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A finite element analysis to study the stress distribution on distal implants in an all-on-four situation in atrophic maxilla as affected by the tilt of the implants and varying cantilever lengths

AIM: The aim of this work was to evaluate stress distribution on implants in All-on-Four situation with varying distal implant angulations (30°,40°,45°) and varying cantilever lengths (4 mm, 8 mm, 12 mm, 16 mm) in atrophic maxilla using finite element analysis. SETTING AND DESIGN: A in vitro study,...

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Autores principales: Kumari, Anju, Malhotra, Puja, Phogat, Shefali, Yadav, Bhupender, Yadav, Jaiveer, Phukela, Sumit Singh
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Wolters Kluwer - Medknow 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7814689/
https://www.ncbi.nlm.nih.gov/pubmed/33487969
http://dx.doi.org/10.4103/jips.jips_70_20
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author Kumari, Anju
Malhotra, Puja
Phogat, Shefali
Yadav, Bhupender
Yadav, Jaiveer
Phukela, Sumit Singh
author_facet Kumari, Anju
Malhotra, Puja
Phogat, Shefali
Yadav, Bhupender
Yadav, Jaiveer
Phukela, Sumit Singh
author_sort Kumari, Anju
collection PubMed
description AIM: The aim of this work was to evaluate stress distribution on implants in All-on-Four situation with varying distal implant angulations (30°,40°,45°) and varying cantilever lengths (4 mm, 8 mm, 12 mm, 16 mm) in atrophic maxilla using finite element analysis. SETTING AND DESIGN: A in vitro study, finite element analysis. MATERIALS AND METHODOLOGY: Three-dimensional finite element model of an edentulous maxilla restored with a prosthesis supported by four implants was reconstructed to carry out the analysis. Three different configurations, corresponding to 3 tilt degrees of the distal implants (30°, 40°, and 45°) were subjected to 4 loading simulations. STATISTICAL ANALYSIS USED: The results of the simulations obtained were evaluated in terms of Von Mises equivalent stress levels at the bone-implant interface. RESULT: From a stress-level viewpoint, the 45° model was revealed to be the most critical for peri-implant bone. In all the loading simulations, the maximum stress values were always found at the neck of the distal implants. With increasing distal implant tilt, cantilever length reduces depending on the quality of bone. At 30° angulation of distal implant a maximum cantilever length of 16 mm may be given if the quality of bone is D3 but only 8 mm cantilever may be recommended if bone quality is D4. At 40° angulation, 16 mm in D3 bone and 0 mm in D4 bone whereas at 45° angulation, it reduces to 12 mm in D3 bone and no cantilever is recommended with D4 bone. CONCLUSION: The 45° tilt induced higher stress values at the bone-implant interface, especially in the distal aspect, than the other 2 tilts analyzed. Stress values increased with increased cantilever length which was further influenced by the distal implant tilt and the quality of the bone.
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spelling pubmed-78146892021-10-01 A finite element analysis to study the stress distribution on distal implants in an all-on-four situation in atrophic maxilla as affected by the tilt of the implants and varying cantilever lengths Kumari, Anju Malhotra, Puja Phogat, Shefali Yadav, Bhupender Yadav, Jaiveer Phukela, Sumit Singh J Indian Prosthodont Soc Original Article AIM: The aim of this work was to evaluate stress distribution on implants in All-on-Four situation with varying distal implant angulations (30°,40°,45°) and varying cantilever lengths (4 mm, 8 mm, 12 mm, 16 mm) in atrophic maxilla using finite element analysis. SETTING AND DESIGN: A in vitro study, finite element analysis. MATERIALS AND METHODOLOGY: Three-dimensional finite element model of an edentulous maxilla restored with a prosthesis supported by four implants was reconstructed to carry out the analysis. Three different configurations, corresponding to 3 tilt degrees of the distal implants (30°, 40°, and 45°) were subjected to 4 loading simulations. STATISTICAL ANALYSIS USED: The results of the simulations obtained were evaluated in terms of Von Mises equivalent stress levels at the bone-implant interface. RESULT: From a stress-level viewpoint, the 45° model was revealed to be the most critical for peri-implant bone. In all the loading simulations, the maximum stress values were always found at the neck of the distal implants. With increasing distal implant tilt, cantilever length reduces depending on the quality of bone. At 30° angulation of distal implant a maximum cantilever length of 16 mm may be given if the quality of bone is D3 but only 8 mm cantilever may be recommended if bone quality is D4. At 40° angulation, 16 mm in D3 bone and 0 mm in D4 bone whereas at 45° angulation, it reduces to 12 mm in D3 bone and no cantilever is recommended with D4 bone. CONCLUSION: The 45° tilt induced higher stress values at the bone-implant interface, especially in the distal aspect, than the other 2 tilts analyzed. Stress values increased with increased cantilever length which was further influenced by the distal implant tilt and the quality of the bone. Wolters Kluwer - Medknow 2020 2020-10-08 /pmc/articles/PMC7814689/ /pubmed/33487969 http://dx.doi.org/10.4103/jips.jips_70_20 Text en Copyright: © 2020 The Journal of Indian Prosthodontic Society http://creativecommons.org/licenses/by-nc-sa/4.0 This is an open access journal, and articles are distributed under the terms of the Creative Commons Attribution-NonCommercial-ShareAlike 4.0 License, which allows others to remix, tweak, and build upon the work non-commercially, as long as appropriate credit is given and the new creations are licensed under the identical terms.
spellingShingle Original Article
Kumari, Anju
Malhotra, Puja
Phogat, Shefali
Yadav, Bhupender
Yadav, Jaiveer
Phukela, Sumit Singh
A finite element analysis to study the stress distribution on distal implants in an all-on-four situation in atrophic maxilla as affected by the tilt of the implants and varying cantilever lengths
title A finite element analysis to study the stress distribution on distal implants in an all-on-four situation in atrophic maxilla as affected by the tilt of the implants and varying cantilever lengths
title_full A finite element analysis to study the stress distribution on distal implants in an all-on-four situation in atrophic maxilla as affected by the tilt of the implants and varying cantilever lengths
title_fullStr A finite element analysis to study the stress distribution on distal implants in an all-on-four situation in atrophic maxilla as affected by the tilt of the implants and varying cantilever lengths
title_full_unstemmed A finite element analysis to study the stress distribution on distal implants in an all-on-four situation in atrophic maxilla as affected by the tilt of the implants and varying cantilever lengths
title_short A finite element analysis to study the stress distribution on distal implants in an all-on-four situation in atrophic maxilla as affected by the tilt of the implants and varying cantilever lengths
title_sort finite element analysis to study the stress distribution on distal implants in an all-on-four situation in atrophic maxilla as affected by the tilt of the implants and varying cantilever lengths
topic Original Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7814689/
https://www.ncbi.nlm.nih.gov/pubmed/33487969
http://dx.doi.org/10.4103/jips.jips_70_20
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