Apical microfiltration in obtured canals with topseal, previous dental treatment

The purpose of this study was to evaluate the apical microfiltration in canals obtured with Topseal, with or without the use previous EDTA gel 10%, through a method of staining with methylene blue. 42 roots of teeth were instrumented with limes k until number 40 and irrigated with sodium hypochlorite 5%. Then were divided randomly into 4 groups. Group A: 5 roots, negative control, root canal filling with vitremer. Group B: 16 roots treated with EDTA gel 10% for 5 minutes before the shutter with Topseal. Group C: 16 roots not treated with EDTA, before the root canal filling with Topseal. Group D: 5 roots that were implemented without off. All the roots were isolated externally with a double layer of nail polish, leaving only the free 3 mm apical, were then immersed in methylene blue at  2% for 7 days. After this period the roots were cut lengthwise. The microfiltration was measured in each root from the cement layer to limit coronal with a digital calibrator, under a microscope. The data collected were recorded and analyzed using Student Test. We found statistically significant differences between the group with or without treatment with EDTA layer. We conclude that the use of a dentinal treatment with EDTA gel 10% for 5 minutes before the shutter with Topseal significantly increases the apical microfiltration.