%0 Journal Article %A Zare Jahromi, Maryam %A Barekatain, Mehrdad %A Bonakdar Hashemi, Niloufar %A Refaei, Poorandokht %T Assessment of micro-leakage for light-cure glass ionomer and pro-root mineral trioxide aggregate as coronal barriers in intracoronal bleaching of endodontically treated teeth %J Caspian Journal Of Dental Research %V 6 %N 1 %U http://cjdr.ir/article-1-211-en.html %R 10.22088/cjdr.6.1.22 %D 2017 %K Dental leakage, Glass ionomer cements, Tooth bleaching, %X Introduction: Cervical root resorption is one of the most important complications of intra coronal bleaching. A way of preventing this type of resorption is using a coronal barrier under the bleaching materials. The aim of this study was to compare the sealing ability of glass ionomer cement and Pro Root Mineral Trioxide Aggregate (MTA) as a coronal barrier in intra coronal bleaching. Materials &Methods: In this study, 40 single-root maxillary anterior teeth were endodontically prepared and divided into two experimental groups (n= 15) and two positive and negative control groups (n=5). In the experimental groups, gutta percha was removed up to 3 mm below the cemento enamel junction (CEJ).RMGI and MTA were placed over gutta percha up to the level of CEJ. After a 24-hour incubation period, the bleaching agent (a mixture of sodium perborate and 30% hydrogen peroxide) was placed in the access cavities. The bleaching agents were replaced every 3 days over 9 days. Then, the access cavity was filled with 2% methylene blue for 48 hours. All samples were longitudinally sectioned and the dye penetration range was evaluated using a stereomicroscope. Data were statistically analyzed using Kruskal-Wallis and Mann–Whitney tests (α=0.05). Results: Leakage mean indicated that there was a significant difference between these two groups and leakage was less in ProRoot than glass ionomer. Conclusion: It seems that the MTA can provide a better coronal seal during the bleaching. %> http://cjdr.ir/article-1-211-en.pdf %P 22-28 %& 22 %! Coronal micro-leakage of two different dental material %9 Research Paper %L A-10-278-1 %+ ,Department of Endodontics, Islamic Azad University Isfahan (Khorasgan) Branch, Isfahan, Iran. %G eng %@ 2251-9890 %[ 2017