Are dental color measuring devices CIE compliant?
OBJECTIVE
This in vitro study evaluated the accordance of dental color measurement devices with a Commission Internationale de l'Eclairage (CIE)-compliant reference system, by comparing the CIE lightness, chroma, and hue (L*C*h°) color coordinates of ceramic samples.


METHODS
Four color measurement devices: Vita Easyshade® Advance (A); DeguDent Shadepilot (B); X-Rite® Shadevision (C); and Crystaleye Olympus (D), were compared with a CIE-compliant reference system by recording the L*C*h° color coordinates of ceramic samples matching the tooth colors of the Vita Linearguide 3D-Master®, under standardized test conditions. Differences between regression lines for the dental color measurement device data and regression lines for the CIE-compliant reference system data were evaluated.


RESULTS
All devices offered high intraclass correlation coefficients (0.9771- 0.9999) for the L*C*h° color coordinates. The regression lines of the L* and C* coordinates for device A were steeper than those of the CIE-compliant reference system; the regression lines for devices B, C, and D were nearly parallel to those of the reference system, but with an offset. The regression lines of the h° coordinates for all devices were almost parallel to those of the reference system, with slopes near 1. Excluding the L* and h° coordinate measurements of device A, the measurements with the devices exhibited deviations from the reference system that were greater than those expected by chance (P < 0.0002).


CONCLUSIONS
The dental color measurement devices assessed here offered excellent reproducibility, but showed significant deviations from the CIE-compliant reference system regarding the L*C*h° color coordinates.
Department of Prosthetic Dentistry, University Medical Center, Mainz, Germany. karl.lehmann@unimedizin-mainz.de
Karl Martin
KM
Lehmann
Alessandro
A
Devigus
Christopher
C
Igiel
Michael
M
Weyhrauch
Irene
I
Schmidtmann
Stefan
S
Wentaschek
Herbert
H
Scheller
D000704:Analysis of Variance; D003124:Colorimetry / Q000295:instrumentation*; D003776:Dental Porcelain; D017267:Dental Prosthesis Design / Q000592:standards*; D006801:Humans; D017797:Prosthesis Coloring / Q000592:standards*; D012015:Reference Standards; D012044:Regression Analysis; D015203:Reproducibility of Results; D013053:Spectrophotometry / Q000295:instrumentation
D003776:Dental Porcelain