The hell with creighton.
If they didn't invite you for an interview last year, then don't even bother flying out to Omaha and wasting your money.
Just withdraw your application. The reason is a lot of applicants for the fall 2007 cycle has already been selected or admitted in December. if you haven't been accepted to any dental schools yet, then stay on the line and go visit their campus for an interview. It doesn't guarantee you acceptance though. And if you visit creighton for an interview, and don't get accepted to their dental school, you've just wasted money flying to Omaha and wasted money for hotel fees.
A lot of the applicants creighton selects for their program are applicants from their undergraduate institute. I know this as a fact as my friend attended creighton for undergraduate, part of a bachelor/DDS program, and went straight to their dental program without any interviews or application process.