Microhardness of in vitro caries inhibition zone adjacent to conventional and resin-modified glass ionomer cements

ABSTRACT Aim The purpose of the study is to evaluate the bacterial microleakage of three different materials, mineral trioxide aggregate (MTA), resin-modified glass ionomer cement (RMGIC), and flowable composite, as a coronal barrier against Enterococcus faecalis. Materials and methods A total of 100 human extracted single-rooted teeth were selected. Access opening done, working length determined, and canals were cleaned and shaped with ProTaper F3 and obturated with AH26 and gutta-percha (GP) using lateral condensation technique. Samples were divided into three experimental and two control groups. Approximately 3 mm GP was removed from the coronal orifice and restored with one of the test materials. Teeth were suspended in glass tubes containing brain heart infusion (BHI) broth and equipped with microcaps, which were used to check bacterial leakage. A 24-hour broth of E. faecalis was placed in the pulp chamber. Tubes were incubated and checked for turbidity for 90 days. Data were analyzed using chi-squared test between the test and control groups and Fisher test between the test groups. Results Significantly lesser number of samples turned turbid in the RMGIC group followed by MTA group and the maximum number of samples turned turbid in the flowable composite group. Conclusion The RMGIC is a better coronal sealer, followed by MTA and flowable composite. Clinical significance Coronal sealing ability of RMGIC is more promising in comparison with the other agents. How to cite this article Rashmi N, Shinde SV, Moiz AA, Vyas T, Shaik JA, Guram G. Evaluation of Mineral Trioxide Aggregate, Resin-modified Glass Ionomer Cements, and Composite as a Coronal Barrier: An in vitro Microbiological Study. J Contemp Dent Pract 2018;19(3):292-295.

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Oral Function Improves Interfacial Integrity and Sealing Ability Between Conventional Glass Ionomer Cements and Dentin

Microscopy and Microanalysis ◽

10.1017/s1431927617000010 ◽

2017 ◽

Vol 23 (1) ◽

pp. 131-144 ◽

Cited By ~ 3

Author(s):

Manuel Toledano ◽

Raquel Osorio ◽

Inmaculada Cabello ◽

Estrella Osorio ◽

Manuel Toledano-Osorio ◽

...

Keyword(s):

Confocal Microscopy ◽

Rhodamine B ◽

Adhesive Layer ◽

Glass Ionomer Cements ◽

Glass Ionomer ◽

Absorption Layer ◽

Resin Modified Glass Ionomer ◽

Load Cycling ◽

Dye Sorption

AbstractThe aim of this study was to investigate if load cycling affects interfacial integrity of glass ionomer cements bonded to sound- or caries-affected dentin. A conventional glass ionomer, Ketac Bond, and a resin-modified glass ionomer (Vitrebond Plus), were applied to dentin. Half of the specimens were load cycled. The interfaces were submitted to dye-assisted confocal microscopy evaluation. The unloaded specimens of sound and carious dentin were deficiently hybridized when Ketac Bond was used. Ketac Bond samples showed an absorption layer and an adhesive layer that were scarcely affected by fluorescein penetration (nanoleakage), in sound dentin. Nevertheless, a higher degree of micropermeability was found in carious dentin. In Ketac Bond specimens, load cycling improves the sealing capability and remineralization at the cement–dentin interface as porosity and nanoleakage was reduced. In contrast, samples treated with Vitrebond Plus exhibited a Rhodamine B-labeled absorption layer with scarce nanoleakage in both sound and carious unloaded dentin. The adhesive layer was affected by dye sorption throughout the porous cement–dentin interface. Samples treated with Vitrebond Plus had significant increases in nanoleakage and cement–dye sorption after load cycling. Within the limitations of an in vitro study, it is expected that conventional glass ionomers will provide major clinical efficacy when applied to carious-affected or sound dentin.

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