Rank lists might be made the day of the interviews however the rank list is not due for submission until much later. If a phone call were received by a PD indicating a candidate was outstanding or committed an ethical violation at their dental school, that could change the rank list.
Nothing is final until the deadline. A sincere thank you might help or make no change to your rank. If you interview for a job, and are highly interested in that position, would you send a thank you as a follow up?