Effect of Airborne-Particle Abrasion and Mechanico-Thermal Cycling on the Flexural Strength of Glass Ceramic Fused to Gold or Cobalt-Chromium Alloy

dc.contributorUniversidade Estadual Paulista (UNESP)
dc.creatorOliveira de Vasconcellos, Luis Gustavo
dc.creatorSilva, Lucas H.
dc.creatorReis de Vasconcellos, Luana Marotta
dc.creatorBalducci, Ivan
dc.creatorTakahashi, Fernando Eidi
dc.creatorBottino, Marco Antonio
dc.date2014-05-20T14:04:24Z
dc.date2016-10-25T17:10:09Z
dc.date2014-05-20T14:04:24Z
dc.date2016-10-25T17:10:09Z
dc.date2011-10-01
dc.date.accessioned2017-04-05T21:31:56Z
dc.date.available2017-04-05T21:31:56Z
dc.identifierJournal of Prosthodontics-implant Esthetic and Reconstructive Dentistry. Malden: Wiley-blackwell, v. 20, n. 7, p. 553-560, 2011.
dc.identifier1059-941X
dc.identifierhttp://hdl.handle.net/11449/22594
dc.identifierhttp://acervodigital.unesp.br/handle/11449/22594
dc.identifier10.1111/j.1532-849X.2011.00761.x
dc.identifierWOS:000296841000009
dc.identifierhttp://dx.doi.org/10.1111/j.1532-849X.2011.00761.x
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/867977
dc.descriptionPurpose: To evaluate the effect of airborne-particle abrasion and mechanico-thermal cycling on the flexural strength of a ceramic fused to cobalt-chromium alloy or gold alloy.Materials and Methods: Metallic bars (n = 120) were made (25 mm x 3 mm x 0.5 mm): 60 with gold alloy and 60 with Co-Cr. At the central area of the bars (8 mm x 3 mm), a layer of opaque ceramic and then two layers of glass ceramic (Vita VM13, Vita Zahnfabrick) were fired onto it (thickness: 1 mm). Ten specimens from each alloy group were randomly allocated to a surface treatment [(tungsten bur or air-particle abrasion (APA) with Al(2)O(3) at 10 mm or 20 mm away)] and mechanico-thermal cycling (no cycling or mechanically loaded 20,000 cycles; 10 N distilled water at 37 degrees C and then thermocycled 3000 cycles; 5 degrees C to 55 degrees C, dwell time 30 seconds) combination. Those specimens that did not undergo mechanico-thermal cyclingwere stored inwater (37 degrees C) for 24 hours. Bond strength was measured using a three-point bend test, according to ISO 9693. After the flexural strength test, failure types were noted. The data were analyzed using three factor-ANOVA and Tukey's test (alpha = 0.05).Results: There were no significant differences between the flexural bond strength of gold and Co-Cr groups (42.64 +/- 8.25 and 43.39 +/- 10.89 MPa, respectively). APA 10 and 20 mm away surface treatment (45.86 +/- 9.31 and 46.38 +/- 8.89 MPa, respectively) had similar mean flexural strength values, and both had significantly higher bond strength than tungsten bur treatment (36.81 +/- 7.60 MPa). Mechanico-thermal cycling decreased the mean flexural strength values significantly for all six alloy-surface treatment combinations tested when compared to the control groups. The failure type was adhesive in the metal/ceramic interface for specimens surface treated only with the tungsten bur, and mixed for specimens surface treated with APA 10 and 20 mm.Conclusions: Considering the levels adopted in this study, the alloy did not affect the bond strength; APA with Al(2)O(3) at 10 and 20 mm improved the flexural bond strength between ceramics and alloys used, and the mechanico-thermal cycling of metal-ceramic specimens resulted in a decrease of bond strength.
dc.languageeng
dc.publisherWiley-Blackwell
dc.relationJournal of Prosthodontics-implant Esthetic and Reconstructive Dentistry
dc.rightsinfo:eu-repo/semantics/closedAccess
dc.subjectDental materials
dc.subjectairborne-particle abrasion
dc.subjectmechanical and thermal-cycling
dc.subjectchromium alloy
dc.subjectgold alloy
dc.subjectsurface treatment
dc.subjectmetal/ceramic joint
dc.titleEffect of Airborne-Particle Abrasion and Mechanico-Thermal Cycling on the Flexural Strength of Glass Ceramic Fused to Gold or Cobalt-Chromium Alloy
dc.typeOtro


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