Fig. 2From: Comparison of light transmittance and color changes between polyurethane and copolyester retainer materials after staining and destainingInstruments used for the measurement of studied parameters. (A) Spectrometer/Integrating sphere system for evaluation of percent light transmittance, (B) A diagram of light transmittance measurement system. (C) The Spectrophotometer (CM-2600d Spectrophotometer, Konica Minolta, Tokyo, Japan) for color parameter changeBack to article page