Abstract

Introduction: Recently, bulk-fill resin shave been introduced, wich can be used with a mono-incremental technique, shortening clinical time and offering a less sensitive technique. The purpose of this study was to evaluate the marginal stability of condensable composite resins by using incremental technique versus a bulk-fill resin with sonic activation. Material and method: Two Black's class II cavities preparations were performed on 16 healthy third molars. The overall dimensions and depth of cavities were standardized as follows: 3 mm wide, 2 mm deep and 1,5 mm of mesiodistal lenght at the occlusal box, and 3 mm wide, 4 mm deep and 1,5 mm of mesiodistal length at the proximal box. It was randomly determined to restore a preparation with condensable resin FiltekTM P60 (3M® ESPE-USA) using oblique incremental technique, while these cond preparation used SonicFillTM resin (Kerr-USA) with mono-incremental technique and sonic activation. These were thermocycled in methylene blue 1%, then cut in mesio-distal sense and analysed by optical microscope. The degree of penetration of the infiltrator agent in the oclusal cavosurface margin and gingival wall of both resins was measured. Fisher's exact test and a subsequent Mann-Whitney U test were performed. Results: The amount of infiltration in gingival cavosurface margin was significantly lower for FiltekTM P60 compared with SonicFillTM (p= 0.028). Discussion: Both techniques presented similar values of marginal stability in the oclusal cavosurface margin, however, resin FiltekTM P60 has greater stability in the gingival cavosurface margin.