Avaliação in vitro da microinfiltração em cavidades de classe V restauradas com diferentes combinações de resina composta e cimento de ionômero de vidro

The purpose of this study was to compare the microleakage of class V restorations using different combinations of glass ionomer/composite resin. Fifty cavities were prepared on the buccal and lingual aspects of recently extracted premolars and canines. The gingival margins of the preparations were extended into the cementum, and the occlusal margins were kept at the enamel level. The teeth were then divided into five groups and restored as follows: resin-modified glass ionomer cement restorative materials (Fuji II LC and Vitremer); composite resin/adhesive system (Scotchbond Multipurpose/Silux Plus); sandwich technique using the same composite resin/adhesive system and a resin-modified glass ionomer cement liner material (Vitrebond and GC Lining LC). The teeth were stored in distilled water, finished and thermocycled prior to immersion in a 2% basic fuchsin solution. The depth of dye penetration was scored and the results analyzed using Kruskal-Wallis and Wilcoxon Tests. The results revealed no significant differences between any of the groups for both cervical and occlusal margins.