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01-04-2015 | Original Article

Color alteration, hydrogen peroxide diffusion, and cytotoxicity caused by in-office bleaching protocols

Authors: Letícia Cunha Amaral Gonzaga de Almeida, Diana Gabriela Soares, Marjorie Oliveira Gallinari, Carlos Alberto de Souza Costa, Paulo Henrique dos Santos, André Luiz Fraga Briso

Published in: Clinical Oral Investigations | Issue 3/2015

Abstract

Objectives

This study evaluated the color alteration, cytotoxicity, and hydrogen peroxide (HP) diffusion associated with different in-office bleaching protocols.

Materials and methods

Bovine enamel/dentin disks were subjected to three bleaching sessions with 35 % HP (three 15-min applications), 35 % HP (one 45-min application), or 20 % HP (one 45-min application). The control group was not bleached. Before bleaching, the disks were adapted to artificial pulp chambers positioned in compartments containing 1 ml of acetate buffer or medium, so that the dentin remained in contact with these substances. Immediately after bleaching, the HP that diffused through the disks was stabilized by acetate buffer and was quantified (two-way repeated measures ANOVA/Fisher’s protected least significant difference (PLSD) test; α = 5 %). Cells of mouse dental papilla cell-23 (MDPC-23) were incubated in this culture media for 1 h, followed by analysis of cellular metabolism (methyl tetrazolium assay) (one-way ANOVA/Tukey test; α = 5 %) and morphology (scanning electron microscopy). The specimen color alteration (ΔE) was analyzed by reflection spectrophotometry (two-way repeated measures ANOVA/Fisher’s PLSD test; α = 5 %).

Results

All protocols showed equal effectiveness at the end of the treatment. HP diffusion was significantly higher in the groups bleached with 35 % HP. Reapplication of 35 % HP resulted in increased diffusion only in the first session; however, the decrease in cell metabolism was similar for all studied protocols.

Conclusion

Despite greater peroxide diffusion in the groups treated with 35 % HP, all protocols showed the same effectiveness and were cytotoxic to MDPC-23 cells.

Clinical relevance

Bleaching protocols using high HP concentrations should be avoided because they exert aggressive actions on odontoblast-like cells.

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Title: Color alteration, hydrogen peroxide diffusion, and cytotoxicity caused by in-office bleaching protocols
Authors: Letícia Cunha Amaral Gonzaga de Almeida
Diana Gabriela Soares
Marjorie Oliveira Gallinari
Carlos Alberto de Souza Costa
Paulo Henrique dos Santos
André Luiz Fraga Briso
Publication date: 01-04-2015
Publisher: Springer Berlin Heidelberg
Published in: Clinical Oral Investigations / Issue 3/2015
Print ISSN: 1432-6981
Electronic ISSN: 1436-3771
DOI: https://doi.org/10.1007/s00784-014-1285-3

Keynote webinar | Spotlight on medication adherence

Springer Medicine

Color alteration, hydrogen peroxide diffusion, and cytotoxicity caused by in-office bleaching protocols

Abstract

Objectives

Materials and methods

Results

Conclusion

Clinical relevance

Keynote webinar | Spotlight on medication adherence

Springer Medicine

Abstract

Objectives

Materials and methods

Results

Conclusion

Clinical relevance

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