DMHI, Inc., the owner of the website, owns the copyrights to all of the content found on Dental-Picture-Show.com (both textual and visual). These copyrights have been formally registered with the United States Copyright Office.
While of course it is individuals who have actually created all of the content you see on Dental-Picture-Show.com their efforts are considered to be a product of their employment. In this instance copyright law states that the employer (DMHI, Inc.) is considered to be the "author" of the materials.
When citing a reference to content found on Dental-Picture-Show.com the following form would be appropriate: