Polishing of Ground Y-TZP Ceramic is Mandatory for Improving the Mechanical Behavior.

摘要: It evaluated the effect of aging by Low Temperature Degradation (LTD), executed after post- processing surface treatments (polishing, heat treatment and glazing), on characteristics (micromorphology roughness) structural stability (phase transformation mechanical behavior-flexural strength reliability) a ground yttrium-stabilized tetragonal zirconia polycrystal (Y-TZP) ceramic. Discs Y-TZP (VITA In-Ceram YZ) were manufactured (ISO:6872-2015; 15 mm in diameter 1.2 ± 0.2 thickness) randomly assigned into 10 groups according two factors: "aging" 2 levels (with or without) "surface treatment" 5 (Ctrl: as-sintered; Gr: grinding with coarse diamond bur; Gr + HT: plus treatment; Pol: polishing; Gl: glazing). Roughness (n=30), biaxial flexural test phase (n=2), topography (n=2) analyses performed. Aging led to an intense increase monoclinic (m) content for all tested conditions, being as-sintered samples (Ctrl= 65.6%) more susceptible t-m transformation. Despite increasing m-phase content, was not detrimental characteristic (except condition). There no significant reduction Weibull modulus treatments. Additionally, glazing decrease strength, while polishing presented highest values. Thus, is mandatory ceramic, performing heat-treatment alone lead worst performance.