-020-03744-0

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