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.
Class II lever system with anterior MDI act as a fulcrum, posterior MDI act as a resistance and the power is the posterior dislodging force. Placement of posterior MDI create a resistance point; notice the long resistance arm resulting from widely placing MDIs improving the mechanical advantage.
