Background: To study and compare resilon and gutta-percha filling materials on root canal fracture resistance and restoring with quartz fibre posts. Materials & Methods: A total of 20 root canals of maxillary incisors underwent chemo-mechanical preparation before being divided into two distinct groups. Statistical analysis of the collected data was performed using the T-test. The results were analysed using SPSS Software. Results: The average compressive strength in the experimental Resilon group was 633.76 N, whereas in the control group with gutta-percha, it was 505.26 N. Conclusion: Root canals that were filled with Resilon demonstrated a notably higher level of resistance compared to those filled with gutta-percha, particularly after the application of quartz fiber posts for restoration.