Abstract: Objective: To investigate the effect of different maxillary canine root canals on the stress distribution of 3D printing post and core by three-dimensional finite element analysis. Methods: Micro-CT scan, reverse engineering software MIMICS, model reconstructing software MAGICS and Unigraphics (UG) software were employed to reconstruct the three-dimensional finite element models of maxillary canines. Results: For normal root canals, the stress distribution of 3D printing post and core system was better than that of prefabricated fiber post system by reducing the failure probability of bond. For funnel-shape root canals, the stress distribution of 3D printing post and core system was better than that of prefabricated fiber post system by increasing the fracture resistance of teeth. Conclusion: 3D printing posts are better than pre fiber post system to restore the maxillary canine.

Key words: 3D printing, Post and core system, Custom fabrication , Stress analysis