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.
journal_name
Clin Oral Investigjournal_title
Clinical oral investigationsauthors
Marciano MA,Duarte MA,Camilleri Jdoi
10.1007/s00784-015-1466-8subject
Has Abstractpub_date
2015-12-01 00:00:00pages
2201-9issue
9eissn
1432-6981issn
1436-3771pii
10.1007/s00784-015-1466-8journal_volume
19pub_type
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journal_title：Clinical oral investigations
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