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Restorative & Materials · single question

At which wavelength range does the camphorquinone photoinitiator cure composite resin?

  1. >800 nm (infrared)
  2. 200–300 nm (UV)
  3. 600–700 nm (red)
  4. 400–500 nm (blue light, ~468 nm)
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Correct answer: D. 400–500 nm (blue light, ~468 nm)

  • A. Incorrect – infrared does not activate the photoinitiator.
  • B. Incorrect – older UV systems were abandoned for safety/penetration; modern curing is visible blue light.
  • C. Incorrect – outside camphorquinone's absorption peak.
  • D. Correct – camphorquinone absorbs maximally around 468 nm (blue visible light), the basis for LED/halogen curing lights.

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