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) Occlusal view and (b) buccal view of a typical fracture pattern of the glass-ceramic materials (indentation load of 475 N at 220,000 loading cycles). (c) Occlusal view and (d) section view of a glass-ceramic crown (indentation load of 550 N at 250,000 loading cycles) exhibiting extensive crack formation.
