One-dimensional color order system for dental shade guides

Area of Science:

• Dental Materials Science
• Color Science
• Optical Engineering

Background:

• Dental shade guides are crucial for aesthetic restorations.
• Current shade guides often lack a consistent long-range color order.
• A logical color system improves user efficiency and accuracy.

Purpose of the Study:

• To reorganize the Bioform shade guide into a one-dimensional color system.
• To establish a long-range color order based on objective color difference measurements.
• To enhance the practical usability of dental shade guides.

Main Methods:

• Developed a methodology using a reflectance spectrophotometer to measure shade guide tooth colors.
• Obtained spectral data and converted it into CIE L*a*b* and Munsell color notations.
• Arranged shades based on color difference and compared with visual ranking and Munsell value.

Main Results:

• Measurement precision was determined to be within 0.5 CIE L*a*b* delta E.
• Bioform shades spanned Munsell hues from 0.9 Y to 3.5 Y, values from 6.6 to 7.8, and chromas from 1.9 to 4.1.
• Color difference arrangement showed a high correlation (0.95) with visual perception, superior to Munsell value (0.90).

Conclusions:

• A one-dimensional color system based on color difference provides superior agreement with visual perception.
• This objective arrangement method enhances the logical ordering of dental shade guides.
• The findings support the development of more intuitive and accurate dental shade selection tools.