scholarly journals Effect of restoration technique on stress distribution in extensively destroyed premolars: a finite element analysis study

2017 ◽  
Vol 65 (1) ◽  
pp. 20-24
Author(s):  
Wagner Araújo de NEGREIROS ◽  
Rômulo Rocha REGIS ◽  
Karina Matthes de Freitas PONTES ◽  
Antônio Materson da SILVA ◽  
Francisco Ilson da SILVA JUNIOR
Keyword(s):  
Finite Element ◽  
Stress Distribution ◽  
Glass Fiber ◽  
Composite Resin ◽  
Laboratory Simulation ◽  
Fiber Post ◽  
Restoration Technique ◽  
Resin Core ◽  
Glass Fiber Post ◽  
Ceramic Crown

ABSTRACT Objective: The objective of this study by the finite element method was to analyze the stress distribution on a single-rooted mandibular premolar tooth restored in two different ways. Methods: Laboratory simulation considered the following situations: 1) premolar restored with gold cast post and ceramic crown; 2) premolar restored with glass fiber post, composite resin core and ceramic crown. For this we used a two-dimensional model of a premolar with load application of 300N in the axial and oblique directions within the ANSYS program for Windows. Results: Under the axial load, a higher concentration of stresses was observed around the cast post (166 MPa). In the oblique load simulation, there was a concentration of stresses on the buccal root wall, internally and externally, in the tooth restored with cast post (222 MPa). In both load directions, the glass fiber post dissipated the stress received with greater uniformity (55 to 111 MPa). Conclusion: These data suggested that from the biomechanical point of view, the use of a glass fiber post and composite resin core could be more advantageous than the cast post technique for a mandibular single-rooted premolar tooth.

scholarly journals Evaluation of Different Restoration Combinations Used in the Reattachment of Fractured Teeth: A Finite Element Analysis

2018 ◽  
Vol 2018 ◽  
pp. 1-8
Author(s):  
Nagihan Guven ◽  
Ozgur Topuz ◽  
İhsan Yikilgan
Keyword(s):  
Finite Element Analysis ◽  
Glass Fiber ◽  
Composite Resin ◽  
Fracture Line ◽  
Core Material ◽  
Fiber Post ◽  
Stress Concentrations ◽  
Element Analysis ◽  
Composite Resin Restoration ◽  
Glass Fiber Post

Objective. The purpose of this study was to test different restoration combinations used for constructing fractured endodontically treated incisors by reattaching their fractured fragments. Methods. Seven types of 3-D FEM mathematical root canal-filled models were generated, simulating cases of (OB) reattaching fractured fragments; (CrPL) reattaching fractured fragments + ceramic palatinal laminate; (CmPL) reattaching fractured fragments + composite palatinal laminate; (CM) reattaching fractured fragments + coronal 1/3 of the root was filled using core material; (BP) reattaching fractured fragments + glass fiber post; (CP) composite resin restoration + glass fiber post; and (OC) composite resin restoration. A 100-N static oblique force was applied to the simulated teeth with 135° on the node at 2 mm above the cingulum to analyze the stress distribution at the tooth. Results. For enamel tissue, the highest stress values were observed in model BP, and the lowest stress values were observed in model CmPL. For dentine tissue, the highest stress concentrations were observed around the fracture line for all models. Conclusions. Reattachment of fractured fragments by bonding may be preferred as a restoration option for endodontically treated incisors; also, palatinal laminate decreases the stress values at tooth tissues, especially at the enamel and the fracture line.

scholarly journals Stress Distribution in Roots Restored with Fiber Posts and An Experimental Dentin Post: 3D-FEA

2016 ◽  
Vol 27 (2) ◽  
pp. 223-227 ◽  
Author(s):  
Hugo Henrique Diana ◽  
Juliana Santos Oliveira ◽  
Mariana Carolina de Lara Ferro ◽  
Yara T. Corrêa Silva-Sousa ◽  
Érica Alves Gomes
Keyword(s):  
Carbon Fiber ◽  
Stress Distribution ◽  
Glass Fiber ◽  
Von Mises Stress ◽  
Fiber Post ◽  
Maxillary Canine ◽  
Element Analysis ◽  
3D Fea ◽  
Glass Fiber Post ◽  
Von Mises

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.

scholarly journals Influence of diameter and intraradicular post in the stress distribution. Finite element analysis

2016 ◽  
Vol 45 (3) ◽  
pp. 171-176 ◽  
Author(s):  
Cleidiel Aparecido Araujo LEMOS ◽  
Daniel Augusto de Faria ALMEIDA ◽  
Victor Eduardo de Souza BATISTA ◽  
Carol Cantieri MELLO ◽  
Fellippo Ramos VERRI ◽  
...  
Keyword(s):  
Finite Element ◽  
Carbon Fiber ◽  
Glass Fiber ◽  
Fiber Post ◽  
Endodontically Treated Teeth ◽  
Cast Metal ◽  
Biomechanical Behavior ◽  
Glass Fiber Post ◽  
Oblique Load ◽  
Metal Post

Abstract Introduction The biomechanical behavior of endodontically treated teeth depending on the selected restorative material and tooth situation to be restored. Objective To analyze by the two-dimensional finite element method the biomechanical behavior of different diameters in intraradicular posts and teeth with coronal remaining of 2mm. Material and method Six models were made with three types of posts, as follows: Glass fiber post, carbon fiber post, and cast metal post, both with diameter # 1 (1.1 mm in diameter) and # 2 (1.3 mm of diameter). The modeling was performed using the Rhinoceros 4.0 program. The FEMAP 10.2 and NEiNastran 9.2 programs were used to develop finite element models. The loading used was 100N for axial and oblique forces. The results were visualized using the von Mises stress map. The statistical analysis was made using analysis of variance (ANOVA) and Tukey post-test, with a significance level of 5%. Result The oblique loading stress values were higher than the axial loading (p<0.001) for both situations. The glass fiber post showed the lowest concentrations of stress on both loads (p<0.001). The carbon fiber post presented significant difference compared to the cast metal post, only in the oblique load (p=0.007). The diameter did not increase the stress of the evaluated posts (p=0.302). Conclusion The fiber posts were more favorable for restoration of endodontically treated teeth; the increase of diameter did not influence the increase of tension; the oblique load was more harmful for both posts and tooth structure.

scholarly journals Stress Concentration of Endodontically Treated Molars Restored with Transfixed Glass Fiber Post: 3D-Finite Element Analysis

Materials ◽  
2021 ◽  
Vol 14 (15) ◽  
pp. 4249
Author(s):  
Alexandre Luiz Souto Borges ◽  
Manassés Tercio Vieira Grangeiro ◽  
Guilherme Schmitt de Andrade ◽  
Renata Marques de Melo ◽  
Kusai Baroudi ◽  
...  
Keyword(s):  
Finite Element ◽  
Glass Fiber ◽  
Resin Composite ◽  
Class Ii ◽  
Axial Loads ◽  
Fiber Post ◽  
Fiber Posts ◽  
Glass Fiber Posts ◽  
Glass Fiber Post ◽  
Vertical Glass

The loss of dental structure caused by endodontic treatment is responsible for a decrease in tooth resistance, which increases susceptibility to fracture. Therefore, it is important that minimally invasive treatments be performed to preserve the dental structure and increase the resistance to fracture of endodontically treated posterior teeth. To evaluate under axial loads, using the finite element method, the stress distribution in endodontically treated molars restored with both transfixed or vertical glass fiber posts (GFP) and resin composite. An endodontically treated molar 3D-model was analyzed using finite element analyses under four different conditions, class II resin composite (G1, control model), vertical glass fiber post (G2), transfixed glass fiber posts (G3) and vertical and transfixed glass fiber posts (G4). Ideal contacts were considered between restoration/resin composite and resin composite/tooth. An axial load (300 N) was applied to the occlusal surface. The resulting tensile stresses were calculated for the enamel and dentin tissue from five different viewports (occlusal, buccal, palatal, mesial and distal views). According to the stress maps, similar stress trends were observed, regardless of the glass fiber post treatment. In addition, for the G1 model (without GFP), a high-stress magnitude can be noticed in the proximal faces of enamel (7.7 to 14 MPa) and dentin (2.1 to 3.3 MPa) tissue. The use of transfixed glass fiber post is not indicated to reduce the stresses, under axial loads, in both enamel and dentin tissue in endodontically treated molar with a class II cavity.

Effect of silane-containing universal adhesive on push-out bond strength of glass fiber post to composite resin and to resin cement/intraradicular dentin

2018 ◽  
Vol 84 ◽  
pp. 126-131
Author(s):  
Enaldo Marques França e Silva ◽  
Roberta Tarkany Basting ◽  
Cecilia Pedroso Turssi ◽  
Fabiana Mantovani Gomes França ◽  
Flávia Lucisano Botelho Amaral
Keyword(s):  
Bond Strength ◽  
Glass Fiber ◽  
Composite Resin ◽  
Resin Cement ◽  
Fiber Post ◽  
Universal Adhesive ◽  
Glass Fiber Post ◽  
Push Out

Effects of Alveolar Bone Loss and Post-Core Design on Stress Distribution of Severely Damaged Canine

2012 ◽  
Vol 512-515 ◽  
pp. 1770-1774
Author(s):  
Ya Gao ◽  
Long Quan Shao ◽  
Bang Lian Deng ◽  
Shan Yu Zhou ◽  
Yuan Fu Yi ◽  
...  
Keyword(s):  
Finite Element ◽  
Stainless Steel ◽  
Stress Distribution ◽  
Bone Loss ◽  
Alveolar Bone ◽  
Alveolar Bone Loss ◽  
Fiber Post ◽  
Computer Aided ◽  
Glass Fiber Post ◽  
Cast Stainless Steel

To investigate the influence of alveolar bone loss and post design on stress distribution of a severely damaged canine. The residual canal dentin wall in the cervical region was standardized at 0.5mm in thickness. Twelve two-dimensional finite element models were created. The models were varied in their alveolar bone loss. The post systems include computer-aided design/computer-aided manufacturing zirconium post, prefabricated glass fiber post, cast stainless steel post, and cast gold post. The numerical models were considered to be restored with an all-ceramic crown. A load of 100N was applied to the crown at an angle of 45 degree on the lingual surface, and Mises stresses were calculated. Finite element analysis revealed that cast stainless steel post system showed the lowest maximum Mises stress in the dentine at 86.46 MPa, while, glass fiber post resulted in the highest stress concentration in the dentin at 174.3 MPa. Stresses were reduced by increasing alveolar height. Loss of alveolar bone loss may lead to an increased risk of failure.

scholarly journals Effect of glass-fiber post on the biomechanical behavior of teeth with direct veneers

2020 ◽  
Vol 23 (3) ◽  
Author(s):  
Ana Luiza Barbosa Jurema ◽  
Marcela Moreira Penteado ◽  
João Paulo Mendes Tribst ◽  
Taciana Marco Ferraz Caneppele ◽  
Alexandre Luiz Souto Borges
Keyword(s):  
Stress Distribution ◽  
Glass Fiber ◽  
Fiber Post ◽  
Principal Stresses ◽  
Finite Elements Analysis ◽  
Endodontically Treated Teeth ◽  
Element Analysis ◽  
Biomechanical Behavior ◽  
Post And Core Technique ◽  
Glass Fiber Post

Objective: This study aimed to evaluate the biomechanical behaviour of endodontically treated teeth with direct veneer that received or not intra-radicular glass fiber post by finite elements analysis. Material and methods: Six models were designed, varying the presence or absence of glass fiber post and the thickness of direct veneer (0.5, 0.7 and 1 mm). Tridimensional models of maxillary central incisors were obtained with CAD software, Rhinoceros 4.0, and transferred to CAE software, ANSYS 17.2, which a 100N load was applied in a 45° on the lingual surface to simulate functional movements. Geometry contacts were bonded, and the structures were isotropic, linear, elastics, and homogeneous. After coherence and convergence analysis of mashes, the chosen fail criterion was the maximum principal stresses. Results: For cement, glass fiber post, the stress distribution was similar independently of glass fiber post presence or veneer thickness. Models with glass fiber post had better stress distribution and lower values of maximum stress for inner dentin and veneers. Veneers with 0.5 and 1 mm had higher stress concentration areas. Conclusions: It can be concluded that glass fiber post is favorable for restored teeth with direct veneers, and very thin or very thick preparations can damage the biomechanical behavior of restorations.KeywordsDental veneers; Finite element analysis; Nonvital tooth; Post and core technique.

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