Ceramic firing protocols and thermocycling: effects on the load-bearing capacity under fatigue of a bonded zirconia lithium silicate glass-ceramic

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dc.contributor.authorDiniz, Vandeberg [UNESP]
dc.contributor.authorCondé Oliveira Prado, Pedro Henrique [UNESP]
dc.contributor.authorMeireles Rodrigues, Jonas Vinicius [UNESP]
dc.contributor.authorMonteiro, Jaiane Bandoli [UNESP]
dc.contributor.authorZucuni, Camila
dc.contributor.authorValandro, Luiz Felipe
dc.contributor.authorMelo, Renata M. [UNESP]
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionFederal University of Santa Maria
dc.date.accessioned2020-12-12T01:31:57Z
dc.date.available2020-12-12T01:31:57Z
dc.date.issued2020-10-01
dc.description.abstractThis study evaluated the effect of different firing processes (without firing, additional crystallization and glaze firing) and thermal-cycling (with or without) on the fatigue behavior of simplified zirconia-lithium silicate (ZLS) glass ceramic restorations cemented to a dentin-like material. Materials and Methods. One hundred twenty-nine (129) discs (diameter = 12 mm and thickness = 1.2 mm) of ZLS (Celtra Duo, Dentsply Sirona) and fiber-reinforced epoxy resin (diameter = 12 mm and thickness = 2.3 mm) were produced and tested under fatigue according to 2 study factors: a firing protocol with 3 levels (without firing, additional crystallization and glaze firing) and thermocycling of 2 levels (absence/presence), composing 6 study groups. Ceramic and epoxy resin discs had their surfaces treated and adhesive cementation was performed (Multilink N, Ivoclar). Half of the samples were immediately tested; the other half were subjected to thermal-cycling (10,000 cycles in water; 5-55 °C). The staircase method determined the fatigue failure load (100,000 cycles at a frequency of 20 Hz). The fatigue data (in N) were submitted to 2-way ANOVA and Bonferroni test (p < 0.05). Fractographic analyses were also carried out. Thermocycling decreased the fatigue failure load (FFL) of all groups when compared to those without aging. Bonferroni's test indicated that the groups with crystallization/glazing process behaved better in terms of FFL than those without firing in the same storage condition. All the samples had radial cracks and all fractures originated from defects on the cementation surface of the ceramic discs. Crystallization and glaze firing had a positive effect on the fatigue failure load of adhesively cemented ZLS glass ceramic compared to the group without crystallization firing, in both storage conditions (with or without thermocycling).en
dc.description.affiliationRestorative Dentistry Division of Prosthodontics São Paulo State University (UNESP) Institute of Science and Technology
dc.description.affiliationOral Science Division of Prosthodontics Faculty of Odontology Federal University of Santa Maria
dc.description.affiliationUnespRestorative Dentistry Division of Prosthodontics São Paulo State University (UNESP) Institute of Science and Technology
dc.description.sponsorshipCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
dc.description.sponsorshipIdCAPES: 001
dc.identifierhttp://dx.doi.org/10.1016/j.jmbbm.2020.103963
dc.identifier.citationJournal of the Mechanical Behavior of Biomedical Materials, v. 110.
dc.identifier.doi10.1016/j.jmbbm.2020.103963
dc.identifier.issn1878-0180
dc.identifier.issn1751-6161
dc.identifier.scopus2-s2.0-85088473872
dc.identifier.urihttp://hdl.handle.net/11449/199144
dc.language.isoeng
dc.relation.ispartofJournal of the Mechanical Behavior of Biomedical Materials
dc.sourceScopus
dc.subjectAging
dc.subjectCrystallization
dc.subjectFatigue
dc.subjectGlass ceramics
dc.titleCeramic firing protocols and thermocycling: effects on the load-bearing capacity under fatigue of a bonded zirconia lithium silicate glass-ceramicen
dc.typeArtigo
unesp.author.orcid0000-0001-7203-6924[6]

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