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Clinical Oral Investigations

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Open Access 01-06-2021 | Bleaching | Original Article

Do bleaching gels affect the stability of the masking and caries-arresting effects of caries infiltration—in vitro

Authors: Ellen Elisabeth Jansen, Hendrik Meyer-Lueckel, Marcella Esteves-Oliveira, Richard Johannes Wierichs

Published in: Clinical Oral Investigations | Issue 6/2021

Abstract

Objectives

The aim of this study was to evaluate the influence of different bleaching gels on the masking and caries-arresting effects of infiltrated and non-infiltrated stained artificial enamel caries lesions.

Materials and methods

Bovine enamel specimens (n = 240) with each two sound areas (SI and SC) and each two lesions (DI and DC) were infiltrated (DI and SI), stained (1:1 red wine-coffee mixture,70 days), and randomly distributed in six groups to be bleached with the following materials: 6%HP (HP-6), 16%CP (CP-16), 35%HP (HP-35), 40%HP (HP-40), and no bleaching (NBl,NBl-NBr). Subsequently, specimens were pH-cycled (28 days, 6 × 60 min demineralization/day) and all groups except NBl-NBr were brushed with toothpaste slurry (1.100 ppm, 2×/day, 10 s). Differences in colorimetric values (ΔL, ΔE) and integrated mineral loss (ΔΔZ) between baseline, infiltration, staining, bleaching, and pH cycling were calculated using photographic and transversal microradiographic images.

Results

At baseline, significant visible color differences between DI and SC were observed (ΔE_baseline = 12.2; p < 0.001; ANCOVA). After infiltration, these differences decreased significantly (ΔE_infiltration = 3.8; p < 0.001). Staining decreased and bleaching increased ΔL values significantly (p ≤ 0.001). No significant difference in ΔΔE was observed between before staining and after bleaching (ΔE_bleaching = 4.3; p = 0.308) and between the bleaching agents (p = 1.000; ANCOVA). pH-cycling did not affect colorimetric values (ΔE_pH-cycling = 4.0; p = 1.000). For DI, no significant change in ΔZ during in vitro period was observed (p ≥ 0.063; paired t test).

Conclusions

Under the conditions chosen, the tested materials could satisfactorily bleach infiltrated and non-infiltrated stained enamel. Furthermore, bleaching did not affect the caries-arresting effect of the infiltration.

Clinical relevance

The present study indicates that bleaching is a viable way to satisfactorily recover the appearance of discolored sound enamel and infiltrated lesions.

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Title: Do bleaching gels affect the stability of the masking and caries-arresting effects of caries infiltration—in vitro
Authors: Ellen Elisabeth Jansen
Hendrik Meyer-Lueckel
Marcella Esteves-Oliveira
Richard Johannes Wierichs
Publication date: 01-06-2021
Publisher: Springer Berlin Heidelberg
Keywords: Bleaching
Caries
Published in: Clinical Oral Investigations / Issue 6/2021
Print ISSN: 1432-6981
Electronic ISSN: 1436-3771
DOI: https://doi.org/10.1007/s00784-020-03732-4

Keynote webinar | Spotlight on medication adherence

Springer Medicine

Do bleaching gels affect the stability of the masking and caries-arresting effects of caries infiltration—in vitro

Abstract

Objectives

Materials and methods

Results

Conclusions

Clinical relevance

Keynote webinar | Spotlight on medication adherence

Springer Medicine

Abstract

Objectives

Materials and methods

Results

Conclusions

Clinical relevance

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