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Microtensile bond strength of resin composite to dentin treated with Er:YAG laser of bleached teeth

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Abstract

The objective of this study was to evaluate the influence of Er:YAG laser (λ = 2.94 μm) on microtensile bond strength (μTBS) and superficial morphology of bovine dentin bleached with 16% carbamide peroxide. Forty bovine teeth blocks (7 × 3 × 3 mm3) were randomly assigned to four groups: G1- bleaching and Er:YAG irradiation with energy density of 25.56 J/cm2 (focused mode); G2 - bleaching; G3 - no-bleaching and Er:YAG irradiation (25.56 J/cm2); G4 - control, non-treated. G1 and G2 were bleached with 16% carbamide peroxide for 6 h during 21 days. Afterwards, all blocks were abraded with 320 to 600-grit abrasive papers to obtain flat standardized dentin surfaces. G1 and G3 were Er:YAG irradiated. Blocks were immediately restored with 4-mm-high composite resin (Adper Single Bond 2, Z-250-3 M/ESPE). After 24 h, the restored blocks (n = 9) were serially sectioned and trimmed to an hour-glass shape of approximately 1 mm2 at the bonded interface area, and tested in tension in a universal testing machine (1 mm/ min). Failure mode was determined at a magnification of 100× using a stereomicroscope. One block of each group was selected for scanning electron microscope (SEM) analysis. μTBS data was analyzed by two-way ANOVA and Tukey test (α = 0.05). Mean bond strengths (SD) in MPa were: G1- 32.7 (5.9)A; G2- 31.1 (6.3)A; G3- 25.2 (8.3)B; G4- 36.7 (9.9).A Groups with different uppercase letters were significantly different from each other (p < .05). Enamel bleaching procedure did not affect μTBS values for dentin adhesion. Er:YAG laser irradiation with 25.56 J/cm2 prior to adhesive procedure of bleached teeth did not affect μTBS at dentin and promoted a dentin surface with no smear layer and opened dentin tubules observed under SEM. On the other hand, Er:YAG laser irradiation prior to adhesive procedure of non-bleached surface impaired μTBS compared to the control group.

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Acknowledgements

The authors thank Ms. Mariane Brumatti (LCT POLI-USP- Technology Characterization Laboratory, University of São Paulo, Brazil) for technical support with electron microscopy.

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The authors have no interest in any of the companies or products mentioned in this article.

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Authors and Affiliations

  1. Department of Restorative Dentistry, School of Dentistry, Guarulhos University, Praça Teresa Cristina, 229, Centro, Guarulhos, SP, Brazil

    Eduardo dos Santos Leonetti, José Augusto Rodrigues, André Figueiredo Reis & Alessandra Cassoni

  2. Department of Restorative Dentistry, School of Dentistry, University Camilo Castelo Branco, São Paulo, Brazil

    Ricardo Scarparo Navarro

  3. Special Laboratory of Lasers in Dentistry (LELO), University of São Paulo, São Paulo, Brazil

    Ricardo Scarparo Navarro

  4. Department of Restorative Dentistry, School of Dentistry, Special Laboratory of Lasers in Dentistry (LELO), University of São Paulo, São Paulo, Brazil

    Ana Cecília Correa Aranha

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  1. Eduardo dos Santos Leonetti
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  2. José Augusto Rodrigues
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  3. André Figueiredo Reis
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  4. Ricardo Scarparo Navarro
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  5. Ana Cecília Correa Aranha
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Correspondence to Alessandra Cassoni.

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Leonetti, E.S., Rodrigues, J.A., Reis, A.F. et al. Microtensile bond strength of resin composite to dentin treated with Er:YAG laser of bleached teeth. Lasers Med Sci 27, 31–38 (2012). https://doi.org/10.1007/s10103-010-0838-1

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  • DOI: https://doi.org/10.1007/s10103-010-0838-1

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