It depends! Each program is very different.
Really, I have a buddy at another OMFS program who did about 40 implants per month while at the VA and while I was at our VA I only did 2 in the most recent 3 weeks I was covering the clinic.
Why, b/c that was all that was set up for me by the previous resident. While I was there (3 weeks) I set up 12 for our 1st year resident coming the next month behind me. How many 1st years do you know get set up to do 12 implants in one day?
The great thing is the VA pays 100% for veterans who are eligible (many, many are) so they do not pay a dime. You could seriously do 100+/month if you really wanted to. Implants do not excite me a ton, so I am less ambitous about setting them up then say my friend who did 40 last month. There is absolutely no other residency program that has the ability to place more implants than OMFS b/c we work at the VAs. With that said, not all OMFS programs are in an area assoc with a VA, so you must check/ask when interviewing if they work at the VA. Also, you may find some perio programs have limited faculty at VAs in the same clinics, but the implants are typically reserved for the OMFS resident; at least this my understanding in speaking with friends at 4 diff programs across the nation.
So then, in my buddies 1st 2 years he has actually placed over 500 implants during his VA rotation of 9 months, but not all programs spend that long at the VA. For instance, I will only spend a max of 6 months or so there.
It basically comes down to money and there really is no way for a dental school perio program to have that many implants to let their residents place. I only mention perio b/c they are the other residency that primarily deals with implants. Sure, restorative, GPR, proths, and others may place a few, but the bulk is done by us and perio.
Hope this helps.