What are you interested in getting a PhD in? Justr from the admissions requirement book, I noticed that there were schools that offered PhDs in Oral Biology. I think there is a lot of funding available to do dental research, and have you noticed how dental schools always stress research?
I *think* UCSF is trying to get a program started for a PhD in bioengineering as well. Just from my (uneducated) opinion, I think schools with a large medical center or a large university near by may let to cross-register to do your research at another institution (if you are looking at bioe). I know that this happens with a medical school near my university, so I don't think it's a big leap for dental schools to start accomidating interested students as well.
I haven't really looked very much into this, but maybe some others have.
