Impact of diamond tool wear on the surface finish of lithium silicate glass ceramics machined with the assistance of CAD/CAM systems

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dc.contributor.authorSimba, Bruno Galvão [UNESP]
dc.contributor.authorAlves, Manuel Fellipe Rodrigues Pais
dc.contributor.authorVillela, Tales Ferreira
dc.contributor.authorRibeiro, Marcos Valério [UNESP]
dc.contributor.authorStrecker, Kurt
dc.contributor.authordos Santos, Claudinei
dc.contributor.institutionUniversidade Estadual Paulista (UNESP)
dc.contributor.institutionUniversidade do Estado do Rio de Janeiro (UERJ)
dc.contributor.institutionUniversidade Federal Fluminense (UFF)
dc.contributor.institutionUniversidade Federal de São João del-Rei
dc.date.accessioned2023-07-29T16:01:31Z
dc.date.available2023-07-29T16:01:31Z
dc.date.issued2023-01-01
dc.description.abstractIn this work, the effect of wear of diamond tools on the surface roughness and its influence on the mechanical properties of dental lithium silicate glass–ceramic milled by a CAD/CAM system was investigated. Cutting tools with distinct tool life, new cutting tool (NCT), mid-life cutting tool (MLCT) corresponding to cumulative 2 h of milling and end-of-life cutting tool (ELCT) corresponding to cumulative 4 h of milling were used for machining commercial lithium metasilicate LM, Li2SiO3, using a Sirona inLab MC X5® milling machine. The different tools were characterized by scanning electron microscopy (SEM). Their microstructure indicated a depletion of diamond particles on the surface, as a function of the accumulated time of use. The lithium metasilicate samples were characterized by their phase composition using X-ray diffraction (XRD) analysis and their microstructure by (SEM). Furthermore, the mechanical properties Vickers hardness, fracture toughness and the elastic parameters were determined. The as-received LM samples presented 44% of Li2SiO3 and 56% amorphous phase. These LM samples exhibited a Vickers hardness of 6.1 ± 0.3 GPa, a fracture toughness of 1.3 ± 0.2 MPa m1/2, a modulus of elasticity of 82.3 GPa and a Poisson’s ratio of 0.16. The surface roughness of the machined LM samples was evaluated using a roughness meter. The profilometry measurements of the machined LM samples indicate a slight increase in the roughness parameter Ra with increasing wear of the cutting tools, i.e., using NCT, MLCT or ELCT tools, in addition to a considerable increase in the total height of the Rt profile from 11 to 17 µm. The formation of small microcracks during machining may nucleate new flaws in the material, if the critical initial crack size is exceeded. Aspects related to the performance of heat treatments for crystallization of lithium disilicate, Li2Si2O5, and its implications on the microstructure, softening of the residual amorphous phase and its surface roughness are discussed.en
dc.description.affiliationFaculdade de Engenharia de Guaratinguetá Universidade Estadual Paulista UNESP/FEG, Av. Ariberto Pereira da Cunha, 333, Portal das Colinas, SP
dc.description.affiliationUniversidade do Estado do Rio de Janeiro - Faculdade de Tecnologia UERJ/FAT, Rodovia Presidente Dutra, Km 298, RJ
dc.description.affiliationUniversidade Federal Fluminense - Escola de Eng. Ind. Metalúrgica de Volta Redonda UFF/EEIMVR, Av. dos Trabalhadores, 420, Vila Santa Cecília, RJ
dc.description.affiliationDepartamento de Engenharia Mecânica e Produção Universidade Federal de São João del-Rei, MG
dc.description.affiliationUnespFaculdade de Engenharia de Guaratinguetá Universidade Estadual Paulista UNESP/FEG, Av. Ariberto Pereira da Cunha, 333, Portal das Colinas, SP
dc.description.sponsorshipFundação de Amparo à Pesquisa do Estado do Rio de Janeiro (FAPERJ)
dc.description.sponsorshipIdFAPERJ: E26-201.476/2014
dc.identifierhttp://dx.doi.org/10.1007/s40430-022-03952-7
dc.identifier.citationJournal of the Brazilian Society of Mechanical Sciences and Engineering, v. 45, n. 1, 2023.
dc.identifier.doi10.1007/s40430-022-03952-7
dc.identifier.issn1806-3691
dc.identifier.issn1678-5878
dc.identifier.scopus2-s2.0-85144822782
dc.identifier.urihttp://hdl.handle.net/11449/249506
dc.language.isoeng
dc.relation.ispartofJournal of the Brazilian Society of Mechanical Sciences and Engineering
dc.sourceScopus
dc.subjectCAD/CAM milling
dc.subjectDental glass–ceramics
dc.subjectMechanical properties
dc.subjectRoughness
dc.titleImpact of diamond tool wear on the surface finish of lithium silicate glass ceramics machined with the assistance of CAD/CAM systemsen
dc.typeArtigo
unesp.author.orcid0000-0002-9398-0639[6]

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