Patricia Anderson is a librarian at University of Michigan who has posted several of her presentations on Web 2.0 and "eHealth" online. This one mentions a few Web 2.0 resources in dentistry and this makes it one of the few presentations on the subject.
David Rothman, who posted the slideshow, also links to DentalInformatics.com: a Virtual, Global Community for Anyone Interested in Dental Informatics.
The presentation is heavy on screenshots but I am happy to see it shows 2 projects I have been involved in: ClinicalCases.org and AskDrWiki.
Social Technologies for eHealth
Web 2.0 in Medicine Presentations by a University of Michigan Librarian. CasesBlog, 06/2007.
Web 2.0 and Medicine: The Slideshow. ScienceRoll, 02/2008.
Web 3.0 Concepts Explained in Plain English (Presentations). Digital Inspiration, 2009.