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Use of an applicator brush with high concentration bleaching gels

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Abstract

Objectives

To evaluate in vitro two high concentration self-mix bleaching gels (35% or 37.5%) with different application tips (with or without an applicator brush) during in-office bleaching.

Materials and methods

Healthy premolars were randomly assigned to five groups (n = 8): no treatment; 35% HP without applicator brush, 35% HP with applicator brush, 37.5% HP without applicator brush, and 37.5% HP with applicator brush. After the procedures, the concentration of HP transferred into the pulp chamber was evaluated using UV–Vis. The amount of gel used in each group was measured on a precision analytical balance. Color change (ΔEab, ΔE00, and ΔWID) was evaluated with a digital spectrophotometer. Initial concentration was measured by titration with potassium permanganate. The pH was evaluated using a digital pH meter. The data from each test were submitted to nonparametric tests (α = 0.05).

Results

Using a tip with an applicator brush expended less gel and left a lower amount of HP inside the pulp chamber compared to the tip without a brush for both bleaching gels (p < 0.0003), although no significant difference in color change was observed (p < 0.05). The 37.5% HP showed a more stable and less acidic pH and a lower amount of HP in the pulp chamber than the 35% HP (p < 0.00001).

Conclusion

The HP penetration into the pulp chamber was lower when using an applicator with a brush tip than when using one with a conventional tip. As for the color, both tips were considered to lighten teeth.

Clinical significance

For the application of a self-mixing high concentration in-office bleaching gel, a brush tip should be recommended because its use diminishes the penetration of HP into the pulp chamber and wastes less bleaching gel.

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Acknowledgements

The authors would like to thank FGM Dental Group (Brazil), SDI (Australia), and Sulzer (Switzerland) for the generous donation of the bleaching and tips products employed in this study.

Funding

This study was partially supported by the National Council for Scientific and Technological Development (CNPq) under grants 303332/2017–4 and 305588/2014–1 as well as the Coordination of Improvement of Higher-Level Personnel (CAPES; no. 001).

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Authors and Affiliations

  1. Department of Restorative Dentistry, Dental Post-Graduate Program, State University of Ponta Grossa, Rua Carlos Cavalcanti, Bloco M - Uvaranas, Ponta Grossa, Parana, 4748, Brazil

    Laís G. Bernardi, Michael W. Favoreto, Taynara S. Carneiro, Alessandra Reis & Alessandro D. Loguercio

  2. Department of Dentistry, Universidad de Las Américas, Quito, Ecuador

    Alexandra Mena-Serrano

  3. Department of Chemistry, State University of Ponta Grossa, Parana, Brazil

    Christiane P. F. Borges

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  1. Laís G. Bernardi
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  2. Michael W. Favoreto
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  3. Taynara S. Carneiro
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  4. Alexandra Mena-Serrano
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  5. Christiane P. F. Borges
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  6. Alessandra Reis
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  7. Alessandro D. Loguercio
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Corresponding author

Correspondence to Alessandro D. Loguercio.

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This study was submitted for approval by the Research Ethics Committee of the State University of Ponta Grossa (#4.647.755) and was carried out at the same university.

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Bernardi, L.G., Favoreto, M.W., Carneiro, T.S. et al. Use of an applicator brush with high concentration bleaching gels. Clin Oral Invest 26, 6387–6395 (2022). https://doi.org/10.1007/s00784-022-04594-8

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