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

Article information

Restor Dent Endod. 2007;32(5):411-418

Publication date (electronic) : 2007 September 30

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

Yong-Jin Choi , Su-Jung Park , Hyun-Gu Cho , Yun-Chan Hwang , Won-Mann Oh , Byung-Ju Park ¹, 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 2007 June 16; Revised 2007 July 07; Accepted 2007 July 31.

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

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