Fracture resistance of simulated immature maxillary anterior teeth restored with various canal filling materials, with micro-posts or with a fiber post.

The aim of this in vitro study was to compare the fracture resistance of immature anterior teeth restored with different biomaterials. After preparation of bovine incisors to simulate immature permanent teeth, 98 specimens were assigned into seven groups as follows: G1 -negative control group; G2 -apexification with hydraulic calcium silicate cement in the whole root; G3 -apexification and gutta percha; G4 -apexification and fiber post; G5 -apexification with micro-posts; G6 -apexification with composite; and G7 -revascularization. Both the fracture resistance and the location where the fracture occurred were recorded. Group 4 with a fiber post increased fracture resistance value compared to control (p<0.05). The different tested biomaterials did not influence the location where the fractures occurred among the seven groups (χ21=1.760, p=0.1846).