Abstract
AIM: This study aims to evaluate and compare the fracture resistance and mode of failure of endodontically treated teeth restored with new esthetic post and core systems with different lengths of remaining gutta-percha. MATERIALS AND METHODS: Ninety-one extracted human mandibular premolars were used in this study. Following endodontic treatment, the samples were divided into four groups: A positive control group (n = 13) and three experimental groups (Glass Fiber Post, Quartz Fiber Post, and Dentapreg Pin Post) (n = 26 each). Each experimental group was further subdivided into two subgroups based on the length of remaining gutta-percha (4 mm or 6 mm). The samples then underwent post-space preparation, post-cementation, and core build-up, followed by fracture resistance testing under a universal testing machine and evaluation of the mode of failure using radiovisiography. RESULTS: Data were statistically analyzed through SPSS at a confidence interval of 95%. Significant differences were found among groups (P < 0.001). Glass Fiber Post with 4 mm gutta-percha showed the highest fracture resistance (240.04 ± 12.07 N), while the control group had the lowest (50.79 ± 7.67 N). The mode of failure among Dentapreg and glass fiber posts was partial core debonding, but quartz fiber posts showed a mixed mode of failure (partial and complete core debonding and root fracture). CONCLUSION: Glass fiber posts outperformed quartz fiber and Dentapreg pin posts at 4 mm gutta-percha, but showed nonsignificant differences with Dentapreg posts at 6 mm gutta-percha.