Evaluating the impact of varying post angulations on the fracture resistance of maxillary incisors restored with polyethylene fiber posts.

Background/purpose: Restoring anterior teeth requiring angulation correction remains clinically challenging. Polyethylene fiber posts have been introduced, offering superior adaptability within the root canal and improved aesthetics. However, the effect of varying degrees of post angulation on the fracture resistance of restored teeth has not been thoroughly investigated. This study aimed to evaluate the fracture resistance of maxillary incisors restored using polyethylene fiber posts at varying angulations. Materials and methods: Thirty-two extracted incisors were selected according to the study criteria. Root canal treatment and gutta-percha removal were performed to prepare for polyethylene fiber posts. All study samples were subsequently divided into four groups of angulations: P1 (5°), P2 (10°), P3 (15°), and a control group (0°). Fracture resistance was tested, and the data were analyzed using one-way ANOVA followed by Post-Hoc comparison with the least significant difference (LSD) statistical tests. Results: A statistically significant difference in fracture resistance was observed among the groups, with group P1 demonstrating the highest fracture resistance (281.29 ± 84.97 N) and the control group exhibiting the lowest (164.75 ± 41.75 N). Conclusion: There was a difference in the fracture resistance of the maxillary incisors when using polyethylene fiber posts at angulation degrees of 5° and 0°, and angulation degrees of 5° and 15°. Therefore, anterior tooth restoration with angulation correction of 5°-10° can utilize polyethylene fiber posts.