Prosthodontics & Occlusion · single question
When selecting crown shade, what is the RECOMMENDED position for the clinician's eye relative to the tooth?
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Correct answer: C. At the level of the tooth
Crown shade should be selected with the clinician's eyes at the same level as the tooth (direct horizontal view). This ensures accurate color perception without angular distortion. Additional tips: use natural daylight or shade-corrected lighting, evaluate the moist tooth (not after air-drying), take the shade before tooth preparation (before dehydration), and evaluate quickly (first impression is most accurate).
- A. ❌ Looking down at the tooth changes the color perception angle and may alter the apparent hue/value.
- B. ❌ Looking up at the tooth changes the light reflection and perceived color.
- C. ✅ CORRECT – Eye level should be at the same height as the tooth for accurate shade assessment.
- D. ❌ A 45° lateral view introduces angular distortion and is not the recommended approach.
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