Degradation kinetics of high-translucency dental zirconias: Mechanical properties and in-depth analysis of phase transformation
Autor(a) principal: | |
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Data de Publicação: | 2020 |
Outros Autores: | , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UNESP |
Texto Completo: | http://dx.doi.org/10.1016/j.jmbbm.2019.103482 http://hdl.handle.net/11449/198032 |
Resumo: | This study aimed to evaluate the effects of low temperature degradation (LTD) on commercial dental zirconias (conventional and high-translucent - HT) with different microstructures, as well as on their mechanical properties and t-m phase transformation. The amount of monoclinic zirconia in different depths was quantified using X-ray diffraction (XRD) with different anode tubes (Cr, Co and Cu). XRD was also used to measure the residual stress of the materials at 0 h, 26 h and 140 h aging times. Vickers microhardness and biaxial flexural strength tests were performed. Data were subjected to two-way ANOVA and Tukey's post-hoc test, both with α = 0.05 for means comparisons. Weibull parameters were calculated and compared based on the overlapping of confidence intervals (CI = 95%). HT Zirconia presented smaller grain sizes and had a higher rate of t-m transformation over time. The microstructure of the conventional zirconia showed an expressive increase of the grain size and consequently greater morphological variation with the LTD. The non-aged samples (control) did not present any residual stress and the aged ones presented compression stress. All zirconia showed a residual stress increase with the increase of LTD time, but the conventional one showed a decrease after 140 h. HT zirconia showed no significant change in flexural strength over LTD time, but the conventional one showed a strength decrease after 140 h (681.78 ± 121.18 MPa). Vickers hardness decreased for all zirconia samples after 26 h. The mechanics of LTD is significantly altered in different zirconia microstructures. Zirconias with smaller grains are more prone to t-m phase transformation, but present lower variation of residual stress, while larger grains zirconias have a lower surface area and therefore a more pronounced increase in stress over LTD time. Stress values close to the maximum compression stress generates ejection of the zirconia grains, producing defects and causing reduction of the compression stress and consequently decrease of flexural strength. |
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Degradation kinetics of high-translucency dental zirconias: Mechanical properties and in-depth analysis of phase transformationBiaxial flexural strengthCeramicsDental materialsYttria stabilized tetragonal zirconiaThis study aimed to evaluate the effects of low temperature degradation (LTD) on commercial dental zirconias (conventional and high-translucent - HT) with different microstructures, as well as on their mechanical properties and t-m phase transformation. The amount of monoclinic zirconia in different depths was quantified using X-ray diffraction (XRD) with different anode tubes (Cr, Co and Cu). XRD was also used to measure the residual stress of the materials at 0 h, 26 h and 140 h aging times. Vickers microhardness and biaxial flexural strength tests were performed. Data were subjected to two-way ANOVA and Tukey's post-hoc test, both with α = 0.05 for means comparisons. Weibull parameters were calculated and compared based on the overlapping of confidence intervals (CI = 95%). HT Zirconia presented smaller grain sizes and had a higher rate of t-m transformation over time. The microstructure of the conventional zirconia showed an expressive increase of the grain size and consequently greater morphological variation with the LTD. The non-aged samples (control) did not present any residual stress and the aged ones presented compression stress. All zirconia showed a residual stress increase with the increase of LTD time, but the conventional one showed a decrease after 140 h. HT zirconia showed no significant change in flexural strength over LTD time, but the conventional one showed a strength decrease after 140 h (681.78 ± 121.18 MPa). Vickers hardness decreased for all zirconia samples after 26 h. The mechanics of LTD is significantly altered in different zirconia microstructures. Zirconias with smaller grains are more prone to t-m phase transformation, but present lower variation of residual stress, while larger grains zirconias have a lower surface area and therefore a more pronounced increase in stress over LTD time. Stress values close to the maximum compression stress generates ejection of the zirconia grains, producing defects and causing reduction of the compression stress and consequently decrease of flexural strength.Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Department of Dental Materials and Prosthodontics São Paulo State University (UNESP) Science and Technology InstitutePhysics Departament Aeronautics Technological Institute (ITA), 50 Marechal Eduardo Gomes SquareDepartment of Dental Materials and Prosthodontics São Paulo State University (UNESP) Institute of Science and TechnologyDepartment of Dental Materials and Prosthodontics São Paulo State University (UNESP) Science and Technology InstituteDepartment of Dental Materials and Prosthodontics São Paulo State University (UNESP) Institute of Science and TechnologyFAPESP: 2016/03688-1Universidade Estadual Paulista (Unesp)Aeronautics Technological Institute (ITA)Prado, Pedro Henrique Condé Oliveira [UNESP]Monteiro, Jaiane Bandoli [UNESP]Campos, Tiago Moreira BastosThim, Gilmar Patrocíniode Melo, Renata Marques [UNESP]2020-12-12T00:57:04Z2020-12-12T00:57:04Z2020-02-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articlehttp://dx.doi.org/10.1016/j.jmbbm.2019.103482Journal of the Mechanical Behavior of Biomedical Materials, v. 102.1878-01801751-6161http://hdl.handle.net/11449/19803210.1016/j.jmbbm.2019.1034822-s2.0-85073685207Scopusreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengJournal of the Mechanical Behavior of Biomedical Materialsinfo:eu-repo/semantics/openAccess2021-10-23T07:59:13Zoai:repositorio.unesp.br:11449/198032Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462021-10-23T07:59:13Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
dc.title.none.fl_str_mv |
Degradation kinetics of high-translucency dental zirconias: Mechanical properties and in-depth analysis of phase transformation |
title |
Degradation kinetics of high-translucency dental zirconias: Mechanical properties and in-depth analysis of phase transformation |
spellingShingle |
Degradation kinetics of high-translucency dental zirconias: Mechanical properties and in-depth analysis of phase transformation Prado, Pedro Henrique Condé Oliveira [UNESP] Biaxial flexural strength Ceramics Dental materials Yttria stabilized tetragonal zirconia |
title_short |
Degradation kinetics of high-translucency dental zirconias: Mechanical properties and in-depth analysis of phase transformation |
title_full |
Degradation kinetics of high-translucency dental zirconias: Mechanical properties and in-depth analysis of phase transformation |
title_fullStr |
Degradation kinetics of high-translucency dental zirconias: Mechanical properties and in-depth analysis of phase transformation |
title_full_unstemmed |
Degradation kinetics of high-translucency dental zirconias: Mechanical properties and in-depth analysis of phase transformation |
title_sort |
Degradation kinetics of high-translucency dental zirconias: Mechanical properties and in-depth analysis of phase transformation |
author |
Prado, Pedro Henrique Condé Oliveira [UNESP] |
author_facet |
Prado, Pedro Henrique Condé Oliveira [UNESP] Monteiro, Jaiane Bandoli [UNESP] Campos, Tiago Moreira Bastos Thim, Gilmar Patrocínio de Melo, Renata Marques [UNESP] |
author_role |
author |
author2 |
Monteiro, Jaiane Bandoli [UNESP] Campos, Tiago Moreira Bastos Thim, Gilmar Patrocínio de Melo, Renata Marques [UNESP] |
author2_role |
author author author author |
dc.contributor.none.fl_str_mv |
Universidade Estadual Paulista (Unesp) Aeronautics Technological Institute (ITA) |
dc.contributor.author.fl_str_mv |
Prado, Pedro Henrique Condé Oliveira [UNESP] Monteiro, Jaiane Bandoli [UNESP] Campos, Tiago Moreira Bastos Thim, Gilmar Patrocínio de Melo, Renata Marques [UNESP] |
dc.subject.por.fl_str_mv |
Biaxial flexural strength Ceramics Dental materials Yttria stabilized tetragonal zirconia |
topic |
Biaxial flexural strength Ceramics Dental materials Yttria stabilized tetragonal zirconia |
description |
This study aimed to evaluate the effects of low temperature degradation (LTD) on commercial dental zirconias (conventional and high-translucent - HT) with different microstructures, as well as on their mechanical properties and t-m phase transformation. The amount of monoclinic zirconia in different depths was quantified using X-ray diffraction (XRD) with different anode tubes (Cr, Co and Cu). XRD was also used to measure the residual stress of the materials at 0 h, 26 h and 140 h aging times. Vickers microhardness and biaxial flexural strength tests were performed. Data were subjected to two-way ANOVA and Tukey's post-hoc test, both with α = 0.05 for means comparisons. Weibull parameters were calculated and compared based on the overlapping of confidence intervals (CI = 95%). HT Zirconia presented smaller grain sizes and had a higher rate of t-m transformation over time. The microstructure of the conventional zirconia showed an expressive increase of the grain size and consequently greater morphological variation with the LTD. The non-aged samples (control) did not present any residual stress and the aged ones presented compression stress. All zirconia showed a residual stress increase with the increase of LTD time, but the conventional one showed a decrease after 140 h. HT zirconia showed no significant change in flexural strength over LTD time, but the conventional one showed a strength decrease after 140 h (681.78 ± 121.18 MPa). Vickers hardness decreased for all zirconia samples after 26 h. The mechanics of LTD is significantly altered in different zirconia microstructures. Zirconias with smaller grains are more prone to t-m phase transformation, but present lower variation of residual stress, while larger grains zirconias have a lower surface area and therefore a more pronounced increase in stress over LTD time. Stress values close to the maximum compression stress generates ejection of the zirconia grains, producing defects and causing reduction of the compression stress and consequently decrease of flexural strength. |
publishDate |
2020 |
dc.date.none.fl_str_mv |
2020-12-12T00:57:04Z 2020-12-12T00:57:04Z 2020-02-01 |
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.jmbbm.2019.103482 Journal of the Mechanical Behavior of Biomedical Materials, v. 102. 1878-0180 1751-6161 http://hdl.handle.net/11449/198032 10.1016/j.jmbbm.2019.103482 2-s2.0-85073685207 |
url |
http://dx.doi.org/10.1016/j.jmbbm.2019.103482 http://hdl.handle.net/11449/198032 |
identifier_str_mv |
Journal of the Mechanical Behavior of Biomedical Materials, v. 102. 1878-0180 1751-6161 10.1016/j.jmbbm.2019.103482 2-s2.0-85073685207 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Journal of the Mechanical Behavior of Biomedical Materials |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.source.none.fl_str_mv |
Scopus reponame:Repositório Institucional da UNESP instname:Universidade Estadual Paulista (UNESP) instacron:UNESP |
instname_str |
Universidade Estadual Paulista (UNESP) |
instacron_str |
UNESP |
institution |
UNESP |
reponame_str |
Repositório Institucional da UNESP |
collection |
Repositório Institucional da UNESP |
repository.name.fl_str_mv |
Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP) |
repository.mail.fl_str_mv |
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1797790190161362944 |