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Stress distribution pattern of screw-retained restorations with segmented vs. non-segmented abutments: A finite element analysis
Background. Screw-retained restorations are favored in some clinical situations such as limited inter-occlusal spaces. This study was designed to compare stresses developed in the peri-implant bone in two different types of screw-retained restorations (segmented vs. non-segmented abutment) using a f...
Autores principales: | , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Tabriz University of Medical Sciences
2017
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5666213/ https://www.ncbi.nlm.nih.gov/pubmed/29184629 http://dx.doi.org/10.15171/joddd.2017.027 |
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author | Aalaei, Shima Rajabi Naraki, Zahra Nematollahi, Fatemeh Beyabanaki, Elaheh Shahrokhi Rad, Afsaneh |
author_facet | Aalaei, Shima Rajabi Naraki, Zahra Nematollahi, Fatemeh Beyabanaki, Elaheh Shahrokhi Rad, Afsaneh |
author_sort | Aalaei, Shima |
collection | PubMed |
description | Background. Screw-retained restorations are favored in some clinical situations such as limited inter-occlusal spaces. This study was designed to compare stresses developed in the peri-implant bone in two different types of screw-retained restorations (segmented vs. non-segmented abutment) using a finite element model. Methods. An implant, 4.1 mm in diameter and 10 mm in length, was placed in the first molar site of a mandibular model with 1 mm of cortical bone on the buccal and lingual sides. Segmented and non-segmented screw abutments with their crowns were placed on the simulated implant in each model. After loading (100 N, axial and 45° non-axial), von Mises stress was recorded using ANSYS software, version 12.0.1. Results. The maximum stresses in the non-segmented abutment screw were less than those of segmented abutment (87 vs. 100, and 375 vs. 430 MPa under axial and non-axial loading, respectively). The maximum stresses in the peri-implant bone for the model with segmented abutment were less than those of non-segmented ones (21 vs. 24 MPa, and 31 vs. 126 MPa under vertical and angular loading, respectively). In addition, the micro-strain of peri-implant bone for the segmented abutment restoration was less than that of non-segmented abutment. Conclusion. Under axial and non-axial loadings, non-segmented abutment showed less stress concentration in the screw, while there was less stress and strain in the peri-implant bone in the segmented abutment. |
format | Online Article Text |
id | pubmed-5666213 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2017 |
publisher | Tabriz University of Medical Sciences |
record_format | MEDLINE/PubMed |
spelling | pubmed-56662132017-11-28 Stress distribution pattern of screw-retained restorations with segmented vs. non-segmented abutments: A finite element analysis Aalaei, Shima Rajabi Naraki, Zahra Nematollahi, Fatemeh Beyabanaki, Elaheh Shahrokhi Rad, Afsaneh J Dent Res Dent Clin Dent Prospects Original Article Background. Screw-retained restorations are favored in some clinical situations such as limited inter-occlusal spaces. This study was designed to compare stresses developed in the peri-implant bone in two different types of screw-retained restorations (segmented vs. non-segmented abutment) using a finite element model. Methods. An implant, 4.1 mm in diameter and 10 mm in length, was placed in the first molar site of a mandibular model with 1 mm of cortical bone on the buccal and lingual sides. Segmented and non-segmented screw abutments with their crowns were placed on the simulated implant in each model. After loading (100 N, axial and 45° non-axial), von Mises stress was recorded using ANSYS software, version 12.0.1. Results. The maximum stresses in the non-segmented abutment screw were less than those of segmented abutment (87 vs. 100, and 375 vs. 430 MPa under axial and non-axial loading, respectively). The maximum stresses in the peri-implant bone for the model with segmented abutment were less than those of non-segmented ones (21 vs. 24 MPa, and 31 vs. 126 MPa under vertical and angular loading, respectively). In addition, the micro-strain of peri-implant bone for the segmented abutment restoration was less than that of non-segmented abutment. Conclusion. Under axial and non-axial loadings, non-segmented abutment showed less stress concentration in the screw, while there was less stress and strain in the peri-implant bone in the segmented abutment. Tabriz University of Medical Sciences 2017 2017-09-20 /pmc/articles/PMC5666213/ /pubmed/29184629 http://dx.doi.org/10.15171/joddd.2017.027 Text en © 2017 Moradi Haghgoo et al. http://creativecommons.org/licenses/by/4.0/ This is an Open Access article published and distributed by Tabriz University of Medical Sciences under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. |
spellingShingle | Original Article Aalaei, Shima Rajabi Naraki, Zahra Nematollahi, Fatemeh Beyabanaki, Elaheh Shahrokhi Rad, Afsaneh Stress distribution pattern of screw-retained restorations with segmented vs. non-segmented abutments: A finite element analysis |
title | Stress distribution pattern of screw-retained restorations with segmented vs. non-segmented abutments: A finite element analysis |
title_full | Stress distribution pattern of screw-retained restorations with segmented vs. non-segmented abutments: A finite element analysis |
title_fullStr | Stress distribution pattern of screw-retained restorations with segmented vs. non-segmented abutments: A finite element analysis |
title_full_unstemmed | Stress distribution pattern of screw-retained restorations with segmented vs. non-segmented abutments: A finite element analysis |
title_short | Stress distribution pattern of screw-retained restorations with segmented vs. non-segmented abutments: A finite element analysis |
title_sort | stress distribution pattern of screw-retained restorations with segmented vs. non-segmented abutments: a finite element analysis |
topic | Original Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5666213/ https://www.ncbi.nlm.nih.gov/pubmed/29184629 http://dx.doi.org/10.15171/joddd.2017.027 |
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