Resin composite adhesion to dentin using different curing lights and adhesive systems applied under electric current

Abstract

Objectives

To evaluate the effect of electric current application on the resin composite-tooth bond strength and hybrid layer of three adhesive systems light-cured by two light-curing units (LCUs).

Materials and methods

Human molar teeth were distributed into 12 groups (n=6). Three adhesive systems were used: two-step etch-and-rinse (SB2; Adper Single Bond 2, 3M ESPE); two-step self-etch (CSE; Clearfil SE Bond, Kuraray); and one-step self-etch (SBU; Single Bond Universal, 3M ESPE) applied with (50μA) and without (control; conventional application) electric current, and light-cured with different LCUs. Resin composite blocks (Filtek Z350XT, 3M ESPE) were produced and cut into sticks (~1mm2) for microtensile bond strength (μTBS). Fracture patterns were analyzed on stereomicroscope and classified as cohesive-dentin, cohesive-resin, adhesive, or mixed. Specimens were prepared for scanning electron microscope observation. The hybrid layer analysis was carried out using a confocal laser scanning microscopy (n=2). Data were submitted to three-way ANOVA followed by Tukey’s post hoc test (α=0.05).

Results

The electric current increased the μTBS for all adhesive systems light-cured with single-emission peak and multiple-emission peak LCUs. Both LCUs presented similar μTBS values. CSE applied under electric current showed the highest μTBS mean values. The adhesive failure pattern was more frequently observed in all groups. The electric current formed long resin tags for all adhesive systems.

Conclusions

The adhesive systems applied under electric current increased the bond strength using single-emission peak and multiple-emission peak LCUs.

Clinical relevance

Electric current at 50μA applied throughout the dentin is a safe mode and results in better impregnation of the adhesive systems.

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Funding

The work was supported by the School of Dentistry, University of Taubate and Piracicaba Dental School, University of Campinas.

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Correspondence to Rafael Pino Vitti.

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This article does not contain any studies with human participants or animals performed by any of the authors. All procedures performed involving human waste were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.

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Maciel, C.M., da Rosa Rinhel, M.F., Abuna, G.F. et al. Resin composite adhesion to dentin using different curing lights and adhesive systems applied under electric current. Clin Oral Invest (2021). https://doi.org/10.1007/s00784-021-03824-9

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Keywords

  • Bond strength
  • Dentin
  • Electrical current
  • Resin composite
  • Hybrid layer