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As restaurações de amálgama sofrem hoje uma série de questionamentos em relação a presença de mercúrio na sua composição e ligas alternativas foram desenvolvidas para a substituição desse material. Neste estudo avaliamos a infiltração marginal de duas ligas de amálgama (com mercúrio e com gálio) conjuntamente com dois sistemas adesivos (PAAMA e Scotchbond Multi-Uso Plus) em cavidades de classe V (margens em esmalte e cemento). Foram utilizados dentes humanos que após serem restaurados foram termociclados (500 ciclos, 5ºC-55ºC, 15 s em cada banho) e inseridos em corante (azul de metileno) e então desgastados e avaliados. Os escores foram compilados e submetidos a análise estatística (teste de Kruskal-Wallis com significância de 1%). Baseados nos resultados encontrados, pode-se concluir que houve diferença significante entre os adesivos utilizados, sendo melhor o sistema Scotchbond Multi-Uso Plus, não havendo diferença estatística entre as ligas de amálgama e nem entre as paredes. Nowadays, there is an increasing concern about the presence of mercury in amalgam restorations, and alternative alloys were developed as substitutes for this material. In this study, the marginal leakage of two amalgam alloys (with mercury and with gallium) with two adhesive systems (PAAMA and Scotchbond Multipurpose Plus) were evaluated in class V cavities (margins in enamel and cement). Sound human teeth were restored and submitted to 500 cicles (5ºC-55ºC, 15 s in each wash) before immersion in dye ( methylene blue). The teeth were cut and evaluated. The scores were compiled and submitted to statistical analysis (Kruskal-Wallis test with 99% of confidence level). Based on the results, we can conclude that there was a significant difference between the utilized adhesives, and that the best performance was obtained by the Scotchbond Multipurpose Plus system. There was no statistical difference between the amalgam alloys nor between the tooth walls

Avaliação da infiltração marginal de restaurações de amálgama: mercúrio versus gálio