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Related Experiment Videos

Polymerization efficiency of LED curing lights.

Daniel L Leonard1, David G Charlton, Howard W Roberts

  • 1USAF Dental Corps, USAF Dental Investigation Service, Great Lakes, Illinois, USA.

Journal of Esthetic and Restorative Dentistry : Official Publication of the American Academy of Esthetic Dentistry ... [Et Al.]
|October 31, 2002
PubMed
Summary
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First-generation LED curing lights showed lower efficiency than quartz tungsten halogen lights for dental composites. Longer exposure times were needed for adequate polymerization with LED technology, impacting clinical application.

Area of Science:

  • Dental Materials Science
  • Photopolymerization Technology
  • Biomaterials Engineering

Background:

  • Dental resin composites require light curing for polymerization.
  • Quartz tungsten halogen (QTH) lights have been traditionally used, but light-emitting diode (LED) technology offers potential advantages.
  • Comparing the curing efficiency of different light sources is crucial for optimizing clinical outcomes.

Purpose of the Study:

  • To compare the curing efficiency of three commercial LED curing lights against a QTH light using hardness testing.
  • To analyze the power density and spectral emission of LED and QTH lights within specific wavelength ranges.

Main Methods:

  • Depth-of-cure specimens were prepared using two composite types (microfill and hybrid) and four curing lights (3 LED, 1 QTH).

Related Experiment Videos

  • Knoop hardness measurements determined bottom/top Knoop hardness (B/T KH) percentages after 24 hours.
  • Power density and spectral emission (380-520 nm and 450-500 nm) were measured for each light source.

    • Main Results:

    • LED lights' emission spectra better matched the photoinitiator camphorquinone absorption spectrum (450-500 nm).
    • Despite better spectral match, LED lights required significantly longer exposure times (39-131 seconds) compared to the QTH light (21-42 seconds) for adequate polymerization.
    • QTH light exhibited higher power density between 450-500 nm than the tested LED lights.

    Conclusions:

    • First-generation LED curing lights demonstrated lower polymerization efficiency than the QTH light for both hybrid and microfill resin composites.
    • Longer exposure durations are necessary with these LED lights, potentially impacting clinical chairside time.
    • Further advancements in LED technology are needed to match or exceed the performance of QTH lights in dental applications.