Abstract : This study aimed to evaluate the effect of using dentine posts on the fracture resistance of endodontically treated primary incisors in comparison to glass fiber and composite posts. The study sample consisted of 45 extracted primary maxillary incisors they were randomly distributed into two groups: Group I (Experimental, n=15): which was restored with dentine posts, Group I (Experimental, n=15): which was restored with composite posts, Group III (Control, n=15): which was restored with glass fiber posts. Initially, 10 extracted single-root permanent teeth were collected to prepare twenty dentine posts using a CAD-CAM machine. Then, the primary maxillary incisor crowns were cut, and the canals were prepared and filled. Then the preparation for a post was made using Gates Glidden drills, and the posts were placed with an extension of 3 mm within the canal in both groups, then the crown was built and the teeth were placed within acrylic cubes and subjected to 500 thermocycling. Fracture resistance was recorded using a Testometric machine. Data were analyzed using a One-way ANOVA test. The dentine posts group showed greater fracture resistance (246.3 N) than the glass fiber posts group (206.3 N) with a statistically significant difference (P-value=0.004). The dentine posts group also showed greater fracture resistance than the composite posts group (154.1 N) with a statistically significant difference (P-value=0.000). The fracture resistance of the glass fiber posts group was greater than the composite posts group with a statistically significant difference (P-value=0.000). The dentin posts used in restoring severely decayed primary maxillary incisors showed greater fracture resistance than glass fiber and composite posts. Therefore, the use of dentin posts as intra-canal stabilizers in maxillary primary incisors is a good alternative for glass fiber and composite posts.