Abstract
Three mol.% yttria-stabilized tetragonal zirconia polycrystalline ceramics (3Y-TZP) billets were dipped in dyeing solution and then sintered for external dyeing. The effect of Pr and Er single elements on 3Y-TZP coloring and the rule of multivariate influence on the overall coloring effect after mixing were investigated and clarified. The structure, morphology, color and physical properties of 3Y-TZP were characterized by x-ray diffraction, scanning electron microscopy and spectrophotometry. The results show that Pr and Er show yellow and red, respectively, in the process of coloring, and the effect of Pr coloring is confirmed. When the two elements are used for dyeing at the same time, the value of a*, b* of the mixed color shows the additivity of the value of a*, b*, and the value of L* increases. This mixed dyeing is of great significance to the development of dental ceramics.
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