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Clinical Oral Investigations

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01-12-2015 | Original Article

Dental discoloration caused by bismuth oxide in MTA in the presence of sodium hypochlorite

Authors: Marina Angélica Marciano, Marco Antonio Hungaro Duarte, Josette Camilleri

Published in: Clinical Oral Investigations | Issue 9/2015

Abstract

Objectives

The aim of this research was to analyse the dental discolouration caused by mineral trioxide aggregate (MTA) induced by bismuth oxide and also assess the colour stability of other dental cements.

Materials and methods

Bismuth oxide, calcium tungstate and zirconium oxide were placed in contact with sodium hypochlorite for 24 h after which they were dried and photographed. Phase analyses were performed by X-ray diffraction (XRD) of radiopacifiers before and after immersion in sodium hypochlorite. Furthermore, teeth previously immersed in water or sodium hypochlorite were filled with MTA Angelus, Portland cement (PC), PC with 20 % zirconium oxide, PC with 20 % calcium tungstate and Biodentine. Teeth were immersed for 28 days in Hank’s balanced salt solution after which they were sectioned and characterized using scanning electron microscopy (SEM) with energy-dispersive mapping and stereomicroscopy.

Results

Bismuth oxide in contact with sodium hypochlorite exhibited a change in colour from light yellow to dark brown. XRD analysis demonstrated peaks for radiopacifier and sodium chloride in samples immersed in sodium hypochlorite. The SEM images of the dentine to material interface showed alteration in material microstructure for MTA Angelus and Biodentine with depletion in calcium content in the material. The energy-dispersive maps showed migration of radiopacifier and silicon in dentine.

Conclusions

MTA Angelus in contact with a tooth previously immersed in sodium hypochlorite resulted in colour alteration at the cement/dentine interface.

Clinical relevance

MTA Angelus should not be used after irrigation with sodium hypochlorite as this will result in tooth discoloration.

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Title: Dental discoloration caused by bismuth oxide in MTA in the presence of sodium hypochlorite
Authors: Marina Angélica Marciano
Marco Antonio Hungaro Duarte
Josette Camilleri
Publication date: 01-12-2015
Publisher: Springer Berlin Heidelberg
Published in: Clinical Oral Investigations / Issue 9/2015
Print ISSN: 1432-6981
Electronic ISSN: 1436-3771
DOI: https://doi.org/10.1007/s00784-015-1466-8

Keynote webinar | Spotlight on medication adherence

Springer Medicine

Dental discoloration caused by bismuth oxide in MTA in the presence of sodium hypochlorite

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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