Influence of heat-treatment protocols on mechanical behavior of lithium silicate dental ceramics

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dc.contributor.authorAlves, Manuel Fellipe Rodrigues Pais
dc.contributor.authorSimba, Bruno Galvão [UNESP]
dc.contributor.authorde Campos, Leonardo Queiroz Bueno
dc.contributor.authorFerreira, Iago
dc.contributor.authordos Santos, Claudinei
dc.contributor.institutionUniversidade do Estado do Rio de Janeiro (UERJ)
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.date.accessioned2019-10-06T15:43:48Z
dc.date.available2019-10-06T15:43:48Z
dc.date.issued2019-01-01
dc.description.abstractIn this work, three different commercial lithium silicate (LS) glass-ceramics for computer aided design/computer aided machining systems, CeltraDuo-Dentsply (LS-C), E-MaxCAD-Ivoclar (LS-E), and Suprinity-Vita (LS-S), were comparatively characterized. Following the protocols recommended by the manufacturers, the glass-ceramics were heat-treated under low vacuum and characterized by X-ray diffraction, scanning electron microscopy, hardness, fracture toughness, Young's modulus, and flexural strength. Rietveld refinement indicated that the materials “as-received” present mostly amorphous phase and Li2SiO3 as secondary crystalline phase in LS-E and LS-S specimens, while LS-C specimens also present Li2Si2O5 and Li3PO4 as crystalline phases. All “as-received” glass-ceramics present hardness, fracture toughness, and Young's modulus of around 647-678 HV, 1.15-1.40 MPa.m1/2, and 82-92 GPa, respectively. After heat treatment, the LS-C and LS-S specimens presented decreasing of amorphous phase associated to Li2SiO3 and Li2Si2O5 grains with low aspect ratio, while LS-E indicates a reduction of amorphous phase and Li2Si2O5 elongated grains. Fracture toughness and Young's modulus increase about 10% due to the crystallization of residual amorphous phase for all materials. Moreover, crystallographic and microstructural characteristics are responsible for the higher flexural strength of LS-E (327 MPa), regarding LS-C and LS-S. However, the glass-ceramics LS-E present lower Weibull modulus (m = 5.4) comparatively to LS-C (m = 9) and LS-S (m = 6).en
dc.description.affiliationDepartamento de Mecânica e Energia Universidade do Estado do Rio de Janeiro-Faculdade de Tecnologia de Resende UERJ-FAT
dc.description.affiliationUniversidade Estadual Paulista - Faculdade de Engenharia de Guaratinguetá UNESP/FEG
dc.description.affiliationUnespUniversidade Estadual Paulista - Faculdade de Engenharia de Guaratinguetá UNESP/FEG
dc.description.sponsorshipConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.description.sponsorshipFundação de Amparo à Pesquisa do Estado do Rio de Janeiro (FAPERJ)
dc.description.sponsorshipIdCNPq: 132136/2018-0
dc.description.sponsorshipIdCNPq: 311119/2017-4
dc.description.sponsorshipIdFAPERJ: E26-201.476/2014
dc.format.extent1920-1931
dc.identifierhttp://dx.doi.org/10.1111/ijac.13257
dc.identifier.citationInternational Journal of Applied Ceramic Technology, v. 16, n. 5, p. 1920-1931, 2019.
dc.identifier.doi10.1111/ijac.13257
dc.identifier.issn1744-7402
dc.identifier.issn1546-542X
dc.identifier.scopus2-s2.0-85065827950
dc.identifier.urihttp://hdl.handle.net/11449/187674
dc.language.isoeng
dc.relation.ispartofInternational Journal of Applied Ceramic Technology
dc.rights.accessRightsAcesso restrito
dc.sourceScopus
dc.subjectcrystallization
dc.subjectdental glass-ceramics
dc.subjectheat treatment
dc.subjectmechanical properties
dc.subjectmicrostructure
dc.titleInfluence of heat-treatment protocols on mechanical behavior of lithium silicate dental ceramicsen
dc.typeArtigo
unesp.author.orcid0000-0001-7671-5684[1]
unesp.author.orcid0000-0002-9398-0639[5]

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