Comparative Evaluation of Stress Distribution on an endodontically treated deciduous maxillary central incisor restored with different post materials under various traumatic loading conditions: 3-D Finite Element Analysis.
Journal Title: International Journal of Dental Science and Innovative Research (IJDSIR) - Year 2019, Vol 2, Issue 2
Abstract
Introduction: Determination of stress distribution in post-core restored endodontically treated teeth is challenging due to the fact that the post and core system, the root and its canal, and the bony structures supporting the root have small dimensions and are structurally complex. Due to this, most biomechanical research has been performed in-vitro and in-vivo, but was unsuccessful to explain the internal behavior of the structures. Finite Element Analysis (FEA) makes it possible to evaluate the stresses and strains in the living structures under various external forces. Aim: To evaluate and compare the influence of stress distribution in deciduous maxillary central incisors restored with various post and core combinations. Materials and Methods: A 3D finite element model of an endodontically treated deciduous maxillary central incisor tooth was generated and geometric models were developed using pro/engineer which were meshed into elements. Vertical, horizontal, and oblique loads of 150 N were applied on the crown to simulate horizontal traumatic impact, ideal primary occlusion and vertical traumatic impact respectively. Von-mises stresses in dentin, posts, cores and crowns were determined using ANSYS Software Results: Horizontal loading condition was found to be the most dangerous, which caused highest stresses in dentin and posts, followed by oblique loading and vertical loading conditions. It had been found that the stress distributions in root dentin were most uniform when the Modulus of elasticity of the posts and cores were similar to that of the dentin. Conclusion: The post with higher elastic modulus caused higher stress concentrations and less uniform stress was distributed in both dentin and the posts with vertical loading. Horizontal loading was more supported by Zirconia post (highest elastic modulus post) thus minimum stress value to the root-dentin were noticed. Oblique loading was well supported by Glass-fiber post, Ribbond post, and even Dentin post. Vertical loading was more supported by Glass-fiber post.
Authors and Affiliations
Dr. Malvika Panchal Sharma
Keywords
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