Fig. 4

SEM images of cross-sections of IRM exposed to various environmental conditions: (A1 - B1) after 4 days setting with PBS (pH 7.4); (A2 - B2) after 14 days setting with PBS (pH 7.4); (A3 - B3) after 4 days setting with butyric acid (pH 5.4); (A4 - B4) after 14 days setting with butyric acid (pH 5.4); and (A5 - B5) after 4 days setting with butyric acid (pH 5.4) followed by 10 days setting with PBS. (A1 - A5, × 500 magnification). (B1 - B5, × 3,500 magnification). Abbreviations: IRM: intermediate restorative material; PBS: phosphate-buffered saline; SEM: scanning electron microscope