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Dentin pretreatment with Er:YAG laser and sodium ascorbate to improve the bond strength of glass fiber post

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Abstract

Root-filled teeth that received fiber posts most frequently fail at the adhesive interface between resin cement and dentin. The objective of this study is to evaluate the effect of Er:YAG laser and/or sodium ascorbate (SA) on bond strength, microhardness of dentin, and penetration depth of cement into dentinal tubules. Forty-eight bovine incisor roots were endodontically treated, post spaces were prepared and equally divided into four groups (n = 12): G1—distilled water (control); G2—10% SA (10 min); G3—Er:YAG laser (150 mJ/4 Hz/40 s), and G4—Er:YAG laser + 10% SA. Glass fiber posts were cemented and roots sectioned into slices. In the first slice, the push-out bond strength (MPa) and failures were analyzed by confocal laser scanning microscope (CLSM). The second slice was subjected to microhardness test (KHN) and CLSM to assess the cement penetration. ANOVA and Tukey test were used for bond strength and microhardness data and Kruskal-Wallis and Dunn tests for the cement penetration (α = .05). The SA-treated samples had higher bond strength (10.02 ± 5.45a), similar to Er:YAG laser (9.91 ± 4.62a) and Er:YAG laser + SA (8.09 ± 4.07a). The least values (P < .05) were found on control (4.02 ± 2.39b). Significant differences were observed on root thirds (P < .05): cervical > middle > apical. There was a predominance of adhesive failures. The microhardness test revealed no differences between groups (P > .05). The experimental groups (G2, G3, and G4) had highest penetration into dentinal tubules when compared to the control (G1). Dentin pretreatments with Er:YAG laser or SA improved bond strength of cement-post-dentin interfaces; however, no synergistic effect of both treatments combined was observed.

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Acknowledgments

The authors would like to thank the State of São Paulo Research Foundation (FAPESP) for the scholarship awarded (grant 2016/12960-7).

Funding

This study was funded by State of São Paulo Research Foundation (FAPESP) (grant 2016/12960-7).

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Authors and Affiliations

  1. School of Dentistry of Ribeirão Preto, University of São Paulo, Av. Café s/n, Monte Alegre, CEP 14040-904, Ribeirão Preto, São Paulo, Brazil

    Laís Lima Pelozo, Reinaldo Dias Silva-Neto, Silmara Aparecida Milori Corona, Regina Guenka Palma-Dibb & Aline Evangelista Souza-Gabriel

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  1. Laís Lima Pelozo
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  2. Reinaldo Dias Silva-Neto
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  3. Silmara Aparecida Milori Corona
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  5. Aline Evangelista Souza-Gabriel
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Correspondence to Aline Evangelista Souza-Gabriel.

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Additional information

Clinical significance: The pretreatment of post space with Er:YAG laser and/or sodium ascorbate antioxidant agent can transform the intraradicular dentin to a substrate more receptive to adhesive procedures.

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Pelozo, L.L., Silva-Neto, R.D., Corona, S.A.M. et al. Dentin pretreatment with Er:YAG laser and sodium ascorbate to improve the bond strength of glass fiber post. Lasers Med Sci 34, 47–54 (2019). https://doi.org/10.1007/s10103-018-2579-5

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  • DOI: https://doi.org/10.1007/s10103-018-2579-5

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