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KMID : 0362420110490010073
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Journal of Korean Academy of Prosthodontics
2011 Volume.49 No. 1 p.73 ~ p.79
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The effect of repeated firings on the color of zirconia-based all-ceramic system
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Jang Jung-Eun
Kim Mu-Hyon
Yun Mi-Jung
Jeon Yun-Kyung
Jeon You-Jin
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Abstract
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PURPOSE: The aim of this study was to evaluate the effect of repeated firings on the color of zirconia restoration with different shading method.
MATERIALS AND METHODS: Three different types of zirconia frameworks (adding metallic pigments to the initial zirconia powder before sintering (Group NM), dipping the milled frameworks in dissolved coloring agents (Group KI), or application of liner material to the sintered white frameworks (Group KW) were used to support A3 shade dentin porcelain. Repeated firings (3, 5, or 7) were performed, color differences among ceramic specimens were measured using a colorimeter. Repeated measurements analysis of variance (ANOVA) was used to analyze the data for significant difference. The Tukey Honestly Significant Different (HSD) test was used to perform multiple comparisons (α= .05).
RESULTS: 1. L*a*b* values of the ceramic systems were affected by the number of firings (1, 3, 5 or 7 firings) (P < .001) and shading methods (P < .001). 2. As the number of firings increased, the L* (for all groups) and a* value (for KW and NM groups) decreased and the b* value(for all groups) increased. 3. The mean color differences caused by repeated firings were perceptible (ΔE > 1) for group KW and KI fired after 3 times, except for group NM fired after 7 times. 4. In order of decreasing ΔE value fired after 7 times, the values were group KI(ΔE = 2.26) > group KW (ΔE = 1.47) > group NM (ΔE = 1.08) (P < .001).
CONCLUSION: Repeated firings influenced the color of the zirconium-oxide all-ceramic specimens with different shading methods.
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KEYWORD
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Zirconia, Shading, Repeated firings, Color
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