Are Dental Color Measuring Devices CIE Compliant?

Lehmann, Karl Martin; Devigus, Alessandro; Igiel, Christopher; Weyhrauch, Michael; Schmidtmann, Irene; Wentaschek, Stefan; Scheller, Herbert
September 2012
European Journal of Esthetic Dentistry;Autumn2012, Vol. 7 Issue 3, p324
Academic Journal
Objectives: This in vitro study evaluated the accordance of dental color measurement devices with a Commission International ede 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-compliantreference system by recording the L*C*h° color coordinates of ceramic samples matching the tooth colors of the Vita Linear guide 3D-Master®, under standardized test conditions. Differences between regression lines for the dental color measurement device data and regression lines for the CIE-compliantreference system data were evaluated.Results: All devices offered high intraclasscorrelation 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-compliantreference system regarding the L*C*h° color coordinates.


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