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.
A) Positive Control: In the absence of obturation, note how the Indian ink shows maximum filtration along the root canal. Original magnification 4.5x. B) Negative Control: With obturation and one impermeable varnish layer, observe how the Indian ink does not infiltrate anywhere along the root canal. Original magnification 4.5x.
