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Third-generation vs a second-generation LED curing light: effect on Knoop microhardness.

Richard B T Price1, Corey A Felix, Pantelis Andreou

  • 1Department of Dental Clinical Sciences, Dalhousie University, Halifax, Canada.

Compendium of Continuing Education in Dentistry (Jamesburg, N.J. : 1995)
|October 21, 2006
PubMed
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Third-generation LED curing lights offer broader spectral output, providing comparable hardness to second-generation lights. Some composites showed increased top surface hardness with the third-generation LED light.

Area of Science:

  • Dental Materials Science
  • Photopolymerization Technology

Background:

  • Second-generation LED curing lights offer a narrower spectral output.
  • Third-generation LED curing lights utilize multiple LEDs for a broader spectral output.

Purpose of the Study:

  • To determine the benefits of the broader spectral output of third-generation LED curing lights.
  • To compare the performance of third-generation LED curing lights against second-generation lights.

Main Methods:

  • A third-generation LED curing light was modified to operate in both second- and third-generation modes.
  • Twelve resin composites were irradiated for 20 seconds under controlled irradiance and energy density.
  • A spectroradiometer ensured consistent energy delivery for all specimens.

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Main Results:

  • Both second- and third-generation LED modes produced resin composites of comparable hardness (P <= .01).
  • The top surface of 7 out of 12 resin composites was significantly harder when cured with the third-generation LED light (P <= .01).

Conclusions:

  • Third-generation LED curing lights provide benefits, including comparable or improved surface hardness in resin composites.
  • The broader spectral output of third-generation LED lights is advantageous for dental photopolymerization.