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KMID : 1023420150150050577
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Journal of Dental Hygiene Science
2015 Volume.15 No. 5 p.577 ~ p.584
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Effect of Metal Chloride Coloring Liquids on Color and Strength Changes of Tetragonal Zirconia Polycrystals
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Oh Jong-Jin
Noh Hyeong-Rok
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Abstract
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The purpose of this study was to evaluate the effect of metal chloride infiltration treatment on color and strength changes of the yttria-stabilized tetragonal zirconia polycrystals (Y-TZP). Fifty disc specimens were prepared with a Y-TZP powder (ZPEX; Tosoh, Japan). Thirty different metal chloride solutions containing 0.03∼0.08 wt% chromium and 0.03∼0.07 wt% terbium ions were prepared. Presintered Y-TZP specimens were soaked in metal chloride coloring liquids for 3 minutes and sintered in air at 1,450℃ for 2 hours. The color of the specimens was measured with spectrophotometer and color difference (ΔE *) was obtained based on the CIE L *, a*, b* color coordinate values. To evaluate the effect of metal chloride infiltration strength changes, the biaxial flexural test was performed at crosshead speed 0.5 mm/min. Colors of the sintered Y-TZP showed the colors of Vita shade guide A1, A2 and A3 with the infiltration of chromium and terbium chloride solutions. Density of the sintered Y-TZP increased by the infiltration of chromium and terbium chloride solutions. Bi-axial flexural strength of the sintered Y-TZP did not show statistically significant differences by the infiltration of chromium and terbium chloride solutions (p＞0.05). Chromium and terbium chloride did not affect the crystal phase of zirconia, and all specimens showed tetragonal phase. Accordingly, this study suggests that chromium and terbium chlorides can make colored zirconia while adding in a liquid form. The color of colored zirconia differ from that of vita shade guide but it can use all ceramic restoration as substructure in dental clinic.
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KEYWORD
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Biaxial flexural strength, Chromium, Coloring agents, Terbium, Zirconium dioxide
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