Fatigue failure of anterior teeth without ferrule restored with individualized fiber-reinforced post-core foundations

The aim was to explore the survival of extensively damaged anterior teeth without ferrule restored with different fiber-reinforced composite (FRC) post-core foundations and crowns. Sixty extracted upper central incisors were decoronated randomly divided into four groups (n = 15). After endodontic treatment, specimens individualized as follows: control group (CTRL): multiple unidirectional FRC-post + dual-cure composite-core, PFC: packable short (SFRC), BPFC: Bioblock technique only SFRC, BFFC: flowable SFRC. core build-up, finalized adhesively luted CAD/CAM Cyclic isometric loading (5 Hz) applied at 100 N for 5000 cycles, then 200 300 15,000 cycles each in a fluid chamber. loaded until fracture occurred or when total 35,000 reached. Kaplan-Meyer analysis conducted, followed by pairwise log-rank post hoc comparisons (Mantel-Cox). rates (8279 cycles) PFC (6161 significantly higher compared BPFC (3223 BFFC (2271 (p < 0.05). Regarding pattern, nearly all fractured restorable manner. For restoring teeth, FRC posts are recommended. Although post/core systems available restoration root canal treated tend be good option is missing.