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The Effect of Framework Design on Stress Distribution in Implant-Supported FPDs: A 3-D FEM Study

OBJECTIVES: The biomechanical behavior of the superstructure plays an important role in the functional longevity of dental implants. However, information about the influence of framework design on stresses transmitted to the implants and supporting tissues is limited. The purpose of this study was t...

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Autores principales: Eraslan, Oguz, Inan, Ozgur, Secilmis, Asli
Formato: Texto
Lenguaje:English
Publicado: Dental Investigations Society 2010
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2948739/
https://www.ncbi.nlm.nih.gov/pubmed/20922156
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author Eraslan, Oguz
Inan, Ozgur
Secilmis, Asli
author_facet Eraslan, Oguz
Inan, Ozgur
Secilmis, Asli
author_sort Eraslan, Oguz
collection PubMed
description OBJECTIVES: The biomechanical behavior of the superstructure plays an important role in the functional longevity of dental implants. However, information about the influence of framework design on stresses transmitted to the implants and supporting tissues is limited. The purpose of this study was to evaluate the effects of framework designs on stress distribution at the supporting bone and supporting implants. METHODS: In this study, the three-dimensional (3D) finite element stress analysis method was used. Three types of 3D mathematical models simulating three different framework designs for implant-supported 3-unit posterior fixed partial dentures were prepared with supporting structures. Convex (1), concave (2), and conventional (3) pontic framework designs were simulated. A 300-N static vertical occlusal load was applied on the node at the center of occlusal surface of the pontic to calculate the stress distributions. As a second condition, frameworks were directly loaded to evaluate the effect of the framework design clearly. The Solidworks/Cosmosworks structural analysis programs were used for finite element modeling/analysis. RESULTS: The analysis of the von Mises stress values revealed that maximum stress concentrations were located at the loading areas for all models. The pontic side marginal edges of restorations and the necks of implants were other stress concentration regions. There was no clear difference among models when the restorations were loaded at occlusal surfaces. When the veneering porcelain was removed, and load was applied directly to the framework, there was a clear increase in stress concentration with a concave design on supporting implants and bone structure. CONCLUSIONS: The present study showed that the use of a concave design in the pontic frameworks of fixed partial dentures increases the von Mises stress levels on implant abutments and supporting bone structure. However, the veneering porcelain element reduces the effect of the framework and compensates for design weaknesses.
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spelling pubmed-29487392010-10-04 The Effect of Framework Design on Stress Distribution in Implant-Supported FPDs: A 3-D FEM Study Eraslan, Oguz Inan, Ozgur Secilmis, Asli Eur J Dent Original Articles OBJECTIVES: The biomechanical behavior of the superstructure plays an important role in the functional longevity of dental implants. However, information about the influence of framework design on stresses transmitted to the implants and supporting tissues is limited. The purpose of this study was to evaluate the effects of framework designs on stress distribution at the supporting bone and supporting implants. METHODS: In this study, the three-dimensional (3D) finite element stress analysis method was used. Three types of 3D mathematical models simulating three different framework designs for implant-supported 3-unit posterior fixed partial dentures were prepared with supporting structures. Convex (1), concave (2), and conventional (3) pontic framework designs were simulated. A 300-N static vertical occlusal load was applied on the node at the center of occlusal surface of the pontic to calculate the stress distributions. As a second condition, frameworks were directly loaded to evaluate the effect of the framework design clearly. The Solidworks/Cosmosworks structural analysis programs were used for finite element modeling/analysis. RESULTS: The analysis of the von Mises stress values revealed that maximum stress concentrations were located at the loading areas for all models. The pontic side marginal edges of restorations and the necks of implants were other stress concentration regions. There was no clear difference among models when the restorations were loaded at occlusal surfaces. When the veneering porcelain was removed, and load was applied directly to the framework, there was a clear increase in stress concentration with a concave design on supporting implants and bone structure. CONCLUSIONS: The present study showed that the use of a concave design in the pontic frameworks of fixed partial dentures increases the von Mises stress levels on implant abutments and supporting bone structure. However, the veneering porcelain element reduces the effect of the framework and compensates for design weaknesses. Dental Investigations Society 2010-10 /pmc/articles/PMC2948739/ /pubmed/20922156 Text en Copyright 2010 European Journal of Dentistry. All rights reserved.
spellingShingle Original Articles
Eraslan, Oguz
Inan, Ozgur
Secilmis, Asli
The Effect of Framework Design on Stress Distribution in Implant-Supported FPDs: A 3-D FEM Study
title The Effect of Framework Design on Stress Distribution in Implant-Supported FPDs: A 3-D FEM Study
title_full The Effect of Framework Design on Stress Distribution in Implant-Supported FPDs: A 3-D FEM Study
title_fullStr The Effect of Framework Design on Stress Distribution in Implant-Supported FPDs: A 3-D FEM Study
title_full_unstemmed The Effect of Framework Design on Stress Distribution in Implant-Supported FPDs: A 3-D FEM Study
title_short The Effect of Framework Design on Stress Distribution in Implant-Supported FPDs: A 3-D FEM Study
title_sort effect of framework design on stress distribution in implant-supported fpds: a 3-d fem study
topic Original Articles
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2948739/
https://www.ncbi.nlm.nih.gov/pubmed/20922156
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