Purpose: The fracture resistance and mode of fracture in maxillary incisors restored with the ultraconservative post (size 0) and conventional fiber posts (sizes 1 and 2) subjected to 45° stress. Materials and methods: A total of 60 extracted human permanent maxillary central incisors were decoronated, instrumented, and obturated using the sectional obturation technique. Six groups (n = 10 samples each) were created—group I (size 0 Hi-Rem post), group II (size 1 Hi-Rem post), group III (size 2 Hi-Rem post), group IV (size 0 EasyPost), group V (size 1 EasyPost), and group VI (size 2 EasyPost). Post space was prepared in each root, preparing posts for cementation and core buildup. The specimens were tested for fracture resistance using a universal testing machine at a 45° angle and 1 mm/minute. The mode of failure was visually determined. The paired t-test was done to analyze the difference in fracture resistance within the groups, and the unpaired t-test was used to compare the groups. Results: The mean fracture resistance of EasyPost and Hi-Rem posts with size 0 was higher (618.30 and 624.40 N, respectively) than sizes 1 (544.80 and 561.20 N, respectively) and 2 (464.40 and 479.70 N, respectively). There were statistically significant mean value differences between the two groups for size 1 post (p = 0.008). In all three sizes, Hi-Rem showed a higher mean fracture resistance value than EasyPost. Conclusion: This study found that ultraconservative posts (size 0) of Hi-Rem and EasyPost had greater fracture resistance than conservative posts (sizes 1 and 2). Furthermore, size 0 Hi-Rem posts performed marginally better than size 0 EasyPost. Favorable fractures are most common with both Hi-Rem and EasyPost.