Hi DTE, I am a junior at UAB. I can honestly say that the school is truly top-notch. I have been thoroughly impressed with the program and faculty. Of course, there are frustrations here and there, just like at any school, but overall I have had a very good experience.
As far as the interview goes, it is conducted by the admissions committee as a group. I think there are 4 dentists and a senior student on the cmte. They interview each candidate individually after a school tour and lunch. I would say it was fairly low-stress. My impression is that the cmte. just wants to get to know what type of person you are and assess your communication skills and interest in the profession.
If you have any more specific questions, I am more than happy to answer them as best I can. Good luck!