Effect of sintering temperature on aging resistance and mechanical properties of 3Y-TZP dental ceramic

Abstract

In order to investigate the effect of sintering temperature on aging properties and mechanical properties of 3Y-TZP dental ceramic in simulated oral environment, 3Y-TZP nanopowder compacts were pressurelessly sintered at 1 350 °C,1 400 °C, 1 450 °C,1 500 °C, respectively, then were treated by soaking in artificial saliva (65 °C, pH=7) for two months. The treated specimens sintered at 1 350 °C showed there was no phase transformation but whose strength and toughnesswere significantly improved (P<0.05), while those sintered at 1 400 °C–1 500 °C revealed a small amount of phase transformation and insignificant mechanical reinforcement (P>0.05). No micro-cracks were detected but increment in lattice volume was found in all specimens. Lowering sintering temperature favors aging resistance and mechanical reinforcement of 3Y-TZP in a simulated oral environment.

Keywords

3Y-TZP / dental ceramic / sintering temperature / simulated oral environment / low temperature aging

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