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This study evaluated the marginal sealing of composite resin restorations in bovine teeth by utilization of the microleakage test, according to light curing. Sixty bovine teeth received box type preparations and were divided into five groups with 12 teeth each. After acid etching and application of the Single Bond (3M ESPE) adhesive, the teeth were restored with the composite resin Z250 (3M ESPE) in 2 increments, with variations in light curing, as follows: group 1, 600mW/cm2/30s with a XL3000 unit (3M ESPE); group 2, at 14mm –180mW/cm2/10s, 10-second interval and then 20s in contact with the resin at 500mW/cm2; group 3, with a progressive unit Jet Lite 4000 Plus (J. Morita) from 100 to 1400 mW/cm2, for 30s; group 4, LED unit (Led-Lec, MM Optics) at a power of 130 mW/cm2; and group 5, with a LED unit for bleaching ZAP LED – ZAP Lasers, at 600 mW/cm2. The specimens were thermocycled for 500 thermocycles (5oC-55oC), submersed in 50% silver nitrate solution for 24 hours, washed for 20 minutes and placed in radiographic developer for 8 hours, The teeth were selected and images were collected by a digital camera connected to a stereomicroscope and then analyzed by the Image Tool 3.0 software. Data were analyzed with the ANOVA and Tukey test (5%), which revealed that Jet Lite presented the highest statistically significant marginal microleakage values, and the other groups did not present significant differences, thus yielding the following decreasing sequence of marginal microleakage values: ZAP LED, conventional, two-step curing at distance and Low LED.

Interferência dos métodos de fotopolimerização na microinfiltração marginal de restaurações de resina composta