Influence of dental restorations and mastication loadings on dentine fatigue behaviour: Image-based modelling approach

Abstract Objectives The aim of this study was to use Finite Element Analysis (FEA) to estimate the influence of various mastication loads and different tooth treatments (composite restoration and endodontic treatment) on dentine fatigue. The analysis of fatigue behaviour of human dentine in intact a...

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Veröffentlicht in:Journal of dentistry 2015-05, Vol.43 (5), p.556-567
Hauptverfasser: Vukicevic, Arso M, Zelic, Ksenija, Jovicic, Gordana, Djuric, Marija, Filipovic, Nenad
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container_end_page 567
container_issue 5
container_start_page 556
container_title Journal of dentistry
container_volume 43
creator Vukicevic, Arso M
Zelic, Ksenija
Jovicic, Gordana
Djuric, Marija
Filipovic, Nenad
description Abstract Objectives The aim of this study was to use Finite Element Analysis (FEA) to estimate the influence of various mastication loads and different tooth treatments (composite restoration and endodontic treatment) on dentine fatigue. The analysis of fatigue behaviour of human dentine in intact and composite restored teeth with root-canal-treatment using FEA and fatigue theory was performed. Methods Dentine fatigue behaviour was analysed in three virtual models: intact, composite-restored and endodontically-treated tooth. Volumetric change during the polymerization of composite was modelled by thermal expansion in a heat transfer analysis. Low and high shrinkage stresses were obtained by varying the linear shrinkage of composite. Mastication forces were applied occlusally with the load of 100, 150 and 200 N. Assuming one million cycles, Fatigue Failure Index (FFI) was determined using Goodman's criterion while residual fatigue lifetime assessment was performed using Paris-power law. Results The analysis of the Goodman diagram gave both maximal allowed crack size and maximal number of cycles for the given stress ratio. The size of cracks was measured on virtual models. For the given conditions, fatigue-failure is not likely to happen neither in the intact tooth nor in treated teeth with low shrinkage stress. In the cases of high shrinkage stress, crack length was much larger than the maximal allowed crack and failure occurred with 150 and 200 N loads. The maximal allowed crack size was slightly lower in the tooth with root canal treatment which induced somewhat higher FFI than in the case of tooth with only composite restoration. Conclusions Main factors that lead to dentine fatigue are levels of occlusal load and polymerization stress. However, root canal treatment has small influence on dentine fatigue. Clinical significance The methodology proposed in this study provides a new insight into the fatigue behaviour of teeth after dental treatments. Furthermore, it estimates maximal allowed crack size and maximal number of cycles for a specific case.
doi_str_mv 10.1016/j.jdent.2015.02.011
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The analysis of fatigue behaviour of human dentine in intact and composite restored teeth with root-canal-treatment using FEA and fatigue theory was performed. Methods Dentine fatigue behaviour was analysed in three virtual models: intact, composite-restored and endodontically-treated tooth. Volumetric change during the polymerization of composite was modelled by thermal expansion in a heat transfer analysis. Low and high shrinkage stresses were obtained by varying the linear shrinkage of composite. Mastication forces were applied occlusally with the load of 100, 150 and 200 N. Assuming one million cycles, Fatigue Failure Index (FFI) was determined using Goodman's criterion while residual fatigue lifetime assessment was performed using Paris-power law. Results The analysis of the Goodman diagram gave both maximal allowed crack size and maximal number of cycles for the given stress ratio. The size of cracks was measured on virtual models. For the given conditions, fatigue-failure is not likely to happen neither in the intact tooth nor in treated teeth with low shrinkage stress. In the cases of high shrinkage stress, crack length was much larger than the maximal allowed crack and failure occurred with 150 and 200 N loads. The maximal allowed crack size was slightly lower in the tooth with root canal treatment which induced somewhat higher FFI than in the case of tooth with only composite restoration. Conclusions Main factors that lead to dentine fatigue are levels of occlusal load and polymerization stress. However, root canal treatment has small influence on dentine fatigue. Clinical significance The methodology proposed in this study provides a new insight into the fatigue behaviour of teeth after dental treatments. Furthermore, it estimates maximal allowed crack size and maximal number of cycles for a specific case.</description><identifier>ISSN: 0300-5712</identifier><identifier>EISSN: 1879-176X</identifier><identifier>DOI: 10.1016/j.jdent.2015.02.011</identifier><identifier>PMID: 25731157</identifier><language>eng</language><publisher>England: Elsevier Ltd</publisher><subject>Biomechanics ; Composite materials ; Composite Resins - chemistry ; Computer Simulation ; Dental Restoration, Permanent ; Dental Stress Analysis - methods ; Dentin - injuries ; Dentistry ; Enamel ; Fatigue ; Fatigue (materials) ; Fatigue cracks ; Fatigue failure ; Finite Element Analysis ; Finite element method ; Fractures ; Fractures, Stress ; Human dentine ; Humans ; Image-based modelling ; Influence ; Load ; Mastication ; Mastication - physiology ; Medical imaging ; Models, Biological ; Polymerization ; Prosthesis Design ; Restoration ; Shrinkage ; Stress analysis ; Stresses ; Studies ; Teeth ; Tomography ; Tooth, Nonvital</subject><ispartof>Journal of dentistry, 2015-05, Vol.43 (5), p.556-567</ispartof><rights>Elsevier Ltd</rights><rights>2015 Elsevier Ltd</rights><rights>Copyright © 2015 Elsevier Ltd. 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The analysis of fatigue behaviour of human dentine in intact and composite restored teeth with root-canal-treatment using FEA and fatigue theory was performed. Methods Dentine fatigue behaviour was analysed in three virtual models: intact, composite-restored and endodontically-treated tooth. Volumetric change during the polymerization of composite was modelled by thermal expansion in a heat transfer analysis. Low and high shrinkage stresses were obtained by varying the linear shrinkage of composite. Mastication forces were applied occlusally with the load of 100, 150 and 200 N. Assuming one million cycles, Fatigue Failure Index (FFI) was determined using Goodman's criterion while residual fatigue lifetime assessment was performed using Paris-power law. Results The analysis of the Goodman diagram gave both maximal allowed crack size and maximal number of cycles for the given stress ratio. The size of cracks was measured on virtual models. For the given conditions, fatigue-failure is not likely to happen neither in the intact tooth nor in treated teeth with low shrinkage stress. In the cases of high shrinkage stress, crack length was much larger than the maximal allowed crack and failure occurred with 150 and 200 N loads. The maximal allowed crack size was slightly lower in the tooth with root canal treatment which induced somewhat higher FFI than in the case of tooth with only composite restoration. Conclusions Main factors that lead to dentine fatigue are levels of occlusal load and polymerization stress. However, root canal treatment has small influence on dentine fatigue. Clinical significance The methodology proposed in this study provides a new insight into the fatigue behaviour of teeth after dental treatments. 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The analysis of fatigue behaviour of human dentine in intact and composite restored teeth with root-canal-treatment using FEA and fatigue theory was performed. Methods Dentine fatigue behaviour was analysed in three virtual models: intact, composite-restored and endodontically-treated tooth. Volumetric change during the polymerization of composite was modelled by thermal expansion in a heat transfer analysis. Low and high shrinkage stresses were obtained by varying the linear shrinkage of composite. Mastication forces were applied occlusally with the load of 100, 150 and 200 N. Assuming one million cycles, Fatigue Failure Index (FFI) was determined using Goodman's criterion while residual fatigue lifetime assessment was performed using Paris-power law. Results The analysis of the Goodman diagram gave both maximal allowed crack size and maximal number of cycles for the given stress ratio. The size of cracks was measured on virtual models. For the given conditions, fatigue-failure is not likely to happen neither in the intact tooth nor in treated teeth with low shrinkage stress. In the cases of high shrinkage stress, crack length was much larger than the maximal allowed crack and failure occurred with 150 and 200 N loads. The maximal allowed crack size was slightly lower in the tooth with root canal treatment which induced somewhat higher FFI than in the case of tooth with only composite restoration. Conclusions Main factors that lead to dentine fatigue are levels of occlusal load and polymerization stress. However, root canal treatment has small influence on dentine fatigue. Clinical significance The methodology proposed in this study provides a new insight into the fatigue behaviour of teeth after dental treatments. Furthermore, it estimates maximal allowed crack size and maximal number of cycles for a specific case.</abstract><cop>England</cop><pub>Elsevier Ltd</pub><pmid>25731157</pmid><doi>10.1016/j.jdent.2015.02.011</doi><tpages>12</tpages></addata></record>
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source MEDLINE; Elsevier ScienceDirect Journals
subjects Biomechanics
Composite materials
Composite Resins - chemistry
Computer Simulation
Dental Restoration, Permanent
Dental Stress Analysis - methods
Dentin - injuries
Dentistry
Enamel
Fatigue
Fatigue (materials)
Fatigue cracks
Fatigue failure
Finite Element Analysis
Finite element method
Fractures
Fractures, Stress
Human dentine
Humans
Image-based modelling
Influence
Load
Mastication
Mastication - physiology
Medical imaging
Models, Biological
Polymerization
Prosthesis Design
Restoration
Shrinkage
Stress analysis
Stresses
Studies
Teeth
Tomography
Tooth, Nonvital
title Influence of dental restorations and mastication loadings on dentine fatigue behaviour: Image-based modelling approach
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