Comparison of the influence of curing times applied to composite resins cured with LED and incandescent light

The purpose of this work was to compare polymeric dental resins cured with halogen lamp and with light emission diode (LED) devices, using the grinding disk method customized for dentistry and the corresponding microhardness values. Tests were carried out on resin samples of five brands, which were cured for 10, 20 and 40 s with the two devices. The analysis of microhardness and aggressiveness has allowed us to conclude that there is no correlation between these properties. In Microhardness tests, the material heterogeneity has produced relative hi h standard deviation values and has 4 9 not shown statistical differences between the analyzed samples. In the statistical analysis for the results with the Grinding disk method, the resin with highest wear was the Tetric Ceram, cured with LED device for 10 s (aggressiveness average 0.170 mm(3)/N.m). The composite resin with least wear was Charisma, cured with halogen lamp device for 20 s (aggressiveness average 0.057 mm(3)/N.m).