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Light intensity decay in quartz-tungsten-halogen polymerization units.

Khalid H Al-Samadani1, Al-Dharrab Ayman, A Wahbi Mohammed

  • 1Department of Restorative Dental Science, College of Dentistry, Taibah University, Al Madinah Al Munawwarah - 43353, Kingdom of Saudi Arabia.

Journal of International Oral Health : JIOH
|October 25, 2013
PubMed
Summary

Age significantly reduces the light intensity of quartz-tungsten-halogen (QTH) polymerization units, impacting dental restoration quality. Regular maintenance is crucial for maintaining optimal light output in dental clinics.

Keywords:
IntensityLight unitPolymerizationQuartz-tungsten

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Area of Science:

  • Dental Materials Science
  • Biomaterials Engineering

Background:

  • Quartz-tungsten-halogen (QTH) polymerization units are widely used in dentistry for curing resin-based composites.
  • The light intensity output of these units can degrade over time, potentially affecting restoration efficacy.

Purpose of the Study:

  • To investigate the effect of aging on the light intensity of QTH polymerization units in dental settings.
  • To assess the current light intensity levels and their correlation with unit age.

Main Methods:

  • A calibrated radiometer was used to measure the light intensity of 171 QTH units across two dental schools and multiple dental clinics.
  • Data on unit age, manufacturer, model, and service history were recorded.

Main Results:

  • The mean light intensity of the tested QTH units was 373.1 mW/cm², with a wide range (95.3–526.60 mW/cm²).
  • A statistically significant relationship (P = 0.001) was found between the mean light intensity and the age of the units.
  • A substantial number of units exhibited light intensity below recommended levels for optimal polymerization.

Conclusions:

  • Light intensity from QTH polymerization units diminishes with age, potentially compromising resin-based composite restorations.
  • Dentists' awareness and commitment to the maintenance of QTH units are vital for ensuring optimal dental restoration properties.