I believe it’s 80% match rate with 4-6 interviews.
The numbers vary per year, but in general 60% match first choice, 20% second choice, 12% third choice.
Dental Match | Statistics of the Match
natmatch.com
Where did you get the information that it's around 80% match rate with 4-6 interviews? Maybe I missed it, but I don't see any statistics that would imply this.