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Biofilm viability: chlorhexidine (CHX) significantly reduced the number of live bacteria compared to the negative control on polished (P, p = 0.0037) and on non-polished (NP, p = 0.0079) samples. Non-significant reduction of viability between hydroxyapatite nanoparticles-based solution (nHAP) and water samples was present on P (p = 0.9268) and NP (p = 0.1667) titanium discs.
