I am shocked you had such an ordeal with dental implants. The technique is almost the same now as it was more than 25 years ago, and no one I know has had anything but local anesthesia for their placement then or now.
Seriously? I had the Brånemark inplants in 1991-1992. At that time it had to be done by an oral surgeon, he had a nurse anesthetist handle the IV...I thought it would just be a standard oral surgery (they had done the previous procedures on me, but were in dental-looking rooms with a couple straps on the chair. I remember waking up during one procedure and deciding they were not done, and I should go back to sleep.), but we went to a different part of the building where they had a small tiled OR, everyone in scrubs except me, and I had to put on a cap and shoe covers (still don't know why I had shoe covers with street clothes; made no sense to me then or now...the only guess is that when I am horizontal my feet get close to the "clean zone").
As far as I know, it was standard procedure to do these under sedation at the time. It was suggested I use the restroom first; I asked and the "tech" (not a nurse, don't know what she was) said they had had a recent problem. We went in, got me capped and bootied in the chair. This was a totally different experience than I had previously. Much more medical, a bit scary to tell the truth.
When I woke up, I felt fine. I took one pain pill and never needed the rest. The only issue I had were my eyes itching. I mentioned it the next time when we did the following part and the nurse told me it was the lacrilube and confirmed that they had intubated me (by this point I was working on premed and was employed in medicine).
Apparently the placement on me was really tricky, as it was replacing a tooth that never had a proper root and was after orthodontics; it was very tight. The implant failed because it was too close to the roots and not enough bone; it broke loose and twisted when the dentist tried to tighten against it with a torque wrench. A new adventure in pain I would not wish on anyone.
Anyway, they had to replace it with a smaller one that was not FDA approved at the time, except in cases like this. The rep had to fly one in from Denmark and I met him at the fourth (#1 implant, #2 set up for dentist, #3 remove and pack with bone, #4 implant again) surgery, which they apparently paid for.
So, there was some difference, at least in my area.