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dc.typeArtigo de periódicopt_BR
dc.titleEffects Of Surface Treatments, Thermocycling, And Cyclic Loading On The Bond Strength Of A Resin Cement Bonded To A Lithium Disilicate Glass Ceramic.pt_BR
dc.contributor.authorGuarda, G Bpt_BR
dc.contributor.authorCorrer, A Bpt_BR
dc.contributor.authorGonçalves, L Spt_BR
dc.contributor.authorCosta, A Rpt_BR
dc.contributor.authorBorges, G Apt_BR
dc.contributor.authorSinhoreti, M A Cpt_BR
dc.contributor.authorCorrer-Sobrinho, Lpt_BR
unicamp.authorG B Guarda, Department of Restorative Dentistry, State University of Campinas, UNICAMP, Piracicaba, Brazil.pt_BR B Correr,pt S Gonçalves,pt R Costa,pt A Borges,pt A C Sinhoreti,pt Correr-Sobrinho,pt
dc.subjectAcid Etching, Dentalpt_BR
dc.subjectAluminum Oxidept_BR
dc.subjectBisphenol A-glycidyl Methacrylatept_BR
dc.subjectComposite Resinspt_BR
dc.subjectCuring Lights, Dentalpt_BR
dc.subjectDental Bondingpt_BR
dc.subjectDental Etchingpt_BR
dc.subjectDental Porcelainpt_BR
dc.subjectDental Stress Analysispt_BR
dc.subjectHydrofluoric Acidpt_BR
dc.subjectMaterials Testingpt_BR
dc.subjectMicroscopy, Electron, Scanningpt_BR
dc.subjectPolyethylene Glycolspt_BR
dc.subjectPolymethacrylic Acidspt_BR
dc.subjectRadiation Dosagept_BR
dc.subjectResin Cementspt_BR
dc.subjectSelf-curing Of Dental Resinspt_BR
dc.subjectStress, Mechanicalpt_BR
dc.subjectSurface Propertiespt_BR
dc.subjectTensile Strengthpt_BR
dc.subjectTime Factorspt_BR
dc.description.abstractSUMMARY Objectives : The aim of this present study was to investigate the effect of two surface treatments, fatigue and thermocycling, on the microtensile bond strength of a newly introduced lithium disilicate glass ceramic (IPS e.max Press, Ivoclar Vivadent) and a dual-cured resin cement. Methods : A total of 18 ceramic blocks (10 mm long × 7 mm wide × 3.0 mm thick) were fabricated and divided into six groups (n=3): groups 1, 2, and 3-air particle abraded for five seconds with 50-μm aluminum oxide particles; groups 4, 5, and 6-acid etched with 10% hydrofluoric acid for 20 seconds. A silane coupling agent was applied onto all specimens and allowed to dry for five seconds, and the ceramic blocks were bonded to a block of composite Tetric N-Ceram (Ivoclar Vivadent) with RelyX ARC (3M ESPE) resin cement and placed under a 500-g static load for two minutes. The cement excess was removed with a disposable microbrush, and four periods of light activation for 40 seconds each were performed at right angles using an LED curing unit (UltraLume LED 5, Ultradent) with a final 40 second light exposure from the top surface. All of the specimens were stored in distilled water at 37°C for 24 hours. Groups 2 and 5 were submitted to 3,000 thermal cycles between 5°C and 55°C, and groups 3 and 6 were submitted to a fatigue test of 100,000 cycles at 2 Hz. Specimens were sectioned perpendicular to the bonding area to obtain beams with a cross-sectional area of 1 mm(2) (30 beams per group) and submitted to a microtensile bond strength test in a testing machine (EZ Test) at a crosshead speed of 0.5 mm/min. Data were submitted to analysis of variance and Tukey post hoc test (p≤0.05). Results : The microtensile bond strength values (MPa) were 26.9 ± 6.9, 22.2 ± 7.8, and 21.2 ± 9.1 for groups 1-3 and 35.0 ± 9.6, 24.3 ± 8.9, and 23.9 ± 6.3 for groups 4-6. For the control group, fatigue testing and thermocycling produced a predominance of adhesive failures. Fatigue and thermocycling significantly decreased the microtensile bond strength for both ceramic surface treatments when compared with the control groups. Etching with 10% hydrofluoric acid significantly increased the microtensile bond strength for the control group.en
dc.relation.ispartofOperative Dentistrypt_BR
dc.relation.ispartofabbreviationOper Dentpt_BR
dc.identifier.citationOperative Dentistry. v. 38, n. 2, p. 208-17pt_BR
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