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 Analysis of endodontic success using a Periapical Index in teeth with different types of intraradicular posts

2021 ◽  
Vol 10 (8) ◽  
pp. e15110816932
Author(s):  
Otavio da Silva Sposito ◽  
Tatiana Pereira-Cenci ◽  
Noéli Boscato ◽  
Rogério de Castilho Jacinto
Keyword(s):  
Glass Fiber ◽  
Endodontic Treatment ◽  
Fiber Post ◽  
Significance Level ◽  
Cast Metal ◽  
Kaplan Meier ◽  
Glass Fiber Post ◽  
First Time ◽  
Metal Post

This randomized clinical trial evaluated the influence of the type of intraradicular posts (glass fiber post or cast metal post) in the success of endodontic treatment in teeth that received single metal-ceramic restoration. The sample consisted of adult patients, who presented for the first time seeking routine dental care at the dental school over a period of 5 years. Seventy-six out of ninety-six teeth that received endodontic treatment and intraradicular post were analyzed, randomly distributed in two groups – glass fiber post (n=38), and cast metal post (n=38). The quality of the endodontic treatment was radiographically evaluated, and the apical status was assessed using the periapical index (PAI). Statistical Analyses were performed to a significance level of 5%. Descriptive analyses were used to characterize the teeth and survival curves were created using the Kaplan–Meier method. The success rate of endodontic treatment was 90.8% (n=69) including glass fiber post and cast post. When appropriate endodontic treatment was performed is possible to conclude that the success of endodontic treated teeth that received posts was not related to the post type.

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.

scholarly journals Evaluation of the fracture resistance of remaining thin-walled roots restored with different post systems

2013 ◽  
Vol 1 (3) ◽  
pp. 184
Author(s):  
Luis Gustavo Nunes Dias Pinho ◽  
Gustavo Helder Vinholi ◽  
Tulio Kalife Coelho ◽  
Dimas João Rodrigues Neto ◽  
Daiane Cerutti Kopplin ◽  
...  
Keyword(s):  
Glass Fiber ◽  
Fracture Strength ◽  
Composite Resin ◽  
Compressive Loading ◽  
Test Machine ◽  
Fiber Post ◽  
Cast Metal ◽  
Glass Fiber Post ◽  
Post And Core ◽  
Metal Post

The purpose of this work was evaluating the fracture strength of bovine roots weakened experimentally, restored with two different techniques: internal reinforcement of root canal walls with composite resin and a cast metal post and core or anatomic post (glass fiber post associated with composite resin). Thirty bovine lower central incisive were selected and transversally sectioned, remaining 14 mm of root in order to approximate to the human maxillary central incisive.  A sequence of standardized wear was used to weak the root until the walls remaining achieved from 0.5 to 0.7 mm of thickness at the cervical edge. Two groups were separated randomly (n=15) in order to test the roots reinforced with composite resin associated with cast metal post and core (CMP), or roots restored with composite resin associated to the glass fiber post (GFP). The test were applied in a Universal Test Machine (EMIC) with tangential compressive loading focused on the lingual face of core in an angle of 135° with the long axis of the tooth at a crosshead speed of 0.5 mm/min until failure occurred. The results showed that the fracture strength of remaining roots with weakened walls was influenced by the restorative technique, and the higher values of strength fractures were observed in the group of roots reinforced by composite resin associated with CMP (p<0.001) when compared to the group of roots restored with anatomic post.

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.

Comparison of Different Post Systems for Fracture Resistance: An in vitro Study

2017 ◽  
Vol 18 (3) ◽  
pp. 205-208 ◽  
Author(s):  
Suneel V Vadavadagi ◽  
Kiran M Dhananjaya ◽  
Rashmi P Yadahalli ◽  
M Lahari ◽  
Shilpa R Shetty ◽  
...  
Keyword(s):  
Compressive Strength ◽  
Carbon Fiber ◽  
Glass Fiber ◽  
Fracture Resistance ◽  
Quartz Fiber ◽  
Fiber Post ◽  
Tooth Structure ◽  
Fiber Posts ◽  
Glass Fiber Post

ABSTRACT Introduction Endodontic restoration becomes a challenging task for the clinician because of severe loss of coronal tooth structure owing to trauma, caries, restorative, and endodontic procedures. The restoration of these teeth requires the use of a post and core as individual units or as abutment supports for fixed or removable restorations in a predictable long-term manner. Aim To compare and assess the compressive bond strength of glass, quartz, and carbon fiber posts restored with porcelainfused- to-metal (PFM) crown. Materials and methods A total of 45 upper central incisor teeth having straight root canals, similar anatomically root segments, and fully developed apices were selected. Teeth were divided into three groups of 15 teeth after endodontic treatment. Group I: Teeth inserted with the prefabricated glass fiber post. Group II: Teeth inserted with the quartz fiber post. Group III: Teeth inserted with carbon fiber post. The posts were placed and core was fabricated using composite restoration followed by PFM crown cementation using adhesive resin. Compressive load required to fracture the tooth was measured using a universal loading machine. The difference between the variables was assessed by one-way analysis of variance, followed by Tukey's post hoc test. Results The compressive strength exhibited by carbon fiber posts was highest with a mean of 668.33 ± 26.397, followed by quartz fiber post (635.80 ± 30.390). Least compressive strength was exhibited by glass fiber post (567.53 ± 26.632). An analysis of variance shows statistically highly significant difference (p < 0.005) among the posts used. Conclusion This study concluded that the carbon fiber posts had higher compressive strength than other quartz, glass fiber posts. Clinical significance Endodontic treatment results in loss of a significant part of the tooth structure. Posts restore these teeth and provide retention. How to cite this article Vadavadagi SV, Dhananjaya KM, Yadahalli RP, Lahari M, Shetty SR, Bhavana BL. Comparison of Different Post Systems for Fracture Resistance: An in vitro Study. J Contemp Dent Pract 2017;18(3):205-208.

scholarly journals Stress Generated by Customized Glass Fiber Posts and Other Types by Photoelastic Analysis

2015 ◽  
Vol 26 (3) ◽  
pp. 222-227 ◽  
Author(s):  
Kátia Bosso ◽  
Alcides Gonini Júnior ◽  
Ricardo Danil Guiraldo ◽  
Sandrine Bittencourt Berger ◽  
Murilo Baena Lopes
Keyword(s):  
Glass Fiber ◽  
High Stress ◽  
Resin Cement ◽  
Fiber Post ◽  
Tooth Structure ◽  
Biomechanical Behavior ◽  
Fiber Posts ◽  
Glass Fiber Posts ◽  
Glass Fiber Post ◽  
Post And Core

Endodontic posts are necessary to provide adequate retention and support when no sufficient remaining structure is available to retain the core. There are different materials and techniques to construct post-and-core, but there is no consensus about which one promotes better stress distribution on the remaining tooth structure. This study aimed to quantify and evaluate the distribution of stress in the root produced by customized glass fiber posts compared to different endodontic posts. Twenty-five simulated roots from photoelastic resin were made and divided into 5 groups: CPC, cast post-and-core; SP, screw post; CF, carbon fiber post; GF, glass fiber post; and CGF, customized glass fiber post. After cementing CPC and SP posts with zinc phosphate cement, and CF, GF and CGF posts with resin cement, resin cores were made for groups 2-5. Specimens were evaluated with vertical or 45° oblique loading. To analyze the fringes, the root was divided into 6 parts: palatal cervical, palatal middle, palatal apical, vestibular cervical, vestibular middle, and vestibular apical. The formed fringes were photographed and quantified. Data were recorded and subjected to two-way ANOVA and Tukey's test (5%). SP (1.95±0.60) showed higher stress (p<0.05) compared to the others (CPC-0.52±0.74; CF-0.50±0.75, GF-0.23±0.48 and CGF-0.45±0.83). All posts showed high stress in apical third (CPC-1.40±0.65; SP-2.30±0.44, CF-1.80±0.45, GF-1.20±0.45, CGF-1.70±1.03) Low stress was found in cervical third (CPC-0.20±0.45; CF-0.00±0.00, GF-0.00±0.00, CGF-0.00±0.00), except by SP (1.90±0.65), which showed statistical difference (p<0.05). Customized post showed high stress concentration at the root and conventional glass fiber posts showed more favorable biomechanical behavior.

scholarly journals Influence of ferrule preparation with or without glass fiber post on fracture resistance of endodontically treated teeth

2010 ◽  
Vol 18 (4) ◽  
pp. 360-363 ◽  
Author(s):  
Alexandra Furtado de Lima ◽  
Aloísio Oro Spazzin ◽  
Daniel Galafassi ◽  
Lourenço Correr-Sobrinho ◽  
Bruno Carlini-Júnior
Keyword(s):  
Glass Fiber ◽  
Fracture Resistance ◽  
Fiber Post ◽  
Endodontically Treated Teeth ◽  
Glass Fiber Post
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