Show simple item record

dc.contributor.authorBasilio, Mariana de Almeida
dc.contributor.authorCardoso, Katia Vieira [UNESP]
dc.contributor.authorAntonio, Selma Gutierrez [UNESP]
dc.contributor.authorRizkalla, Amin Sami
dc.contributor.authorSantos Junior, Gildo Coelho
dc.contributor.authorArioli Filho, Joao Neudenir [UNESP]
dc.date.accessioned2018-11-26T16:54:52Z
dc.date.available2018-11-26T16:54:52Z
dc.date.issued2016-08-01
dc.identifier.citationJournal Of Prosthetic Dentistry. New York: Mosby-elsevier, v. 116, n. 2, p. 277-285, 2016.
dc.identifier.issn0022-3913
dc.identifier.urihttp://hdl.handle.net/11449/161806
dc.description.abstractStatement of problem. Most ceramic abutments are fabricated from yttria-stabilized tetragonal zirconia (Y-TZP). However, Y-TZP undergoes hydrothermal degradation, a process that is not well understood. Purpose. The purpose of this in vitro study was to assess the effects of artificial aging conditions on the fracture load, phase stability, and surface microstructure of a Y-TZP abutment. Material and methods. Thirty-two prefabricated Y-TZP abutments were screwed and tightened down to external hexagon implants and divided into 4 groups (n = 8): C, control; MC, mechanical cycling (1x10(6) cycles; 10 Hz); AUT, autoclaving (134 degrees C; 5 hours; 0.2 MPa); and TC, thermal cycling (10(4) cycles; 5 degrees/55 degrees C). A single-load-to-fracture test was performed at a crosshead speed of 0.5 mm/min to assess the assembly's resistance to fracture (ISO Norm 14801). X-ray diffraction (XRD) analysis was applied to observe and quantify the tetragonal-monoclinic (t-m) phase transformation. Representative abutments were examined with high-resolution scanning electron microscopy (SEM) to observe the surface characteristics of the abutments. Load-to-fracture test results (N) were compared by ANOVA and Tukey test (alpha=.05). Results. XRD measurements revealed the monoclinic phase in some abutments after each aging condition. All the aging conditions reduced the fracture load significantly (P<.001). Mechanical cycling reduced the fracture load more than autoclaving (P=.034). No differences were found in the process of surface degradation among the groups; however, the SEM detected grinding-induced surface flaws and microcracks. Conclusions. The resistance to fracture and the phase stability of Y-TZP implant abutments were susceptible to hydrothermal and mechanical conditions. The surface microstructure of Y-TZP abutments did not change after aging conditions.en
dc.description.sponsorshipFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.format.extent277-285
dc.language.isoeng
dc.publisherElsevier B.V.
dc.relation.ispartofJournal Of Prosthetic Dentistry
dc.sourceWeb of Science
dc.titleEffects of artificial aging conditions on yttria-stabilized zirconia implant abutmentsen
dc.typeArtigo
dcterms.licensehttp://www.elsevier.com/about/open-access/open-access-policies/article-posting-policy
dcterms.rightsHolderElsevier B.V.
dc.contributor.institutionMetropolitan Union Educ & Culture
dc.contributor.institutionUniversidade Estadual Paulista (UNESP)
dc.contributor.institutionWestern Univ
dc.description.affiliationMetropolitan Union Educ & Culture, Sch Dent, Div Prosthet Dent, Salvador, BA, Brazil
dc.description.affiliationSao Paulo State Univ UNESP, Araraquara Sch Dent, Dept Dent Mat & Prosthodont, Sao Paulo, Brazil
dc.description.affiliationSao Paulo State Univ, Inst Chem, Dept Phys Chem, Sao Paulo, Brazil
dc.description.affiliationWestern Univ, Schulich Sch Med & Dent, Dept Med Biophys, London, ON, Canada
dc.description.affiliationWestern Univ, Schulich Sch Med Dent, Dept Dent, Restorat Dent, London, ON, Canada
dc.description.affiliationSao Paulo State Univ, Araraquara Sch Dent, Dept Dent Mat & Prosthodont, Sao Paulo, Brazil
dc.description.affiliationUnespSao Paulo State Univ UNESP, Araraquara Sch Dent, Dept Dent Mat & Prosthodont, Sao Paulo, Brazil
dc.description.affiliationUnespSao Paulo State Univ, Inst Chem, Dept Phys Chem, Sao Paulo, Brazil
dc.description.affiliationUnespSao Paulo State Univ, Araraquara Sch Dent, Dept Dent Mat & Prosthodont, Sao Paulo, Brazil
dc.identifier.wosWOS:000381064900019
dc.rights.accessRightsAcesso aberto
dc.description.sponsorshipIdFAPESP: 2010/06651-5
dc.identifier.fileWOS000381064900019.pdf
dc.relation.ispartofsjr1,087
Localize o texto completo

Files in this item

Thumbnail

This item appears in the following Collection(s)

Show simple item record