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Elements of light-cured epoxy-based dental polymer systems

F Millich1, L Jeang, J D Eick

  • 1Department of Chemistry, University of Missouri-Kansas City, 64110, USA.

Journal of Dental Research
|April 16, 1998
PubMed
Summary

Researchers explored epoxy- and spiro-orthocarbonate (SOC)-based resins to reduce polymerization shrinkage in dental composites. Optimizing resin components achieved clinically relevant cure times for visible-light-cured dental materials.

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Area of Science:

  • Dental Materials Science
  • Polymer Chemistry

Background:

  • Polymerization shrinkage is a significant challenge in current dental composite systems.
  • Developing novel resin systems is crucial for improving dental restorative materials.

Purpose of the Study:

  • To investigate the cure characteristics of visible-light-cured epoxy resin systems.
  • To test the hypothesis that co-reactant and activator types/concentrations govern cure behavior.

Main Methods:

  • Formulation of epoxy and spiro-orthocarbonate (SOC)-based resins with onium salt initiators and thiozanthone sensitizer.
  • Curing resins using experimental visible-light irradiation and a commercial dental lamp.
  • Evaluation of cure times based on resin composition, including epoxy-polyol ratios and specific polyol types.

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Main Results:

  • Resins incorporating SOC exhibited extended cure times.
  • Optimal epoxy to polyol ratios for rapid curing were identified as 50:50 or 60:40.
  • Certain polyols, like TONE 305, facilitated faster curing compared to others or no polyol.
  • A specific resin mixture achieved clinically relevant cure times of 1-3 minutes with a commercial dental lamp.

Conclusions:

  • Careful manipulation of resin components can achieve clinically relevant cure times for visible-light-cured epoxy-based dental materials.
  • This study provides a foundation for developing advanced dental composites with reduced polymerization shrinkage.