Influence of the labial surface irregularity on the measurement of the tooth color by spectrometer

Yong-Jin Choi; Su-Jung Park; Hyun-Gu Cho; Yun-Chan Hwang; Won-Mann Oh; Byung-Ju Park; In-Nam Hwang

doi:10.5395/JKACD.2007.32.5.411

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Original Article Influence of the labial surface irregularity on the measurement of the tooth color by spectrometer: Yong-Jin Choi, Su-Jung Park, Hyun-Gu Cho, Yun-Chan Hwang, Won-Mann Oh, Byung-Ju Park¹, In-Nam Hwang; 2007;32(5):-418.
DOI: https://doi.org/10.5395/JKACD.2007.32.5.411
Published online: September 30, 2007

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

¹Department of Oral Biochemistry, 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: June 16, 2007 • Revised: July 7, 2007 • Accepted: July 31, 2007

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Abstract
REFERENCES

Abstract

The most scientific and reliable method for deciding the tooth color is the instrumental measurement. However, such color measuring instrument shows the difference of the measuring value according to the diversified measuring condition.

This study was conducted to evaluate what effect of the labial surface irregularity of the tooth to the result of the color measured by spectrometer.

11 models of the teeth were made by injecting the A2 shade Luxatemp Automix Plus (DMG, Germany) into the impression acquired from 11 adults. Standard disk samples (15 mm diameter, 7 mm thickness) were made with same material. CIE L^*a^*b^* value was measured at the incisal, central, and gingival area of the central incisor, lateral incisor, canine and first premolar using Specbos 2100 (JETI, Germany) spectrometer. Color difference was calculated between labial surface and standard samples.

Among all models of the teeth, L^* and b^* value showed the reducing tendency as they go toward the gingival area, but a^* value showed the increasing tendency.

Color difference between model teeth and standard samples showed the most difference at the incisal area, but the gingival area showed the least difference. And the canine showed the least color difference from the comparison of standard sample, and the central incisor showed the highest difference (p < 0.01).

Although the visually detectable difference of the measuring value showed notably depending on the type and measured area (p < 0.05), L^* and a^* value showed notable differences depending more on the measured areas than on the type of the teeth.
Keywords: Tooth color; Spectrometer; Labial surface irregularity; CIE L^*a^*b^*; Color difference; Tooth color measurement

Figure 1

Diagram of the Duplex-Fiber bundle.

Figure 2

L^* and C^* value of the tested disc samples and tooth models.

CI : Central incisor, LI : Laterial Incisor, Ca : Canine, P : Premolar, I : Incisal, M : Middle, C : Cervical

Figure 3

a^* and b^* value of the tested disc samples and tooth models.

Table 1

CIE L^*a^*b^* and C^* values of disc samples and tooth models

Standard deviations are in parentheses.

Table 2

Statistical analysis between tooth and measured area

Table 3

Color difference (ΔE^*) between disc sample and tooth models

Table 4

Color difference among measured area

^*There are statistically significant differences among groups (p < 0.01).

REFERENCES

1. Sproull RC. Color matching in dentistry. Part II: Practical applications of the organization of color. J Prosthet Dent. 1973;29: 556-566.PubMed
2. Miller L. Organizing color in dentistry. J Am Dent Assoc. 1987 12;(Spec No):26E-40E.Article PubMed
3. Johnston WM, Kao EC. Assessment of appearance match by visual observation and clinical colorimeter. J Dent Res. 1989;68: 819-822.Article PubMed PDF
4. Hwang IN, Oh WM. Colorimetric analysis of extracted human teeth and five shade guides. J Korean Acad Conserv Dent. 1997;22: 769-781.
5. O'Neal SJ, Powell WD. Color discrimination and shade matching ability of third year dental student. J Prosthet Dent. 1984;63: 174.
6. Van der Burgt TP, ten Bosch JJ, Borsboom PC, Plasschaert AJ. A new method for matching tooth colors with color standard. J Dent Res. 1985;64: 837-841.Article PubMed PDF
7. Macentee M, Lakowski R. Instrumental color measurement of vital and extracted teeth. J Oral Rehabil. 1981;8: 203-208.PubMed
8. O'Brien WJ, Boenke KM, Groh CL. Coverage error of two shade guide. Int J Prosthodont. 1991;4: 45-50.PubMed
9. Hammad IA. Intrarater repeatability of shade selections with two shade guides. J Prosthet Dent. 2003;89: 50-53.PubMed
10. Lemire PA, Burk B. Color in dentistry. 1975;Hartford: CT J.M Ney Co..
11. Grajower R, Revah A, Sorin S. Reflectance spectra of natural and acrylic teeth. J Prosthet Dent. 1976;36: 570-579.PubMed
12. 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.Article PubMed
13. Goodkind RJ, Keenan KM, Schwabacher WB. A comparison of Chromascan and spectrophotometric color measurement of 100 natural teeth. J Prosthet Dent. 1985;53: 105-109.PubMed
14. Schwabacher WB, Goodkind RJ. Three-dimensional color coordinates of natural teeth compared with three shade guide. J Prosthet Dent. 1990;64: 425-431.PubMed
15. Cho KY, Hwang IN, Choi HR, Oh WM. Comparative evaluation of light-cured composite resins based on vita shade by spectrocolorimeter. J Korean Acad Conserv Dent. 1998;23: 424-432.
16. Lee MY, Shin DH. New evaluation technique in teeth color using digital camera. J Korean Acad Conserv Dent. 1997;22: 325-333.
17. Clifford MS. The Art and Science of Operative Dentistry. 1995;3rd ed. Mosby-Year book.
18. Clark EB. The color problem in dentistry. Dent Digest. 1931;499-509.
19. Clark EB. An analysis of tooth color. J Am Dent Assoc. 1931;18: 2093-2103.
20. Clark EB. Tooth color selection. J Am Dent Assoc. 1933;20: 1065-1073.
21. Mun EB. The application of color. 2002;Seoul: Kukjebooks; 215-271.
22. Park EJ. The basic of color moulding. 1996;2nd ed. Seoul: Mijinsa; 56-194.
23. Miller LL. Shade matching. J Esthet Dent. 1993;5: 143-152.Article PubMed
24. Tung FF, Goldstein GR, Jang S, Hittelman E. The repeatability of an intraoral dental colorimeter. J Prosthet Dent. 2002;88: 585-590.Article PubMed
25. Barrett AA, Grimaudo NJ, Anuscvice KJ, Yang MCK. Influence of tab and disk design on shade matching of dental porcelain. J Prosthet Dent. 2002;88: 591-597.PubMed
26. Hwang IN, Lee KW. Translucency of light cured composite resins depends on thickness & its influence on color of restorations. J Korean Acad Conserv Dent. 1999;24: 585-603.
27. Ruyter IE, Nilner K, Mo¨ller B. Color stability of dental composite resin materials for crown and bridge veneers. Dent Mater. 1987;3: 246-251.Article PubMed
28. Gross MD, Moser JB. A colorimetric study of coffee and tee staining of four composite resins. J Oral Rehabil. 1977;4: 311-322.PubMed

Tables & Figures

Figure 1

Diagram of the Duplex-Fiber bundle.

Figure 2

L^* and C^* value of the tested disc samples and tooth models.

CI : Central incisor, LI : Laterial Incisor, Ca : Canine, P : Premolar, I : Incisal, M : Middle, C : Cervical

Figure 3

a^* and b^* value of the tested disc samples and tooth models.

Table 1

CIE L^*a^*b^* and C^* values of disc samples and tooth models

Standard deviations are in parentheses.

Table 2

Statistical analysis between tooth and measured area

Table 3

Color difference (ΔE^*) between disc sample and tooth models

Table 4

Color difference among measured area

^*There are statistically significant differences among groups (p < 0.01).

REFERENCES

1. Sproull RC. Color matching in dentistry. Part II: Practical applications of the organization of color. J Prosthet Dent. 1973;29: 556-566.PubMed
2. Miller L. Organizing color in dentistry. J Am Dent Assoc. 1987 12;(Spec No):26E-40E.Article PubMed
3. Johnston WM, Kao EC. Assessment of appearance match by visual observation and clinical colorimeter. J Dent Res. 1989;68: 819-822.Article PubMed PDF
4. Hwang IN, Oh WM. Colorimetric analysis of extracted human teeth and five shade guides. J Korean Acad Conserv Dent. 1997;22: 769-781.
5. O'Neal SJ, Powell WD. Color discrimination and shade matching ability of third year dental student. J Prosthet Dent. 1984;63: 174.
6. Van der Burgt TP, ten Bosch JJ, Borsboom PC, Plasschaert AJ. A new method for matching tooth colors with color standard. J Dent Res. 1985;64: 837-841.Article PubMed PDF
7. Macentee M, Lakowski R. Instrumental color measurement of vital and extracted teeth. J Oral Rehabil. 1981;8: 203-208.PubMed
8. O'Brien WJ, Boenke KM, Groh CL. Coverage error of two shade guide. Int J Prosthodont. 1991;4: 45-50.PubMed
9. Hammad IA. Intrarater repeatability of shade selections with two shade guides. J Prosthet Dent. 2003;89: 50-53.PubMed
10. Lemire PA, Burk B. Color in dentistry. 1975;Hartford: CT J.M Ney Co..
11. Grajower R, Revah A, Sorin S. Reflectance spectra of natural and acrylic teeth. J Prosthet Dent. 1976;36: 570-579.PubMed
12. 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.Article PubMed
13. Goodkind RJ, Keenan KM, Schwabacher WB. A comparison of Chromascan and spectrophotometric color measurement of 100 natural teeth. J Prosthet Dent. 1985;53: 105-109.PubMed
14. Schwabacher WB, Goodkind RJ. Three-dimensional color coordinates of natural teeth compared with three shade guide. J Prosthet Dent. 1990;64: 425-431.PubMed
15. Cho KY, Hwang IN, Choi HR, Oh WM. Comparative evaluation of light-cured composite resins based on vita shade by spectrocolorimeter. J Korean Acad Conserv Dent. 1998;23: 424-432.
16. Lee MY, Shin DH. New evaluation technique in teeth color using digital camera. J Korean Acad Conserv Dent. 1997;22: 325-333.
17. Clifford MS. The Art and Science of Operative Dentistry. 1995;3rd ed. Mosby-Year book.
18. Clark EB. The color problem in dentistry. Dent Digest. 1931;499-509.
19. Clark EB. An analysis of tooth color. J Am Dent Assoc. 1931;18: 2093-2103.
20. Clark EB. Tooth color selection. J Am Dent Assoc. 1933;20: 1065-1073.
21. Mun EB. The application of color. 2002;Seoul: Kukjebooks; 215-271.
22. Park EJ. The basic of color moulding. 1996;2nd ed. Seoul: Mijinsa; 56-194.
23. Miller LL. Shade matching. J Esthet Dent. 1993;5: 143-152.Article PubMed
24. Tung FF, Goldstein GR, Jang S, Hittelman E. The repeatability of an intraoral dental colorimeter. J Prosthet Dent. 2002;88: 585-590.Article PubMed
25. Barrett AA, Grimaudo NJ, Anuscvice KJ, Yang MCK. Influence of tab and disk design on shade matching of dental porcelain. J Prosthet Dent. 2002;88: 591-597.PubMed
26. Hwang IN, Lee KW. Translucency of light cured composite resins depends on thickness & its influence on color of restorations. J Korean Acad Conserv Dent. 1999;24: 585-603.
27. Ruyter IE, Nilner K, Mo¨ller B. Color stability of dental composite resin materials for crown and bridge veneers. Dent Mater. 1987;3: 246-251.Article PubMed
28. Gross MD, Moser JB. A colorimetric study of coffee and tee staining of four composite resins. J Oral Rehabil. 1977;4: 311-322.PubMed

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Influence of the labial surface irregularity on the measurement of the tooth color by spectrometer

J Korean Acad Conserv Dent. 2007;32(5):411-418. Published online September 30, 2007

DOI: https://doi.org/10.5395/JKACD.2007.32.5.411

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Figure

Influence of the labial surface irregularity on the measurement of the tooth color by spectrometer

Figure 1 Diagram of the Duplex-Fiber bundle.

Figure 2 L* and C* value of the tested disc samples and tooth models. CI : Central incisor, LI : Laterial Incisor, Ca : Canine, P : Premolar, I : Incisal, M : Middle, C : Cervical

Figure 3 a* and b* value of the tested disc samples and tooth models.

Figure 1

Figure 2

Figure 3

Influence of the labial surface irregularity on the measurement of the tooth color by spectrometer

Table 1

CIE L^*a^*b^* and C^* values of disc samples and tooth models

Standard deviations are in parentheses.

Table 2

Statistical analysis between tooth and measured area

Table 3

Color difference (ΔE^*) between disc sample and tooth models

Table 4

Color difference among measured area

^*There are statistically significant differences among groups (p < 0.01).

Table 1 CIE L*a*b* and C* values of disc samples and tooth models

Standard deviations are in parentheses.

Table 2 Statistical analysis between tooth and measured area

Table 3 Color difference (ΔE*) between disc sample and tooth models

Table 4 Color difference among measured area

^*There are statistically significant differences among groups (p < 0.01).