Effects of porcelain thickness on the flexural strength and crack propagation in a bilayered zirconia system
Autor(a) principal: | |
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Data de Publicação: | 2017 |
Outros Autores: | , , , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Journal of applied oral science (Online) |
Texto Completo: | https://www.revistas.usp.br/jaos/article/view/140026 |
Resumo: | Objective: This study evaluated the influence of porcelain (VM9, VITA Zahnfabrik, Germany) thickness on the flexural strength and crack propagation in bilayered zirconia systems (YZ, VITA Zahnfabrik, Germany). Material and Methods: Thirty zirconia bars (20.0x4.0x1.0 mm) and six zirconia blocks (12.0x7.5x1.2 mm) were prepared and veneered with porcelain with different thickness: 1 mm, 2 mm, or 3 mm. The bars of each experimental group (n=10) were subjected to four-point flexural strength testing. In each ceramic block, a Vickers indentation was created under a load of 10 kgf for 10 seconds, for the propagation of cracks. Results: The results of flexural strength were evaluated by One-way ANOVA and Tukey's test, with a significance level of 5%. The factor “thickness of the porcelain” was statistically significant (p=0.001) and the l-mm group presented the highest values of flexural strength. The cracks were predominant among the bending specimens with 1 and 2 mm of porcelain, and catastrophic failures were found in 50% of 3-mm-thick porcelain. After the indentation of blocks, the most severe defects were observed in blocks with 3-mm-thick porcelain. Conclusion: The smallest (1 mm) thickness of porcelain on the zirconia infrastructure presented higher values of flexural strength. Better resistance to defect propagation was observed near the porcelain/ zirconia interface for all groups. Higher flexural strength was found for a thinner porcelain layer in a bilayered zirconia system. The damage caused by a Vickers indentation near and far the interface with the zirconia shows that the stress profiles are different. |
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Journal of applied oral science (Online) |
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Effects of porcelain thickness on the flexural strength and crack propagation in a bilayered zirconia systemCeramicsPorcelainMechanical stressConfocal microscopy Objective: This study evaluated the influence of porcelain (VM9, VITA Zahnfabrik, Germany) thickness on the flexural strength and crack propagation in bilayered zirconia systems (YZ, VITA Zahnfabrik, Germany). Material and Methods: Thirty zirconia bars (20.0x4.0x1.0 mm) and six zirconia blocks (12.0x7.5x1.2 mm) were prepared and veneered with porcelain with different thickness: 1 mm, 2 mm, or 3 mm. The bars of each experimental group (n=10) were subjected to four-point flexural strength testing. In each ceramic block, a Vickers indentation was created under a load of 10 kgf for 10 seconds, for the propagation of cracks. Results: The results of flexural strength were evaluated by One-way ANOVA and Tukey's test, with a significance level of 5%. The factor “thickness of the porcelain” was statistically significant (p=0.001) and the l-mm group presented the highest values of flexural strength. The cracks were predominant among the bending specimens with 1 and 2 mm of porcelain, and catastrophic failures were found in 50% of 3-mm-thick porcelain. After the indentation of blocks, the most severe defects were observed in blocks with 3-mm-thick porcelain. Conclusion: The smallest (1 mm) thickness of porcelain on the zirconia infrastructure presented higher values of flexural strength. Better resistance to defect propagation was observed near the porcelain/ zirconia interface for all groups. Higher flexural strength was found for a thinner porcelain layer in a bilayered zirconia system. The damage caused by a Vickers indentation near and far the interface with the zirconia shows that the stress profiles are different.Universidade de São Paulo. Faculdade de Odontologia de Bauru2017-10-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttps://www.revistas.usp.br/jaos/article/view/14002610.1590/1678-7757-2015-0479Journal of Applied Oral Science; Vol. 25 No. 5 (2017); 566-574Journal of Applied Oral Science; Vol. 25 Núm. 5 (2017); 566-574Journal of Applied Oral Science; v. 25 n. 5 (2017); 566-5741678-77651678-7757reponame:Journal of applied oral science (Online)instname:Universidade de São Paulo (USP)instacron:USPenghttps://www.revistas.usp.br/jaos/article/view/140026/135226Copyright (c) 2017 Journal of Applied Oral Scienceinfo:eu-repo/semantics/openAccessFigueiredo, Viviane Maria Gonçalves dePereira, Sarina Maciel BragaBressiani, EduardoValera, Márcia CarneiroBottino, Marco AntônioZhang, YuMelo, Renata Marques de2017-10-25T11:51:34Zoai:revistas.usp.br:article/140026Revistahttp://www.scielo.br/jaosPUBhttps://www.revistas.usp.br/jaos/oai||jaos@usp.br1678-77651678-7757opendoar:2017-10-25T11:51:34Journal of applied oral science (Online) - Universidade de São Paulo (USP)false |
dc.title.none.fl_str_mv |
Effects of porcelain thickness on the flexural strength and crack propagation in a bilayered zirconia system |
title |
Effects of porcelain thickness on the flexural strength and crack propagation in a bilayered zirconia system |
spellingShingle |
Effects of porcelain thickness on the flexural strength and crack propagation in a bilayered zirconia system Figueiredo, Viviane Maria Gonçalves de Ceramics Porcelain Mechanical stress Confocal microscopy |
title_short |
Effects of porcelain thickness on the flexural strength and crack propagation in a bilayered zirconia system |
title_full |
Effects of porcelain thickness on the flexural strength and crack propagation in a bilayered zirconia system |
title_fullStr |
Effects of porcelain thickness on the flexural strength and crack propagation in a bilayered zirconia system |
title_full_unstemmed |
Effects of porcelain thickness on the flexural strength and crack propagation in a bilayered zirconia system |
title_sort |
Effects of porcelain thickness on the flexural strength and crack propagation in a bilayered zirconia system |
author |
Figueiredo, Viviane Maria Gonçalves de |
author_facet |
Figueiredo, Viviane Maria Gonçalves de Pereira, Sarina Maciel Braga Bressiani, Eduardo Valera, Márcia Carneiro Bottino, Marco Antônio Zhang, Yu Melo, Renata Marques de |
author_role |
author |
author2 |
Pereira, Sarina Maciel Braga Bressiani, Eduardo Valera, Márcia Carneiro Bottino, Marco Antônio Zhang, Yu Melo, Renata Marques de |
author2_role |
author author author author author author |
dc.contributor.author.fl_str_mv |
Figueiredo, Viviane Maria Gonçalves de Pereira, Sarina Maciel Braga Bressiani, Eduardo Valera, Márcia Carneiro Bottino, Marco Antônio Zhang, Yu Melo, Renata Marques de |
dc.subject.por.fl_str_mv |
Ceramics Porcelain Mechanical stress Confocal microscopy |
topic |
Ceramics Porcelain Mechanical stress Confocal microscopy |
description |
Objective: This study evaluated the influence of porcelain (VM9, VITA Zahnfabrik, Germany) thickness on the flexural strength and crack propagation in bilayered zirconia systems (YZ, VITA Zahnfabrik, Germany). Material and Methods: Thirty zirconia bars (20.0x4.0x1.0 mm) and six zirconia blocks (12.0x7.5x1.2 mm) were prepared and veneered with porcelain with different thickness: 1 mm, 2 mm, or 3 mm. The bars of each experimental group (n=10) were subjected to four-point flexural strength testing. In each ceramic block, a Vickers indentation was created under a load of 10 kgf for 10 seconds, for the propagation of cracks. Results: The results of flexural strength were evaluated by One-way ANOVA and Tukey's test, with a significance level of 5%. The factor “thickness of the porcelain” was statistically significant (p=0.001) and the l-mm group presented the highest values of flexural strength. The cracks were predominant among the bending specimens with 1 and 2 mm of porcelain, and catastrophic failures were found in 50% of 3-mm-thick porcelain. After the indentation of blocks, the most severe defects were observed in blocks with 3-mm-thick porcelain. Conclusion: The smallest (1 mm) thickness of porcelain on the zirconia infrastructure presented higher values of flexural strength. Better resistance to defect propagation was observed near the porcelain/ zirconia interface for all groups. Higher flexural strength was found for a thinner porcelain layer in a bilayered zirconia system. The damage caused by a Vickers indentation near and far the interface with the zirconia shows that the stress profiles are different. |
publishDate |
2017 |
dc.date.none.fl_str_mv |
2017-10-01 |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
https://www.revistas.usp.br/jaos/article/view/140026 10.1590/1678-7757-2015-0479 |
url |
https://www.revistas.usp.br/jaos/article/view/140026 |
identifier_str_mv |
10.1590/1678-7757-2015-0479 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
https://www.revistas.usp.br/jaos/article/view/140026/135226 |
dc.rights.driver.fl_str_mv |
Copyright (c) 2017 Journal of Applied Oral Science info:eu-repo/semantics/openAccess |
rights_invalid_str_mv |
Copyright (c) 2017 Journal of Applied Oral Science |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf |
dc.publisher.none.fl_str_mv |
Universidade de São Paulo. Faculdade de Odontologia de Bauru |
publisher.none.fl_str_mv |
Universidade de São Paulo. Faculdade de Odontologia de Bauru |
dc.source.none.fl_str_mv |
Journal of Applied Oral Science; Vol. 25 No. 5 (2017); 566-574 Journal of Applied Oral Science; Vol. 25 Núm. 5 (2017); 566-574 Journal of Applied Oral Science; v. 25 n. 5 (2017); 566-574 1678-7765 1678-7757 reponame:Journal of applied oral science (Online) instname:Universidade de São Paulo (USP) instacron:USP |
instname_str |
Universidade de São Paulo (USP) |
instacron_str |
USP |
institution |
USP |
reponame_str |
Journal of applied oral science (Online) |
collection |
Journal of applied oral science (Online) |
repository.name.fl_str_mv |
Journal of applied oral science (Online) - Universidade de São Paulo (USP) |
repository.mail.fl_str_mv |
||jaos@usp.br |
_version_ |
1800221680441753600 |