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Article Abstract
Objectives: This study evaluated the impact of blinding shade guide tabs on the accuracy of colour selection and the preference for shades in the A hue category.
Methods: Disc-shaped specimens were created in 8 shades: 4 in the A hue (A1, A2, A3, A4) and 4 in different hues (B1, B2, C2, D3). Using both blinded and unblinded guides, 15 dental students and 15 experienced dentists evaluated the specimens' shades. Colour accuracy was assessed using the overall colour difference (ΔE00) and individual colour coordinates (CIELCH system) between the selected shade tab and the actual specimen. The percentage of selections favouring the A hue was also calculated.
Results: Blinding the shade guide tabs did not significantly impact the accuracy of colour selection. However, unblinded evaluations resulted in a higher percentage of selections favouring the A hue (44%) compared with blinded evaluations (34%). No significant difference was found between the evaluations of dental students and experienced dentists.
Conclusion: Blinding shade guide tabs did not affect the precision of colour selection but reduced the tendency to choose shades in the A hue category.
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