Polymerization kinetics of pre-heated composite

M. Daronch, F. A. Rueggeberg, M. F. De Goes, R. Giudici

Research output: Contribution to journalArticlepeer-review

155 Scopus citations


Temperature affects the polymerization behavior of dimethacrylate-based materials. This study describes the influence of pre-polymerization temperature and exposure duration on polymerization kinetics of a commercial dental photo-activated composite at the top and at 2-mm depth. We used the temperature-controlled stage of a diamond-attenuated-total-reflectance unit to pre-set composite temperature between 3° and 60°C. Composite was light-exposed by a conventional quartz-tungsten-halogen curing unit for 5, 10, 20, or 40 sec. Real-time conversion, maximum conversion rate (Rpmax), time to achieve Rpmax, and conversion at Rpmax were calculated from infrared spectra. Composite pre-warming enhanced maximal polymerization rate and overall monomer conversion (top significantly greater than 2 mm). Time when Rpmax occurred did not change with temperature, but occurred sooner at the top than at 2-mm depth. Conversion at Rp max increased with temperature, allowing more of the reaction to occur prior to vitrification than at room temperature.

Original languageEnglish (US)
Pages (from-to)38-43
Number of pages6
JournalJournal of Dental Research
Issue number1
StatePublished - Jan 2006


  • Curing temperature
  • Kinetics
  • Monomer conversion
  • Polymerization rate
  • Resin composite

ASJC Scopus subject areas

  • General Dentistry


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