Effect of light activation method on flexural properties of dental composites

Jack L. Ferracane, Lucas L. Ferracane, Lawrence Musanje

Research output: Contribution to journalArticlepeer-review

26 Scopus citations


Purpose: To determine if irradiating composites in a laboratory tungsten-halogen light-curing unit produced equal flexural properties to stepwise hand-curing with a tungsten-halogen lamp. Methods: Bars (n=10) of nine commercial composites were formed by light-curing in square glass tubes (2 x 2 x 25 mm). Flexure strength (FS, MPa) and flexure modulus (FM, GPa) were tested in three-point bending after aging specimens in water at 37°C for 1 day. Two methods were used to irradiate the composites: a) Triad II (Dentsply) using 40-second exposures from top and bottom; and b) Optilux 400 (Demetron; 600 mW/cm2) using 3 x 40 seconds overlapping exposures from the top only. Filler wt% was determined by thermal gravimetric analysis. The degree of conversion (DC) of each composite cured with the two techniques was evaluated by micro-FTIR. T-tests were performed for FS and FM to compare Triad II vs Optilux for each composite (α< 0.05). Results: There was a trend for Optilux to produce greater FS (significant for A110, Herculite and P60) and FM (significant for all but Clearfil, Esthet-X and Z250), but differences averaged less than 10%. There was no difference in DC between the irradiation modes for any composite.

Original languageEnglish (US)
Pages (from-to)318-322
Number of pages5
JournalAmerican journal of dentistry
Issue number5
StatePublished - Oct 2003

ASJC Scopus subject areas

  • Dentistry(all)


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