Assessment of Tooth Shade Measurement Precision and Consistency with Digital Photography Calibration System.

Area of Science:

• Dental Imaging
• Color Science
• Biomedical Engineering

Background:

• Accurate dental color assessment is crucial for aesthetic restorations.
• Digital imaging systems offer potential for objective color measurement.
• Comparing digital photography to established spectrophotometry is necessary to validate new technologies.

Purpose of the Study:

• To evaluate the precision and repeatability of the ColorChecker Passport Photo (X-Rite) digital imaging system.
• To compare its performance against spectrophotometric measurements using the Vita Easyshade®.
• To assess the reliability of digital photography for dental color mapping.

Main Methods:

• Eighty participants (aged 19-25) had maxillary right central incisor color measured.
• Standardized laboratory conditions were used for both digital photography and Vita Easyshade 5.0 spectrophotometry.
• CIELAB L, a, b values were recorded three times for each method.

Main Results:

• Both methods exhibited high consistency (Cronbach's alpha 0.94-1).
• Digital photography showed moderate correlations with spectrophotometry (Pearson r=0.44-0.66, p<0.05).
• Spectrophotometry was significantly more accurate than digital photography (p<0.05), though digital photography showed consistent, minor deviations.

Conclusions:

• The "capture to edit" digital imaging method demonstrates high consistency and repeatability.
• While less accurate than spectrophotometry, its reliability makes it suitable for comparative dental color mapping.
• Digital photography provides a valuable, consistent tool for tracking color changes and comparisons between images.