Colour Measurement Agreement Between Digital Assisted Devices And Conventional Methods

Objectives: To make a clinical evaluation on the possibilities for colour measurement using digital and conventional methods.
Methods: 216 clinical estimations of colour of the front upper and lower teeth are made, using:SpectroShadе^TM Micro (MHT Optic Research AG),VITA Easyshade Advance 4.0 (Vita) and a conventional shade guide Vita 3D-Master.The colour of each tooth is evaluated in three zones: cervical, medium and incisal. The results are collected in individual cards for colour measurement, prepared especially for the research. The indicators are analyzed separately by their lightness,chroma and hue using measure of agreement-kappa and nonparametrical analysis Wilcoxon Signed Ranks Test (р<0.05).
Results: The analysis of the data about the indicator-hue shows a relative coincidence when measured with SpectroShade^TM and a conventional method(kappa=0,292) and when measured with Easyshade Advance and a conventional method(kappa=0,377).There is no coincidence in the data about hue,measured with SpectroShade^TM and Easyshade Advance(kappa=0,102).The analysis of the data about lightness and chroma,measured with the two devices and a conventional method shows a coincidence and no statistically significant difference.
Conclusions: The modern devices for colour measurement give the opportunity for fast,recreative and independent from exterior conditions way for assessment of colour.They reduce the subjective clinician's influence and the necessity for special light conditions.