Spectrophotometric error in colour coordinates introduced by fluorescence of white calibration tile

Fluorescence of Layered Resin Composites

“…12 Color differences of resin composites between the values measured under the standard illuminants A and D65, or A and C, were larger than those between D65 and C. 13 In previous studies exact measurement of fluorescence was impossible because spectral distributions of illuminants were The difference in spectral reflectance can be regarded as the fluorescence of substance excited by the UV component of the standard illuminant D65. 8 The difference in reflection spectra of tooth between the values measured under illuminations A and D65 showed no evidence of a contribution of fluorescence to tooth color in spectra or color coordinates. 14 To induce fluorescence of dentin, UV light of 365 nm (or 363.8 nm) has generally been employed.…”

“…2 Natural teeth emit a strong blue fluorescence under the action of UV light. 8 Recently the use of resin composites for the restoration of large defects in anterior teeth has been increas-ing, and layered resin composites with opaque dentin and translucent enamel shades are widely promoted for this purpose. In human enamel three distinct luminescence peaks have been found in the region of 350 to 360, 405 to 410, and 440 to 450 nm.…”

Reflectance factor measurement systematic errors due to near infrared fluorescence

“…The broadband illumination and monochromatic detection method is the integration of the bispectral radiance factor along the detection wavelength weighted by the broadband spectral power distribution. The difference in the two methods has been observed in the literature under different circumstances 9, 10. The largest difference for the orange tile is that the reflectance factor in the blue wavelengths is seven times less than the red wavelengths.…”

“…The difference in the two methods has been observed in the literature under different circumstances. 9,10 The largest difference for the orange tile is that the reflectance factor in the blue wavelengths is seven times less than the red wavelengths. Therefore, addition of the fluorescence to the blue wavelength radiance factor is much more significant than when added to the red wavelength radiance factors.…”

Uncertainty budget for PTB’s gonioreflectometers and ways to improve it in the short VIS spectral range

“…This effect depends on the applied wavelength and is often triggered by short wavelengths. Fluorescence is material specific and the induced error in diffuse reflectance measurements must therefore be considered for the particular sample under test [23].…”