Effect of therapeutic dose X rays on mechanical and chemical properties of esthetic dental materials
AUTOR(ES)
Cruz, Adriana Dibo da, Sinhoreti, Mário Alexandre Coelho, Ambrosano, Gláucia Maria, Rastelli, Alessandra Nara de Souza, Bagnato, Vanderlei Salvador, Bóscolo, Frab Norberto
FONTE
Materials Research
DATA DE PUBLICAÇÃO
2008-09
RESUMO
The aim of this study was to investigate the influence of therapeutic dose X rays on the microhardness (MH) and degree of conversion (DC) of two different esthetic restorative dental materials. The materials were photo-activated with a LED light-curing unit using three cure-times: 5, 20 and 40 seconds. The photo-activation was carried out in two distinct periods: before and after irradiation with doses of 5, 35 and 70 Gy, from a 6 MV X rays beam. In accordance with the methodology used, it was conclude that a therapeutic dose does not have a detrimental effect on the photoinitiator molecules, because the photo-activation occurred after they were irradiated. When the irradiation was applied before photo-activation, the materials showed MH improvement, but when photo-activation was performed after irradiation, there was less improvement. However, there was no correlation between MH and DC. Thus, a therapeutic dose applied to cured material can promote linking and breaking of chain bonds in a non-linear way.
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