•Purpose: to examine the ultrastructural quality of the apical seal in Resilon filled versus gutta-percha filled root canals that were created with the same compaction technique
•N= 24 single rooted teeth
•Teeth were accessed and prepared using crown down technique (profile #35), irrigated with and EDTA.
•Filled using continuous wave technique with either G1: gutta pertcha/ah plus or G2: resilon/epiphany.
•After obturation of the root canals, access cavities were restored with a total-etch dentin adhesive and hybrid resin composite.
•Teeth were examined for gaps along canal walls using SEM each specimen was sectioned longitudinally to expose the filling- root dentin interface. •Transmission electron microscopy (TEM) used to assess the apical leakage using a using silver tracer penetration protocol. o
Most highlighted Results:
•SEM revealed both gap-free regions, and gap-containing regions in canals filled with both materials.
•After immersion of the filled roots in AgNO3, leakage was observed in 9 of 10 Resilon-filled, and all gutta-percha-filled root canals. The leakages in both groups were confined to the apical 4 mm, and occurred on either one or both sides of the root fillings.
•complete hermetic apical seal cannot be achieved with either materials . Resilon is not superior to GP.