Cells counting procedure - photomicrographs of the Neubauer Chamber on inverted phase microscope. Live cells appear in suspension, colorless and bright (refractile) under phase contrast (arrow). Dead cells, non-viable, are stained with Trypan Blue and are non-refractile. (a) Control group, (b) sealer 26, (c) Endofill, (d) AH Plus and (e) Biosealer (×100)
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