The influence of material and design post on stress distribution

Objective: Analyze the influence of the amount of root dentin and different materials and diameters in post (cast gold core and fiber glass post) in the restored with 2D finite element analysis. Methods: Four virtual bidimensional models with a maxillary central incisor restored with post and core and with all-ceramic crown contacting against a mandibular central incisor were made. A 100 N load was applied into the maxillary incisor by the inferior incisor. The analysis was made considering a strain plain and all the structures were considered as homogeneous, isotropic and with linear elastic behavior as simplifying hypothesis. The data were analyzed with von Mises criteria and with tensile-compressive strain. Results: The most variable data were found in the apical area of the post, differing fiberglass from gold, showing that the fiberglass distribute better the strain along the post while the gold concentrate stress in the end of the post. Conclusion: It was concluded that there was no significant difference regarding stress distribution in the surrounding bone for the models analyzed. However, the groups with the gold core restoration showed higher stress concentration, which may indicate higher predisposition for fractures.