Braga SSL, et al. - This study was performed to assess the impact of flowable bulk-fill or conventional composite resin on bond strength and stress distribution in flat or mesio-occlusal-distal (MOD) cavity preparations utilizing the microtensile bond strength (μTBS) test. According to the outcome obtained, flowable bulk-fill (FBF) composite resin had lower shrinkage stress than Z350 conventional composite resin. The μTBS of the MOD preparation was influenced by the composite resin type. Flat cavity preparations had no impact on stress and μTBS. However, for MOD preparation, composite resin with higher shrinkage stress resulted in lower μTBS values.