Sorption and Solubility of Two Direct Composites Heat Post-Cured

Objectives: This work evaluated the sorption and solubility, of two direct composites submitted a dry heat post-cured, storage in two solutions, by mass variations in differents periods. Methods: 80 specimens of two composites (FillMagic-Vigodent and TPH Spectrum-Dentsply) cured with halogen lamp Optilux 501 (600 mW / cm² - per 40s) were divided in four groups: G1) Heat post-cured/water; G2) Light cured/water; G3) Heat post-cured/alcohol and G4) Light cured/alcohol. The specimens had been made in a disc metal mould (7mm x 1mm) with filled the composite in unique increment and cured. After the removal the groups G1 and G3 were submitted a dry heat digital oven (Orion 520), during 5 min, under the temperature of 170°C. The groups G2 and G4 were the control. All groups were storage during 48 hours to stabilize the mass under 37ºC to obtain initial mass. Then, were kept in the solutions and weighted in periods of 1, 2, 3, 5, 7 and 14 days under a controlled temperature (37°C) to obtain the absorbed mass. After that, they were dried for 2 days, dissection with silica gel in a temperature of 37°C and weighted again to obtain the final mass. All specimens were weighted in Analytical Balance (Adventurer,Ohaus) for different periods. To calculate the sorption and solubility followed the specification ISO 4049. Results: All values were submitted ANOVA and Tukey's test (p<0,05). For all groups the values of (sorption/solubility) were respectively calculated in µg/mm³:G1(12,52/1,12), G2(10,41/ 0,66), G3(20,44/ 3,37), G4(10,49/1,56). The evaluated of sorption for two composites(p<0,023) and heat post-cured(p<0,018) were observed statistical difference significant. The storage solutions not were observed statistical differences(p<0,083). For the solubility the composite(p<0,000) and storage(p<0,011) were statistically significant and the heat post-cured didn't present differences. Conclusion: The influence of all conditions of each group showing difference statistically significant for sorption(p<0,016) and solubility(p<0,017).