S-Space College of Dentistry/School of Dentistry (치과대학/치의학대학원) Dept. of Dentistry (치의학과) Journal Papers (저널논문_치의학과)
Comparison of the color of natural teeth measured by a colorimeter and Shade Vision System
- Cho, Byeong-Hoon; Lim, Yong-Kyu; Lee, Yong-Keun
- Issue Date
- dental materials 23 (2007) 1307–1312
- Objectives. The objectives were to measure the difference in the color and color parameters
of natural teeth measured by a tristimulus colorimeter (CM, used as a reference) and
Shade Vision System (SV), and to determine the influence of color parameters on the color
difference between the values measured by two instruments.
Method. Color of 12 maxillary and mandibular anterior teeth was measured by CM and SV
for 47 volunteers (number of teeth = 564). Color parameters such as CIE L*, a* and b* values,
chroma and hue angle measured by two instruments were compared. Chroma was calculated
as C∗ab = (a∗2 + b∗2)1/2, and hue angle was calculated as h◦ = arctan(b*/a*). The influence
of color parameters measured by CM on the color difference ( E∗ab) between the values
measured by two instruments was analyzed with multiple regression analysis (˛ = 0.01).
Results. Mean E∗ab value between the values measured by two instruments was 21.7 (±3.7),
and the mean difference in lightness (CIE L*) and chroma was 16.2 (±3.9) and 13.2 (±3.0),
respectively. Difference in hue angle was high as 132.7 (±53.3)◦. Except for the hue angle, all
the color parameters showed significant correlations and the coefficient of determination
(r2) was in the range of 0.089–0.478. Based on multiple regression analysis, the standardized
partial correlation coefficient (ˇ) of the included predictors for the color difference was
−0.710 for CIE L* and −0.300 for C∗ab (p < 0.01).
Conclusion. All the color parameters showed significant but weak correlations except for hue
angle. When lightness and chroma of teeth were high, color difference between the values
measured by two instruments was small. Clinical accuracy of two instruments should be
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