Samples were prepared with HyFlex EDM files, in the sequence: orifice opener tip size 25/.12 taper, Glidepath file tip size 10/.05 taper, and preparation file tip size 20/.05 taper.
Postinstrumentation CBCT analysis was done for each sample, and NNT software was used to calculate the thickness of the PCD [Figure 2b] at the CEJ level.[3 (link),4 (link)] After drying canals with paper points, obturation of the root canals was done for all groups except Group A using a single-cone obturation technique with gutta-percha corresponding to the last instrument and AH Plus sealer (Dentsply Maillefer). In Group A, obturation was done by lateral condensation technique. Obturating materials were removed from the pulp chamber, and access cavities were restored with composite. The samples were then subjected to fracture resistance analysis.