Avaliação “in vitro” da infiltração coronária de materiais restauradores temporários em cavidades complexas classe II-mod submetidos à ação de termociclagem e forças mecânicas

Abstract

The aim of this study was to evaluate "in vitro", the coronal microleakage in complex cavities class II-MOD sealed with temporary filling materials, subjected to the action of thermal cycling and mechanical forces. Cavities MOD were prepared in 60 premolars extracted from humans who were divided into three groups according to the temporary restorative material (MRT) used: G1-IRM; Coltosol-G2, G3-Fill Magic Tempo. Three teeth served as negative control and had no cavities prepared. Before sealing the cavities with the MRT a collagen sponge was left in the pulp chamber to evaluate binary penetration of the dye. Ten specimens of each group were subjected to the action of thermal cycling and mechanical occlusal forces. Then, the whole sample was immersed in the dye Rhodamine B 0.5% at 37 ° C for a period of seven days to passive diffusion of the dye. In sequence, the temporary restorative materials were removed to evaluate infiltration in the collagen sponge. All teeth examined, except the negative controls showed infiltration by the dye, staining the sponge contained in the pulp chamber. All teeth sealed with Coltosol fractured after mechanical testing, while those with IRM and Fill Magic Tempo remained macroscopically intact. Could be concluded that none of the tested materials to prevent dye penetration. There was no correlation between the action or not of the thermocycling and mechanical loading in the dye penetration of the samples in this study.