Influência da energia de fotoativação na microdureza Vickers de uma resina composta

Resumo (EN)

Introduction – This study had the purpose to verify the hardness in the opposite surface using a composite resin, Palfique Estelite® (J.Morita) it was cured for two different sources of the light, a conventional halogen light and a high intensity halogen. Material and Methods – For the samples were realized specimens with resin composite of the A3 shade, it was placed in polipropilen black molds with 4 mm in diameter and 1 mm in high, the specimens were prepared through of the increments until 2 mm in high. For the cure were used the LCUs (Light curing unit) Jet Lite® (J. Morita) with intensity of 800 mW/cm2 and Degulux® Soft Start (Degussa-HulsAG) with intensity of 300mW/ cm2. The samples were divided in 4 groups with 5 specimens for each. The group I and II were catered 16J by energy and group III and IV were catered 48J by energy. In each specimen were realized 5 indentations. Results – The Vickers hardness values were reduced to a arithmetic mean, whereby obtained 20 means values, that were submitted to Kruskal-Wallis’ test. The results showed to have differences statistically significant at a level 0.01. The comparison among the means showed that the G III (51.0 Kgf/mm2) was greater than G I (45.7 Kgf/mm2), with a significance level 0.01 and G IV (51.7 Kgf/mm2) was greater than G II (46.0 Kgf/mm2) and a significance 0.01. Conclusion – The increase of the energy density increased the Vickers hardness. The energy form available didn’t interfered with the Vickers hardness results, since the cure time/intensity (Binomy Control) get in proportion resulting in the same energy density.