I went to Louisville, and they DIDN'T allow us to do that, or endo retreats, or place implants, which always ticked me off...my currant fellow co-resident graduated from Creighton, and he was taught how to take out impacted 3rd molars, and how to do endo retreats, and he placed implants in dental school...reasons being there's no grad programs at Creighton, while at Louisville everything got sent to them that was remotely challenging.
Downside- in my opinion, if you want to specialize, there's some real advantages to going to a school with specialty programs...maybe there's a d-school out there that lets you have both...