Restorative & Materials · single question
When is the BEST time to evaluate tooth shade for a crown or restoration?
Show answer and explanation
Correct answer: B. At the BEGINNING of the appointment, before any tissue dehydration
B) Beginning of appointment — CORRECT.
Shade selection must be done at the BEGINNING of the appointment because: (1) prolonged air exposure dehydrates teeth, making them appear lighter/brighter than their true shade; (2) the patient should not yet be draped with colored materials that affect color perception; (3) adjacent teeth should be moist and natural. After extended dental procedures, the tooth's appearance changes significantly.
A) After provisional: Too late — dehydration and altered tissue state affect shade perception.
C) After removing old restorations: Dentin may be exposed and dehydrated, affecting shade reading.
D) Any time — incorrect; lighting conditions and tooth hydration critically affect shade evaluation.
Shade selection must be done at the BEGINNING of the appointment because: (1) prolonged air exposure dehydrates teeth, making them appear lighter/brighter than their true shade; (2) the patient should not yet be draped with colored materials that affect color perception; (3) adjacent teeth should be moist and natural. After extended dental procedures, the tooth's appearance changes significantly.
A) After provisional: Too late — dehydration and altered tissue state affect shade perception.
C) After removing old restorations: Dentin may be exposed and dehydrated, affecting shade reading.
D) Any time — incorrect; lighting conditions and tooth hydration critically affect shade evaluation.
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