Comportamento mecânico de uma cerâmica Y-TZP após desgaste com broca diamantada e degradação hidrotérmica
Main Author: | |
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Publication Date: | 2016 |
Format: | Master thesis |
Language: | por |
Source: | Biblioteca Digital de Teses e Dissertações do UFSM |
Download full: | http://repositorio.ufsm.br/handle/1/6182 |
Summary: | This study aimed to determine the effects of grinding and low temperature aging on the surface micromorphology (roughness measurement, Scanning Electron Microscopy and Atomic Force Microscopy), phase transformation (t→m), biaxial flexural strength and structural reliability (Weibull analysis) of an yttrium-stabilized tetragonal zirconia polycrystalline ceramic. One hundred and eighty ceramic discs (15.0 × 1.2 ± 0.2 mm, VITA In-Ceram YZ) were prepared and randomly assigned into six groups according to 2 factors (n = 30): grinding (Ctrl without treatment, as-sintered; Xfine grinding with extra fine diamond bur - 30 μm; Coarse grinding by coarse diamond bur - 151 μm), and aging (without or with aging: CtrlLTD; XfineLTD; CoarseLTD). Grinding was performed in an oscillatory motion with a contra-angle handpiece under constant water-cooling. Low temperature degradation (LTD) was simulated in an autoclave at 134 °C, under 2 bar pressure, for 20 h. The roughness (Ra and Rz parameters) significantly increased after grinding in accordance with bur grit-size (Coarse > Xfine > Ctrl), and aging promoted distinct effects (Ctrl = CtrlLTD; Xfine > XfineLTD; Coarse = CoarseLTD). Grinding increased the m-phase, and aging led to an increase in the m-phase in all groups. However, different susceptibilities to LTD were observed. Weibull analysis showed a significant increase in the characteristic strength after grinding (Coarse = Xfine > Ctrl), while aging did not lead to any deleterious impact. Neither grinding nor aging resulted in any deleterious impact (no statistical decrease in the Weibull moduli) on material reliability. Thus, neither grinding nor aging led to a deleterious effect on the mechanical properties of the evaluated Y-TZP ceramic although a high m-phase content and roughness were observed. |
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2016-10-272016-10-272016-07-26GUILARDI, Luís Felipe. MECHANICAL BEHAVIOR OF A Y-TZP CERAMIC AFTER GRINDING WITH DIAMOND BUR AND HYDROTHERMAL DEGRADATION. 2016. 50 f. Dissertação (Mestrado em Odontologia) - Universidade Federal de Santa Maria, Santa Maria, 2016.http://repositorio.ufsm.br/handle/1/6182This study aimed to determine the effects of grinding and low temperature aging on the surface micromorphology (roughness measurement, Scanning Electron Microscopy and Atomic Force Microscopy), phase transformation (t→m), biaxial flexural strength and structural reliability (Weibull analysis) of an yttrium-stabilized tetragonal zirconia polycrystalline ceramic. One hundred and eighty ceramic discs (15.0 × 1.2 ± 0.2 mm, VITA In-Ceram YZ) were prepared and randomly assigned into six groups according to 2 factors (n = 30): grinding (Ctrl without treatment, as-sintered; Xfine grinding with extra fine diamond bur - 30 μm; Coarse grinding by coarse diamond bur - 151 μm), and aging (without or with aging: CtrlLTD; XfineLTD; CoarseLTD). Grinding was performed in an oscillatory motion with a contra-angle handpiece under constant water-cooling. Low temperature degradation (LTD) was simulated in an autoclave at 134 °C, under 2 bar pressure, for 20 h. The roughness (Ra and Rz parameters) significantly increased after grinding in accordance with bur grit-size (Coarse > Xfine > Ctrl), and aging promoted distinct effects (Ctrl = CtrlLTD; Xfine > XfineLTD; Coarse = CoarseLTD). Grinding increased the m-phase, and aging led to an increase in the m-phase in all groups. However, different susceptibilities to LTD were observed. Weibull analysis showed a significant increase in the characteristic strength after grinding (Coarse = Xfine > Ctrl), while aging did not lead to any deleterious impact. Neither grinding nor aging resulted in any deleterious impact (no statistical decrease in the Weibull moduli) on material reliability. Thus, neither grinding nor aging led to a deleterious effect on the mechanical properties of the evaluated Y-TZP ceramic although a high m-phase content and roughness were observed.Este estudo avaliou o efeito do desgaste com brocas diamantadas de diferentes granulações (Grossa G e Extrafina FF), associado ou não ao envelhecimento em autoclave (LTD) na micromorfologia superficial, na transformação de fase (tetragonal para monoclínica, t→m), e nas propriedades mecânicas de uma zircônia policristalina parcialmente estabilizada por óxido de ítrio. Foram confeccionados 180 discos (15,0 Ø x 1,2 mm de espessura) conforme a ISO 6872-2008, que foram divididos em 6 grupos (n=30) de acordo com dois fatores em estudo: desgaste da superfície (controle C - sem desgaste; desgaste com broca G ou FF); e envelhecimento em autoclave (CLTD, GLTD FFLTD); Os desgastes foram executados por um operador treinado sob refrigeração constante; e a LTD em autoclave a 134ºC, sob 2 bar de pressão, por 20 horas. Os resultados indicam que o envelhecimento em autoclave associado ou não ao desgaste não foram prejudiciais às propriedades mecânicas da zircônia. Entretanto cabe ressaltar que estes estímulos promoveram grande aumento de fase monoclínica, o que pode ser um indício de degradação do material. A análise de Weibull (Módulo de Weibull) demonstrou que os tratamentos avaliados (desgaste, envelhecimento em autoclave) não promoveram efeitos deletérios, não resultando em maior variabilidade da resistência mecânica. Logo, não há indícios de que os diferentes tratamentos realizados impactem negativamente na resistência à flexão biaxial da Y-TZP. Adicionalmente, nota-se que as superfícies desgastadas com brocas diamantadas têm uma menor susceptibilidade à LTD (menor aumento de fase m).application/pdfporUniversidade Federal de Santa MariaPrograma de Pós-Graduação em Ciências OdontológicasUFSMBROdontologiaDesgasteTratamento de superfícieDegradação hidrotérmicaAnálise de weibullCerâmica Y-TZPZircônia policristalina parcialmente estabilizada por óxido de ítrioGrindingHydrothermal degradationY-TZP ceramicsDental materialsSurface treatmentsYttrium-stabilized zirconium oxideCNPQ::CIENCIAS DA SAUDE::ODONTOLOGIAComportamento mecânico de uma cerâmica Y-TZP após desgaste com broca diamantada e degradação hidrotérmicaMechanical behavior of a Y-TZP ceramic after grinding with diamond bur and hydrothermal degradationinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesisValandro, Luiz Felipehttp://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4778035Y4Rippe, Marilia Pivettahttp://lattes.cnpq.br/3336921465345785Bergoli, César Dalmolinhttp://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4234332D1Guilardi, Luís Felipe400200000000400300300300300381d00c6-91f3-43f9-b2ff-a634b10ed95d3e5308a3-c40c-4e26-ac75-bb94dc0e3dd870e4857d-dc8b-42fe-8709-7ae2c47df6479b70de8d-eb7b-43f5-97fa-12237e0e3a0cinfo:eu-repo/semantics/openAccessreponame:Biblioteca Digital de Teses e Dissertações do UFSMinstname:Universidade Federal de Santa Maria (UFSM)instacron:UFSMORIGINALGUILARDI, LUIS FELIPE.pdfapplication/pdf2381409http://repositorio.ufsm.br/bitstream/1/6182/1/GUILARDI%2c%20LUIS%20FELIPE.pdfc2ef664ee4440b2e5b9c14e50e84a7d3MD51TEXTGUILARDI, LUIS FELIPE.pdf.txtGUILARDI, LUIS FELIPE.pdf.txtExtracted texttext/plain104721http://repositorio.ufsm.br/bitstream/1/6182/2/GUILARDI%2c%20LUIS%20FELIPE.pdf.txtd127ca39e7a90aa4c7c3920096fbea63MD52THUMBNAILGUILARDI, LUIS FELIPE.pdf.jpgGUILARDI, LUIS FELIPE.pdf.jpgIM Thumbnailimage/jpeg4466http://repositorio.ufsm.br/bitstream/1/6182/3/GUILARDI%2c%20LUIS%20FELIPE.pdf.jpg43ad2c14b086bf80b3cf5503e2764df9MD531/61822022-01-07 15:16:56.651oai:repositorio.ufsm.br:1/6182Biblioteca Digital de Teses e Dissertaçõeshttps://repositorio.ufsm.br/ONGhttps://repositorio.ufsm.br/oai/requestatendimento.sib@ufsm.br||tedebc@gmail.comopendoar:2022-01-07T18:16:56Biblioteca Digital de Teses e Dissertações do UFSM - Universidade Federal de Santa Maria (UFSM)false |
dc.title.por.fl_str_mv |
Comportamento mecânico de uma cerâmica Y-TZP após desgaste com broca diamantada e degradação hidrotérmica |
dc.title.alternative.eng.fl_str_mv |
Mechanical behavior of a Y-TZP ceramic after grinding with diamond bur and hydrothermal degradation |
title |
Comportamento mecânico de uma cerâmica Y-TZP após desgaste com broca diamantada e degradação hidrotérmica |
spellingShingle |
Comportamento mecânico de uma cerâmica Y-TZP após desgaste com broca diamantada e degradação hidrotérmica Guilardi, Luís Felipe Desgaste Tratamento de superfície Degradação hidrotérmica Análise de weibull Cerâmica Y-TZP Zircônia policristalina parcialmente estabilizada por óxido de ítrio Grinding Hydrothermal degradation Y-TZP ceramics Dental materials Surface treatments Yttrium-stabilized zirconium oxide CNPQ::CIENCIAS DA SAUDE::ODONTOLOGIA |
title_short |
Comportamento mecânico de uma cerâmica Y-TZP após desgaste com broca diamantada e degradação hidrotérmica |
title_full |
Comportamento mecânico de uma cerâmica Y-TZP após desgaste com broca diamantada e degradação hidrotérmica |
title_fullStr |
Comportamento mecânico de uma cerâmica Y-TZP após desgaste com broca diamantada e degradação hidrotérmica |
title_full_unstemmed |
Comportamento mecânico de uma cerâmica Y-TZP após desgaste com broca diamantada e degradação hidrotérmica |
title_sort |
Comportamento mecânico de uma cerâmica Y-TZP após desgaste com broca diamantada e degradação hidrotérmica |
author |
Guilardi, Luís Felipe |
author_facet |
Guilardi, Luís Felipe |
author_role |
author |
dc.contributor.advisor1.fl_str_mv |
Valandro, Luiz Felipe |
dc.contributor.advisor1Lattes.fl_str_mv |
http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4778035Y4 |
dc.contributor.referee1.fl_str_mv |
Rippe, Marilia Pivetta |
dc.contributor.referee1Lattes.fl_str_mv |
http://lattes.cnpq.br/3336921465345785 |
dc.contributor.referee2.fl_str_mv |
Bergoli, César Dalmolin |
dc.contributor.referee2Lattes.fl_str_mv |
http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4234332D1 |
dc.contributor.author.fl_str_mv |
Guilardi, Luís Felipe |
contributor_str_mv |
Valandro, Luiz Felipe Rippe, Marilia Pivetta Bergoli, César Dalmolin |
dc.subject.por.fl_str_mv |
Desgaste Tratamento de superfície Degradação hidrotérmica Análise de weibull Cerâmica Y-TZP Zircônia policristalina parcialmente estabilizada por óxido de ítrio |
topic |
Desgaste Tratamento de superfície Degradação hidrotérmica Análise de weibull Cerâmica Y-TZP Zircônia policristalina parcialmente estabilizada por óxido de ítrio Grinding Hydrothermal degradation Y-TZP ceramics Dental materials Surface treatments Yttrium-stabilized zirconium oxide CNPQ::CIENCIAS DA SAUDE::ODONTOLOGIA |
dc.subject.eng.fl_str_mv |
Grinding Hydrothermal degradation Y-TZP ceramics Dental materials Surface treatments Yttrium-stabilized zirconium oxide |
dc.subject.cnpq.fl_str_mv |
CNPQ::CIENCIAS DA SAUDE::ODONTOLOGIA |
description |
This study aimed to determine the effects of grinding and low temperature aging on the surface micromorphology (roughness measurement, Scanning Electron Microscopy and Atomic Force Microscopy), phase transformation (t→m), biaxial flexural strength and structural reliability (Weibull analysis) of an yttrium-stabilized tetragonal zirconia polycrystalline ceramic. One hundred and eighty ceramic discs (15.0 × 1.2 ± 0.2 mm, VITA In-Ceram YZ) were prepared and randomly assigned into six groups according to 2 factors (n = 30): grinding (Ctrl without treatment, as-sintered; Xfine grinding with extra fine diamond bur - 30 μm; Coarse grinding by coarse diamond bur - 151 μm), and aging (without or with aging: CtrlLTD; XfineLTD; CoarseLTD). Grinding was performed in an oscillatory motion with a contra-angle handpiece under constant water-cooling. Low temperature degradation (LTD) was simulated in an autoclave at 134 °C, under 2 bar pressure, for 20 h. The roughness (Ra and Rz parameters) significantly increased after grinding in accordance with bur grit-size (Coarse > Xfine > Ctrl), and aging promoted distinct effects (Ctrl = CtrlLTD; Xfine > XfineLTD; Coarse = CoarseLTD). Grinding increased the m-phase, and aging led to an increase in the m-phase in all groups. However, different susceptibilities to LTD were observed. Weibull analysis showed a significant increase in the characteristic strength after grinding (Coarse = Xfine > Ctrl), while aging did not lead to any deleterious impact. Neither grinding nor aging resulted in any deleterious impact (no statistical decrease in the Weibull moduli) on material reliability. Thus, neither grinding nor aging led to a deleterious effect on the mechanical properties of the evaluated Y-TZP ceramic although a high m-phase content and roughness were observed. |
publishDate |
2016 |
dc.date.accessioned.fl_str_mv |
2016-10-27 |
dc.date.available.fl_str_mv |
2016-10-27 |
dc.date.issued.fl_str_mv |
2016-07-26 |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/masterThesis |
format |
masterThesis |
status_str |
publishedVersion |
dc.identifier.citation.fl_str_mv |
GUILARDI, Luís Felipe. MECHANICAL BEHAVIOR OF A Y-TZP CERAMIC AFTER GRINDING WITH DIAMOND BUR AND HYDROTHERMAL DEGRADATION. 2016. 50 f. Dissertação (Mestrado em Odontologia) - Universidade Federal de Santa Maria, Santa Maria, 2016. |
dc.identifier.uri.fl_str_mv |
http://repositorio.ufsm.br/handle/1/6182 |
identifier_str_mv |
GUILARDI, Luís Felipe. MECHANICAL BEHAVIOR OF A Y-TZP CERAMIC AFTER GRINDING WITH DIAMOND BUR AND HYDROTHERMAL DEGRADATION. 2016. 50 f. Dissertação (Mestrado em Odontologia) - Universidade Federal de Santa Maria, Santa Maria, 2016. |
url |
http://repositorio.ufsm.br/handle/1/6182 |
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por |
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Universidade Federal de Santa Maria |
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UFSM |
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BR |
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Odontologia |
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Universidade Federal de Santa Maria |
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