A. B. Denis*, R. B. Viana**, and A. M. G. Plepis
Instituto de Química de São Carlos, Universidade de São Paulo, 13560-970, São Carlos - SP, Brasil
*e-mail: alinebdenis@yahoo.com.br
**e-mail: rommelbv@yahoo.com.br
Received February 8, 2012; published online May 11, 2012
Abstract—This paper evaluates the photopolymerization kinetics and degree of conversion of different com-
mercial dental composites when photoactivated by a LED curing unit using two different modes (standard and
soft-start mode). The investigation was performed on with RelyX ARC (dual-cured), Filtek Z-350 (Nanocom-
posite), Filtek Z-250 (Hybrid), and Filtek Z-350flow (Flowable) resin composites. The analysis used was atten-
uated total reflection with a Fourier transform infrared (ATR-FTIR). The RelyX ARC resin demonstrated the
highest degree of conversion with both LED photoactivation modes. For this resin a 28% decrease in maximum
rate was observed and the time to reach its highest rate was almost 2.3 times higher than when the soft-start
photoactivation light curing was used. Z-350flow resin recorder a higher maximum rate using the soft-start
mode rather than the standard mode. In contrast, the Z-250 showed a higher value using the standard mode.
Although Z-250 and Z-350 showed a higher total degree of conversion effectiveness using the soft-start mode,
RelyX and Z-350flow achieved a higher value using the standard mode.
DOI: 10.1134/S1054660X12060011
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