scholarly journals Insertion angle of orthodontic mini-implants and their biomechanical performance: finite element analysis

2015 ◽  
Vol 44 (5) ◽  
pp. 273-279 ◽  
Author(s):  
Vinícius de Oliveira Rossi Arantes ◽  
Cassia Belloto Corrêa ◽  
Nadia Lunardi ◽  
Rodolfo Jorge Boeck Neto ◽  
Rubens Spin-Neto ◽  
...  
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
South Korea ◽  
Cortical Bone ◽  
Elastic Deformation ◽  
Cancellous Bone ◽  
Element Analysis ◽  
Insertion Angle ◽  
Mini Implants ◽  
Resistance To Deformation

AbstractObjectiveThe aim of this study was to assess the stresses and strains generated after the application of two types of forces (traction of 200 gf and torsion of 20 N.cm) in two types of orthodontic mini-implants inserted at different (45° and 90° to the cortical bone) angles.Material and methodthree-dimensional models of two brands of mini-implant (SIN – Sao Paulo, Brazil, and RMO – South Korea) were exported and analyzed by finite element analysis (FEA). Analyses were performed on simulations of cortical bone, cancellous bone and the screw.ResultFEA analysis showed that RMO mini-implants had greater elastic deformation when subjected to tensile and torsional forces when compared with SIN mini-implants. For both trademarks and insertion angles tested, there was greater cortical bone deformation, but with the greatest strain located on the mini-implant. Tension on the mini-implant was located in its transmucosal profile region.ConclusionWhen comparing the two brands of mini-implants by FEA, it is fair to conclude that that the larger number of threads and their greater angle of inclination resulted in less resistance to deformation and induced a higher level of tension in the mini-implant and cortical bone when subjected to forces, especially when inserted at an angle of 45º to the cortical bone.

scholarly journals Effect of insertion angle on the stability of orthodontic mini‑implants in a rabbit tibia model: A finite element analysis

2019 ◽  
Vol 87 (2) ◽  
Author(s):  
Víctor M. Araujo-Monsalvo ◽  
Mercy G. González-Aréas ◽  
Elisa Martínez-Coria ◽  
Enrique Flores-Cuamatzi ◽  
Benjamín Araujo-Monsalvo ◽  
...  
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Element Analysis ◽  
Insertion Angle ◽  
Mini Implants ◽  
Rabbit Tibia ◽  
The Stability

scholarly journals Influence of fibromucosa height and loading on the stress distribution of a total prosthesis: a finite element analysis

2021 ◽  
Vol 24 (2) ◽  
Author(s):  
Tarcisio José de Arruda Paes Junior ◽  
João Paulo Mendes Tribst ◽  
Amanda Maria de Oliveira Dal Piva ◽  
Viviane Maria Gonçalves de Figueiredo ◽  
Alexandre Luiz Souto Borges ◽  
...  
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Stress Distribution ◽  
Cortical Bone ◽  
Principal Stress ◽  
Maximum Principal Stress ◽  
Element Analysis ◽  
Total Displacement ◽  
Anterior Guidance ◽  
Mandibular Movements

Purpose: To evaluate the effect of fibromucosa height on the stress distribution and displacement of mandibular total prostheses during posterior unilateral load, posterior bilateral load and anterior guidance using the finite element analysis (FEA). Material and methods: 3D virtual models were made to simulate the stress generated during different mandibular movements in a total prosthesis. The contacts were simulated according to the physiology, being considered perfectly bonded between cortical and medullar bones; and between cortical bone and mucosa. Non-linear frictional contact was used for the total prosthesis base and fibromucosa, allowing the prosthesis to slide over the tissue. The cortical bone base was fixed and the 100 N load was applied as unilateral load, posterior bilateral load and anterior guidance simulation. The required results were for maximum principal stress (MPa), microstrain (mm/mm) and total displacement (mm). The numerical results were converted into colorimetric maps and arranged according to corresponding scales. Results: The stress generated in all situations was directly proportional to the fibromucosa height. The maximum principal stress results demonstrated greater magnitude for anterior guidance, posterior unilateral and posterior bilateral, respectively. Only posterior unilateral load demonstrated an increase in bone microstrain, regardless of the fibromucosa height. Prosthesis displacement was lower under posterior bilateral loading. Conclusion: Posterior bilateral loading is indicated for total prosthesis because it allows lower prosthesis displacement, lower stress concentration at the base of the prosthesis and less bone microstrain.   Keywords Finite element analysis; Occlusion; Total prosthesis.

scholarly journals Finite Element Analysis of Insertion Angle of Absorbable Screws for the Fixation of Radial Head Fractures

2020 ◽  
Vol 12 (6) ◽  
pp. 1710-1717
Author(s):  
Guang‐ming Xu ◽  
Zi‐yang Liang ◽  
Wei Li ◽  
Zheng‐zhong Yang ◽  
Zhi‐bin Chen ◽  
...  
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Radial Head ◽  
Element Analysis ◽  
Radial Head Fractures ◽  
Insertion Angle

scholarly journals Influence of PEEK Coating on Hip Implant Stress Shielding: A Finite Element Analysis

2016 ◽  
Vol 2016 ◽  
pp. 1-10 ◽  
Author(s):  
Jesica Anguiano-Sanchez ◽  
Oscar Martinez-Romero ◽  
Hector R. Siller ◽  
Jose A. Diaz-Elizondo ◽  
Eduardo Flores-Villalba ◽  
...  
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Cancellous Bone ◽  
Stress Shielding ◽  
Design Concept ◽  
Von Mises Stress ◽  
Hip Implants ◽  
Element Analysis ◽  
Stress Transmission ◽  
Von Mises

Stress shielding is a well-known failure factor in hip implants. This work proposes a design concept for hip implants, using a combination of metallic stem with a polymer coating (polyether ether ketone (PEEK)). The proposed design concept is simulated using titanium alloy stems and PEEK coatings with thicknesses varying from 100 to 400 μm. The Finite Element analysis of the cancellous bone surrounding the implant shows promising results. The effective von Mises stress increases between 81 and 92% for the complete volume of cancellous bone. When focusing on the proximal zone of the implant, the increased stress transmission to the cancellous bone reaches between 47 and 60%. This increment in load transferred to the bone can influence mineral bone loss due to stress shielding, minimizing such effect, and thus prolonging implant lifespan.

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