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In vitro bond strength of an epoxy resin-based root canal sealer to root dentin irradiated with high-power lasers and adhesive interface analyses

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Abstract

The aim of this study was to evaluate in vitro the influence of high-power lasers (Nd:YAG and diode 980 nm) associated with mineral coal as fotopotencializer on bond strength of an epoxy resin-based root canal sealer to root dentin, using the pushout test, and on the dentin/filling material interface, using confocal laser microscopy. For this purposes, 50 canines were instrumented with Mtwo rotary system up to #50.04 instrument and randomly assigned to five groups (n = 10): group I—control EDTAC; group II—EDTAC and Nd:YAG laser; group III—EDTAC and diode laser 980 nm; group IV—EDTAC, Nd:YAG laser and mineral coal 5 g/100 mL; and group V—EDTAC, diode laser 980 nm and mineral coal 5 g/100 mL. All data were analyzed by ANOVA (at 5% significance level) following the Kruskal-Wallis, Dunn and Tukey tests. The group I increased more bond strength of the sealer to root dentin that treated with only EDTAC 17% (17.21 ± 21.75 MPa), similar to the group II (12.21 ± 18.20 MPa) and group IV (14.92 ± 28.06 MPa), both treated with Nd:YAG laser, with the exception of group IV, which was added to mineral coal. The group V (8.75 ± 13.42 MPa) had similar results to the groups II and IV, but the same similarity were found when compared with group III (7.11 + 11.28 MPa), with lower results. Regarding the root thirds, the apical third (23.27 ± 29.21 MPa) presented a statistically higher value on bond strength than the cervical third (5.92 ± 5.33 MPa) and middle third (6.93 ± 7, 11 MPa) (p > 0.05). Group II (86.27 μm) showed the highest tags penetration values, with a statistically difference to the group III (51.57 μm), IV (36.77 μm) and V (32.37 μm) (p < 0.05). Group I (71.63 μm) was statistically similar to groups II and III (p > 0.05). Group IV had the lowest values and was statistically similarity to groups III and V (p > 0.05). It was concluded that the treatment with Nd:YAG laser provides better results than the diode 980 nm laser, except when was added mineral coal. The control and diode 980 nm laser groups presented less adhesive failures and more mists failures than the other groups. Both lasers did not interfere negatively compared to the control group.

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Acknowledgement

University of São Paulo supported the facilities and equipment used to carry out the present work.

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Authors and Affiliations

  1. Department of Restorative Dentistry, School of Dentistry of Ribeirão Preto, University of São Paulo, Av do Café sn, Ribeirão Preto, SP, 14040-904, Brazil

    Vanessa Lessa C. Araujo, Pedro Basto Cruvinel, Regina Guenka Palma-Dibb & Ricardo Gariba-Silva

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  1. Vanessa Lessa C. Araujo
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  2. Pedro Basto Cruvinel
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  3. Regina Guenka Palma-Dibb
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  4. Ricardo Gariba-Silva
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Correspondence to Regina Guenka Palma-Dibb.

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The authors declare that they have no conflict of interest.

Ethical approval

Experiments were conducted following the guidelines of Resolution 466/12 of Brazil Health Ministery. Protocol CAAE: 34232414.8.0000.5419.

Informed consent

The teeth were donated by the Biobank teeth of Ribeirão Preto Dental School–FORP/USP.

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Araujo, V.L.C., Cruvinel, P.B., Palma-Dibb, R.G. et al. In vitro bond strength of an epoxy resin-based root canal sealer to root dentin irradiated with high-power lasers and adhesive interface analyses. Lasers Med Sci 33, 271–277 (2018). https://doi.org/10.1007/s10103-017-2362-z

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  • DOI: https://doi.org/10.1007/s10103-017-2362-z

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