Stress Distributions for Hybrid Composite Endodontic Post Designs with and without a Ferrule: FEA Study

Abstract

The aim of the current work was to analyze the influence of the ferrule effect for hybrid composite endodontic post designs consisting of carbon (C) and glass (G) fiber-reinforced polyetherimide (PEI), in upper canine teeth. Starting from theoretical designs of C-G/PEI hybrid composite posts with different Young’s moduli (Post A—57.7 GPa, Post B—31.6 GPa, Post C—graduated from 57.7 to 9.0 GPa in the coronal–apical direction) in endodontically treated anterior teeth, the influence of the ferrule effect was determined through finite element analysis (FEA). On the surface of the crown, a load of 50 N was applied at 45° to the longitudinal axis of the tooth. Maximum principal stresses were evaluated along the C-G/PEI post as well as at the interface between the surrounding tooth structure and the post. Maximum stress values were lower than those obtained for the corresponding models without a ferrule. The presence of a ferrule led to a marked decrease of stress and gradients especially for posts A and B. A less marked effect was globally found for Post C, except in a cervical margin section along a specific direction, where a significant decrease of the stress was probably due to local geometric features, compared to the model without a ferrule. The presence of a ferrule did not generally provide a marked benefit in the case of the graduated Post C, in comparison to other C-G/PEI posts. The outcomes suggest how such a hybrid composite post alone should be sufficient to optimize the stress distribution, dissipating stress from the coronal to the apical end.

Effect of Fiber-Reinforced Composite and Elastic Post on the Fracture Resistance of Premolars with Root Canal Treatment—An In Vitro Pilot Study

“…Some potential limitations of the present research was that is a destructive method and many studies have shown that the use of finite element stress analysis to evaluate stress in endodontically treated teeth is the ideal method for assessing post-core application, compared to several other methods of stress analysis [16,17,[37][38][39]. Nonetheless, further in vitro non-destructive studies should be conducted in conjunction with clinical studies.…”

“…To improve fracture resistance of endodontic teeth, new materials with greater physical properties have been tried [15] and also new techniques. Many kind of investigations were carried out not only depending on destructive test but including virtual and real simulations by means of CAD-FEM analyses [16,17] With the latest advances in adhesive restorations, a concept of minimal intervention in dentistry has been introduced to preserve the dental structure as much as possible [18], enhancing its mechanical properties and its ability to adhere to the tooth [19]. Although composite resins (CR) core, glass fiber reinforced CR, fiber reinforced composite (FRC) posts and elastics FRC posts have been used in clinic, we want to analyze their mechanical behavior because we have not found publications where they compare.…”

External Marginal Gap Variation and Residual Fracture Resistance of Composite and Lithium-Silicate CAD/CAM Overlays after Cyclic Fatigue over Endodontically-Treated Molars

“…To improve mechanical properties of the tooth-restoration complex, fiber posts have been indicated in association with direct restorations as well as during buildup procedures which support indirect adhesive restorations [17,18]. A recent study by Ausiello et al showed, through a FEA analysis, how a hybrid composite post should be sufficient to optimize the stress distribution, dissipating stress from the coronal to the apical end [19]. Kemaloglu et al (2015) showed that a fiber network might change stress dynamics at the interfaces [20] and recent studies suggested that this fact might influence marginal gap progression [21,22].…”

“…Kemaloglu et al (2015) showed that a fiber network might change stress dynamics at the interfaces [20] and recent studies suggested that this fact might influence marginal gap progression [21,22]. Different results concerning their effect on fracture resistance have been reported in literature [23][24][25], and it has been suggested that fiber reinforced materials might lower the number of clinically unrepairable fractures [26] even if ferrule effect must be considered as primary importance [19,27].…”

Mathematical Modelling of Destabilization Stress Factors of Stable-Elastic Fixation of Distal Trans- and Suprasyndesmotic Fibular Fractures

“…The control of the process-structure-property relationship of a material plays an important role in the design of biomedical metal devices featuring desired properties. The studies [ 28 , 29 ] showed the possibility to directly act on the material-shape combination to modulate the mechanical behaviour of devices for different biomedical applications. Reverse engineering and additive manufacturing methods are required to achieve the design of customized devices with specific shape and size [ 30 ].…”