Aim: The objective of the study is to evaluate the cervicalapical sealing of bulk-fill flow resins associated with a universal adhesive system, in endodontically treated teeth, considering two methods of evaluation.
Materials and methods: The samples used in the bacterial leakage analysis were autoclaved, filled inside a laminar flow chamber, and divided into four experimental groups (n = 8) according to the restorative material: Filtek Bulk-fill flow; Surefil SDR flow; TetricEvoflow and the positive control. The samples were inoculated with the Enterococcus faecalis (E. faecalis), every 7 days and the microleakage was evaluated on a daily basis for 60 days. Microleakage tested with dye (n = 5) was considered in 2-time intervals of evaluation (24 hours and 72 hours), and the results were obtained in scores from 0-5. Data were submitted to the statistical tests, at a level of significance of 0.05.
Results: About 12.5% of the FBF specimens showed bacterial microleakage as from the thirteenth day, and SDR, from the 20th day. TEF presented the highest percentage of microleakage at 40 days, concluding the 60 days with 37.5% of viable specimens. The Log-rank test revealed that the survival curve of TEF was statistically significant in comparison with those of the other groups. In the test with dye TEF and SDR presented the highest and lowest rate of microleakage, respectively, with statistically significant differences in the time interval of 72h.
Conclusion: The resins FBF, SDR, and TEF were incapable of promoting the hermetic sealing of fillings in the root canal system.
Clinical significance: No bulk-fill flux studied was able to completely eliminate microleakage, despite the best performance with respect to the microleakage time presented by Filtek Bulk fill, followed by Surefil SDR flow.
Keywords: Bacterial microleakage; Bulk-fill; Composites; Dye microleakage.