Finite element analysis of endodontically treated tooth restored with different posts under thermal and mechanical loading

2011 ◽  
Vol 1 (3) ◽  
pp. 75 ◽  
Author(s):  
Ozkan ADIGÜZEL ◽  
Senem YİĞİT ÖZER ◽  
Emrullah BAHŞİ ◽  
İzzet YAVUZ
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Mechanical Loading ◽  
Maximum Stress ◽  
Von Mises Stress ◽  
Stress Concentrations ◽  
Element Analysis ◽  
Endodontically Treated Tooth ◽  
Von Mises ◽  
Titanium Post

Aim: This study compared the stress distributions of endodontically treated tooth restored with carbon and titanium post under thermal and mechanical loading conditions. Methodology: A 3-dimensional finite element model was created to represent in a labiolingual cross-sectional view of an endodontically treated maxillary central incisor tooth with its supporting structures. It was modified according to two post systems with different physical properties consisting titanium, and carbon fiber. Stress distribution and stress values were then calculated by considering the three dimensional von Mises stress criteria. Results: A 100-N static vertical occlusal load was applied on the node at the center of occlusal surface of the tooth. The von Mises stress values for carbon post model was on the coronal third and the cervical area of the root in the range of 436,16 and 3,59 MPa,  for titanium post model was 590,55 and 3,05 MPa. Thermal stress values for carbon post model showed that maximum stress concentrations were noted on the coronal third and the top of the post area of the root in the range of 509,94 and 6,38 MPa. Titanium post model showed that maximum stress concentrations were noted on the coronal third and top of the post area of the root in the range of 1165,06 and 3,06 MPa. Conclusion: This study shows that the titanium post yields larger stresses than the carbon post under thermal conditions.  How to cite this article: Adıgüzel Ö, Yiğit Özer S, Bahşi E, Yavuz İ. Finite element analysis of endodontically treated tooth restored with different posts under thermal and mechanical loading. Int Dent Res 2011;3:75-80. Linguistic Revision: The English in this manuscript has been checked by at least two professional editors, both native speakers of English.

scholarly journals Three-dimensional Finite Element Analysis of Endodontically Treated Tooth Restored with Carbon and Titanium Posts

2011 ◽  
Vol 1 (2) ◽  
pp. 55
Author(s):  
Özkan ADIGÜZEL ◽  
Sadullah KAYA ◽  
Senem YİĞİT ÖZER ◽  
Yalçın DEĞER ◽  
Emine GÖNCÜ BAŞARAN ◽  
...  
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Three Dimensional ◽  
Von Mises Stress ◽  
Element Analysis ◽  
Dimensional Finite Element ◽  
Endodontically Treated Tooth ◽  
Von Mises ◽  
Three Dimensional Finite Element ◽  
Titanium Post

Aim: This study compared the stress distributions of endodontically treated tooth restored with carbon and titanium post during different loading conditions. Methodology: A 3-dimensional finite element model was created to represent an endodontically treated maxillary central incisor tooth with its supporting structures. Stress distribution and stress values were then calculated by considering the three dimensional von Mises stress criteria. Results: A 100-N static vertical occlusal load was applied on the node at the center of occlusal surface of the tooth. The von Mises stress values for carbon post model was on the coronal third and the cervical area of the root in the range of 353.149 and 13.878 MPa,  for titanium post model was 540.736 and 22.777 MPa. Conclusion: This study shows that the titanium post yields larger stresses than the carbon post.  How to cite this article: Adıgüzel Ö, Kaya S, Yiğit Özer S, Değer Y, Göncü Başaran E, Yavuz İ. Three-dimensional Finite Element Analysis of Endodontically Treated Tooth Restored with Carbon and Titanium Posts. Int Dent Res 2011;2:55-59. Linguistic Revision: The English in this manuscript has been checked by at least two professional editors, both native speakers of English.

scholarly journals Effect of Fiber Posts on Stress Distribution of Endodontically Treated Upper Premolars: Finite Element Analysis

Nanomaterials ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 1708 ◽  
Author(s):  
Maciej Zarow ◽  
Mirco Vadini ◽  
Agnieszka Chojnacka-Brozek ◽  
Katarzyna Szczeklik ◽  
Grzegorz Milewski ◽  
...  
Keyword(s):  
Finite Element ◽  
Stress Distribution ◽  
Resin Composite ◽  
Von Mises Stress ◽  
Stress Distributions ◽  
Stress Concentrations ◽  
Element Analysis ◽  
Endodontically Treated Tooth ◽  
Maxillary Premolars ◽  
Von Mises

By means of a finite element method (FEM), the present study evaluated the effect of fiber post (FP) placement on the stress distribution occurring in endodontically treated upper first premolars (UFPs) with mesial–occlusal–distal (MOD) nanohybrid composite restorations under subcritical static load. FEM models were created to simulate four different clinical situations involving endodontically treated UFPs with MOD cavities restored with one of the following: composite resin; composite and one FP in the palatal root; composite and one FP in the buccal root; or composite and two FPs. As control, the model of an intact UFP was included. A simulated load of 150 N was applied. Stress distribution was observed on each model surface, on the mid buccal–palatal plane, and on two horizontal planes (at cervical and root-furcation levels); the maximum Von Mises stress values were calculated. All analyses were replicated three times, using the mechanical parameters from three different nanohybrid resin composite restorative materials. In the presence of FPs, the maximum stress values recorded on dentin (in cervical and root-furcation areas) appeared slightly reduced, compared to the endodontically treated tooth restored with no post; in the same areas, the overall Von Mises maps revealed more favorable stress distributions. FPs in maxillary premolars with MOD cavities can lead to a positive redistribution of potentially dangerous stress concentrations away from the cervical and the root-furcation dentin.

scholarly journals Evaluation of Stress Distribution and Force in External Hexagonal Implant: A 3-D Finite Element Analysis

2021 ◽  
Vol 18 (19) ◽  
pp. 10266
Author(s):  
Vinod Bandela ◽  
Ram Basany ◽  
Anil Kumar Nagarajappa ◽  
Sakeenabi Basha ◽  
Saraswathi Kanaparthi ◽  
...  
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Stress Distribution ◽  
Maximum Stress ◽  
Axial Direction ◽  
Von Mises Stress ◽  
P Value ◽  
Implant Surface ◽  
Element Analysis ◽  
Von Mises

Purpose: To analyze the stress distribution and the direction of force in external hexagonal implant with crown in three different angulations. Materials and Methods: A total of 60 samples of geometric models were used to analyze von Mises stress and direction of force with 0-, 5-, and 10-degree lingual tilt. Von Mises stress and force distribution were evaluated at nodes of hard bone, and finite element analysis was performed using ANSYS 12.1 software. For calculating stress distribution and force, we categorized and labeled the groups as Implant A1, Implant A2, and Implant A3, and Implant B1, Implant B2, and Implant B3 with 0-, 5-, and 10-degree lingual inclinations, respectively. Inter- and intra-group comparisons were performed using ANOVA test. A p-value of ≤0.05 was considered statistically significant. Results: In all the three models, overall maximum stress was found in implant model A3 on the implant surface (86.61), and minimum was found on model A1 in hard bone (26.21). In all the three models, the direction of force along three planes was maximum in DX (0.01025) and minimum along DZ (0.002) direction with model B1. Conclusion: Maximum von Mises stress and the direction of force in axial direction was found at the maximum with the implant of 10 degrees angulation. Thus, it was evident that tilting of an implant influences the stress concentration and force in external hex implants.

Comparison of Torque Transmitting Shaft Connectivity Using a Trilobe Polygon Connection and an Involute Spline

2000 ◽  
Vol 122 (1) ◽  
pp. 130-135 ◽  
Author(s):  
Zella L. Kahn-Jetter ◽  
Eugene Hundertmark ◽  
Suzanne Wright
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
The Other ◽  
Von Mises Stress ◽  
Stress Concentrations ◽  
Element Analysis ◽  
Principal Compressive Stress ◽  
Torque Transmission ◽  
Von Mises ◽  
Involute Spline

The results of a finite element analysis of a trilobe polygon shaft connection used as an alternative for a spline for torque transmission is presented. These results are compared to the results of a finite element analysis previously performed on an involute spline. It is shown that the tensile stress in the polygon shaft is significantly smaller than in the involute spline and is smaller than all the other stresses in both the shaft and the hub in the polygon connection. Furthermore, the magnitudes and distributions of the maximum principal compressive stress, the shear stress, and the Von Mises stress are nearly the same on the shaft and the hub. It appears that polygonal connections can be more advantageous than splined connections because of lower stresses and the lack of stress concentrations typical of splines. [S1050-0472(00)00601-2]

scholarly journals KERUSAKAN DAN PERANCANGAN ULANG ALTERNATIF GIRDER PADA LINTASAN TRIPPER SESUAI SNI 03-1729-2002

2016 ◽  
Vol 17 (3) ◽  
pp. 167
Author(s):  
Djoko W Karmiadji ◽  
Rhandi Mulia ◽  
Eddy Djatmiko
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Maximum Stress ◽  
Von Mises Stress ◽  
Structural Failure ◽  
Element Analysis ◽  
Mechanical Calculation ◽  
Design Alternatives ◽  
Von Mises ◽  
Calculation Analysis

<p>Abstrak<br />Kegagalan fungsi girder pada lintasan tripper yang sering terjadi disebabkan oleh keretakan pada penopang silang dan tegak, terjadinya defleksi berlebih pada batang utama, dan perubahan posisi pada kedua kolom. Kerusakan strukur diakibatkan oleh ketidaksesuaian pembebanan yang diterima, sehingga memperlemah komponennya dan dapat berakibat runtuhnya struktur girder. Studi dilakukan dengan mengkaji desain yang sudah ada melalui pendefenisian pembebanan, selanjutnya melakukan perhitungan mekanika pada tiga model pembebanan yang berbeda dan pengecekan kelayakan desain dengan metode LRFD berdasarkan SNI 03-1729-2002 dengan validasi menggunakan analisis elemen hingga. Hasil menunjukkan terjadinya ketidaksesuaian pembebanan yang berakibat kerusakan girder, sehingga diperlukan desain alternatif melalui pemilihan profil, perhitungan kelayakan profil dan analisis ulang untuk memastikan kehandalan rancangan. Dari hasil analisis perhitungan dapat disimpulkan bahwa desain alternatif mempunyai kehandalan yang memadai yaitu defleksinya 0,35 mm dibanding desain lama 15,96 mm berdasarkan perhitungan mekanik, sedangkan hasil analisis elemen hingga, defleksi desain baru 1,08 mm dan desain lama 10,37 mm. Tegangan maksimum desain baru adalah aman terhadap material yang digunakan, yaitu SS400 dengan kekuatan sebesar 245 MPa, dimana hasil perhitungan mekanika diperoleh tegangan maksimum desain baru 52,00 MPa, sedangkan tegangan maksimum hasil analisis elemen hingga adalah 56,31 MPa dan tegangan Von Mises 143,39 MPa.<br />Kata kunci : girder, tripper, LFRD, elemen hingga, Standar Nasional Indonesia (SNI).</p><p><br />Abstract<br />Malfunction of girder on track tripper that often occurred is caused by cracks in the cross and upright supports, occurrence of excessive deflection on main bar, and a change in position of the both columns. Structural failure is caused by loading discrepancies received, so it is weaken its components and resulted in the collapse of the girder structure. The study was conducted by reviewing existing design through loading analysis, then performing the mechanical calculation on three different loading models and checking the feasibility of the design with LRFD method based on SNI 03-1729-2002 with validation using finite element analysis. Results showed the loading discrepancies resulting in damaged girder, so it is necessary to make design alternatives through the selection of profiles, re-calculation and feasibility analysis of the beam to ensure the reliability of the design. From the calculation analysis, it can be concluded that the alternative design has adequate reliability. Based on mechanical calculations the deflection is 0.35 mm compared to 15.96 mm of the old design, while the result of finite element analysis determine 1.08 mm deflection of the new design and 10.37 mm in old design. The maximum stress of the new design is safe for the material used, ie SS400 with a strength of 245 MPa, wherein mechanical calculation resulted in obtained maximum stress of the new design is 52.00 MPa, while the maximum stress through finite element analysis result is 56.31 MPa and Von Mises stress is 143.39 Mpa.<br />Keywords: girder, tripper, LFRD, finite element, National Indonesian Standard (SNI).</p>

scholarly journals Kyphoplasty of Osteoporotic Fractured Vertebrae: A Finite Element Analysis about Two Types of Cement

2019 ◽  
Vol 2019 ◽  
pp. 1-7
Author(s):  
Carolin Meyer ◽  
Kerstin van Gaalen ◽  
Tim Leschinger ◽  
Max J. Scheyerer ◽  
Wolfram F. Neiss ◽  
...  
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Vertebral Body ◽  
Lumbar Vertebrae ◽  
Von Mises Stress ◽  
Vertebral Compression Fractures ◽  
Stress Concentrations ◽  
Lower Stress ◽  
Element Analysis ◽  
Von Mises

If conservative treatment of osteoporotic vertebral compression fractures fails, vertebro- or kyphoplasty is indicated. Usually, polymethylmethacrylate cement (PMMA) is applied coming along with many disadvantageous features. Aluminum-free glass-polyalkenoate cement (GPC) appears to be a benefit alternative material. This study aimed at comparing the mean stress values in human vertebrae after kyphoplasty with PMMA and GPC (IlluminOss™) at hand of a finite element analysis. Three models were created performing kyphoplasty using PMMA or IlluminOss™, respectively, at two native, human lumbar vertebrae (L4) while one remains intact. Finite element analysis was performed using CT-scans of every vertebra. Moreover the PMMA-treated vertebra was used as a model as analyses were executed using material data of PMMA and of GPC. The unimpaired, spongious bone showed potentials of 0.25 MPa maximally. After augmentation stress levels showed fivefold increase, rising from externally to internally, revealing stress peaks at the ventral border of the spinal canal. At central areas of cement 1 MPa is measured in both types of cement. Around these central areas the von Mises stress decreased about 25-50% (0.5-0.75 MPa). If workload of 500 N was applied, the stress appeared to be more centralized at the IlluminOss™-model, similar to the unimpaired. Considering the endplates the GPC model also closely resembles the unimpaired. Comparing the PMMA-treated vertebral body and the GPC-simulation, there is an obvious difference. While the PMMA-treated model showed a central stress peak of 5 MPa, the GPC-simulation of the same vertebral body presents lower stress of 1.2-2.5 MPa. Finite element analysis showed that IlluminOss™ (GPC), used in kyphoplasty of vertebral bodies, creates lower level stress and strain compared to standardly used PMMA, leading to lower stress concentrations on the cranial and caudal vertebral surface especially. GPC appears to own advantageous biological and clinical relevant features.

scholarly journals Finite Element Analysis of Stress in Bone and Abutment-Implant Interface under Static and Cyclic Loadings

2020 ◽  
Author(s):  
Saeed Nokar ◽  
Hamid Jalali ◽  
Farideh Nozari ◽  
Mahnaz Arshad
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Stress Concentration ◽  
Stress Distribution ◽  
Maximum Stress ◽  
Von Mises Stress ◽  
Element Analysis ◽  
Bone Implant ◽  
Factors Affecting ◽  
Von Mises

Objectives: The success of implant treatment depends on many factors affecting the bone-implant, implant-abutment, and abutment-prosthesis interfaces. Stress distribution in bone plays a major role in success/failure of dental implants. This study aimed to assess the pattern of stress distribution in bone and abutment-implant interface under static and cyclic loadings using finite element analysis (FEA). Materials and Methods: In this study, ITI implants (4.1×12 mm) placed at the second premolar site with Synocta abutments and metal-ceramic crowns were simulated using SolidWorks 2007 and ABAQUS software. The bone-implant contact was assumed to be 100%. The abutments were tightened with 35 Ncm preload torque according to the manufacturer’s instructions. Static and cyclic loads were applied in axial (116 Ncm), lingual (18 Ncm), and mesiodistal (24 Ncm) directions. The maximum von Mises stress and strain values ​​were recorded. Results: The maximum stress concentration was at the abutment neck during both static and cyclic loadings. Also, maximum stress concentration was observed in the cortical bone. The loading stress was higher in cyclic than static loading. Conclusion: Within the limitations of this study, it can be concluded that the level of stress in single-unit implant restorations is within the tolerable range by bone.

scholarly journals 3D Finite Element Analysis of Rotary Instruments in Root Canal Dentine with Different Elastic Moduli

2021 ◽  
Vol 11 (6) ◽  
pp. 2547 ◽  
Author(s):  
Carlo Prati ◽  
João Paulo Mendes Tribst ◽  
Amanda Maria de Oliveira Dal Piva ◽  
Alexandre Luiz Souto Borges ◽  
Maurizio Ventre ◽  
...  
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Root Canal ◽  
Elastic Moduli ◽  
Reaction Force ◽  
Von Mises Stress ◽  
Elastic Behavior ◽  
Element Analysis ◽  
Heat Treated ◽  
Von Mises

The aim of the present investigation was to calculate the stress distribution generated in the root dentine canal during mechanical rotation of five different NiTi endodontic instruments by means of a finite element analysis (FEA). Two conventional alloy NiTi instruments F360 25/04 and F6 Skytaper 25/06, in comparison to three heat treated alloys NiTI Hyflex CM 25/04, Protaper Next 25/06 and One Curve 25/06 were considered and analyzed. The instruments’ flexibility (reaction force) and geometrical features (cross section, conicity) were previously investigated. For each instrument, dentine root canals with two different elastic moduli(18 and 42 GPa) were simulated with defined apical ratios. Ten different CAD instrument models were created and their mechanical behaviors were analyzed by a 3D-FEA. Static structural analyses were performed with a non-failure condition, since a linear elastic behavior was assumed for all components. All the instruments generated a stress area concentration in correspondence to the root canal curvature at approx. 7 mm from the apex. The maximum values were found when instruments were analyzed in the highest elastic modulus dentine canal. Strain and von Mises stress patterns showed a higher concentration in the first part of curved radius of all the instruments. Conventional Ni-Ti endodontic instruments demonstrated higher stress magnitudes, regardless of the conicity of 4% and 6%, and they showed the highest von Mises stress values in sound, as well as in mineralized dentine canals. Heat-treated endodontic instruments with higher flexibility values showed a reduced stress concentration map. Hyflex CM 25/04 displayed the lowest von Mises stress values of, respectively, 35.73 and 44.30 GPa for sound and mineralized dentine. The mechanical behavior of all rotary endodontic instruments was influenced by the different elastic moduli and by the dentine canal rigidity.

Investigating the Calibration Curves for a Two Component Cutting Tool Lathe Dynamometer Using Finite Element Analysis

2016 ◽  
Vol 24 ◽  
pp. 71-84
Author(s):  
Osezua Obehi Ibhadode ◽  
Ishaya Musa Dagwa ◽  
Akii Okonigbon Akhaehomen Ibhadode
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Cutting Tool ◽  
Von Mises Stress ◽  
Equation Modeling ◽  
Element Analysis ◽  
Calibration Curves ◽  
Two Component ◽  
Applied Forces ◽  
Von Mises

Calibration curves of a multi-component dynamometer is of essence in machining operations in a lathe machine as they serve to provide values of force and stress components for cutting tool development and optimization. In this study, finite element analysis has been used to obtain the deflection and stress response of a two component cutting tool lathe dynamometer, for turning operation, when the cutting tool is subjected to cutting and thrust forces from 98.1N to 686.7N (10 to 70kg-wts), at intervals of 98.1N(10kg-wt). By obtaining the governing equation, modeling the dynamometer assembly, defining boundary conditions, generating the assembly mesh, and simulating in Inventor Professional; horizontal and vertical components of deflection by the dynamometer were read off for three different loading scenarios. For these three loading scenarios, calibration plots by experiment compared with plots obtained from simulation by finite element analysis gave accuracies of 79%, 95%, 84% and 36%, 57%, 63% for vertical and horizontal deflections respectively. Also, plots of horizontal and vertical components of Von Mises stress against applied forces were obtained.

scholarly journals Simulasi Kekuatan Mekanik Sudu Turbin Angin Horizontal Menggunakan Software Simscale

2021 ◽  
Vol 4 (2) ◽  
Author(s):  
Mubni Nazar ◽  
Anggito Pringgo Tetuko ◽  
Djuhana Djuhana
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Von Mises Stress ◽  
Element Analysis ◽  
Von Mises

Penelitian ini dilakukan untuk meningkatkan koefisien daya yang maksimal. Salah satunya dengan mengunakan kualitas sudu yang baik. Untuk mengoptimalkan fungsi turbin angin penulis menggunakan material sudu pada turbin angin dengan menggunakan Acrylonitrine Butadine Styrene (ABS). Oleh karena itu pada penelitian ini metode yang digunakan adalah metode Finite Element Analysis Simulasi yang dipilih adalah dynamic. Penelitian ini adalah pengujian kekuatan sudu turbin angin horizontal dengan variasi kecepatan angin 10 – 20 m/s ditinjau dari von mises stress dan displacement. Dari hasil simulasi kecepatan angin memiiki pengaruh terhadap distribusi stress dan displacement. Material yang digunakan masih berada di bawah batas kekuatan material, semakin besar gaya yang diberikan semakin besar nilai stress dan displacement. Pada hasil simulasi didapatkan nilai stress minimum 5.8 Pa stress maksimum 22.94 Sedangkan dalam pengujian displacement dihasilkan nilai minimum 1.27 m displacement maksimum 4.99 m.

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