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: October 4, 2006 • Revised: December 11, 2006 • Accepted: December 18, 2006
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.
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)
REFERENCES
1. Clark EB. An analysis of tooth color. J Am Dent Assoc. 1931;18: 2093-2103.
2. Clark EB. Tooth color selection. J Am Dent Assoc. 1933;20: 1065-1073.
3. Miller LL. Shade matching. J Esthet Dent. 1993;5: 143-153.ArticlePubMed
4. Miller LL. Organizing color in dentistry. J Am Dent Assoc. 1987 12;Spec No: 26E-40E.ArticlePubMed
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;29: 556-566.PubMed
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;36: 570-579.PubMed
9. Macentee M, Lakowski R. Instrumental color measurement of vital and extracted teeth. J Oral Rehabil. 1981;8: 203-208.PubMed
10. Goodkind RJ, Schwabacher WB. Use of a fiber-optic colorimeter for in vivo color measurements of 2830 anterior teeth. J Prosthet Dent. 1987;58: 535-542.ArticlePubMed
11. Park HG, Jeong JH. A Study on the Color of Korean Natural Teeth. J Korean Acad Prosthodont. 1988;26: 185-196.
12. Hwang IN, Oh WM. Colorimetric analysis of extracted human teeth and five shade guides. J Korean Acad Conserv Dent. 1997;22: 769-781.
13. Cho GM, Shin DH. Color analysis of the natural teeth with a modified intraoral spectrophotometer. J Korean Acad Conserv Dent. 1998;23: 223-235.
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;24: 604-613.
15. Goodkind RJ, Loupe MJ. Teaching of color in predoctoral and postdoctoral dental education in 1988. J Prosthet Dent. 1992;67: 713-717.PubMed
16. Kim HS, Um JM. A study on color differences between composite resins and shade guides. J Korean Acad Conserv Dent. 1996;21: 107-120.
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;23: 424-432.
18. Gross MD, Moser JB. A colorimetric study of coffee and tee staining of four composite resins. J Oral Rehabil. 1977;4: 311-322.PubMed
19. Seghi RR, Hewlett ER, Kim J. Visual and instrumental colorimetric asessments of small color differences on translucent dental porcelain. J Dent Res. 1989;68: 1760-1764.PubMed
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;63: 174.
Tables & Figures
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)
REFERENCES
1. Clark EB. An analysis of tooth color. J Am Dent Assoc. 1931;18: 2093-2103.
2. Clark EB. Tooth color selection. J Am Dent Assoc. 1933;20: 1065-1073.
3. Miller LL. Shade matching. J Esthet Dent. 1993;5: 143-153.ArticlePubMed
4. Miller LL. Organizing color in dentistry. J Am Dent Assoc. 1987 12;Spec No: 26E-40E.ArticlePubMed
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;29: 556-566.PubMed
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;36: 570-579.PubMed
9. Macentee M, Lakowski R. Instrumental color measurement of vital and extracted teeth. J Oral Rehabil. 1981;8: 203-208.PubMed
10. Goodkind RJ, Schwabacher WB. Use of a fiber-optic colorimeter for in vivo color measurements of 2830 anterior teeth. J Prosthet Dent. 1987;58: 535-542.ArticlePubMed
11. Park HG, Jeong JH. A Study on the Color of Korean Natural Teeth. J Korean Acad Prosthodont. 1988;26: 185-196.
12. Hwang IN, Oh WM. Colorimetric analysis of extracted human teeth and five shade guides. J Korean Acad Conserv Dent. 1997;22: 769-781.
13. Cho GM, Shin DH. Color analysis of the natural teeth with a modified intraoral spectrophotometer. J Korean Acad Conserv Dent. 1998;23: 223-235.
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;24: 604-613.
15. Goodkind RJ, Loupe MJ. Teaching of color in predoctoral and postdoctoral dental education in 1988. J Prosthet Dent. 1992;67: 713-717.PubMed
16. Kim HS, Um JM. A study on color differences between composite resins and shade guides. J Korean Acad Conserv Dent. 1996;21: 107-120.
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;23: 424-432.
18. Gross MD, Moser JB. A colorimetric study of coffee and tee staining of four composite resins. J Oral Rehabil. 1977;4: 311-322.PubMed
19. Seghi RR, Hewlett ER, Kim J. Visual and instrumental colorimetric asessments of small color differences on translucent dental porcelain. J Dent Res. 1989;68: 1760-1764.PubMed
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;63: 174.
Citations
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