Warning: mkdir(): Permission denied in /home/virtual/lib/view_data.php on line 81

Warning: fopen(upload/ip_log/ip_log_2024-12.txt): failed to open stream: No such file or directory in /home/virtual/lib/view_data.php on line 83

Warning: fwrite() expects parameter 1 to be resource, boolean given in /home/virtual/lib/view_data.php on line 84
Proposal of new dental color-space for aesthetic dental materials


Your browser does not support the NLM PubReader view.

Go to this page to see a list of supporting browsers.

Proposal of new dental color-space for aesthetic dental materials

Article information

Restor Dent Endod. 2007;32(1):19-27
Publication date (electronic) : 2007 January 31
doi : https://doi.org/10.5395/JKACD.2007.32.1.019
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 2006 October 04; Revised 2006 December 11; Accepted 2006 December 18.

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

References

1. Clark EB. An analysis of tooth color. J Am Dent Assoc 1931. 182093–2103.
2. Clark EB. Tooth color selection. J Am Dent Assoc 1933. 201065–1073.
3. Miller LL. Shade matching. J Esthet Dent 1993. 5143–153.
4. Miller LL. Organizing color in dentistry. J Am Dent Assoc 1987. 12. Spec No26E–40E.
5. Hayashi T. Medical color standard. V. Tooth crown 1967. Tokyo: Japan Color Research Institute;
6. Sproull RC. Color matching in dentistry. Part II: Practical applications of the organization of color. J Prosthet Dent 1973. 29556–566.
7. Lemire PA, Burk B. Color in dentistry 1975. Hartford: CT J.M Ney Co.;
8. Grajower R, Revah A, Sorin S. Reflectance spectra of natural and acrylic teeth. J Prosthet Dent 1976. 36570–579.
9. Macentee M, Lakowski R. Instrumental color measurement of vital and extracted teeth. J Oral Rehabil 1981. 8203–208.
10. Goodkind RJ, Schwabacher WB. Use of a fiber-optic colorimeter for in vivo color measurements of 2830 anterior teeth. J Prosthet Dent 1987. 58535–542.
11. Park HG, Jeong JH. A Study on the Color of Korean Natural Teeth. J Korean Acad Prosthodont 1988. 26185–196.
12. Hwang IN, Oh WM. Colorimetric analysis of extracted human teeth and five shade guides. J Korean Acad Conserv Dent 1997. 22769–781.
13. Cho GM, Shin DH. Color analysis of the natural teeth with a modified intraoral spectrophotometer. J Korean Acad Conserv Dent 1998. 23223–235.
14. Hwang IN, Lee GW. Translucency of light cured composite resins depends on thickess & its influence on color of restorations. J Korean Acad Conserv Dent 1999. 24604–613.
15. Goodkind RJ, Loupe MJ. Teaching of color in predoctoral and postdoctoral dental education in 1988. J Prosthet Dent 1992. 67713–717.
16. Kim HS, Um JM. A study on color differences between composite resins and shade guides. J Korean Acad Conserv Dent 1996. 21107–120.
17. Cho GI, Hwang IN, Choi HR, O WM. Comparative evaluation of light-cred composite resins based on vita shade by spectrocolorimeter. J Korean Acad Conserv Dent 1998. 23424–432.
18. Gross MD, Moser JB. A colorimetric study of coffee and tee staining of four composite resins. J Oral Rehabil 1977. 4311–322.
19. Seghi RR, Hewlett ER, Kim J. Visual and instrumental colorimetric asessments of small color differences on translucent dental porcelain. J Dent Res 1989. 681760–1764.
20. Wozniak WT. Proposed guidelines for the acceptance program for dental shade guides 1987. Chicago: American Dental Association;
21. O'Neal SJ, Powell WD. Color discrimination and shade matching ability of third year dental student. J Prosthet Dent 1984. 63174.

Article information Continued

Copyright © 2007 Korean Academy of Conservative Dentistry
(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.

Figure 1

Figure 1

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

Figure 2

Figure 2

Diagram of the CNU-Cons Dental Color system.

Figure 3

Figure 3

L* and C* value of the tested materials.

Figure 4

Figure 4

a* and b* value of the tested materials.

Figure 5

Figure 5

Histogram of the L* value.

Figure 6

Figure 6

Histogram of the a* value.

Figure 7

Figure 7

Histogram of the b* value.

Table 1

Used materials in this study

Table 1

Table 2

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

Table 2

Table 3

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

Table 3

Table 4

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

Table 4