Effect of repeated firings and staining on the mechanical behavior and composition of lithium disilicate
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.dental.2020.02.003 http://hdl.handle.net/11449/201549 |
Resumo: | Objective: To evaluate the composition, flexural strength and fatigue behaviour of lithium disilicate ceramic (LD) after repeated firings and different staining techniques. Methods: LD discs were fabricated and divided according to number of firing cycles and staining technique: CO - control, discs were crystallized (850 °C/10 min); SC – single-step characterization – crystallization and staining (applied with a thin brush) were performed in a single step with one firing cycle (850 °C/10 min); and DC – double-step characterization – crystallization firing cycle was performed first (850 °C/10 min), followed by staining firing cycle (770 °C/90 s). Specimens were fired two, four or six times (one crystallization firing cycle and one, three or five staining firing cycles), resulting into 9 groups (n = 30): COII, COIV, COVI, SCII, SCIV, SCVI, DCII, DCIV and DCVI. The composition of the specimens was investigated (EDS, XRD, Raman spectroscopy), and the biaxial flexural strength (n = 10) and staircase tests (n = 20, 5 × 104 cycles, 5 Hz) were performed. Data were subjected to one-way ANOVA and Tukey's test (α = 0.05). Results: EDS and XRD revealed amorphous content for stained groups. Biaxial flexural strength was not affected by repeated firings in any group, but stained groups presented lower flexural strength than control groups (p = 0.001). The fatigue limit results decreased in all groups compared to flexural strength. SC groups showed similar (SCII and SCIV) or even higher fatigue limits (SCVI) than the control groups, and DC showed the lowest fatigue limit values. SEM and Raman suggested that the interfaces between staining and the LD showed only an overlap for the DC groups, whereas for the SC it was suggested an interaction between the stain and the LD. Significance: Repeated firings did not result in decreased lithium disilicate flexural strength.Staining affected flexural strength and also resulted in increased amorphous content in the characterized specimens. Single-step staining resulted in the highest fatigue limit. |
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Effect of repeated firings and staining on the mechanical behavior and composition of lithium disilicateGlass ceramicLithium disilicateMechanical behaviorStaircase methodObjective: To evaluate the composition, flexural strength and fatigue behaviour of lithium disilicate ceramic (LD) after repeated firings and different staining techniques. Methods: LD discs were fabricated and divided according to number of firing cycles and staining technique: CO - control, discs were crystallized (850 °C/10 min); SC – single-step characterization – crystallization and staining (applied with a thin brush) were performed in a single step with one firing cycle (850 °C/10 min); and DC – double-step characterization – crystallization firing cycle was performed first (850 °C/10 min), followed by staining firing cycle (770 °C/90 s). Specimens were fired two, four or six times (one crystallization firing cycle and one, three or five staining firing cycles), resulting into 9 groups (n = 30): COII, COIV, COVI, SCII, SCIV, SCVI, DCII, DCIV and DCVI. The composition of the specimens was investigated (EDS, XRD, Raman spectroscopy), and the biaxial flexural strength (n = 10) and staircase tests (n = 20, 5 × 104 cycles, 5 Hz) were performed. Data were subjected to one-way ANOVA and Tukey's test (α = 0.05). Results: EDS and XRD revealed amorphous content for stained groups. Biaxial flexural strength was not affected by repeated firings in any group, but stained groups presented lower flexural strength than control groups (p = 0.001). The fatigue limit results decreased in all groups compared to flexural strength. SC groups showed similar (SCII and SCIV) or even higher fatigue limits (SCVI) than the control groups, and DC showed the lowest fatigue limit values. SEM and Raman suggested that the interfaces between staining and the LD showed only an overlap for the DC groups, whereas for the SC it was suggested an interaction between the stain and the LD. Significance: Repeated firings did not result in decreased lithium disilicate flexural strength.Staining affected flexural strength and also resulted in increased amorphous content in the characterized specimens. Single-step staining resulted in the highest fatigue limit.Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Institute of Science and Technology UNESP – Paulista State University São José dos CamposTechnological Institute of Aeronautics São José dos CamposDental School University of São PauloDepartment of Dentistry University of TaubatéInstitute of Science and Technology UNESP – Paulista State University São José dos CamposFAPESP: 2017-11913-8Universidade Estadual Paulista (Unesp)São José dos CamposUniversidade de São Paulo (USP)University of TaubatéMiranda, Jean Soares [UNESP]Barcellos, Aline Serrado de Pinho [UNESP]Campos, Tiago Moreira BastosCesar, Paulo FranciscoAmaral, MarinaKimpara, Estevão Tomomitsu [UNESP]2020-12-12T02:35:32Z2020-12-12T02:35:32Z2020-05-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articlee149-e157http://dx.doi.org/10.1016/j.dental.2020.02.003Dental Materials, v. 36, n. 5, p. e149-e157, 2020.0109-5641http://hdl.handle.net/11449/20154910.1016/j.dental.2020.02.0032-s2.0-85079268161Scopusreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengDental Materialsinfo:eu-repo/semantics/openAccess2021-10-22T20:18:50Zoai:repositorio.unesp.br:11449/201549Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-08-05T14:38:28.030711Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
dc.title.none.fl_str_mv |
Effect of repeated firings and staining on the mechanical behavior and composition of lithium disilicate |
title |
Effect of repeated firings and staining on the mechanical behavior and composition of lithium disilicate |
spellingShingle |
Effect of repeated firings and staining on the mechanical behavior and composition of lithium disilicate Miranda, Jean Soares [UNESP] Glass ceramic Lithium disilicate Mechanical behavior Staircase method |
title_short |
Effect of repeated firings and staining on the mechanical behavior and composition of lithium disilicate |
title_full |
Effect of repeated firings and staining on the mechanical behavior and composition of lithium disilicate |
title_fullStr |
Effect of repeated firings and staining on the mechanical behavior and composition of lithium disilicate |
title_full_unstemmed |
Effect of repeated firings and staining on the mechanical behavior and composition of lithium disilicate |
title_sort |
Effect of repeated firings and staining on the mechanical behavior and composition of lithium disilicate |
author |
Miranda, Jean Soares [UNESP] |
author_facet |
Miranda, Jean Soares [UNESP] Barcellos, Aline Serrado de Pinho [UNESP] Campos, Tiago Moreira Bastos Cesar, Paulo Francisco Amaral, Marina Kimpara, Estevão Tomomitsu [UNESP] |
author_role |
author |
author2 |
Barcellos, Aline Serrado de Pinho [UNESP] Campos, Tiago Moreira Bastos Cesar, Paulo Francisco Amaral, Marina Kimpara, Estevão Tomomitsu [UNESP] |
author2_role |
author author author author author |
dc.contributor.none.fl_str_mv |
Universidade Estadual Paulista (Unesp) São José dos Campos Universidade de São Paulo (USP) University of Taubaté |
dc.contributor.author.fl_str_mv |
Miranda, Jean Soares [UNESP] Barcellos, Aline Serrado de Pinho [UNESP] Campos, Tiago Moreira Bastos Cesar, Paulo Francisco Amaral, Marina Kimpara, Estevão Tomomitsu [UNESP] |
dc.subject.por.fl_str_mv |
Glass ceramic Lithium disilicate Mechanical behavior Staircase method |
topic |
Glass ceramic Lithium disilicate Mechanical behavior Staircase method |
description |
Objective: To evaluate the composition, flexural strength and fatigue behaviour of lithium disilicate ceramic (LD) after repeated firings and different staining techniques. Methods: LD discs were fabricated and divided according to number of firing cycles and staining technique: CO - control, discs were crystallized (850 °C/10 min); SC – single-step characterization – crystallization and staining (applied with a thin brush) were performed in a single step with one firing cycle (850 °C/10 min); and DC – double-step characterization – crystallization firing cycle was performed first (850 °C/10 min), followed by staining firing cycle (770 °C/90 s). Specimens were fired two, four or six times (one crystallization firing cycle and one, three or five staining firing cycles), resulting into 9 groups (n = 30): COII, COIV, COVI, SCII, SCIV, SCVI, DCII, DCIV and DCVI. The composition of the specimens was investigated (EDS, XRD, Raman spectroscopy), and the biaxial flexural strength (n = 10) and staircase tests (n = 20, 5 × 104 cycles, 5 Hz) were performed. Data were subjected to one-way ANOVA and Tukey's test (α = 0.05). Results: EDS and XRD revealed amorphous content for stained groups. Biaxial flexural strength was not affected by repeated firings in any group, but stained groups presented lower flexural strength than control groups (p = 0.001). The fatigue limit results decreased in all groups compared to flexural strength. SC groups showed similar (SCII and SCIV) or even higher fatigue limits (SCVI) than the control groups, and DC showed the lowest fatigue limit values. SEM and Raman suggested that the interfaces between staining and the LD showed only an overlap for the DC groups, whereas for the SC it was suggested an interaction between the stain and the LD. Significance: Repeated firings did not result in decreased lithium disilicate flexural strength.Staining affected flexural strength and also resulted in increased amorphous content in the characterized specimens. Single-step staining resulted in the highest fatigue limit. |
publishDate |
2020 |
dc.date.none.fl_str_mv |
2020-12-12T02:35:32Z 2020-12-12T02:35:32Z 2020-05-01 |
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.dental.2020.02.003 Dental Materials, v. 36, n. 5, p. e149-e157, 2020. 0109-5641 http://hdl.handle.net/11449/201549 10.1016/j.dental.2020.02.003 2-s2.0-85079268161 |
url |
http://dx.doi.org/10.1016/j.dental.2020.02.003 http://hdl.handle.net/11449/201549 |
identifier_str_mv |
Dental Materials, v. 36, n. 5, p. e149-e157, 2020. 0109-5641 10.1016/j.dental.2020.02.003 2-s2.0-85079268161 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Dental Materials |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
e149-e157 |
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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1808128393522184192 |