Effect of hydroxyapatite nanoparticles on enamel ...
2019-7-4 · curing unit (Coltolux, Coltene, Whaledent, Altstaetten, Switzerland) at a power density of 550mW/cm2 for 40s. Group 2 (nano-HA 0.15%): After the enamel was etched as described above for group 1, each sample was immersed in 5mL of a solution that contained 0.15% nano-HA in a closed glass vial with continuous slow
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