Avaliação in vitro do selamento marginal de restaurações classe II com resina composta utilizando-se diferentes sistemas adesivos: comparação do efeito de duas soluções evidenciadoras

Abstract

Here we evaluated in vitro the marginal sealing of class II restoration with composite resin using three different adhesive systems by comparing the penetration of two solutions evidenced. Sixty human molars were used, in which were made cavities as vertical slots with gingival ending below the enamel-cementum junction. The teeth were randomly divided into three groups according to the adhesive system to be used (n=20): Group A: Adhesive System Sctchbond Multi Purpose, Group B: Adhesive System Adper Easy One and Group C: Adhesive System Clearfil SE Bond. The cavities were restored with composite resin Filtek Z350, witch was introduced in the cavity by an incremental technique. The bodies of evidence were submitted to term cycles of 1500 cycles of 5ºC + 2ºC e 55ºC+ 2ºC of temperature in alternated baths of 30 seconds each. After, each group was divided into two subgroups according to the solutions evidenced to be used. The body of evidence from the subgroup 1 was kept immersed in the contrast for 24 hours in a solution of ammoniacal silver nitrate, then immersed in a radiographic disclosing developer for 8 hours and exposed to fluorescent light. The subgroup 2, remained immersed in a solution of methylene blue of 2% for 24 hours. They were cut on the mesial-distal direction and the marginal microleakage was evaluated by two observers using a stereomicroscope. The results were submitted to a statistic analysis using the Kruskal Wallis Test and with the Mann-Whitney (p=0,05). The conclusion is that no adhesive system tested was meaningfully effective on the marginal sealing in restorations class II with composite resin. A bigger penetration of the solution of methylene blue at 2% indicating that the kind of contrast used can interfere with the research results. Other studies must be done in order to verify which is the best 17 concentration and the best time of immersion for the contrast used on the marginal microleakage.