I have been out of school for a while, but back in the late 80's what I did was to inquire on my first day of dental school what it took to be a successful applicant to the OMS program. The OMS dept. head told me to attend Grand Rounds he conducted every Wednesday and Saturday at 7:00 AM. I did this faithfully for 4 years and I was a shoo-in for one of the two available 1st yr. resident spots. I never did any externship, never did a paper or even a table clinic. Just showed up for Grand Rounds, and spent every bit of down time (e.g. patient no-shows) in the OMS clinic slicking teeth. I did my lab work and my didactic studies in the evening and weekends. I graduated 22nd in a class of 145, and my Boards were 87/90. Nothing spectacular, but I went through one of the best OMS residencies in the country at the time. I think if you show a strong interest in OMS, you will get in. To be successful in private practice, you have to have surgery as your vocation and your hobby and neglect your family and friends as much as possible. That's the road to wealth in OMS. If you want to walk with the bravado of a surgeon, that's what it takes. Forget about externships. If your dental school has an OMS program, start kissing butt!