A dentist I shadowed under owned a large practice and had an endo who worked for her. I did about 10 hours shadowing underneath the endo. Who would my supervisor be? the dentist who owned the practice or the endo?
I was thinking the same thing yesterday but for maxillofacial surgery and general, I put my main supervisor's name for both. Basically in your case, I would put the dentist who owned the practice b/c he's your supervisor who happens to have associates whom you've shadowed.
Two opposing views...lol. I was leaning more toward the owner of the practice considering they were the one really "supervising" me the whole time. But I can be wrong.