It exists, but they have an enrollment of 0 students. I was interested in it as well until I found out that you actually take a year or two off of dental school to do the MBA. I think the GMAT is required as well. So it's really not a combo program. It would be the same as finishing your DDS and then going to a MBA program.
I've talked to several MBA grads and they all told me that it would be a waste of time for dentistry....too general and wouldn't be specific enough for our field. They said it'd be cheaper to just pay some MBA grad to help you out in the future.