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Related Experiment Videos

Decrease in power output of new light-emitting diode (LED) curing devices with increasing distance to filling

Gerrit R Meyer1, Claus-Peter Ernst, Brita Willershausen

  • 1Department of Operative Dentistry, Johannes Gutenberg University, Mainz, Germany. gemeyer@mail.uni-mainz.de

The Journal of Adhesive Dentistry
|April 2, 2003
PubMed
Summary

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Blue light-emitting diode (LED) curing devices show a greater power output decrease with distance than quartz-tungsten-halogen (QTH) devices. This suggests LED devices may not adequately cure resin composites at clinically relevant distances.

Area of Science:

  • Dental Materials Science
  • Photopolymerization Technology

Background:

  • Dental curing devices are essential for polymerizing resin composites.
  • Light-emitting diode (LED) and quartz-tungsten-halogen (QTH) technologies are prevalent curing methods.
  • Understanding light output decay with distance is crucial for effective clinical use.

Purpose of the Study:

  • To compare the percentage decrease in power output of LED and QTH curing devices.
  • To evaluate power density reduction at varying distances from the light guide tip.

Main Methods:

  • Three LED (Elipar FreeLight, Luxomax, e-Light) and two QTH (Elipar TriLight, Optilux 501) curing devices were tested.
  • Power density was measured using a Fieldmaster GS radiometer at 1-mm increments from 0 to 20 mm.
  • Measurements were repeated six times for each device (n=6).

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Main Results:

  • At 10 mm distance, power output decreased by 68% (FreeLight), 83% (e-Light), 42% (Luxomax), 38% (TriLight), 33% (Optilux standard), and 44% (Optilux turbo).
  • The Luxomax LED device exhibited 40% lower power density at 0 mm compared to other LED devices.
  • Significant power output reduction was observed for LED devices at increased distances.

Conclusions:

  • Blue LED curing devices demonstrated a significantly higher percentage decrease in power output at 10 mm compared to QTH devices.
  • While effective at contact, LED devices may not ensure sufficient polymerization at clinically relevant distances.
  • Clinical application of LED curing devices requires consideration of light intensity decay with distance.