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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Choi, Park, Cho, Hwang, Oh, Park, and Hwang: Influence of the labial surface irregularity on the measurement of the tooth color by spectrometer

Original Article

Journal of Korean Academy of Conservative Dentistry

Journal of Korean Academy of Conservative Dentistry 2007; 32(5): 411-418.

Published online: 30 September 2007

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

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

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 16 June 2007 Revised 7 July 2007 Accepted 31 July 2007

(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 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

Figures and Tables

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).

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