Objective: The aim of this study was to evaluate the influence of different crowns finishing line location on the crown tensile bond strength, marginal adaption and nanoleakage. Material and Methods: Sixty healthy third molars were collected. For tensile bond strength, a self-adhesive resin cement was used. For marginal adaption, epoxy resin models were prepared. Prior to tensile bond strength test, images for the epoxy resin models were measured under scanning electron microscopy (SEM). Nanoleakage was measured using same protocol. Failure mode was evaluated through SEM and classified: adhesive failure, cohesive in cement, cohesive in dentin, cohesive in resin composite, cohesive in enamel, and mixed. Statistical analysis was performed using Shapiro-Wilk and Kolmogorov Smirnov normality tests, two-way ANOVA, Bonferroni (posthoc) parametric test, with significance level of 5% (P < .05), Spearman correlation test. Results: tensile bond strength was not statistically different between the cemented groups with composite resin and ceramic. Cementation of ceramic was not statistically different between the groups (enamel, 3.28 Pa; dentin, 3.14 Pa; resin, 2.85 Pa). Marginal adaption was statistically different between resin and ceramic; finish line location varied between enamel and resin (175.91 μm vs. 433.58 μm). Nanoleakage rate was statistically different among all groups, except for resin: with resin (9.49%) and ceramic (9.35%). There was a predominance of adhesive failure in all groups. Conclusion: finish line location can be performed safely in enamel and dentin. Composite resinas substrate present an alternative, but still need to be more studied. Regarding the crown’s material, it is possible to perform a satisfatory restoration in both: resin and ceramic. With ceramics presenting better results. KEYWORDSResin composite; Ceramics; Tensile bond strengh; Marginal adaption; Nanoleakage.

Resumo O objetivo neste estudo foi avaliar a biodegradação de infiltrantes experimentais com diferentes tipos e concentrações de partículas bioativas, através de avaliações de rugosidade (Ra). A partir de uma formulação base composta de BisEMA e TEGDMA foram adicionadas partículas de hidroxiapatita (Hap); fosfato de cálcio amorfo (ACP); biovidro dopado com Zn (BAG-Zn) e partículas de cimento de silicato de cálcio modificado por β-tricálcio fosfato (β-TCP). As partículas foram adicionadas nas concentrações de 1%, 5% e 10% em peso. No grupo controle não foram adicionadas partículas. Cinco discos (5mm de diâmetro X 1mm de espessura) de cada material foram confeccionados e a rugosidade avaliada antes e após biodegradação por 7 dias de contato com o biofilme artificial de Streptococcus mutans. Os dados foram avaliados por ANOVA de medidas repetidas e teste de Tukey (α=5%).

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A localização do término marginal em coroas cimentadas é um fator que influencia a resistência à tração, adaptação marginal e nanoinfiltraçãoThe finish line location of the cemented crown is an influencing factor for tensile bond strength, marginal adaption and nanoleakage Piracicaba Agradecimentos Ao Prof. Dr. Luis Roberto Marcondes Martins, pela orientação durante toda a pesquisa desenvolvida. Por todo ensinamento e orientação. Agradeço também ao meu amigo Rodrigo Barros Esteves Lins, pela ajuda e orientação durante toda a pesquisa. À Faculdade de Odontologia de Piracicaba, na pessoa do seu Diretor Prof. Dr.