Avaliação in vitro da infiltração marginal em cavidades classe II restauradas com resinas do tipo bulk-fill

Abstract

Introduction: A new concept of composite resins has surged in recent years, in order to simplify the application and reduce the working time. Bulk-fill resins offer possibility to work using increments of up to 05 mm. Objective: The aim of this study was to evaluate the marginal in vitro leakage in Class II cavities of 40 human third molars with cervical termination in enamel and dentin. Material and method: Cavities were restored with Filtek Bulk Fill (3M ESPE), Aura Bulk Fill (SDI) and Oppus Fill APS (FGM) and compared with conventional Filtek Z- 350 XT (3M ESPE). The samples were submitted to mechanical efforts, consisting of 500,000 ciclos. Marginal leakage was evaluated using stereoscopic glass magnifier 10x and 40x, after immersion in solution of 1% methylene blue after 24 hours and used an image analysis software which allowed to determine the percentage of marginal infiltration of the preparations. Results: The data were recorded and submitted to statistical analysis for evaluation and it was verified that there were no significant differences in the marginal infiltration between the margins in enamel and dentin (p = 0.244). Regarding resin types, there were significant differences between them, observed only in the enamel (p = 0.004) and in dentin, no significant differences were observed in the marginal infiltration between the resins (p> 0.05). The Filtek BulkFill and Aura Fill resins were similar to each other in enamel, presenting higher infiltration than Filtek Z350 XT resin and Oppus Bulk Fill. The absence of statistically significant differences between the conventional resin and the Bulk-fill resin group in the dentin microleakage measurements suggest that the formulations for application in large increments achieved the sealing ability similar to the conventional nanoparticulate resin Z350 XT, implying that the economy of time and simplification allowed by the technique of filling in large increments (Bulk-fill) did not affect the quality of the toothrestoration interface.