Objectives: The aim of this work was to assess the agreement between instrumental and
visual
colour matching.
Methods:
Shade selection with the 3DMaster Toothguide (Vita-Zahnfabrik) was performed
for
1361 maxillary central incisors and compared with the shade obtained with the EasyShade
Compact (Vita-Zahnfabrik) spectrophotometer.
Results:
We observed a greater correlation between the objective method and the subjective
one
in the colour dimension of lightness (Kappa 0.6587), followed by hue (Kappa 0.4337) and
finally
chroma (Kappa 0.3578).
Conclusion:
The colour dimension in which the greatest agreement is seen between the
operator
and the spectrophotometer is value or lightness.
Clinical
significance: This study reveals differences between the measurement of colour via
spectrophotometry
and the visual shade selection method. According to our results, there is
better
agreement in the value or lightness colour dimension, which is the most important
one
in the choice of tooth colour.