Influence of the TMJ Implant Geometry on Stress Distribution

2012 ◽  
Vol 488-489 ◽  
pp. 991-995 ◽  
Author(s):  
Zohreh Arabshahi ◽  
Jamal Kashani ◽  
Mohammed Rafiq Abdul Kadir ◽  
Abbas Azari
Keyword(s):  
Stress Distribution ◽  
Temporomandibular Joint ◽  
Contact Surface ◽  
Equivalent Stress ◽  
Three Dimensional ◽  
Surface Region ◽  
Implant Design ◽  
Three Dimensional Model ◽  
Element Analysis ◽  
Applied Loading

The purpose of this study was to investigate the influence of Temporomandibular Joint implant geometry on stress distribution in total reconstruction of temporomandibular joint. A three dimensional model of a lower jaw of a patient was developed from a Computed Tomography scan images. Anatomical curvature and flat contact surface of implant design and fixation screws were modeled. Two implanted mandibles were then compared by means of finite element analysis. The muscle forces for incisal clenching were applied. The equivalent stress resulted in contact surface region of the bone and implant and in fixation screw holes were investigated to evaluate the designs. In applied loading condition, The results showed that anatomical design of implant was more preferred and it will lead to long-term success of implant.

Finite Element Analysis of Poor Distal Contact of the Femoral Component of a Cementless Hip Endoprosthesis

1993 ◽  
Vol 207 (4) ◽  
pp. 255-261 ◽  
Author(s):  
M Taylor ◽  
E W Abel
Keyword(s):  
Finite Element ◽  
Stress Distribution ◽  
Influencing Factor ◽  
Three Dimensional ◽  
Stress Distributions ◽  
Element Analysis ◽  
Hip Endoprosthesis ◽  
Applied Loading ◽  
Femoral Geometry ◽  
Contact Models

The difficulty of achieving good distal contact between a cementless hip endoprosthesis and the femur is well established. This finite element study investigates the effect on the stress distribution within the femur due to varying lengths of distal gap. Three-dimensional anatomical models of two different sized femurs were generated, based upon computer tomograph scans of two cadaveric specimens. A further six models were derived from each original model, with distal gaps varying from 10 to 60 mm in length. The resulting stress distributions within these were compared to the uniform contact models. The extent to which femoral geometry was an influencing factor on the stress distribution within the bone was also studied. Lack of distal contact with the prosthesis was found not to affect the proximal stress distribution within the femur, for distal gap lengths of up to 60 mm. In the region of no distal contact, the stress within the femur was at normal physiological levels associated with the applied loading and boundary conditions. The femoral geometry was found to have little influence on the stress distribution within the cortical bone. Although localized variations were noted, both femurs exhibited the same general stress distribution pattern.

scholarly journals A Finite Element Analysis to Compare Stress Distribution on Extra-Short Implants with Two Different Internal Connections

2019 ◽  
Vol 8 (8) ◽  
pp. 1103 ◽  
Author(s):  
García-Braz ◽  
Prados-Privado ◽  
Zanatta ◽  
Calvo-Guirado ◽  
Prados-Frutos ◽  
...  
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Stress Distribution ◽  
Axial Load ◽  
Three Dimensional ◽  
Dimensional Model ◽  
Stress Concentrations ◽  
Three Dimensional Model ◽  
Element Analysis ◽  
Short Implants

Background: The goal of this study was to analyze the stress distribution on two types of extra-short dental implants with 5 mm of length: An internal hexagon (IH) and morse taper connection (MT). Methods: The three-dimensional model was composed of trabecular and cortical bone, a crown, an extra-short dental implant and their components. An axial load of 150 N was applied and another inclined 30° with the same magnitude. Results: Stress concentrations on the IH implant are observed in the region of the first threads for the screw. However, in the MT implant the highest stress occurs at the edges of the upper implant platform. Conclusions: In view of the results obtained in this study the two types of prosthetic fittings present a good stress distribution. The Morse taper connections presented better behavior than the internal in both loading configurations.

Comparison of Stress Distribution in Surrounding Bone during Insertion of Dental Implants on Four Implant Threads under the Effect of an Impact: A Finite Element Study

2022 ◽  
Vol 54 ◽  
pp. 89-101
Author(s):  
Noureddine Djebbar ◽  
Abdessamed Bachiri ◽  
Benali Boutabout
Keyword(s):  
Finite Element ◽  
Stress Distribution ◽  
Load Transfer ◽  
Three Dimensional ◽  
Primary Stability ◽  
Implant Design ◽  
Element Analysis ◽  
Three Dimensional Finite Element ◽  
The Impact ◽  
Surrounding Bone

The design of an implant thread plays a fundamental role in the osseointegration process, particularly in low-density bone. It has been postulated that design features that maximize the surface area available for contact may improve mechanical anchorage and stability in cancellous bone. The primary stability of a dental implant is determined by the mechanical engagement between the implant and bone at the time of implant insertion. The contact area of implant-bone interfaces and the concentrated stresses on the marginal bones are principal concerns of implant designers. Numerous factors influence load transfer at the bone-implant interface, for example, the type of loading, surface structure, amount of surrounding bone, material properties of the implant and implant design. The purpose of this study was to investigate the effects of the impact two different projectile of implant threads on stress distribution in the jawbone using three-dimensional finite element analysis.

Finite Element Analysis of Static Strength and Fatigue Strength of Hydraulic Shield Support

2011 ◽  
Vol 332-334 ◽  
pp. 2161-2165
Author(s):  
Han Wu Liu ◽  
Gui Bing Pu ◽  
Yun Hui Du ◽  
Peng Zhang
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Fatigue Strength ◽  
Working Conditions ◽  
Equivalent Stress ◽  
Three Dimensional ◽  
Static Strength ◽  
Three Dimensional Model ◽  
Element Analysis ◽  
Study Results

By using the geometry modeling software Pro/E, the three-dimensional model of hydraulic shield support has been built. Considering of the loading conditions and displacement constraints which the hydraulic shield support suffers from under the actual working conditions, the static strength and fatigue strength of the hydraulic shield support were analyzed by FEM when they were in two different typical working conditions of the support height, and the weakest part which was discovered in the analysis was improved in its structure. The study results showed that the designed hydraulic shield support could meet the requests of the static strength and fatigue strength. The column of the hydraulic shield support and the ear plate which locates in the connection area of the column and the push beam are the weakest parts. The counterforce given by the ground mainly focuses on the mid-back position of the hydraulic shield support, which meets the requirements of saving labor when they were removed. In the Finite Element Analysis when the reinforcement ribs were added to the ear plate, we found that the maximum equivalent stress is reduced by 150 MPa and the fatigue life coefficient is reduced markedly as well. The possibility of the fatigue breakage was decreased largely after the structure was modified and the service life of the hydraulic shield support was improved. These prove that the improvement of the hydraulic shield support structure is reasonable and feasible.

Finite Element Analysis and Comparison of Screw Pump Models in Uniform Pressure

2014 ◽  
Vol 490-491 ◽  
pp. 727-732
Author(s):  
You Jun Zhang ◽  
Chen Chang Zhang
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Equivalent Stress ◽  
Three Dimensional ◽  
Dimensional Model ◽  
Three Dimensional Model ◽  
Element Analysis ◽  
Screw Pump ◽  
Single Screw ◽  
Comparison Results

This paper establishes the two-dimensional model, three-dimensional simplified model and three-dimensional of the single-screw pump stators ,and accomplishes their displacement and stress analysis in even pressure inside the stator using ANSYS software. This paper analyzes the comparison results of the combined displacement, equivalent stress and shear stress cloud in the XY plane of single screw pump stator’s three different models. The results manifest the significant differences of the three models for finite element analysis. This study validates that finite element analysis of three-dimensional model leads closer to the true situation.

Numerical Analysis of the Equivalent Stress at the Interface Bone/Threaded Dental Implant

2017 ◽  
Vol 34 ◽  
pp. 82-93 ◽  
Author(s):  
Yamina Chelahi Chikr ◽  
Benali Boutabout ◽  
Ali Merdji ◽  
Kheira Bouzouina
Keyword(s):  
Dental Implant ◽  
Equivalent Stress ◽  
Three Dimensional ◽  
Dental Prosthesis ◽  
Published Data ◽  
Stress Distributions ◽  
Three Dimensional Model ◽  
Element Analysis ◽  
Bone Implant ◽  
Materials Used

The purpose of this study was to develop a new three-dimensional model of an osseointegrated molar dental prosthesis and to carry out finite element analysis to evaluate stress distributions and intensities in the bone and in the components of dental prosthesis under three loads (corono-apical, distal-mesial and buccal-lingual) were applied to the top of the occlusal face of the prosthesis crown. The interfacial stresses were also determined inside and outside of the threading when the dental prosthesis system was subjected to one of three masticatory loads. All materials used in the models were considered to be isotropic, homogeneous and linearly elastic. The elastic properties, loads and constraints used in the model were taken from published data. In this study, the stress concentration occurred around the threaded dental implant neck. Thus, this area should be preserved clinically in order to maintain the bone–implant interface structurally and functionally.

Comparative Stress Distribution of Implant-Retained Mandibular Ball-Supported and Bar-Supported Overlay Dentures: A Finite Element Analysis

2011 ◽  
Vol 37 (4) ◽  
pp. 421-429 ◽  
Author(s):  
Fariborz Vafaei ◽  
Masoumeh Khoshhal ◽  
Saeed Bayat-Movahed ◽  
Ahmad Hassan Ahangary ◽  
Farnaz Firooz ◽  
...  
Keyword(s):  
Stress Distribution ◽  
Strain Distribution ◽  
Treatment Options ◽  
Three Dimensional ◽  
Distribution Patterns ◽  
Three Dimensional Model ◽  
Element Analysis ◽  
Second Molar ◽  
Edentulous Mandible ◽  
Tomography Scan

Abstract Implant-retained mandibular ball-supported and bar-supported overlay dentures are the two most common treatment options for the edentulous mandible. The superior option in terms of strain distribution should be determined. The three-dimensional model of mandible (based on computerized tomography scan) and its overlying implant-retained bar-supported and ball-supported overlay dentures were simulated using SolidWorks, NURBS, and ANSYS Workbench. Loads A (60 N) and B (60 N) were exerted, respectively, in protrusive and laterotrusive motions, on second molar mesial, first molar mesial, and first premolar. The strain distribution patterns were assessed on (1) implant tissue, (2) first implant-bone, and (3) second implant-bone interfaces. Protrusive: Strain was mostly detected in the apical of the fixtures and least in the cervical when bar design was used. On the nonworking side, however, strain was higher in the cervical and lower in the apical compared with the working side implant. Laterotrusive: The strain values were closely similar in the two designs. It seems that both designs are acceptable in terms of stress distribution, although a superior pattern is associated with the application of bar design in protrusive motion.

scholarly journals Finite Element Analysis of a New Dental Implant Design Optimized for the Desirable Stress Distribution in the Surrounding Bone Region

Prosthesis ◽  
2020 ◽  
Vol 2 (3) ◽  
pp. 225-236 ◽  
Author(s):  
Luigi Paracchini ◽  
Christian Barbieri ◽  
Mattia Redaelli ◽  
Domenico Di Croce ◽  
Corrado Vincenzi ◽  
...  
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Stress Distribution ◽  
Cortical Bone ◽  
Dental Implant ◽  
Neck Region ◽  
Implant Design ◽  
Three Dimensional Model ◽  
Element Analysis ◽  
Surrounding Bone

Dental implant macro- and micro-shape should be designed to maximize the delivery of optimal favorable stresses in the surrounding bone region. The present study aimed to evaluate the stress distribution in cortical and cancellous bone surrounding two models of dental implants with the same diameter and length (4.0 × 11 mm) and different implant/neck design and thread patterns. Sample A was a standard cylindric implant with cylindric neck and V-shaped threads, and sample B was a new conical implant with reverse conical neck and with “nest shape” thread design, optimized for the favorable stress distribution in the peri-implant marginal bone region. Materials and methods: The three-dimensional model was composed of trabecular and cortical bone corresponding to the first premolar mandibular region. The response to static forces on the samples A and B were compared by finite element analysis (FEA) using an axial load of 100 N and an oblique load of 223.6 N (resulting from a vertical load of 100 N and a horizontal load of 200 N). Results: Both samples provided acceptable results under loadings, but the model B implant design showed lower strain values than the model A implant design, especially in cortical bone surrounding the neck region of the implant. Conclusions: Within the limitation of the present study, analyses suggest that the new dental implant design may minimize the transfer of stress to the peri-implant cortical bone.

scholarly journals FINITE ELEMENT ANALYSIS WITH STATIC AND DYNAMIC CONDITIONS OF SPARE WHEEL CARRIER FOR OH 1526 FABRICATED BY SAPH 440 HOT ROLLED STEEL

2019 ◽  
Vol 4 (1) ◽  
pp. 34
Author(s):  
Norbertus Krisna Aditya Utomo ◽  
Lydia Anggraini
Keyword(s):  
Yield Strength ◽  
Cyclic Load ◽  
Equivalent Stress ◽  
Three Dimensional ◽  
Shock Load ◽  
Live Load ◽  
Three Dimensional Model ◽  
Element Analysis ◽  
Automotive Company ◽  
Steady Load

<p>Spare Wheel Carrier is a component that must exists in a heavy duty vehicle. The function of this part is to store additional wheel in order to deal with punctures that might happen to the tire. This part is usually placed in the middle of the vehicle in order to maintain the position of center of gravity of the vehicle. The purpose of this research is to analyze the strength of SAPH 440 as the manufacturing material of the Spare Wheel Carrier from one automotive company. The Spare Wheel Carrier will endure a load of a replacement tire for its entire cyclic load. The load itself will generate stresses and strains in the part, especially in the welding joint. Therefore, the analysis is to be done to provide the automotive company with the result to determine improvement that should be made. The method that is used in this research is using CATIA software to create the three dimensional model of the part. Later, we import the model to ANSYS software to analyze the equivalent stress, equivalent elastic strain, directional deformation, and cyclic load for steady load, live load, and shock load. The calculation shows that the part can endure the force from steady load, with the estimated cyclic load of 70,723 cycles. But for live load, the stress and strain will be happening around the yield strength and offset yield strength and the estimated cyclic load declining significantly to 6,358.6 cycles. Furthermore, the shock load result stated that the stress and the strain are exceeding the yield strength and reduces the estimated cyclic load to 1,843.9 cycles. In conclusion, the material is proven to be safe for usage as the Spare Wheel Carrier manufacturing material.<br />Keywords. spare wheel carrier, SAPH 440, stress, strain, deformation, cyclic load</p>

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