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Clinical Oral Investigations

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01-11-2017 | Original Article

Influence of enamel/dentin thickness on the toxic and esthetic effects of experimental in-office bleaching protocols

Authors: C.C. de Oliveira Duque, D.G. Soares, F.G. Basso, J. Hebling, C.A. de Souza Costa

Published in: Clinical Oral Investigations | Issue 8/2017

Abstract

Objectives

This paper aims to assess the whitening effectiveness and toxicity of tooth-bleaching protocols applied to enamel/dentin disks simulating mandibular incisors (ICs) and premolars (PMs).

Materials and methods

A 10% hydrogen peroxide (H₂O₂) gel was applied for 3 × 15, 1 × 15, or 1 × 5 min to enamel/dentin disks simulating mandibular ICs and PMs, and the trans-enamel and trans-dentinal diffusion products were applied to human dental pulp cells (1 h). Professional therapy (35% H₂O₂—3 × 15 min) was used as positive control, and non-bleached samples were used as negative control. Cell viability and morphology, oxidative stress generation, and odontoblastic marker expression were assessed. The H₂O₂ diffusion and enamel color change (ΔE) were also analyzed.

Results

The 10% H₂O₂ gel induced significant cell viability reduction only when applied 3 × 15 min, with the intensity of oxidative stress and down-regulation of odontoblastic markers being higher in the IC group. The other experimental bleaching protocols caused slight alterations regarding the cell parameters evaluated, with intensity being related to enamel/dentin thickness. These effects were also correlated with higher H₂O₂ diffusion in the IC group. ΔE values similar as positive control were found for the 10% 3 × 15 and 1 × 15 protocols on IC group, after 4 and 6 sessions.

Conclusion

Application of a 10% H₂O₂ bleaching gel for 15 or 45 min to thin dental substrate significantly minimizes cell toxicity in comparison with highly concentrated gels associated with similar esthetic outcomes by increasing the number of bleaching sessions.

Clinical relevance

Bleaching gels with 10% H₂O₂ applied in small teeth for short periods may be an interesting alternative to obtain whitening effectiveness without causing toxicity to pulp cells, which may be able to reduce the tooth hypersensitivity claimed by patients.

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Title: Influence of enamel/dentin thickness on the toxic and esthetic effects of experimental in-office bleaching protocols
Authors: C.C. de Oliveira Duque
D.G. Soares
F.G. Basso
J. Hebling
C.A. de Souza Costa
Publication date: 01-11-2017
Publisher: Springer Berlin Heidelberg
Published in: Clinical Oral Investigations / Issue 8/2017
Print ISSN: 1432-6981
Electronic ISSN: 1436-3771
DOI: https://doi.org/10.1007/s00784-017-2049-7

2024 ASCO Annual Meeting

Springer Medicine

Influence of enamel/dentin thickness on the toxic and esthetic effects of experimental in-office bleaching protocols

Abstract

Objectives

Materials and methods

Results

Conclusion

Clinical relevance

2024 ASCO Annual Meeting

Springer Medicine

Abstract

Objectives

Materials and methods

Results

Conclusion

Clinical relevance

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