Shade Matching Calculator
Evaluate dental shade match quality using spectrophotometer L*a*b* values and Delta E color difference.
Medical Disclaimer
This calculator is for informational and educational purposes only. It is not a substitute for professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider before making decisions about your health. Never disregard professional medical advice or delay seeking it because of results from this tool.
Inputs
Results
Delta E
1.5
Match Quality
Good (perceptible by trained eye)
How to Use This Calculator
- Take a spectrophotometer reading of the restoration and enter the Sample L*, a*, and b* values.
- Enter the Target L*, a*, and b* values from the natural tooth reading.
- Review the calculated Delta E — values below 1.0 are imperceptible, below 3.3 are clinically acceptable.
- Check Match Quality and the Clinically Acceptable flag to determine if the restoration passes.
- Use the Value Assessment and Chroma Assessment guidance to adjust layering or staining as needed.
How the result changes with Sample L* (Lightness)
| Sample L* (Lightness) | Delta E | Match Quality |
|---|---|---|
| 46 | 28.02 | Poor (obvious mismatch) |
| 59 | 15.04 | Poor (obvious mismatch) |
| 76 | 2.29 | Acceptable (noticeable by casual observer) |
| 90 | 16.04 | Poor (obvious mismatch) |
What each input means
- Sample L* (Lightness)
- L* value from spectrophotometer reading of the restoration.
- Sample a* (Red-Green)
- a* value (positive = red, negative = green).
- Sample b* (Yellow-Blue)
- b* value (positive = yellow, negative = blue).
- Target L*
- Target tooth L* value.
- Target a*
- Target tooth a* value.
- Target b*
- Target tooth b* value.
How this is calculated
Worked example, using the default values
- Identify Input Parameters4 parametersSample L* (Lightness) = 75, Sample a* (Red-Green) = 2, Sample b* (Yellow-Blue) = 15, Target L* = 74 = 6 input(s) provided
- Calculate Delta EDelta E1.5 = 1.5
- Calculate Match QualityGood (perceptible by trained eye) = Good (perceptible by trained eye)
- Calculate Clinically AcceptableYes = Yes
- Calculate Value AssessmentValue AssessmentToo light = Too light
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