Question

A 30-year-old male patient received an all-ceramic crown on a maxillary anterior toothHe returns the next day reporting that his family noticed the crown appears bluishWhat is the most likely reason for this?

• A. Dentist did shade selection in natural sunlight
• B. Shade selection in fluorescent light with red-yellow intensity
• C. Shade selection in fluorescent light with blue-green intensity
• D. Shade selection done in incandescent blue-green light

Hint:

Always perform shade selection under color-corrected daylight lighting to avoid metamerism.

Answer 1

The Correct Option is C

Step 1: Understanding Metamerism.
Metamerism is a phenomenon in which two colors appear to match under one light source but look different under another light sourceShade selection in dentistry must be performed under standardized lighting conditions to avoid this effect
Step 2: Effect of Fluorescent Light.
Fluorescent light often has a blue-green intensityIf shade selection is performed under such lighting, the tooth may appear balanced at that timeHowever, under natural daylight or incandescent light, the restoration may appear bluish due to incorrect color compensation
Step 3: Excluding Other Options.
Natural sunlight is considered ideal for shade selection
Red-yellow intensity light (incandescent) tends to make teeth appear warmer, not bluish
Incandescent light does not typically produce a blue-green dominant spectrum
Step 4: Conclusion.
Since fluorescent light with blue-green intensity can cause metamerism leading to a bluish appearance under different lighting conditions, the correct answer is Shade selection in fluorescent light with blue-green intensity