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http://dx.doi.org/10.5762/KAIS.2018.19.8.176

Effect of coloring agent dryness on zirconia color  

Lee, Joo-Hee (Department of Dental Lab Technology, Daejeon Health Institute of Technology)
Park, Jin-Young (Institute for Health Science, Korea University)
Kim, Hae-Jung (Kim&Lee Inc.)
Moon, Yun Hee (School of Health Sciences, Dankook University)
Kim, Woong-Chul (Department of Dental Laboratory Science and Engineering, College of Health Science, Korea University)
Publication Information
Journal of the Korea Academia-Industrial cooperation Society / v.19, no.8, 2018 , pp. 176-182 More about this Journal
Abstract
One of the most important factor of esthetic prosthesis is the color of the teeth. Zirconia is produced in the process of design, milling, coloring, drying, and sintering. The effect of the drying degree of zirconia colorant on the color tone is examined. For the experiment, a total of 45 zirconia specimens(15 for each) were fabricated by using cad/cam system. The zirconia specimens(L block(LAZOR), Z block(Zircos-E block posterior), A block(AlphaZ)) were then subjected to zirconia sintering in accordance with the manufacturer's instructions, using a chemical coloring agent to Non-drying(0sec), intermediate (10sec), and completely dried (10min) temperature holding times. The color tone was measured using a spectrophotometer. The results were analyzed with a One-way analysis of variance and the Tukey post-hoc test (${\alpha}=.05$) The $L^*$ values of L, A specimens, $a^*$ values of A specimens, and $b^*$ values of Z specimens were not statistically different according to the degree of drying (p>0.05), While the $L^*$ value of Z specimen, $a^*$ value of L, Z specimen, $b^*$ values of L, A specimens were statistically different according to the degree of drying(p <0.05). In conclusion, the drying of zirconia colourants improves zirconia brightness and increases the optical properties of the enamel.
Keywords
Acid base coloring liquid; Coloring agent; Temperature dwelling time; Zirconia; Zirconia shade;
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Times Cited By KSCI : 3  (Citation Analysis)
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