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Evaluating the reliability and repeatability of the digital color analysis system for dentistry


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Evaluating the reliability and repeatability of the digital color analysis system for dentistry

Article information

Restor Dent Endod. 2008;33(4):352-368
Publication date (electronic) : 2008 July 31
doi : https://doi.org/10.5395/JKACD.2008.33.4.352
Joong-Jae Jeong, Su-Jung Park, 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 2008 April 22; Revised 2008 May 26; Accepted 2008 May 29.

Abstract

This study was done to evaluate the reliability of the digital color analysis system (ShadeScan, CYNOVAD, Montreal, Canada) for dentistry.

Sixteen tooth models were made by injecting the A2 shade chemical cured resin for temporary crown into the impression acquired from 16 adults. Surfaces of the model teeth were polished with resin polishing cloth. The window of the ShadeScan handpiece was placed on the labial surface of tooth and tooth images were captured, and each tooth shade was analyzed with the ShadeScan software. Captured images were selected in groups, and compared one another.

Two models were selected to evaluate repeatability of ShadeScan, and shade analysis was performed 10 times for each tooth.

And, to ascertain the color difference of same shade code analyzed by ShadeScan, CIE L*a*b*values of shade guide of Gradia Direct (GC, Tokyo, Japan) were measured on the white and black background using the Spectrolino (GretagMacbeth, USA), and Shade map of each shade guide was captured using the ShadeScan.

There were no teeth that were analyzed as A2 shade and unique shade. And shade mapping analyses of the same tooth revealed similar shade and distribution except incisal third.

Color difference (ΔE*) among the Shade map which analyzed as same shade by ShadeScan were above 3.

Within the limits of this study, digital color analysis instrument for dentistry has relatively high repeatability, but has controversial in accuracy.

Keywords: Tooth color; Digital color; Color analysis; Color repeatability; ShadeScan

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Article information Continued

Copyright © 2008 The 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

Shade Map of the maxillary central incisors.

Figure 2

Figure 2

Shade Map of the maxillary lateral incisors.

Figure 3

Figure 3

Shade Map of the maxillary canines.

Figure 4

Figure 4

Shade Map of the maxillary first premolars.

Figure 5

Figure 5

Shade Map of the maxillary second premolars.

Figure 6

Figure 6

Repeated measurement of a central incisor.

Figure 7

Figure 7

Repeated measurement of a canine.

Figure 8

Figure 8

Shade Map of A1 shade guide on the black background (upper) and white background (below) according to thickness.

Figure 9

Figure 9

Shade Map of A3 shade guide on the black background (upper) and white background (below) according to thickness.

Table 1

Vita shade-guide colors (O'Brien et al.26, 1989)

Table 1

Table 2

CIE L*a*b* value of shade guides measured on the black background and white background

Table 2

Table 3

Color difference (ΔE*) of 3 mm thickness shade guide between measured on the black background and white background

Table 3

Table 4

Color difference (ΔE*) among shade guides that analysed as same Vita code

Table 4

A1 (1W) : 1 mm A1 shade guide analysed on white background

B3 (1B) : 1 mm B3 shade guide analysed on black background