Evaluation of microleakage across different post-core systems in the endodontic-periodontal interface

The effect of different post and core systems on microleakage at the endodontic-periodontal interface (EPI) remains unclear, despite its potential impact on secondary endodontic and periodontal complications. Hence, 90 extracted human single-rooted premolars were randomly assigned to three groups (n=30): Group FRC (FRC post + composite core), Group CG (Cast gold post-core) and Group TI (Titanium post + composite core). Following standardized endodontic treatment, post spaces were prepared and posts were cemented using dual-cure resin cement. Cores were built accordingly. Teeth were subjected to thermocycling (10,000 cycles, 5°C-55°C) and cyclic loading (100,000 cycles, 50N). Microleakage at the EPI was assessed using a fluid filtration method under constant pressure (20 kPa) for 10 minutes, quantifying the fluid volume (µL) traversing the interface. Within the limitations of this in vitro study, prefabricated FRC posts combined with composite cores demonstrated superior sealing ability at the EPI compared to cast gold and prefabricated titanium post systems under simulated functional conditions. This suggests FRC systems may offer a clinical advantage in minimizing microleakage and potentially reducing the risk of secondary endodontic or periodontal complications.