dental specific research is hard to come by as an undergrad, as wayne said. i know, i've tried it. but it doesn't really matter, any medically-related research should have some relation (biochemical, cell bio, etc.) level to something dental. for instance, orthopedic research and bone growth (relates to prostho/jaw stuff), or microbio research (relates to prevalence of bacteria in oral cavity). you get the picture, just get yourself out there (if you have the genuine interest). best way is to volunteer your services for awhile, then once your foot is in the door, you can ask for more responsibilities or pay.