O objetivo deste estudo foi avaliar a capacidade de selamento marginal do cimento resinoso auto-adesivo Rely X U100 / 3M ESPE, recentemente introduzido no mercado. Trinta raizes de dentes bovinos com 14 mm de comprimento foram restauradas com cimento resinoso auto-adesivo e pinos pre-fabricados de fibra de vidro DC3 (Fiber post/ FGM). As raizes foram aleatoriamente divididas em tres grupos (n=10) de acordo com a tecnica de insercao do agente de cimentacao: G1 - Broca lentulo; G2 - Seringa Centrix e G3 - Tecnica Manual. Apos a cimentacao, foram confeccionadas restauracoes provisorias com resina composta (Opallis DA2/FGM) sem utilizacao de sistema adesivo. As raizes foram impermeabilizadas com esmalte de unha azul, deixando exposta a linha de uniao resina/dente. Em seguida, foram submetidas a ciclagem termica com 1000 ciclos entre 50 e 550C. Para o teste de micro-infiltracao, as raizes foram armazenadas em solucao de corante Rodhamina B por 24 horas. Apos este periodo, as raizes foram limpas e seccionadas no sentido longitudinal para avaliacao da infiltracao do corante. Os valores da infiltracao foram obtidos pelo metodo qualitativo (escores) e a analise estatistica foi realizada atraves do teste Kruskal-Wallis e tambem pelo metodo quantitativo (Image ToolR) e a analise estatistica realizada pelo teste ANOVA (one-way). Para ambas as analises, nao houve diferenca significativa entre as tecnicas de insercao do cimento resinoso auto-adesivo. Com base nos achados, a micro-infiltracao esteve presente em todos os grupos avaliados, e a tecnica de insercao nao influenciou o grau de micro-infiltracao marginal, tanto para a analise qualitativa como para a quantitativa.
The aim of this study is to evaluate the microleakage a self-adhesive cement recently marketed Rely X U100 (3M ESPE). Thirty roots of bovine teeth with 14 mm long were restored with selfadhesive cement and Glassix fiber post DC3 (FGM). Roots were randomly divided into three groups (n=10) according to the technique of placement of the cementing agent: G1 - Centrix syringe; G2 - Lentulo drill and G3 - Manual technical. After cementation, provisional restorations were fabricated with composite resin (Opallis/FGM) without the use adhesive system. After they were finished, polished and thermo cycled by 1000 cycles, in water at temperature of 5oC and 55oC, 30 seconds in each bath. For microleakage test each group of roots was immersed in recipients with Rodhamine B dye solution buffered at 2%, during 24 hours. After this time, the samples were washed in tap water, sectioned and evaluation of dye leakage. The values of infiltration were obtained by the qualitative method (scoring) and statistical analysis using Kruskal-Wallis test and also by the quantitative method (Image Tool) and statistical analysis using ANOVA one way. For both tests, no significant difference between the techniques of placement of the self-adhesive cement. Based on these findings, micro-infiltration was present in all groups, and the placement technique did not influence the degree of micro-leakage, both for the qualitative analysis as to the quantitative.
