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Representative SEM micrographs of A) IPS d.SIGN and B) Vita Titankeramik at 0, 4 and 60 min time points of APF gel exposure (x500 and x5,000 magnification). Note that the 60 min exposure showed an aggressive effect on the surface of the two ceramics, but this effect was less evident for single-phase high crystalline content Vita Titankeramik
