Applying to OMFS residencies is an interesting game. You aren't really "accepted" into a program, but you are "matched" into a program. If and when your numbers are good enough to be granted an interview, then hopefully the residency will rank you high enough within their available seats for that particular residency. Lets say if you're ranked high enough within the number of seat available for that residency, then I would considered that being "accepted" (this is unofficial), but yet "matched"!
You see, there is no "acceptances" in the matching game. I figure that if the residency ranks you high enough, that would be an unofficial "acceptance", sort of like, they believe that you would be a good fit for their program. Even with that said, you're still not guaranteed to go to that program due to the matching process. Getting into an OMFS residency is not like getting into a dental school where an acceptance is offered and then you as the applicant decide if you want to attend. In OMFS residency applications process involving in match, there are no acceptances offered. How many non-match OMFS residency out there or which are non-match OMFS residencies, I have no clue! 😕
Now onto the "applied/acceptance" ratio statistics, that's tough to say. Only program directors will know that type of numbers. What do you consider as being "accepted"? Is it an acceptance when you get an interview? Is it an acceptance when you get ranked? Is it an acceptance only when you get ranked high within the number of seats available within that residency? You see, in the matching game, it is very difficult to define exactly what is an acceptance? When you're matched, now that is self-explanatory. You're matched, then you're matched. So I guess when we say, "getting accepted to an OMFS residency" is a bit ambiguous.
Currently there are no published statistical analysis on individual OMFS residency match results and/or the number of applicants applied. Again, only program directors know that kind of info. Since we're at it, we might as well clarfy that there are also no 1st-year statistics on the average class rank, GPA, and NBDE Part 1 scores of individuals who matched into individual OMFS residency.
I wish there were statistical publications like what they have for the dental schools, but unfortunately and traditionally, any info about an OMFS residency follows the "hush-hush" philosophy. The best way to find out about each and every individual OMFS program is to do an externship there and unfortunately, each dental student applicant can only do so much externships due to the lack of free time to participate.
Match results posted after each year's match is probably the best number stats we have at our disposal I'm afraid and that does not include the individual program's stats. There is individual program stats available in the match's website, but only program directors have access to that info (link requires a password).