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) Influence of 3D rendering mode. Mono 3D shows significantly lower eye-tooth distance than stereo 3D. (a) Influence of hand-tool alignment. Alignment shows significantly lower eye-tooth distance than misalignment. (***: p < 0.001).
