Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Superficial morphology acquired by SEM and by AFM of nanotubular surfaces before ((a)—SEM, scale bar—4 μm and (c)—AFM) and after ((b)—SEM, scale bar—5 μm and (d)—AFM) saliva interaction for 10 min. Small impurities (red arrows) can be observed after saliva exposition (c); however, no significant morphological alteration on the nanotubular surface could be detected.
