Purpose: To study the rate of curing, three composites, Heliomolar (Vivadent), Z100 (3M), and Renew (Bisco) were investigated
Methods: Volumetric shrinkage was measured at 25 degrees C using the Acuvol with an RG610 red filter. The dynamic measurements were made in the single view mode.
Results: Detailed kinetic studies for Renew determined the effect of varying the light intensity (100mW - 500mW) and irradiation time (3 seconds - 30 seconds) on the rate of curing. A measurement of the gel time of composites and a kinetic constant is reported. ANOVA followed by a Fisher's LSD test and a Kruskall-Wallis test were used for analysis of the data. The gel times follow the order of Heliomolar > Renew > Z100 at 20 seconds and 500 mW. Irradiation time had no significant effect on the gel time of Renew. Light intensity had a significant effect on the gel time of Renew.
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