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Related Experiment Videos

Evaluation of a second-generation LED curing light.

Richard B T Price1, Corey A Felix, Pantelis Andreou

  • 1Department of Dental Clinical Sciences, Dalhousie University, Halifax, Nova Scotia. rbprice@dal.ca

Journal (Canadian Dental Association)
|November 13, 2003
PubMed
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Second-generation LED curing lights show promise for resin composites. While not universally superior to quartz-tungsten-halogen lights, a 40-second LED exposure achieved comparable hardness in most composites.

Area of Science:

  • Dental Materials Science
  • Polymer Chemistry
  • Photopolymerization Technology

Background:

  • Light-emitting diode (LED) curing lights offer advantages over traditional quartz-tungsten-halogen (QTH) lights.
  • First-generation LED lights presented certain limitations in performance.

Purpose of the Study:

  • To compare the efficacy of a second-generation LED curing light with a QTH light.
  • To evaluate photopolymerization of various resin composites using different curing light technologies.

Main Methods:

  • Ten resin composites were cured using a second-generation LED light (20 and 40 seconds) and a QTH light (40 seconds).
  • Irradiation was performed at 2 mm and 9 mm distances on 1.6 mm thick specimens.
  • Knoop hardness was measured at the top and bottom surfaces at 15 minutes and 24 hours post-irradiation.

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Main Results:

  • Curing light type and irradiation time significantly affected composite polymerization (p < 0.01).
  • At 24 hours, the LED light (20s) matched QTH (40s) hardness in 5 composites (p > 0.01).
  • The LED light (40s) matched QTH (40s) in 6 composites, with all achieving >80% QTH hardness.

Conclusions:

  • The tested second-generation LED light did not fully match QTH light performance across all resin composites.
  • However, with a 40-second exposure, the LED light demonstrated comparable efficacy to QTH for over half the composites.
  • All tested composites exhibited hardness levels comparable to those achieved with the QTH light when using the LED for 40 seconds.