scholarly journals Stress analysis for mandibular screw retained full arch prosthesis, all in 4 concept, with different cantilever extension.

2019 ◽  
Author(s):  
Moaz Mostafa Farrag
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Stress Distribution ◽  
Stress Analysis ◽  
Distribution Pattern ◽  
Analysis Software ◽  
Element Analysis ◽  
Bone Implant ◽  
Cantilever Length ◽  
Distribution Of Stresses

Abstract Compare the stress distribution pattern in two different cantilever length in mandibular screw retained prosthesis by computing the distribution of stresses in Bone/implant interface in different zone, magnitude and Direction of force applied using finite element analysis software.

Effect of length and diameter on stress distribution pattern of INDIDENT dental implants by finite element analysis

2012 ◽  
Vol 2 (1) ◽  
pp. 19 ◽  
Author(s):  
Bobin Saluja ◽  
Masood Alam ◽  
T Ravindranath ◽  
A Mubeen ◽  
Nidhi Adya ◽  
...  
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Stress Distribution ◽  
Distribution Pattern ◽  
Dental Implants ◽  
Element Analysis

Stresses in Teeth and Overlying Crowns

2012 ◽  
Vol 457-458 ◽  
pp. 567-571
Author(s):  
Liliana Sandu ◽  
Florin Topală ◽  
Sorin Porojan
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Stress Distribution ◽  
Numerical Simulations ◽  
Experimental Model ◽  
3D Scanning ◽  
Analysis Software ◽  
Element Analysis ◽  
Equivalent Stresses ◽  
Von Mises

A complete cast crown allows the operator to modify axial tooth contour. The margin should be smooth and distinct and its width has to allow adequate bulk of metal at the margin. The objective of this study was to evaluate, by finite element analysis, the influence of different degree of taper and marginal designs for cast crown preparations, on the stress distribution in teeth and crowns. As experimental model an upper first molar was used. The geometry of the intact tooth were obtained by 3D scanning. The tooth preparations and the complete cast crowns were designed. Models were exported in a finite element analysis software for structural simulations. Von Mises equivalent stresses were calculated and their distribution was plotted graphically. Numerical simulations provide a biomechanical explanation for stress distribution in prepared teeth and overlying crowns.

scholarly journals Analisa Tegangan Kerusakan pada Pin Hopper

2019 ◽  
Vol 8 (1) ◽  
pp. 17-24
Author(s):  
M. N. Setia Nusa
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Stress Distribution ◽  
Stress Analysis ◽  
Calculation Result ◽  
Allowable Stress ◽  
Plate Element ◽  
Visual Examination ◽  
Element Analysis ◽  
As Stress

Hopper pada Stage Regenerator mengalami kerusakan berupa jatuh dan robek. Hal ini disebabkan karena lepasnya salah satu pin yang menjadi tumpuan hopper. Setelah diperiksa ternyata pin tersebut bengkok dan salah satu stoppernya lepas.Dilakukan penelitian dengan analisa tegangan menggunakan Finite Element Analysis (FEA) dengan menggunakan type elemen plat untuk memodelkan shell Hopper dan solid elemen untuk Pin. Analisa tegangan dilakukan pada model Hopper untuk menentukan beban yang bekerja pada Pin kemudian dilakukan FEA pin untuk menentukan tegangan yang terjadi pada pin. Hasil perhitungan: Rupture allowable stress/Sr untuk 100.000 jam operasi sebesar 3,2 ksi (2,24 kg/mm2). Karena tegangan yang terjadi pada pin disebabkan oleh bending maka tegangan yang terjadi harus lebih kecil dari 1,5 Sr = 3,36 kg/mm2, jadi dari FEA distribusi tegangan Pin yang dipakai harus diameter 70 mm.Kata kunci : Hopper, Pin bengkok, Jatuh, FEA, Pin 70 mm.AbstractHopper at the stage regenerator failed due to falling and break, after visual examination it is found that the pin is bent and a stopper goes out. It is then conducted stress analysis using Finite Element Analysis (FEA) by means of plate element mode to model the hopper cell and solid element of the pin stress analysis is conducted for modelling the hopper is to determine working load on the pin followed by FEA to determine stresses taking place on the pin the calculation result are: rupture allowable stress (SR) for 100.000 operation hours is 3.2 Ksi (2.24 kg/mm2). As stress on the pin is caused by bending, the stress should be lower than 1.5 SR or 3.36 kg/mm2, and from FEA stress distribution on the pin should use pin with 70 mm in diameter.Keywords : Hopper, Bend, Fall, FEA, Pin 70 mm

Finite Element Analysis on the Influence of Back-Up Ring on the Sealing Effect of Rubber O-Ring

2011 ◽  
Vol 199-200 ◽  
pp. 1595-1599
Author(s):  
Dian Xin Li ◽  
Hong Lin Zhao ◽  
Shi Min Zhang ◽  
Chang Run Wu ◽  
Xian Long Liu ◽  
...  
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Stress Distribution ◽  
Service Life ◽  
Contact Pressure ◽  
Von Mises Stress ◽  
Analysis Software ◽  
Element Analysis ◽  
Von Mises ◽  
The Right

Based on finite element analysis software ANSYS, the deformation and force condition of the rubber sealing o-ring pre and post with back-up ring under different oil pressure conditions was analyzed. The von mises stress distribution of the o-ring and the change of contact pressure between o-ring and sealing interface pre and post with back-up ring under different oil pressure conditions were discussed. The results show that, the maximum von mises stress of the o-ring is smaller and the maximum von mises stress of the sealing system concentrates on the left top and the right bottom of the back-up ring after using it; the o-ring will not be extruded into the gap of the groove because of the existence of back-up ring which prevents gap-bite and prolongs service life of the o-ring; the contact pressure between o-ring and sealing interface increased, thus the sealing reliability of the system increased.

Determination of the Gasket Stress Distribution

2017 ◽  
Author(s):  
Manfred Schaaf
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Stress Distribution ◽  
Stress Analysis ◽  
Radial Direction ◽  
Fundamental Principle ◽  
European Standard ◽  
Calculation Algorithm ◽  
Element Analysis

The European Standard EN 1591-1 is used for the calculation of bolted flanged joints, stress analysis as well as for tightness proofs. In this calculation procedure gasket characteristics according to EN 13555 are used to describe the mechanical and the tightening behavior of gasket materials. With further developments in the calculation algorithm and the use of the realistic gasket behavior in the calculation more detailed results can be obtained, which are comparable to results obtained from Finite Element Analysis. The flange rotation and the resulting uneven gasket stress distribution in the radial direction during the assembly of the flanged joint is the fundamental principle in this development. The effective compressed gasket width has influence on the required gasket forces for the tightness proof as well as on the mechanical behavior of the flanged joint, and thus also on the stress analysis. In this paper, the determination of the effective gasket width using a newly developed approach [1] is optimized and the verification of this approach with Finite Element Analysis for several different gasket materials and flange geometries is shown.

scholarly journals THREE-DIMENSIONAL FINITE ELEMENT ANALYSIS OF CLASS 2 INLAY ON MANDIBULAR MOLAR USING VARIOUS MATERIALS

2018 ◽  
Vol 6 (7) ◽  
pp. 272-277
Author(s):  
Maj Pankaj Awasthi ◽  
Lt Col Sonali Sharma ◽  
Maj Summerdeep Kaur
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Stress Distribution ◽  
Stress Analysis ◽  
Von Mises Stress ◽  
Element Analysis ◽  
Tooth Structure ◽  
Mandibular Molar ◽  
Von Mises ◽  
Mandibular First Molar

Aim: To study the stress distribution in Class 2 Inlay of various materials on Mandibular Molar. Background: Inlays are fabricated using different materials like gold, porcelain or a cast metal alloy. Difference in the modulus of elasticity of the material and tooth structure would lead to generation of stresses leading to failure of the restoration or loss of tooth structure. Finite Element Analysis (FEA) is a mathematical tool for stress analysis in a structure. Von Mises stress being the combination of normal and shear stresses which occur in all directions. This stress has to be given diligent importance while considering the type and material of restoration to achieve long-term success. Methodology: In our study, stress analysis was performed on the mandibular first molar using a stress analysis software (ANSYS). A computer model of mandibular first molar was generated along with generation of an inlay volume using a FEA software preprocessor. The models with the class 2 inlays of different materials were subjected to 350N and 800N load simulating normal masticatory force and bruxism respectively. Maximum and minimum stresses were calculated for each model separately. Results: Von Mises stress distribution for different materials for normal masticatory forces and bruxism were studied and evaluated. Conclusion: The study revealed the maximum and minimum stresses imposed over the tooth and the restoration and provides insight into the areas which are more prone to fracture under the occlusal load.

scholarly journals Influence of non carious cervical lesions depth, loading point application and restoration on stress distribution pattern in lower premolars: a 2D finite element analysis

2015 ◽  
Vol 31 (2) ◽  
pp. 648-656
Author(s):  
Livia Fávaro Zeola ◽  
Fabrícia Araújo Pereira ◽  
Alexia da Mata Galvão ◽  
Tatiana Carvalho Montes ◽  
Sônia Cristina de Sousa ◽  
...  
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Stress Distribution ◽  
Distribution Pattern ◽  
Cervical Lesions ◽  
Element Analysis

Investigation of the Effect of Abutment Angle Tolerance on the Stress Created in the Fixture and Screw in Dental Implants Using Finite Element Analysis

2021 ◽  
Vol 51 ◽  
pp. 63-76
Author(s):  
Bijan Mohammadi ◽  
Zahra Abdoli ◽  
Ehsan Anbarzadeh
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Stress Distribution ◽  
Dental Implants ◽  
Maximum Stress ◽  
Element Analysis ◽  
Bone Implant ◽  
Implant Placement ◽  
And Control ◽  
Biomechanical Factors

Today, an artificial tooth root called a dental implant is used to replace lost tooth function. Treatment with dental implants is considered an effective and safe method. However, in some cases, the use of dental implants had some failures. The success of dental implants is influenced by several biomechanical factors such as loading type, used material properties, shape and geometry of implants, quality and quantity of bone around implants, surgical method, lack of rapid and proper implant surface's integration with the jaw bone, etc. The main purpose of functional design is to investigate and control the stress distribution on dental implants to optimize their performance. Finite element analysis allows researchers to predict the stress distribution in the bone implant without the risk and cost of implant placement. In this study, the stresses created in the 3A.P.H.5 dental implant's titanium fixture and screw due to the change in abutment angles tolerance have been investigated. The results show that although the fixture and the screw's load and conditions are the same in different cases, the change of the abutment angle and the change in the stress amount also made a difference in the location of maximum stress. The 21-degree abutment puts the fixture in a more critical condition and increases the chance of early plasticization compared to other states. The results also showed that increasing the abutment angle to 24 degrees reduces the stress in the screw, but decreasing the angle to 21 degrees leads to increased screw stress and brings it closer to the fracture.

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