Abstract
The aim of this study was to compare the stress distribution in radicular dentin of a maxillary canine restored with either a glass fiber post, carbon fiber post or an experimental dentin post using finite element analysis (3D-FEA). Three 3D virtual models of a maxillary canine restored with a metal-ceramic crown and glass fiber post (GFP), carbon fiber post (CFP), and experimental dentin post (DP) were obtained based on micro-CT images. A total of 180 N was applied on the lingual surface of the incisal third of each tooth at 45 degrees. The models were supported by the periodontal ligament fixed in three axes (x=y=z=0). The von Mises stress (VMS) of radicular dentin and the intracanal posts was calculated. The structures of all groups showed similar values (MPa) and distribution of maximum von Mises stress. Higher stress was found in the apical third of dentin while the posts presented homogeneous stress distribution along the axis. The fiber and dentin posts exhibited similar stress values and distribution. Thus, the experimental dentin post is a promising restorative material.
Highlights
Treated teeth are more prone to root fragility, fractures and exodontia as a consequence of tooth destruction and collagen alteration [1]
Glass and carbon fiber posts have been widely used for oral rehabilitation [1,2,4]
Higher stresses were found in the apical third; but it was distributed along the proximal surfaces in all groups
Summary
Treated teeth are more prone to root fragility, fractures and exodontia as a consequence of tooth destruction and collagen alteration [1]. Studies have been performed to develop a restorative material with physical and mechanical properties similar to dentin for rehabilitation of endodontically treated teeth [2]. Prefabricated fiber posts embedded in a resin matrix have been suggested as a promising restorative material that presents appropriate esthetics and biocompatibility. These posts are easy to use and show an elastic modulus similar to human dentin, which favors stress distribution along the root axis [3]. A failure rate of up to 7% is still reported for treatments with these intracanal retainers [5]
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