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Effect of Coloring Agent on the Strength and Transmittance of Dental Zirconia Block
Int J Clin Prev Dent 2017;13(4):223-230
Published online December 31, 2017;
© 2017 International Journal of Clinical Preventive Dentistry.

Ju-Won Yoon1, Chung-Jae Lee2, Myung-Gu Lee3

1Department of Dental Technology, Dongnam Health University, Suwon, 2Department of Dental Laboratory Technology, Shin Han University, Uijeongbu, 3Department of Biomedical Chemistry, College of Biomedical and Health Science, Konkuk University, Chungju, Korea
Correspondence to: Myung-Gu Lee
Department of Biomedical Chemistry, College of Biomedicaland Health Science, Konkuk University, 268 Chungwon- daero, Chungju 27478, Korea. 
Tel: +82-43-840-4803, Fax: +82-43-840-4810, E-mail:
Received December 21, 2017; Accepted December 21, 2017.
This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License ( which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
Objective: The purpose of this study is to compare and evaluate the fracture resistance and transmittance of several types of zirconia for CAD/CAM. Four types of zirconia blocks including specimens with coloring agents were used for this study.Methods: Forty specimens were prepared in total, 5 pieces each. The biaxial flexural bending strength and transmittance measurement using D65 light source were compared to investigate its characteristics, and XRD and SEM images of each specimen were used to observe the phase change and microstructure. ISO 6872 is the current standard used for evaluating the physical and mechanical properties of zirconia dental materials is. In the biaxial flexural strength test, the block specimen diameter was 20 mm and the specimen thickness was measured with a precision of 1 mm.Results: The transmittance of the prepared specimens was lowered by an average of 10% after applying the coloring agent, but not by block. In this axial flexural strength test, the increase of 80 to 100 MPa was observed in the other zirconia blocks excluding the Trans Blocks.Conclusion: There was no statistically significant difference between the materials. It was found to be statistically significant only in High Shine Blocks.
Keywords : compressive strength, zirconium oxide, coloring agents
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