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.
Mean scores of four observers showing the performance of panoramic films and unfiltered and filtered storage phosphor plate (SPP)-based digital panoramic images for the perception of low-contrast anatomical structures; RCS, root canal space; PDL, periodontal ligament space
