Exploring Ductility in Dental Ceramics

dc.contributor.authorAlves, L. M.M. [UNESP]
dc.contributor.authorRodrigues, C. S. [UNESP]
dc.contributor.authorVardhaman, S.
dc.contributor.authorSaunders, C.
dc.contributor.authorSchneider, J. M.
dc.contributor.authorLawn, B. R.
dc.contributor.authorZhang, Y.
dc.contributor.institutionNew York University College of Dentistry
dc.contributor.institutionUniversidade Estadual Paulista (UNESP)
dc.contributor.institutionUniversity of Pennsylvania
dc.contributor.institutionNational Institute of Standards and Technology
dc.date.accessioned2023-03-01T20:07:14Z
dc.date.available2023-03-01T20:07:14Z
dc.date.issued2022-01-01
dc.description.abstractTwo damage regimes—“brittle” and “ductile”—have been identified in the literature on ceramic grinding, machining, grit blasting, and wear. In the brittle regime, the damage mechanism is essentially crack formation, while in the ductile region, it is quasiplasticity. Onset of the brittle mode poses the greater threat to strength, so it becomes important to understand the mechanics of ductile–brittle thresholds in these materials. Controlled microcontact tests with a sharp indenter are employed to establish such thresholds for a suite of contemporary computer-aided design/computer-aided manufacturing dental ceramics. Plots of flexural strength S versus indentation load P show a steep decline beyond the threshold, consistent with well-established contact mechanics relations. Threshold dimensions occur on a scale of order 1 µm and contact load of order 1 N, values pertinent to practical grit finishing protocols. The ductile side of ceramic shaping is accessed by reducing grit sizes, applied loads, and depths of cut below critical levels. It is advocated that critical conditions for ductile shaping may be most readily quantified on analogous S(P) plots, but with appropriate machining variable (grit size, depths of cut, infeed rate) replacing load P. Working in the ductile region offers the promise of compelling time and cost economies in prosthesis fabrication and preparation.en
dc.description.affiliationDepartment of Biomaterials and Biomimetics New York University College of Dentistry
dc.description.affiliationDepartment of Dental Materials and Prosthodontics Institute of Science and Technology São Paulo State University, SP
dc.description.affiliationDepartment of Preventive and Restorative Sciences School of Dental Medicine University of Pennsylvania
dc.description.affiliationMaterial Measurement Laboratory National Institute of Standards and Technology
dc.description.affiliationUnespDepartment of Dental Materials and Prosthodontics Institute of Science and Technology São Paulo State University, SP
dc.identifierhttp://dx.doi.org/10.1177/00220345221100409
dc.identifier.citationJournal of Dental Research.
dc.identifier.doi10.1177/00220345221100409
dc.identifier.issn1544-0591
dc.identifier.issn0022-0345
dc.identifier.scopus2-s2.0-85131731023
dc.identifier.urihttp://hdl.handle.net/11449/240227
dc.language.isoeng
dc.relation.ispartofJournal of Dental Research
dc.sourceScopus
dc.subjectbiaxial flexural strength, machining
dc.subjectbrittle fracture
dc.subjectgrinding
dc.subjectgrit blasting
dc.subjectmicrocontact thresholds
dc.titleExploring Ductility in Dental Ceramicsen
dc.typeArtigo
unesp.author.orcid0000-0002-6738-3769[7]

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