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 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 Fracture resistance of weakened human premolar roots after use of a glass fiber post together with accessory posts

2014 ◽  
Vol 43 (4) ◽  
pp. 280-285
Author(s):  
Clarissa Estefani SEGATO ◽  
Flávia Lucisano Botelho do AMARAL ◽  
Fabiana Mantovani Gomes FRANÇA ◽  
Flávia Martão FLÓRIO ◽  
Roberta Tarkany BASTING
Keyword(s):  
Glass Fiber ◽  
Fracture Strength ◽  
Statistical Difference ◽  
Resin Composite ◽  
Resin Cement ◽  
Test Machine ◽  
Fiber Post ◽  
Mean Values ◽  
Root Canals ◽  
Glass Fiber Post

OBJECTIVE: To evaluate the fracture strength of human premolar teeth with wide root canals, restored with glass fiber posts and resin cement, together with different numbers of accessory posts.MATERIAL AND METHOD: Thirty-six premolars received standardized preparations that simulated weakened roots, and were divided into three groups (n=12): G0 - glass fiber post (Reforpost/Angelus) cementation with dual cure resin cement (Rely X ARC/3M ESPE); G1 - glass fiber post cementation and one accessory post (Reforpin/Angelus), with dual cure resin cement; G2 - glass fiber post cementation and two accessory posts, with dual cure resin cement. Resin composite cores were placed in each tooth. A metal coping was placed in a standardized position on the cores to perform the compressive tests using a test machine. Testing was performed applying a force parallel to the long axis of the teeth at a speed of 0.5 mm/min. Fracture mode was analyzed under a stereoscopic loupe, classified by scores.RESULT: the Analysis of Variance (ANOVA) was applied, and there was no statistical difference in the mean values of fracture strength among the groups (in kgf): G0 = 91.1 ± 56.9; G1 = 104.7 ± 66.6; G2 = 106.1 ± 51.9. Greater frequency of fracture or cracks was observed in the cervical one-third of the root in the teeth without cemented accessory posts, but no statistical difference was observed among the fracture modes.CONCLUSION: The number of accessory posts cemented into debilitated roots had no influence on either fracture strength or type of fracture of pre-molar roots.

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.

CAD/CAM Milled Glass Fiber Posts: Adaptation and Mechanical Behavior in Flared Root Canals

2021 ◽  
Author(s):  
MER Gama ◽  
GS Balbinot ◽  
GC Ferreira ◽  
EG Mota ◽  
VCB Leitune ◽  
...  
Keyword(s):  
Bond Strength ◽  
Glass Fiber ◽  
Fiber Post ◽  
Root Canals ◽  
Fiber Posts ◽  
Cad Cam ◽  
Glass Fiber Posts ◽  
Glass Fiber Post ◽  
Post And Core ◽  
Push Out

SUMMARY This study aimed to evaluate the cementation and mechanical behavior of flared root canals restored with CAD/CAM milled glass fiber post-and-core systems. Sixty-six endodontically treated human canines with a flared root canal were divided into three different groups according to the type of post: GPF received prefabricated posts; GREL received relined glass fiber posts, and GMILLED received CAD/CAM milled glass fiber posts. Cementation was performed with self-adhesive resin cement. The samples were submitted to x-ray microcomputed tomography analysis for the analysis of voids and gaps. The roots were sectioned and submitted to the push-out bond strength test. The load-to-fracture was evaluated in post-and-core systems. GMILLED presented lower void and lower gap volumes when compared to GPF and GREL. On the load-to-fracture test, GREL presented statistically significant higher values than GMILLED. GPF values had no statistically significant difference from the two other groups. On the push-out bond strength test, GPF presented statistically significant lower values when compared to GREL and GMILLED. The most common failure pattern was between dentin and cement in all groups. CAD/CAM milled glass fiber post-and-core systems presented an enhanced adaptation of glass fiber posts to flared root canal systems. Their results were comparable to relined posts in bond strength, while load-to-fracture-results for GMILLED were lower than those for GPF.

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.

Research of Stress and Deformation Distributions in Central Incisors Restored with Different Glass Fiber Post Types

2011 ◽  
Vol 295-297 ◽  
pp. 2400-2405
Author(s):  
Zhi Xin Huang ◽  
Cai Fu Qian ◽  
Peng Liu ◽  
Xu Liang Deng ◽  
Qing Cai ◽  
...  
Keyword(s):  
Glass Fiber ◽  
Maximum Stress ◽  
Oral Treatment ◽  
Equivalent Stress ◽  
Three Dimensional ◽  
Fiber Post ◽  
Glass Fiber Post ◽  
Post And Core ◽  
Stress And Deformation ◽  
The One

Three-dimensional digital oral treatment technology based on anatomical features of jaw bone and teeth was applied for modeling. Three dimensional finite element models for the restorative systems with straight glass fiber post, screw glass fiber post and one-piece glass fiber post-and-core were established. Stress and deformation under external bite force were calculated and compared among different post types. Comparing the maximum von Mises equivalent stress in the whole restorative system for the straight post, the screw post and the one-piece glass fiber post-and-core finds that the one-piece glass fiber post-and-core is effective to lower the maximum stress and obtain uniform stress distribution of the teeth. Even in each part of the restorative system like post, crown and root, the maximum stress in the case of one-piece glass fiber post-and-core is still lowest. Using one-piece glass fiber post-and-core, the overall deformation of the restorative system is decreased greatly.

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.

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