Crown fracture: Failure load, stress distribution, and fractographic analysis

Detalhes bibliográficos
Autor(a) principal: Campos, Roberto E.
Data de Publicação: 2015
Outros Autores: Soares, Paulo V., Versluis, Antheunis, Junior, Osmir Batista de O. [UNESP], Ambrosano, Glaucia M. B., Nunes, Isabella Ferola
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Institucional da UNESP
Texto Completo: http://dx.doi.org/10.1016/j.prosdent.2015.02.023
http://hdl.handle.net/11449/158495
Resumo: Statement of problem. The outcomes from load-to-failure tests may not be applicable to clinical situations. Purpose. The purpose of this study was to critically evaluate the efficacy of load-to-failure tests in the investigation of the fracture load and pattern of metal-free crowns. Material and methods. Four groups were formed from 128 bovine roots restored with metal posts, resin cores, and feldspathic, leucite, or lithium disilicate ceramic systems or polymer crowns. Each group was divided into 4 (n=8) according to the cement: zinc phosphate, self-adhesive resin, autopolymerizing resin, and glass ionomer. Mean fracture loads from compressive tests were submitted to ANOVA and Tukey HSD test. Finite element and fractographic analyses were performed and associated with the fracture load and pattern. Results. Significantly higher fracture load values were obtained for the lithium disilicate ceramic, but finite element and fractographic analyses showed that the cement effect could not be determined. The finite element analysis showed the cement likely affected the fracture pattern, confirmed that stresses in the cements were little affected by the crown materials, and found that the stressed conditions were lowest in the lithium disilicate compared with other crowns for all cement combinations. The stressed conditions in the crowns depended more on the adhesive properties than on the elastic modulus of the cement materials. The level of the stressed condition in the crowns at the occlusal surface was about the same or higher than along their cement interface, consistent with the fractography, which indicated fractures starting at the load point. Higher stress levels in the crowns corresponded with a lower number of catastrophic fractures, and higher stresses in the cements seemed to reduce the number of catastrophic fracture patterns. The highest stressed conditions occurred along the occlusal surface for crown materials with a low elastic modulus or in combination with adhesive cements. Conclusions. The method used was not appropriate either for investigating the crowns' fracture load and pattern or for stating the role of the cements within the crown-cement-tooth interaction.
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spelling Crown fracture: Failure load, stress distribution, and fractographic analysisStatement of problem. The outcomes from load-to-failure tests may not be applicable to clinical situations. Purpose. The purpose of this study was to critically evaluate the efficacy of load-to-failure tests in the investigation of the fracture load and pattern of metal-free crowns. Material and methods. Four groups were formed from 128 bovine roots restored with metal posts, resin cores, and feldspathic, leucite, or lithium disilicate ceramic systems or polymer crowns. Each group was divided into 4 (n=8) according to the cement: zinc phosphate, self-adhesive resin, autopolymerizing resin, and glass ionomer. Mean fracture loads from compressive tests were submitted to ANOVA and Tukey HSD test. Finite element and fractographic analyses were performed and associated with the fracture load and pattern. Results. Significantly higher fracture load values were obtained for the lithium disilicate ceramic, but finite element and fractographic analyses showed that the cement effect could not be determined. The finite element analysis showed the cement likely affected the fracture pattern, confirmed that stresses in the cements were little affected by the crown materials, and found that the stressed conditions were lowest in the lithium disilicate compared with other crowns for all cement combinations. The stressed conditions in the crowns depended more on the adhesive properties than on the elastic modulus of the cement materials. The level of the stressed condition in the crowns at the occlusal surface was about the same or higher than along their cement interface, consistent with the fractography, which indicated fractures starting at the load point. Higher stress levels in the crowns corresponded with a lower number of catastrophic fractures, and higher stresses in the cements seemed to reduce the number of catastrophic fracture patterns. The highest stressed conditions occurred along the occlusal surface for crown materials with a low elastic modulus or in combination with adhesive cements. Conclusions. The method used was not appropriate either for investigating the crowns' fracture load and pattern or for stating the role of the cements within the crown-cement-tooth interaction.Fundação de Amparo à Pesquisa do Estado de Minas Gerais (FAPEMIG)Univ Fed Uberlandia, Sch Dent, BR-38405320 Uberlandia, MG, BrazilUniv Tennessee, Ctr Hlth Sci, Coll Dent, Dept Biosci Res, Memphis, TN 38163 USAState Univ Sao Paulo, Araraquara Sch Dent, Sao Paulo, BrazilUniv Estadual Campinas, Piracicaba Sch Dent, Campinas, BrazilState Univ Sao Paulo, Araraquara Sch Dent, Sao Paulo, BrazilElsevier B.V.Universidade Federal de Uberlândia (UFU)Univ TennesseeUniversidade Estadual Paulista (Unesp)Universidade Estadual de Campinas (UNICAMP)Campos, Roberto E.Soares, Paulo V.Versluis, AntheunisJunior, Osmir Batista de O. [UNESP]Ambrosano, Glaucia M. B.Nunes, Isabella Ferola2018-11-26T15:27:53Z2018-11-26T15:27:53Z2015-09-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article447-455application/pdfhttp://dx.doi.org/10.1016/j.prosdent.2015.02.023Journal Of Prosthetic Dentistry. New York: Mosby-elsevier, v. 114, n. 3, p. 447-455, 2015.0022-3913http://hdl.handle.net/11449/15849510.1016/j.prosdent.2015.02.023WOS:000361268900024WOS000361268900024.pdfWeb of Sciencereponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengJournal Of Prosthetic Dentistry1,087info:eu-repo/semantics/openAccess2023-12-11T06:16:32Zoai:repositorio.unesp.br:11449/158495Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-08-05T20:02:39.231155Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false
dc.title.none.fl_str_mv Crown fracture: Failure load, stress distribution, and fractographic analysis
title Crown fracture: Failure load, stress distribution, and fractographic analysis
spellingShingle Crown fracture: Failure load, stress distribution, and fractographic analysis
Campos, Roberto E.
title_short Crown fracture: Failure load, stress distribution, and fractographic analysis
title_full Crown fracture: Failure load, stress distribution, and fractographic analysis
title_fullStr Crown fracture: Failure load, stress distribution, and fractographic analysis
title_full_unstemmed Crown fracture: Failure load, stress distribution, and fractographic analysis
title_sort Crown fracture: Failure load, stress distribution, and fractographic analysis
author Campos, Roberto E.
author_facet Campos, Roberto E.
Soares, Paulo V.
Versluis, Antheunis
Junior, Osmir Batista de O. [UNESP]
Ambrosano, Glaucia M. B.
Nunes, Isabella Ferola
author_role author
author2 Soares, Paulo V.
Versluis, Antheunis
Junior, Osmir Batista de O. [UNESP]
Ambrosano, Glaucia M. B.
Nunes, Isabella Ferola
author2_role author
author
author
author
author
dc.contributor.none.fl_str_mv Universidade Federal de Uberlândia (UFU)
Univ Tennessee
Universidade Estadual Paulista (Unesp)
Universidade Estadual de Campinas (UNICAMP)
dc.contributor.author.fl_str_mv Campos, Roberto E.
Soares, Paulo V.
Versluis, Antheunis
Junior, Osmir Batista de O. [UNESP]
Ambrosano, Glaucia M. B.
Nunes, Isabella Ferola
description Statement of problem. The outcomes from load-to-failure tests may not be applicable to clinical situations. Purpose. The purpose of this study was to critically evaluate the efficacy of load-to-failure tests in the investigation of the fracture load and pattern of metal-free crowns. Material and methods. Four groups were formed from 128 bovine roots restored with metal posts, resin cores, and feldspathic, leucite, or lithium disilicate ceramic systems or polymer crowns. Each group was divided into 4 (n=8) according to the cement: zinc phosphate, self-adhesive resin, autopolymerizing resin, and glass ionomer. Mean fracture loads from compressive tests were submitted to ANOVA and Tukey HSD test. Finite element and fractographic analyses were performed and associated with the fracture load and pattern. Results. Significantly higher fracture load values were obtained for the lithium disilicate ceramic, but finite element and fractographic analyses showed that the cement effect could not be determined. The finite element analysis showed the cement likely affected the fracture pattern, confirmed that stresses in the cements were little affected by the crown materials, and found that the stressed conditions were lowest in the lithium disilicate compared with other crowns for all cement combinations. The stressed conditions in the crowns depended more on the adhesive properties than on the elastic modulus of the cement materials. The level of the stressed condition in the crowns at the occlusal surface was about the same or higher than along their cement interface, consistent with the fractography, which indicated fractures starting at the load point. Higher stress levels in the crowns corresponded with a lower number of catastrophic fractures, and higher stresses in the cements seemed to reduce the number of catastrophic fracture patterns. The highest stressed conditions occurred along the occlusal surface for crown materials with a low elastic modulus or in combination with adhesive cements. Conclusions. The method used was not appropriate either for investigating the crowns' fracture load and pattern or for stating the role of the cements within the crown-cement-tooth interaction.
publishDate 2015
dc.date.none.fl_str_mv 2015-09-01
2018-11-26T15:27:53Z
2018-11-26T15:27:53Z
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://dx.doi.org/10.1016/j.prosdent.2015.02.023
Journal Of Prosthetic Dentistry. New York: Mosby-elsevier, v. 114, n. 3, p. 447-455, 2015.
0022-3913
http://hdl.handle.net/11449/158495
10.1016/j.prosdent.2015.02.023
WOS:000361268900024
WOS000361268900024.pdf
url http://dx.doi.org/10.1016/j.prosdent.2015.02.023
http://hdl.handle.net/11449/158495
identifier_str_mv Journal Of Prosthetic Dentistry. New York: Mosby-elsevier, v. 114, n. 3, p. 447-455, 2015.
0022-3913
10.1016/j.prosdent.2015.02.023
WOS:000361268900024
WOS000361268900024.pdf
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv Journal Of Prosthetic Dentistry
1,087
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv 447-455
application/pdf
dc.publisher.none.fl_str_mv Elsevier B.V.
publisher.none.fl_str_mv Elsevier B.V.
dc.source.none.fl_str_mv Web of Science
reponame:Repositório Institucional da UNESP
instname:Universidade Estadual Paulista (UNESP)
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instname_str Universidade Estadual Paulista (UNESP)
instacron_str UNESP
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reponame_str Repositório Institucional da UNESP
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repository.name.fl_str_mv Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)
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