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Hematoxylin-eosin staining for histologic evaluation of the newly formed calcific barriers after 4 weeks (A–C) shows the aspects of the calcific barriers for each test material (scale bars = 150 μm) (D–F) show magnified view of the boxed region of (A–C) respectively (scale bars = 50 μm). ERRM-FS, EndoSequence Root Repair Material-Fast Set Putty.
