Restorative & Materials · single question
Which shade takes the longest time to light-cure due to its optical properties?
Show answer and explanation
Correct answer: A. D3 (dark, brown-gray shade)
- A. Correct. DARKER shades of composite (especially those with more pigmentation like D3, A4, B4) absorb more light and require LONGER cure times. Dark pigments block light penetration, reducing the depth of cure. Among the shade guide options presented, D3 (a dark brownish-gray shade) would take the longest to light-cure.
- B. C1 is a medium shade — cures faster than D3.
- C. B1 is a very light shade — it light-cures quickly.
- D. Light shades (A1, B1) cure the quickest — they transmit light more readily through their less opaque structure.
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