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Back scatter scanning electron micrographs of hydrated (a and b) MTA Angelus, (c and d) Biodentine, (e and f) Theracal LC, (g and h) Apacal ART, (i and j) Endocem MTA at ×2000 and ×4000 magnification respectively. PO: Portlandite, CH: Calcium hydroxide matrix, CSH: Calcium silicate hydrate, RO: Radio-opacifier, UC: Unreacted cement, HR: Hydration rim, RM: Resin matrix, CP: Calcium phosphate, PZ: Pozzolan, ETR: Ettringite
