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The samples of radiographic study (Fig 1) were prepared for histology. Sagittal sections through the midline of defects are shown with hematoxylin and eosin stain. Arrowheads in left panel indicate margins of the trephine defect (X40; Bar, 1 mm). Right panel is the magnified images of box areas in left panel (X200; Bar, 0.1 mm).
