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Energy dependent polymerization of resin-based composite.

Rolf H Halvorson1, Robert L Erickson, Carel L Davidson

  • 13M Dental Products, St. Paul, MN, USA. rhhalvorson@mmm.com

Dental Materials : Official Publication of the Academy of Dental Materials
|July 6, 2002
PubMed
Summary

The radiant energy dose determines resin composite photopolymerization conversion. A reciprocal relationship exists between light intensity and exposure time, establishing a universal curing profile based on total applied dose.

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Area of Science:

  • Dental Materials Science
  • Polymer Chemistry
  • Photochemistry

Background:

  • Photopolymerization is crucial for resin-based composites.
  • Understanding factors influencing conversion is key for material performance.

Purpose of the Study:

  • To investigate the relationship between applied radiant energy (dose) and the extent of polymerization in resin-based composites.
  • To determine if a reciprocal relationship exists between light intensity and exposure time.

Main Methods:

  • Fourier Transform Infrared Spectroscopy (FTIR) measured 5-min and 24-h conversion.
  • Four resin composites were polymerized using a tungsten halogen light under varying intensity and exposure time conditions.
  • Samples were tested at constant exposure time with decreasing intensity and constant dose with varying intensity/time.

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Main Results:

  • Curing profiles showed conversion decreasing with energy, followed by a rapid drop.
  • Fractional conversion relative to maximum 24-h values revealed similar 5-min and 24-h curing profiles across materials.
  • Equivalent doses yielded similar conversion, indicating a reciprocal relationship between irradiance and exposure time.
  • Statistical equivalence was observed for most time/intensity combinations within a given dose.

Conclusions:

  • A reciprocal relationship between exposure time and power density is significant for understanding conversion as a function of applied dose.
  • This relationship establishes a universal curing profile correlating exposure time and power density.