The impact of hydrofluoric acid etching followed by unfilled resin on the biaxial strength of a glass-ceramic

dc.contributorUniversidade Estadual Paulista (UNESP)
dc.creatorPosritong, Sumana
dc.creatorBorges, Alexandre Luiz Souto
dc.creatorChu, Tien-Min Gabriel
dc.creatorEckert, George J.
dc.creatorBottino, Marco A.
dc.creatorBottino, Marco C.
dc.date2014-05-27T11:30:46Z
dc.date2016-10-25T18:54:36Z
dc.date2014-05-27T11:30:46Z
dc.date2016-10-25T18:54:36Z
dc.date2013-10-01
dc.date.accessioned2017-04-06T02:40:25Z
dc.date.available2017-04-06T02:40:25Z
dc.identifierDental Materials.
dc.identifier0109-5641
dc.identifierhttp://hdl.handle.net/11449/76703
dc.identifierhttp://acervodigital.unesp.br/handle/11449/76703
dc.identifier10.1016/j.dental.2013.08.210
dc.identifierWOS:000325928100003
dc.identifier2-s2.0-84884668283
dc.identifier0000-0002-5707-7565
dc.identifierhttp://dx.doi.org/10.1016/j.dental.2013.08.210
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/897394
dc.descriptionObjectives: To evaluate the null hypotheses that hydrofluoric (HF) acid etching time would neither decrease the biaxial flexural strength of a glass-based veneering ceramic nor enhance it after silane and unfilled resin (UR) applications. Methods: Disc-shaped IPS e.max ZirPress specimens were allocated into 12 groups: G1-control (no-etching), G2-30 s, G3-60 s, G4-90 s, G5-120 s, G6-60 s + 60 s. Groups (G7-G12) were treated in the same fashion as G1-G6, but followed by silane and UR applications. Surface morphology and roughness (Ra and Rq) of the ceramics were assessed by means of scanning electron microscopy (SEM) and profilometry, respectively. Flexural strength was determined by biaxial testing. Data were analyzed by two-way ANOVA and the Sidak test (α = 0.05). Weibull statistics were estimated and finite element analysis (FEA) was carried out to verify the stress concentration end areas of fracture. Results: The interaction (etching time vs. surface treatment) was significant for Ra (p = 0.008) and Rq (0.0075). Resin-treated groups presented significantly lower Ra and Rq than non-treated groups, except for the 60 s group (p < 0.005). SEM revealed that etching affected the ceramic microstructure and that the UR was able to penetrate into the irregularities. A significant effect of etching time (p = 0.029) on flexural strength was seen. G7-G12 presented higher strength than G1-G6 (p < 0.0001). None of experimental groups failed to show 95% confidence intervals of σ 0 and m overlapped. FEA showed lower stress concentration after resin treatment. Significance: HF acid etching time did not show a damaging effect on the ceramic flexural strength. Moreover, the flexural strength could be enhanced after UR treatment. © 2013 Academy of Dental Materials.
dc.languageeng
dc.relationDental Materials
dc.rightsinfo:eu-repo/semantics/closedAccess
dc.subjectBiaxial strength
dc.subjectGlass ceramic
dc.subjectHydrofluoric acid
dc.subjectUnfilled resin
dc.subjectVeneers
dc.titleThe impact of hydrofluoric acid etching followed by unfilled resin on the biaxial strength of a glass-ceramic
dc.typeOtro


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