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SEM micrographs of the surface morphology of (a) untreated MTA, (b) MTA etched with self-etch primer showing eroded areas (arrow), (c) PDA-pretreated MTA and (d) PDA-pretreated MTA surface etched with self-etch primer
SEM: Scanning electron microscope, MTA: Mineral trioxide aggregate, PDA: Polydopamine
