scholarly journals A comparative biomechanical analysis of suprapectineal and infrapectineal fixation on acetabular anterior column fracture by finite element modeling

2019 ◽  
Author(s):  
MEHMET YÜCENS ◽  
KADİR BAHADIR ALEMDAROĞLU ◽  
AHMET ÖZMERİÇ ◽  
SERKAN İLTAR ◽  
AHMET ÖZGÜR YILDIRIM ◽  
...  
Keyword(s):  
Finite Element ◽  
Plate Fixation ◽  
Three Dimensional ◽  
Fracture Line ◽  
Biomechanical Analysis ◽  
Vertical Shear ◽  
Anterior Column ◽  
Fixation Method ◽  
Stable Fixation ◽  
Element Analysis

Background: The aim of this study is to compare the stability and implant stresses of suprapectineal plate with infrapectineal plate in three subconfigurations of the screw types. Methods: The stabilities of different fixation methods were compared by finite-element analysis on six models. Three infrapectineal models and three suprapectineal models each with locked, unlocked or combined screws were employed. Three-dimensional finite element stress analysis was performed by using isotropic materials with a load of 2.3 kN applied at standing positions. Motion at the fracture line was measured on four different points that are located at pubic and iliac side of the fracture line. Results: Infrapectineal plate fixation with unlocked screws was found to be the most stable fixation method with 0.006 mm displacement of fragments in all axes at standing positions. Suprapectineal unlocked method was found to be the most unstable in standing positions with maximum distraction values of 0.46 mm vertical shear movement in x-axis, -0.14 mm distraction in y-axis and -0.33 mm lateral shear in z-axis. Conclusions: To our results infrapectineal unlocked plate supplies the most stable fixation with least implant stress in contrary to the suprapectineal unlocked plate, which has the lowest stability and highest implant stresses. Keywords: Acetabular fracture; anterior column; suprapectineal; infrapectineal; fixation; finite element.

scholarly journals Finite element and biomechanical analysis of risk factors for implant failure during tension band plating

2020 ◽  
Vol 48 (11) ◽  
pp. 030006052097207
Author(s):  
Jing Ding ◽  
Fei Wang ◽  
Fangchun Jin ◽  
Zhen-kai Wu ◽  
Pin-quan Shen
Keyword(s):  
Residual Stress ◽  
Finite Element ◽  
Finite Element Model ◽  
Three Dimensional ◽  
Biomechanical Model ◽  
Element Model ◽  
Tension Band ◽  
Biomechanical Analysis ◽  
Implant Failure ◽  
Element Analysis

Objective Tension band plating has recently gained widespread acceptance as a method of correcting angular limb deformities in skeletally immature patients. We examined the role of biomechanics in procedural failure and devised a new method of reducing the rate of implant failure. Methods In the biomechanical model, afterload (static or cyclic) was applied to each specimen. The residual stress of the screw combined with different screw sizes and configurations were measured and compared by X-ray diffraction. With regard to static load and similar conditions, the stress distribution was analyzed according to a three-dimensional finite element model. Results The residual stress was close to zero in the static tension group, whereas it was very high in the cyclic load group. The residual stress of screws was significantly lower in the convergent group and parallel group than in the divergent group. The finite element model showed similar results. Conclusions In both the finite element analysis and biomechanical tests, the maximum stress of the screw was concentrated at the position where the screws enter the cortex. Cyclic loading is the primary cause of implant failure.

Three-Dimensional Finite Element Analysis of a Simplified Compression Plate Fixation System

1984 ◽  
Vol 106 (4) ◽  
pp. 295-301 ◽  
Author(s):  
E. J. Cheal ◽  
W. C. Hayes ◽  
A. A. White ◽  
S. M. Perren
Keyword(s):  
Finite Element ◽  
Strain Gage ◽  
Composite Beam ◽  
Plate Fixation ◽  
Three Dimensional ◽  
Beam Theory ◽  
Fracture Site ◽  
Test Model ◽  
Element Analysis ◽  
Compression Plate

A three-dimensional, linear finite element model was generated for an intact plexiglass tube with an attached six-hole stainless steel compression plate. We examined external forces representing axial, off-center axial, and four-point bending, along with superimposed plate and screw pretension. Strain gage experiments were conducted to test model validity and the finite element results were contrasted to a composite beam theory solution. Excellent correspondence was observed between finite element and strain gage data for the most significant strain components. Composite beam theory tended to overestimate the neutral axis shift which results from plate application. The model also demonstrated fracture site distraction due to plate pretension, and the tendency for outer screw failure for the combination of bending-closed with a preload in the plate and screws.

Three-Dimensional Finite Element Analysis of Dental Implant Threads

2018 ◽  
Vol 876 ◽  
pp. 138-146
Author(s):  
Aswin Yodrux ◽  
Nantakrit Yodpijit ◽  
Manutchanok Jongprasithporn
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Dental Implant ◽  
Three Dimensional ◽  
Biomechanical Analysis ◽  
3D Fem ◽  
Element Analysis ◽  
Dimensional Finite Element ◽  
Three Dimensional Finite Element ◽  
States Patent

This paper presents the use of Three-Dimensional Finite Element Method (3D-FEM) for biomechanical analysis on dental implant prosthetics. This research focuses on three patents of threads of dental implant systems from United States Patent and Trademark Office (USPTO) and two new conceptual design models. The three-dimensional finite element analysis is performed on dental implant models, with compressive forces of 50, 100, and 150 N, and a shear force of 20 N with the force angle of 60 degrees with the normal line respectively. The Stress and displacement analysis is conducted at four different areas (abutment, implant, cortical bone, and cancellous bone). Findings from this research provide guidelines for new product design of dental implant prosthetics with stress distribution and displacement characteristics.

scholarly journals Investigation of a Modified Novel Technique in Bilateral Sagittal Splitting Osteotomy Fixation: Finite Element Analysis and In Vitro Biomechanical Test

2020 ◽  
Vol 2020 ◽  
pp. 1-8
Author(s):  
Li-Ren Chang ◽  
Chien-Chung Chen ◽  
Seng Feng Jeng ◽  
Yu-Ray Chen ◽  
Lain-Chyr Hwang ◽  
...  
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Plate Fixation ◽  
Von Mises Stress ◽  
Fixation Method ◽  
Osteotomy Site ◽  
Biomechanical Test ◽  
Fixation Failure ◽  
Element Analysis

Purpose. To evaluate the biomechanical properties of the modified novel 2-hole monocortical plate fixation (2HMCPf) and traditional 4-hole monocortical plate fixation (4HMCPf) techniques in bilateral sagittal splitting osteotomy (BSSO) synthesis using a finite element analysis (FEA) and an in vitro biomechanical test with the application of a shearing loading force on a sawbone mandible model. Materials and Methods. A three-dimensional mandible models were generated using the geometry obtained from the computerized tomography image of a sawbone mandible. Plates and screws were generated and combined with the mandible in a CAD environment. The 2HMCPf and traditional 4HMCPf techniques for BSSO osteosynthesis were then analyzed under the occlusal load using the FEA. An in vitro biomechanical test was executed to verify the result of FEA. The force on fixation failure and pattern of failure were recorded. Results. The results revealed that the von Mises Stress on the mandible cortical bone (75.98 MPa) and the screw/plate (457.19 MPa) of the 2HMCPf group was lower than that of the 4HMCPf group (987.68 MPa, 1781.59 MPa). The stress concentrated on the central region of the 4HMCPf group and the distal set of the 2HMCPf group. In vitro study using the sawbone mandible model showed mechanical failure at the region of the proximal segment near the osteotomy site with the 4HMCPf group (average 32.198 N) but no failure on the fixation sites with the 2HMCPf group. Instead, the mandible sawbone fractured on the condyle neck region (average 44.953 N). Conclusion. From the biomechanical perspective, we proved that the 2HMCPf method was able to withstand a higher shearing loading force than the 4HMCPf fixation method in BSSO osteosynthesis.

scholarly journals “FINITE WITH INFINITE POSSIBILITIES”- “A BOON TO IMPLANT DENTISTRY” - A BRIEF OVERVIEW ON FINITE ELEMENT ANALYSIS

2020 ◽  
pp. 60-62
Author(s):  
Sangita Show ◽  
Arka Kanti Dey
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Three Dimensional ◽  
Biomechanical Analysis ◽  
Complex Structures ◽  
The Finite Element Method ◽  
Element Analysis ◽  
Photoelastic Model ◽  
Implant Dentistry ◽  
Model Strain

Numerous techniques to determine stress distribution around the peri-implant bone, for instance photoelastic model, strain gauge analysis, and three-dimensional (3D) finite element analysis have been extensively studied, however finite element analysis still remains the most widely utilized technique. This paper briefly reviews the fundamental concepts, applications pertaining to dental implants, various advantages as well as limitations of finite element analysis. The finite element method not only serves as a significant tool for biomechanical analysis, it also enables to reveal stress within complex structures and analyzing their mechanical properties. Keeping in mind the various limitations of the method further improvements might be made which would help to widen its range of applications in various domains of dental sciences.

Three-Dimensional Finite Element Analysis of Several Internal and External Pelvis Fixations

2000 ◽  
Vol 122 (5) ◽  
pp. 516-522 ◽  
Author(s):  
J. M. Garcı´a ◽  
M. Doblare´ ◽  
B. Seral ◽  
F. Seral ◽  
D. Palanca ◽  
...  
Keyword(s):  
Finite Element ◽  
Pelvic Ring ◽  
Three Dimensional ◽  
Fixation Method ◽  
Individual Treatment ◽  
Element Analysis ◽  
Sacroiliac Screws ◽  
Dimensional Finite Element ◽  
The Stability ◽  
Three Dimensional Finite Element

The Finite Element Method (FEM) can be used to analyze very complex geometries, such as the pelvis, and complicated constitutive behaviors, such as the heterogeneous, nonlinear, and anisotropic behavior of bone tissue or the noncompression, nonbending character of ligaments. Here, FEM was used to simulate the mechanical ability of several external and internal fixations that stabilize pelvic ring disruptions. A customized pelvic fracture analysis was performed by computer simulation to determine the best fixation method for each individual treatment. The stability of open-book fractures with external fixations at either the iliac crests or the pelvic equator was similar, and increased greatly when they were used in combination. However, external fixations did not effectively stabilize rotationally and vertically unstable fractures. Adequate stabilization was only achieved using an internal pubis fixation with two sacroiliac screws. [S0148-0731(00)00905-5]

scholarly journals Biomechanical Analysis of the Tuning Fork Plate Versus Dual Pelvic Screws in a Sacrectomy Model: A Finite Element Study

2021 ◽  
pp. 219256822098379
Author(s):  
Amin Joukar ◽  
Jwalant Mehta ◽  
Vijay K. Goel ◽  
David S. Marks
Keyword(s):  
Finite Element ◽  
Tuning Fork ◽  
Screw Fixation ◽  
Plate Fixation ◽  
Biomechanical Analysis ◽  
Plate Versus ◽  
Element Analysis ◽  
Fixation Devices ◽  
Iliac Screw ◽  
Fixation System

Study Design: To evaluate the mechanical effectiveness of “tuning fork” plate fixation system by comparing with dual iliac screw fixation under different spinal motion through finite element analysis (FEA). Objective: Lumbosacral deficiencies occur from birth defects or following destruction by tumors. The objective of this study was to evaluate the mechanical effectiveness of the tuning fork plate compared to dual iliac screw system which is the gold standard fixation in treating lumbosacral deficiencies. This is an innovative fixation device for treating lumbosacral deficiencies. Methods: The deficiency model was prepared using a previously developed and validated finite element T10-pelvis model. To create the lumbo-sacral deficiency the segments between L3 and sacrum were removed from the model. The model was then instrumented from T10 to L2 segments and the ilium using either the tuning fork plate or a dual iliac screw construct. With the ilium fixed, the T10 vertebrae was subjected to 10 Nm moment and 400 N follower load to simulate spinal motions. Range of motion (ROM) of spine and stresses on the instrumentation were calculated for 2 fixation devices and compared with each other. Results: The 2 fixation systems demonstrate a comparable motion reduction in all loading modes. Stress values were higher in the dual iliac screw constructs compared with the tuning fork plate fixation system. The factor of safety of the tuning fork plate device was higher than the dual iliac screw fixation by 50%. Conclusions: Both fixation devices had similar performance in motion reduction at spine levels. However, based on predicted implant stresses there were less chances of implant failure in the fork plate fixation, compared to the dual iliac screw system.

Fixation of humeral intercondylar fractures using a lateral plate in 14 dogs supported by finite element analysis of repair

2007 ◽  
Vol 20 (04) ◽  
pp. 285-290 ◽  
Author(s):  
D. P. Comiskey ◽  
B. Mac Donald ◽  
C. B. Garvan ◽  
W. T. Mc Cartney
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Plate Fixation ◽  
Distal Humerus ◽  
Fracture Site ◽  
Fixation Method ◽  
Fe Modelling ◽  
Lateral Plate ◽  
Element Analysis ◽  
Micro Motion

SummaryFourteen Spaniels that presented with an intercondylar fracture of the distal humerus were managed using a lateral plate and an additional pin in twelve cases. Fixation of the fracture was achieved using a plate applied laterally which incorporated the transcondylar lag screw in the most distal hole. Of the 14 cases, two had poor results, one of which was a bilateral case, whilst the remaining 12 cases had good or very good results with only occasional stiffness or lameness. Finite element (FE) modelling of a distal humerus was generated, and loading of fracture repairs using a lateral plate and caudal plate was completed in a comparative study to determine which fixation method resisted micro-motion most effectively. Finite element analysis revealed that the lateral plate fixation provided significantly more resistance to micro movement at the fracture site that the caudal plate fixation, with 40% more micro-motion in the latter.

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