Elastic properties and strain-to-crack-initiation of calcium phosphate bone cements: revelations of a high-resolution measurement technique

Calcium phosphate cements (CPCs) should ideally have mechanical properties similar to those of the bone tissue the material is used to replace or repair. Usually, the compressive strength of the CPCs is reported and, more rarely, the elastic modulus. Conversely, scarce or no data are available on Po...

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Autores: Ajaxon, Ingrid, Acciaioli, A., Lionello, G., Ginebra Molins, Maria Pau|||0000-0002-4700-5621, Ohman, Caroline, Baleani, M., Persson, Cecilia
Tipo de recurso: artículo
Fecha de publicación:2017
País:España
Institución:Universitat Politècnica de Catalunya (UPC)
Repositorio:UPCommons. Portal del coneixement obert de la UPC
Idioma:inglés
OAI Identifier:oai:upcommons.upc.edu:2117/107887
Acceso en línea:https://hdl.handle.net/2117/107887
https://dx.doi.org/10.1016/j.jmbbm.2017.06.023
Access Level:acceso abierto
Palabra clave:Bone cements
Calcium phosphate
Apatite
Materials--Mechanical properties
Bone cement
Brushite
Elastic modulus
Mechanical properties
Monetite
Poisson's ratio
Materials -- Propietats mecàniques
Fosfat de calci
Àrees temàtiques de la UPC::Enginyeria dels materials
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spelling Elastic properties and strain-to-crack-initiation of calcium phosphate bone cements: revelations of a high-resolution measurement techniqueAjaxon, IngridAcciaioli, A.Lionello, G.Ginebra Molins, Maria Pau|||0000-0002-4700-5621Ohman, CarolineBaleani, M.Persson, CeciliaBone cementsCalcium phosphateApatiteMaterials--Mechanical propertiesApatiteBone cementBrushiteCalcium phosphateElastic modulusMechanical propertiesMonetitePoisson's ratioMaterials -- Propietats mecàniquesFosfat de calciÀrees temàtiques de la UPC::Enginyeria dels materialsCalcium phosphate cements (CPCs) should ideally have mechanical properties similar to those of the bone tissue the material is used to replace or repair. Usually, the compressive strength of the CPCs is reported and, more rarely, the elastic modulus. Conversely, scarce or no data are available on Poisson's ratio and strain-to-crack-initiation. This is unfortunate, as data on the elastic response is key to, e.g., numerical model accuracy. In this study, the compressive behaviour of brushite, monetite and apatite cements was fully characterised. Measurement of the surface strains was done using a digital image correlation (DIC) technique, and compared to results obtained with the commonly used built-in displacement measurement of the materials testers. The collected data showed that the use of fixed compression platens, as opposed to spherically seated ones, may in some cases underestimate the compressive strength by up to 40%. Also, the built-in measurements may underestimate the elastic modulus by up to 62% as compared to DIC measurements. Using DIC, the brushite cement was found to be much stiffer (24.3 ± 2.3 GPa) than the apatite (13.5 ± 1.6 GPa) and monetite (7.1 ± 1.0 GPa) cements, and elastic moduli were inversely related to the porosity of the materials. Poisson's ratio was determined to be 0.26 ± 0.02 for brushite, 0.21 ± 0.02 for apatite and 0.20 ± 0.03 for monetite. All investigated CPCs showed low strain-to-crack-initiation (0.17–0.19%). In summary, the elastic modulus of CPCs is substantially higher than previously reported and it is concluded that an accurate procedure is a prerequisite in order to properly compare the mechanical properties of different CPC formulations. It is recommended to use spherically seated platens and measuring the strain at a relevant resolution and on the specimen surface.Peer ReviewedElsevier20172017-10-0120172017-09-22journal articlehttp://purl.org/coar/resource_type/c_6501AOhttp://purl.org/coar/version/c_b1a7d7d4d402bcceinfo:eu-repo/semantics/articleapplication/pdfhttps://hdl.handle.net/2117/107887https://dx.doi.org/10.1016/j.jmbbm.2017.06.023reponame:UPCommons. Portal del coneixement obert de la UPCinstname:Universitat Politècnica de Catalunya (UPC)Inglésengopen accesshttp://purl.org/coar/access_right/c_abf2info:eu-repo/semantics/openAccessoai:upcommons.upc.edu:2117/1078872026-05-27T15:37:01Z
dc.title.none.fl_str_mv Elastic properties and strain-to-crack-initiation of calcium phosphate bone cements: revelations of a high-resolution measurement technique
title Elastic properties and strain-to-crack-initiation of calcium phosphate bone cements: revelations of a high-resolution measurement technique
spellingShingle Elastic properties and strain-to-crack-initiation of calcium phosphate bone cements: revelations of a high-resolution measurement technique
Ajaxon, Ingrid
Bone cements
Calcium phosphate
Apatite
Materials--Mechanical properties
Apatite
Bone cement
Brushite
Calcium phosphate
Elastic modulus
Mechanical properties
Monetite
Poisson's ratio
Materials -- Propietats mecàniques
Fosfat de calci
Àrees temàtiques de la UPC::Enginyeria dels materials
title_short Elastic properties and strain-to-crack-initiation of calcium phosphate bone cements: revelations of a high-resolution measurement technique
title_full Elastic properties and strain-to-crack-initiation of calcium phosphate bone cements: revelations of a high-resolution measurement technique
title_fullStr Elastic properties and strain-to-crack-initiation of calcium phosphate bone cements: revelations of a high-resolution measurement technique
title_full_unstemmed Elastic properties and strain-to-crack-initiation of calcium phosphate bone cements: revelations of a high-resolution measurement technique
title_sort Elastic properties and strain-to-crack-initiation of calcium phosphate bone cements: revelations of a high-resolution measurement technique
dc.creator.none.fl_str_mv Ajaxon, Ingrid
Acciaioli, A.
Lionello, G.
Ginebra Molins, Maria Pau|||0000-0002-4700-5621
Ohman, Caroline
Baleani, M.
Persson, Cecilia
author Ajaxon, Ingrid
author_facet Ajaxon, Ingrid
Acciaioli, A.
Lionello, G.
Ginebra Molins, Maria Pau|||0000-0002-4700-5621
Ohman, Caroline
Baleani, M.
Persson, Cecilia
author_role author
author2 Acciaioli, A.
Lionello, G.
Ginebra Molins, Maria Pau|||0000-0002-4700-5621
Ohman, Caroline
Baleani, M.
Persson, Cecilia
author2_role author
author
author
author
author
author
dc.subject.none.fl_str_mv Bone cements
Calcium phosphate
Apatite
Materials--Mechanical properties
Apatite
Bone cement
Brushite
Calcium phosphate
Elastic modulus
Mechanical properties
Monetite
Poisson's ratio
Materials -- Propietats mecàniques
Fosfat de calci
Àrees temàtiques de la UPC::Enginyeria dels materials
topic Bone cements
Calcium phosphate
Apatite
Materials--Mechanical properties
Apatite
Bone cement
Brushite
Calcium phosphate
Elastic modulus
Mechanical properties
Monetite
Poisson's ratio
Materials -- Propietats mecàniques
Fosfat de calci
Àrees temàtiques de la UPC::Enginyeria dels materials
description Calcium phosphate cements (CPCs) should ideally have mechanical properties similar to those of the bone tissue the material is used to replace or repair. Usually, the compressive strength of the CPCs is reported and, more rarely, the elastic modulus. Conversely, scarce or no data are available on Poisson's ratio and strain-to-crack-initiation. This is unfortunate, as data on the elastic response is key to, e.g., numerical model accuracy. In this study, the compressive behaviour of brushite, monetite and apatite cements was fully characterised. Measurement of the surface strains was done using a digital image correlation (DIC) technique, and compared to results obtained with the commonly used built-in displacement measurement of the materials testers. The collected data showed that the use of fixed compression platens, as opposed to spherically seated ones, may in some cases underestimate the compressive strength by up to 40%. Also, the built-in measurements may underestimate the elastic modulus by up to 62% as compared to DIC measurements. Using DIC, the brushite cement was found to be much stiffer (24.3 ± 2.3 GPa) than the apatite (13.5 ± 1.6 GPa) and monetite (7.1 ± 1.0 GPa) cements, and elastic moduli were inversely related to the porosity of the materials. Poisson's ratio was determined to be 0.26 ± 0.02 for brushite, 0.21 ± 0.02 for apatite and 0.20 ± 0.03 for monetite. All investigated CPCs showed low strain-to-crack-initiation (0.17–0.19%). In summary, the elastic modulus of CPCs is substantially higher than previously reported and it is concluded that an accurate procedure is a prerequisite in order to properly compare the mechanical properties of different CPC formulations. It is recommended to use spherically seated platens and measuring the strain at a relevant resolution and on the specimen surface.
publishDate 2017
dc.date.none.fl_str_mv 2017
2017-10-01
2017
2017-09-22
dc.type.none.fl_str_mv journal article
http://purl.org/coar/resource_type/c_6501
AO
http://purl.org/coar/version/c_b1a7d7d4d402bcce
dc.type.openaire.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv https://hdl.handle.net/2117/107887
https://dx.doi.org/10.1016/j.jmbbm.2017.06.023
url https://hdl.handle.net/2117/107887
https://dx.doi.org/10.1016/j.jmbbm.2017.06.023
dc.language.none.fl_str_mv Inglés
eng
language_invalid_str_mv Inglés
language eng
dc.rights.none.fl_str_mv open access
http://purl.org/coar/access_right/c_abf2
dc.rights.openaire.fl_str_mv info:eu-repo/semantics/openAccess
rights_invalid_str_mv open access
http://purl.org/coar/access_right/c_abf2
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Elsevier
publisher.none.fl_str_mv Elsevier
dc.source.none.fl_str_mv reponame:UPCommons. Portal del coneixement obert de la UPC
instname:Universitat Politècnica de Catalunya (UPC)
instname_str Universitat Politècnica de Catalunya (UPC)
reponame_str UPCommons. Portal del coneixement obert de la UPC
collection UPCommons. Portal del coneixement obert de la UPC
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15.300719

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