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Synthesis of Programmable Main-chain Liquid-crystalline Elastomers Using a Two-stage Thiol-acrylate Reaction
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Published on: January 19, 2016

Time-dependent conversion of a methacrylate-based sealer polymerized with different light-curing units.

Nilufer C Beriat1, Atilla Ertan, Zafer C Cehreli

  • 1School of Dental Technology, Hacettepe University, Ankara, Turkey.

Journal of Endodontics
|December 17, 2008
PubMed
Summary

This study found that Epiphany sealer showed incomplete polymerization, with conversion improving slightly over 15 days. Neither the light-curing unit type nor distance significantly impacted conversion, but time did.

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Area of Science:

  • Dental Materials Science
  • Polymer Chemistry
  • Biomaterials Engineering

Background:

  • Methacrylate-based sealers are widely used in endodontics.
  • Incomplete polymerization can compromise sealer performance and longevity.
  • Understanding factors influencing sealer conversion is crucial for clinical success.

Purpose of the Study:

  • To evaluate the degree of conversion of Epiphany sealer.
  • To assess the influence of photoactivation method, light-curing unit (LCU) distance, and post-curing time.
  • To determine the impact of these variables on sealer polymerization.

Main Methods:

  • Epiphany sealer was photoactivated using quartz tungsten halogen and light-emitting diode LCUs.
  • Degree of conversion was measured using Fourier transform infrared spectroscopy at coronal, middle, and apical locations.
  • Measurements were taken before and after photoactivation, and at intervals up to 15 days.

Main Results:

  • Initial conversion was approximately 50% post-photoactivation.
  • Conversion increased by about 10% after 15 days.
  • LCU type and distance did not significantly affect conversion (p > 0.001), but time showed a significant increase (p < 0.001).

Conclusions:

  • Epiphany sealer exhibits incomplete polymerization even after extended in vitro post-curing.
  • Clinical implications suggest potential long-term performance limitations.
  • Further research into optimizing photoactivation protocols for methacrylate-based sealers is warranted.