This was further supported by Torabinejad et al.,[12] who concluded that hydration http://www.selleckchem.com/products/Pazopanib-Hydrochloride.html of the powder might have resulted in formation of the colloidal gel that solidified to a hard structure in less than 4 h. Least microleakage was shown by MTA in the present study, which is also in accordance to some other study conducted in Brazil.[15] Light-cured composite resin with a dentin bonding agent The mean microleakage values for composite increased with time period, but this increase in microleakage was found to be non-significant. This potent sealing ability of composite with dentin bonding agent could be because the contraction gaps that formed between the composite resin and the dentin walls during polymerization might have been sealed by a resin impregnation technique.
[16,17] Light-cured glass ionomer cement The mean microleakage values of LC GIC slightly decreased at 96 h and further slightly increased at 1 week interval. The results were found to be non-significant. The high value of dye leakage with LC GIC could be explained by the fact that cement might have well adapted to one cavity wall but the gaps might have been developed on the other cavity wall, resulting in microleakage. Chong et al.[6] confirmed the above fact and suggested that polymerization contraction probably contributed to this phenomenon. Resin-modified zinc oxide eugenol The results of the study indicated an increase in the mean microleakage values at all the time intervals, and this increase was found to be non-significant.
This could be due to the development of larger gaps as a result of marginal deterioration and moisture contamination during the procedure, leading to increased dye leakage. It is also possible that resin-modified zinc oxide eugenol, which is reinforced with polystyrene, might have suffered marginal breakdown GSK-3 resulting in its poorer sealing ability.[18] Positive control possessed maximum microleakage among the experimental materials. A positive control was required so as to ensure that our experiment was showing true results. Roots with no retrograde filling in the retrograde cavities were selected as positive control.[19] The mean microleakage of positive control remained constant at all the time intervals. Negative control roots with no retrograde preparation and with two coats of nail polish all over the tip were selected as negative control to ensure that microleakage around the experimental materials was not just because of errors in retrograde filling. Aqrabawi[19] emphasized the importance of taking a negative control during the dye leakage test.
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