Proposal of new dental color-space for aesthetic dental materials

Yun-Jeong Oh; Su-Jung Park; Dong-Jun Kim; Hyun-Gu Cho; Yun-Chan Hwang; Won-Mann Oh; In-Nam Hwang

doi:10.5395/JKACD.2007.32.1.019

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Oh, Park, Kim, Cho, Hwang, Oh, and Hwang: Proposal of new dental color-space for aesthetic dental materials

Original Article

Journal of Korean Academy of Conservative Dentistry

Journal of Korean Academy of Conservative Dentistry 2007; 32(1): 19-27.

Published online: 31 January 2007

DOI: https://doi.org/10.5395/JKACD.2007.32.1.019

Proposal of new dental color-space for aesthetic dental materials

Yun-Jeong Oh, Su-Jung Park, Dong-Jun Kim, Hyun-Gu Cho, Yun-Chan Hwang, Won-Mann Oh, In-Nam Hwang

Department of Conservative Dentistry, School of Dentistry, DSRI, Chonnam National University, Korea.

Corresponding Author: In-Nam Hwang. Department of Conservative Dentistry, School of Dentistry, Chonnam National University, 5 Hak-dong, Dong-gu, Gwangju, 501-757, Korea. Tel: 82-62-220-4443, Fax: 82-62-225-8387, hinso@jnu.ac.kr

Received 4 October 2006 Revised 11 December 2006 Accepted 18 December 2006

(open-access):

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

The purpose of this study is to develope new dental color-space system. Twelve kinds of dental composites and one kind of dental porcelain were used in this study. Disk samples (15 mm in diameter, 4 mm in thickness) of used materials were made and sample's CIE L^*a^*b^* value was measured by Spectrocolorimeter (MiniScan XE plus, Model 4000S, diffuse/8° viewing mode, 14.3 mm Port diameters, Hunter Lab. USA). The range of measured color distribution was analyzed. All the data were applied in the form of T### which is expression unit in CNU Cons Dental Color Chart.

The value of L^* lies between 80.40 and 52.70. The value of a^* are between 10.60 and 3.60 and b^* are between 28.40 and 2.21. The average value of L^* is 67.40, and median value is 67.30. The value of a^* are 2.89 and 2.91 respectively. And for the b^*, 14.30 and 13.90 were obtained. The data were converted to T### that is the unit count system in CNU-Cons Dental Color Chart. The value of L^* is converted in the first digit of the numbering system. Each unit is 2.0 measured values. The second digit is the value of a^* and is converted new number by 1.0 measured value. For the third digit b^* is replaced and it is 2.0 measured unit apart. T555 was set to the value of L^* ranging from 66.0 to 68.0, value of a^* ranging from 3 to 4 and b^* value ranging from 14 to 16.

Keywords: Tooth color, Color system, Dental color space, CIE L^*a^*b^*, Esthetic material, Dental color chart

Figures and Tables

Figure 1

Schematic diagram of the CIE L^*a^*b^* color system.

Figure 2

Diagram of the CNU-Cons Dental Color system.

Figure 3

L^* and C^* value of the tested materials.

Figure 4

a^* and b^* value of the tested materials.

Figure 5

Histogram of the L^* value.

Figure 6

Histogram of the a^* value.

Figure 7

Histogram of the b^* value.

Table 1

Used materials in this study

Table 2

Descriptive statistics of the measured L^*a^*b^* values

Table 3

L^*a^*b^* range of the T### code in CNU Cons Dental Color Chart

Table 4

Application of new color code of CNU Cons Dental Color Chart to two light cured composites (ChamFil & Z-100)

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