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In-lab simulation of CAD/CAM milling of lithium disilicate glass-ceramic specimens: Effect on the fatigue behavior of the bonded ceramic

dc.contributor.authorPilecco, Rafaela Oliveira
dc.contributor.authorDalla-Nora, Fernanda
dc.contributor.authorGuilardi, Luís Felipe
dc.contributor.authorPereira, Gabriel Kalil Rocha
dc.contributor.authorde Andrade, Guilherme Schmitt [UNESP]
dc.contributor.authorde Melo, Renata Marques [UNESP]
dc.contributor.authorValandro, Luiz Felipe
dc.contributor.authorRippe, Marília Pivetta
dc.contributor.institutionFederal University of Santa Maria
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.date.accessioned2021-06-25T11:02:24Z
dc.date.available2021-06-25T11:02:24Z
dc.date.issued2021-09-01
dc.description.abstractThe aim of this study was to evaluate the effect of in-lab simulation procedures performed on a lithium disilicate ceramic luted to a dentin-analogue material regarding the fatigue performance and topographic changes. Lithium disilicate ceramic (IPS e.max CAD) discs (Ø = 13.5 mm and 1.5 mm of thickness) were produced in different ways: milled in a CAD/CAM system (CAD/CAM – control group); mirror-polished (POL group); produced in-lab and ground with #60 silicon carbide paper (SiC group); with #60 wood sandpaper (WS group); with a fine diamond bur (DB group); or with a CAD/CAM bur adapted in a handpiece with a custom mandrel (MANDREL group). The ceramic discs were adhesively luted (Multilink N) onto dentin analogue discs (Ø = 12 mm and 2 mm of thickness) and fatigue testing (n = 19 discs) was performed by step-stress methodology (initial load of 200 N; step-size of 50 N; 10,000 cycles per step; 20 Hz). Surface roughness and contact angle analysis were also performed. According to Kaplan-Meier and post-hoc Mantel-Cox (log-rank), distinct fabrication methods affected the fatigue performance of bonded glass-ceramic discs (p< 0.001). The CAD/CAM group presented the lowest fatigue failure loads (1250 N) and number of cycles for failure (185,000), while the POL groups obtained the highest results (1752 N; 284,444 cycles). The in-lab groups had intermediate values (1355 – 1526 N; 206,052 – 238,684 cycles). Polished specimens presented the lowest roughness values (Ra = 0.041 μm), while the SiC (1.604 μm), WS (1.701 μm), and MANDREL (1.867 μm) groups showed statistically similar roughness values to the CAD/CAM group (1.738 μm). Despite differences before etching, the contact angle was similar among the milled and simulated groups after etching, except for the polished group. Even with some topographic similarities, the tested in-lab simulation methods were not able to mimic the milled specimens in terms of fatigue findings, leading to distinct magnitude of overestimations of the results.en
dc.description.affiliationMSciD and PhD Graduate Programs in Oral Science – Prosthodontic Units Faculty of Odontology Federal University of Santa Maria
dc.description.affiliationDepartment of Dental Materials and Prosthodontics Institute of Science and Technology ICT/SJC São Paulo State University – UNESP, São José dos Campos
dc.description.affiliationUnespDepartment of Dental Materials and Prosthodontics Institute of Science and Technology ICT/SJC São Paulo State University – UNESP, São José dos Campos
dc.identifierhttp://dx.doi.org/10.1016/j.jmbbm.2021.104604
dc.identifier.citationJournal of the Mechanical Behavior of Biomedical Materials, v. 121.
dc.identifier.doi10.1016/j.jmbbm.2021.104604
dc.identifier.issn1878-0180
dc.identifier.issn1751-6161
dc.identifier.scopus2-s2.0-85107791220
dc.identifier.urihttp://hdl.handle.net/11449/207866
dc.language.isoeng
dc.relation.ispartofJournal of the Mechanical Behavior of Biomedical Materials
dc.sourceScopus
dc.subjectBonding
dc.subjectComputer-aided design/computer-aided manufacturing
dc.subjectGrinding
dc.subjectLithium disilicate
dc.subjectMechanical behavior
dc.subjectSurface properties
dc.subjectSurvival probability
dc.titleIn-lab simulation of CAD/CAM milling of lithium disilicate glass-ceramic specimens: Effect on the fatigue behavior of the bonded ceramicen
dc.typeArtigo
dspace.entity.typePublication
unesp.author.orcid0000-0002-7853-5967[1]
unesp.author.orcid0000-0002-0885-7805[2]
unesp.author.orcid0000-0002-9077-9067[4]
unesp.campusUniversidade Estadual Paulista (UNESP), Instituto de Ciência e Tecnologia, São José dos Campospt
unesp.departmentMateriais Odontológicos e Prótese - ICTpt

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