Microdureza de resina composta polimerizada com LEDs de diferentes gera es e luz halógena

Clinical performance of composite resins is closely related to the quality of the polymerization process. The purpose of this study was to evaluate the microhardness of a composite resin when polymerized by three different light sources (Conventional/halogen - Visilux2, 3M; First generation LED - Optilight Plus, Gnatus and Third generation LED - Radii, SDI). Thirty sampleswere prepared made of Filtek Z250 A2 composite resin (3M-Espe) and divided into three groups. Samples were subjected to microhardness test and results shown in Vickers scale, at the top and the bottom of each sample. Statistical analysis showed that samples cured with fi rst generation LED presented the lowest values for Vickers hardness, either at the top or the bottom. In conclusion, it is possible to observe that third generation LED and halogen lamps are effective as curing units, presenting similar results in microhardness tests.