Fracture resistance of endodontically treated teeth and restored with different fiber posts in distinct diameters

Objective: The aim of this in vitro study was to evaluate the fracture resistance endodontically treated teeth restored with different intraradicular posts (carbon fibers, glass, or quartz) varying post diameters (narrow, medium, large). Methodology: One hundred and twenty bovine incisors were space prepared. classified according distinct [Narrow (0.91-1.49mm), Medium (1.5-2.08mm), Large (2.09mm-2.67mm)] randomly allocated four restorative treatments: control (CO) - without post; glass fiber (GF), carbon (CF) quartz (QF) posts. cemented dual-cure resin cement (Duo Link, Bisco, Schaumburg, United States) coronary portion reconstructed composite (Bis-Core, States). Fracture values (N) analyzed by two-way ANOVA Bonferroni test (α=0.05). Results: mechanical behavior similar other evaluated posts, regardless diameter. group (without post) showed highest (1013.8 1127.2 N) relation groups (236.1 615.1 N). Within same material, diameter influenced strength only post, for large. Conclusion: A larger gives greater QF; CF have diameter; large diameter, type used does not differ resistance.