Stress analysis of an upper central incisor restored with different posts

Abstract

The effect of different anatomic shapes and materials of posts in the stress distribution on an endodontically treated incisor was evaluated in this work. This study compared three post shapes (tapered, cylindrical and two-stage cylindrical) made of three different materials (stainless steel, titanium and carbon fibre on Bisphenol A-Glycidyl Methacrylate (Bis-GMA) matrix). Two-dimensional stress analysis was performed using the Finite Element Method. A static load of 100N was applied at 45 degrees inclination with respect to the incisor's edge. The stress concentrations did not significantly affect the region adjacent to the alveolar bone crest at the palatine portion of the tooth, regardless of the post shape or material. However, stress concentrations on the post/dentin interface on the palatine side of the tooth root presented significant variations for different post shapes and materials. Post shapes had relatively small impact on the stress concentrations while post materials introduced higher variations on them. Stainless steel posts presented the highest level of stress concentration, followed by titanium and carbon/Bis-GMA posts.

Fracture resistance of teeth with oval canal morphology restored using oval and circular posts

“…This may be due to stress concentration in similar root dentin areas even when different post shapes were used. It was previously reported that variations in the shape of the post did not affect stress distribution in the root dentin (32)(33)(34).…”

Non-linear Viscoelastic Finite Element Analysis of the Effect of the Length of Glass Fiber Posts on the Biomechanical Behaviour of Directly Restored Incisors and Surrounding Alveolar Bone

“…If correctly validated, the FEA could be useful in optimizing restorative design criteria and material choice and in predicting potential fracture under given circumstances 11) . Most of the FEA studies on the strain and stress distribution in post and crown-restored teeth are based on two-dimensional (2D) models [23][24][25] , with only a few on three-dimensional (3D) ones 8,11,17,26) . Although reliable when considering axial symmetric systems, 2D meshing procedures do not allow correct assessment of the spatial distribution of stresses and strains affecting a restorative system.…”

Effect of post type on the fracture resistance of endodontically treated premolars

“…Thus, by lowering the stress that occurs during mastication, the risk of root fracture should be reduced. De Castro et al examined the influence of the post material (stainless steel, titanium or carbon/Bis-GMA posts) and post configuration on the stress distribution in ETT [16]. The results showed that the shape of the post had a relatively small effect on stress concentration.…”