Microleakage of Gutta Percha and Resilon at Different Canal Length

The sealing of root canal filling is proportional to the length of the remaining filling. Reduction of gutta percha filling to 5 mm is considered as a safe margin. Advances in dentin bonding technology have led to the development of new root canal filling, Resilon. Objective: To assess the efficacy of two root canal filling, gutta percha and Resilon, to preserve apical seal after post space preparation. Methods: Twenty four single rooted teeth with 14 mm long were prepared with step back technique using K-flex file and gate glidden drill. Apical enlargement was performed to #60 file while the coronal orifice was controlled to diameter of 2 mm. All roots was assigned randomly to two experimental groups of 12 each. Group I was obturated with Resilon/RealSeal, while the other was obturated with gutta percha/ZOE sealer. After that, the root canal filling in both groups was removed 10 mm and 12 mm. All teeth at each length of root canal filling were subjected to fluid filtration analysis to measure volume of fluid flow rate (nl/sec). Data was analyzed statistically using repeated analysis of variance. Results: After removal of root canal filling, the fluid flow rate increased statistically significant (p<0.05). However, the groups obturated with Resilon/RealSeal showed significantly lower fluid flow rate than the others, irrespective of post space preparation length. Conclusion: Reduction of root canal filling, both Resilon and gutta percha, affect the apical microleakage; however, Resilon seemed to perform better apical seal than gutta percha.