Fig. 7.

In gp4-fl/TEF + TBF, the 2-mm-thick layer of the Tetric EvoFlow Bulk Fill (TEF) flowable liner has numerous large shrinkage vectors pointing toward the cavity floor, with the radiographic plane in the background (a, b). The top view reveals many shrinkage vectors pointing toward one side of the restoration (c). The second increment of Tetric EvoCeram Bulk Fill (TBF) displays small shrinkage vectors pointing downward toward the cavity floor (d, e). From the top view, the shrinkage vectors are directed toward the opposite side compared with those in the flowable liner layer (f). The shrinkage vectors are magnified by a factor of 10 for better visualization. The SEM images (at × 200 magnification) show perfect margins (g, k) but detachment from the cavity floor (h, i), where the detachment is between the TEF and the adhesive as well as between the adhesive and the dentin (h)