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J Korean Acad Prosthodont. 2017 Jan;55(1):18-25. Korean.
Published online Jan 25, 2017.  https://doi.org/10.4047/jkap.2017.55.1.18
© 2017 The Korean Academy of Prosthodontics
Effect of coloring agent on the color of zirconia
Kwanghyun Kim, Kwantae Noh, Ahran Pae, Yi-Hyung Woo and Hyeong-Seob Kim
Department of Prosthodontics, School of Dentistry, Kyung Hee University, Seoul, Republic of Korea.

Corresponding Author: Hyeong-Seob Kim. Department of Prosthodontics, School of Dentistry, Kyung Hee University 26, Kyungheedae-ro, Dongdaemun-gu, Seoul 02447, Republic of Korea. +82 (0)2 958 9340: Email: odontopia@khu.ac.kr
Received February 03, 2016; Revised December 01, 2016; Accepted January 04, 2017.

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.


Abstract

Purpose

The aim of this study was to evaluate the effect of two types of coloring agents and the number of application on the color of zirconia.

Materials and methods

Monolithic zirconia specimens (15.7 mm × 15.7 mm × 2.0 mm) (n = 33) was prepared and divided into 11 groups. Each experimental group was coded as a1-a5, w1-w5 according to the type of coloring agent and number of application. Specimens with no coloring agent applied were set as control group. The color difference of specimen was measured by using double-beam spectrophotometer, and calculated color difference (ΔE*ab), translucency parameter (TP). All data was analyzed with two-way ANOVA, multiple comparison Schéffe test, Pearson correlation and linear regression analysis.

Results

As the number of application increased, values of CIE L* was decreased, but values of CIE b* was increased in both coloring agents. However, there was no significant difference on values of translucency parameter. The color difference range of each group was 0.87 ΔE*ab to 9.43 ΔE*ab.

Conclusion

In this study, type of coloring agent and the number of application did not affect the color difference of zirconia.

Keywords: Coloring agent; Zirconia; Color; Translucency; Computer Aided Design/Computer Aided Manufacturing (CAD/CAM)

Figures


 Fig. 1
Specimens applied with acid-based coloring agent.
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Fig. 2
Specimens applied with water-based coloring agent.
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Fig. 3
Linear regression of CIE L* values over black background in the reflectance mode as function of the number of acid-based coloring liquid applications.
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Fig. 4
Linear regression of CIE L* values over black background in the reflectance mode as function of number of water-based coloring liquid application.
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Fig. 5
Linear regression of CIE b* values over black background in the reflectance mode as function of the number of acid-based coloring liquid applications.
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Fig. 6
Linear regression of CIE b* values over black background in the reflectance mode as function of the number of water-based coloring liquid applications.
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Fig. 7
Linear regression of CIE a* values over black background in the reflectance mode as function of the number of acid-based coloring liquid applications.
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Fig. 8
Linear regression of CIE a* values over black background in reflectance mode as function of number of water-based coloring liquid applications.
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Tables


 Table 1
Materials used in this study
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Table 2
Experimental groups
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Table 3
Means and standard deviations in parentheses for CIE L*, a* and b* values of each group over the black background
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Table 4
Means and standard deviations in parentheses for CIE L*, a* and b* values of each group over the white background
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Table 5
Relation between coloring agent and number of application in CIE L*
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Table 6
Relation between coloring agent and number of application in CIE a*
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Table 7
Relation between coloring agent and number of application in CIE b*
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Table 8
Color differences between each group (ΔEab)
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Table 9
Means and standard deviations in parentheses for translucency parameter of each group
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ORCID iDs

Kwantae Noh
https://orcid.org/http://orcid.org/0000-0003-3480-7737

Ahran Pae
https://orcid.org/http://orcid.org/0000-0001-8758-0754

Hyeong-Seob Kim
https://orcid.org/http://orcid.org/0000-0002-0964-0288

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