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Microleakage comparison of glass-ionomer and white mineral trioxide aggregate used as a coronal barrier in nonvital bleaching

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Microleakage comparison of glass-ionomer and white mineral trioxide aggregate used as a coronal barrier in nonvital bleaching

dc.contributor.author	Vosoughhosseini, Sepideh	es
dc.contributor.author	Lotfi, Mehrdad	es
dc.contributor.author	Shahmoradi, Kaveh	es
dc.contributor.author	Saghiri, Mohammad-Ali	es
dc.contributor.author	Zand, Vahid	es
dc.contributor.author	Mehdipour, Masoumeh	es
dc.contributor.author	Ranjkesh, Bahram	es
dc.contributor.author	Mokhtari, Hadi	es
dc.contributor.author	Salemmilani, Amin	es
dc.contributor.author	Doosti, Sirvan	es
dc.date.accessioned	2017-07-26T08:27:10Z
dc.date.available	2017-07-26T08:27:10Z
dc.date.issued	2011	es
dc.identifier.citation	Vosoughhosseini, Sepideh ; Lotfi, Mehrdad ; Shahmoradi, Kaveh ; Saghiri, Mohammad-Ali ; Zand, Vahid ; Mehdipour, Masoumeh ; Ranjkesh, Bahram ; Mokhtari, Hadi ; Salemmilani, Amin ; Doosti, Sirvan. Microleakage comparison of glass-ionomer and white mineral trioxide aggregate used as a coronal barrier in nonvital bleaching. En: Medicina oral, patología oral y cirugía bucal. Ed. inglesa, 16 7 2011: 27-	es
dc.identifier.uri	http://hdl.handle.net/10550/60052
dc.description.abstract	Objectives: There is some evidence that the pH at the root surface is reduced by intracoronal placement of bleaching pastes, which is known to enhance osteoclastic activity. Therefore, it is recommended that a protective barrier be used over the canal filling to prevent leakage of bleaching agents. Glass-ionomer (GI) is commonly used as a coronal barrier before nonvital bleaching. Because mineral trioxide aggregate (MTA) creates high alkalinity after mixing with water, using MTA as a protective barrier over the canal filling may not only prevent leakage of bleaching agents and microorganisms, but may prevent cervical resorption. The aim of this study was to evaluate sealing ability of white mineral trioxide aggregate (WMTA) as a coronal barrier before nonvital bleaching. Study design: Root canals of one hundred thirty human maxillary incisors were instrumented and filled with gutta-percha without sealer. Gutta-percha was removed up to 3 mm below the cementoenamel junction (CEJ). The teeth were randomly divided into six experimental groups of 20 teeth each and two control groups of 5. In three experimental groups, WMTA was packed into the canal to the level of CEJ. In the remaining experimental groups, glass-ionomer (GI) was used as a coronal barrier. After a 24-hour incubation period, one of the following three bleaching agents was placed in the access cavity of each of the WMTA or GI groups. These three bleaching agents were 30% hydrogen peroxide, sodium perborate mixed with 30% hydrogen peroxide, and sodium perborate mixed with distilled water. The bleaching agents were replaced every 3 days for three times. In the positive controls, no coronal barrier was used. In the negative controls, all the tooth surfaces were covered by two layers of nail varnish. Microleakage was evaluated using protein leakage test. Statistical analyses were performed with the Kruskal-Wallis and Mann-Whitney tests. Results: The experimental groups showed minimum leakage which was not significantly more than tha in the negative controls. There was no statistically significant difference in leakage between the experimental groups (p<0.05). Conclusions: This study indicated that different bleaching agents have no effect on sealing ability of WMTA. © Medicina Oral S. L.	es
dc.title	Microleakage comparison of glass-ionomer and white mineral trioxide aggregate used as a coronal barrier in nonvital bleaching	es
dc.type	journal article	es_ES
dc.subject.unesco	UNESCO::CIENCIAS MÉDICAS	es
dc.identifier.doi	10.4317/medoral.17306	es
dc.type.hasVersion	VoR	es_ES