| In this article, the application background of dental Zirconia ceramics isintroduced and its overall properties especially aging properties are thoroughlydiscussed. It is pointed out that sintering methods and the choice of dopingagents could influence the properties of dental Zirconia ceramics greatly, andthat polishing as well as other industrial processes may also affect its properties.During the experiments, Yttria-stabilized tetragonal Zirconia poly-crystal(Y-TZP) was doped with Fe and rare metals as coloring agents. The performanceof microwave sintering and normal sintering method on different temperaturewas also compared. Samples were treated under hydrothermal aging processbefore further testing methods including SEM, XRD and tests of bendingstrengthand fracture toughness. It was expected that we could find the influenceof sintering process and coloring agents on aging properties of dental ZirconiaceramicsIt was confirmed that microwave sintering benefited the anti-agingperformance of Y-TZP without reducing mechanical properties. Relativelynormal sintering ways would either show poor mechanical properties or be weakagainst hydrothermal aging. Among coloring agents, rare metalswere proved tosuppress the aging process, while Fe was proved to enhance the aging process.Coloring agents seemed to reduce mechanical properties, but when added beforethe molding process, the reduction would be lower. Monoclinic phase producedby hydrothermal aging as well as the polishing process was responsible for theincreasing of bending strength of Y-TZP. It was also found that adding Aluminainto Y-TZP would give rise to its ant-aging performance. |
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