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.
Schematic representation. Exposed furcation lesion (E): (a) Class I: Incipient lesion. Horizontal attachment loss of 2 mm or less; (b) Class II: Horizontal attachment loss of 3 mm or more; (c) Class III: Total horizontal attachment loss (through and through).
