Fatigue limit of polycrystalline zirconium oxide ceramics: Effect of grinding and low-temperature aging

Journal of the Mechanical Behavior of Biomedical Materials
G K R PereiraLuiz F Valandro

Abstract

The following study aimed to evaluate the effect of grinding and low-temperature aging on the fatigue limit of Y-TZP ceramics for frameworks and monolithic restorations. Disc specimens from each ceramic material, Lava Frame (3M ESPE) and Zirlux FC (Ivoclar Vivadent) were manufactured according to ISO:6872-2008 and assigned in accordance with two factors: (1) "surface treatment"-without treatment (as-sintered, Ctrl), grinding with coarse diamond bur (181µm; Grinding); and (2) "low-temperature aging (LTD)" - presence and absence. Grinding was performed using a contra-angle handpiece under constant water-cooling. LTD was simulated in an autoclave at 134°C under 2-bar pressure for 20h. Mean flexural fatigue limits (20,000 cycles) were determined under sinusoidal loading using stair case approach. For Lava ceramic, it was observed a statistical increase after grinding procedure and different behavior after LTD stimuli (Ctrl<Grinding; Ctrl<Ctrl Ltd; Grinding=Grinding Ltd); while for Zirlux, grinding and low-temperature aging promoted a statistical increase in the fatigue limit (Ctrl<Grinding; Ctrl<Ctrl Ltd; Grinding<Grinding Ltd). An important increase was observed in m-phase content after both stimuli (grinding and LTD), although wi...Continue Reading

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Citations

Feb 28, 2016·Journal of the Mechanical Behavior of Biomedical Materials·G K R PereiraL F Valandro
Nov 5, 2016·Journal of the Mechanical Behavior of Biomedical Materials·L F GuilardiL F Valandro
Sep 23, 2016·Brazilian Dental Journal·Gabriela Scatimburgo PolliJosé Maurício Dos Santos Nunes Reis
Apr 18, 2017·Journal of Dentistry·C ChenF R Tay
Nov 9, 2017·Brazilian Oral Research·Rodrigo Diniz PradoLuiz Felipe Valandro
May 4, 2018·Brazilian Oral Research·Marina AmaralLuiz Felipe Valandro
Dec 22, 2017·Brazilian Dental Journal·Tais SilvestriLuiz Felipe Valandro
Dec 6, 2018·Brazilian Dental Journal·Camila Pauleski ZucuniLuiz Felipe Valandro

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