Know nothing about OHSU, but know quite a bit about Univ of MN Dental School. Great dental school, but old facilities. Great environment to learn (aside from the cold winters). The 6 years that I was there for undergrad, never once they shut the school down for a snow day even in the -50 windchill weather and an inch of ice on all the highways.
The dental school has a very strong research foundation and the board scores are respectable. Matching rate into specialties are impressive and licensure board (CRDTS) passing rate is also top notch. FYI, the state of Minnesota just passed this past year in its legislature that dental graduates now are able to choose to do a year of Post-doctorate residency (GPR or AEGD) instead of taking the CRDTS. Minnesota is one of two state in the US that is allowing this, the other state is New York.
You'll get to interact with other health professions students since you all will be in the same building (Moos Towers). Aside from education, you'll also be in a wonderful beautiful city of Minneapolis. A lot of things to do for social and family events. It's a great family city as well as a party city.
If you don't mind the winter and you want a great dental education in a fun city, then MN will be a great choice. I decided not to apply to MN dental because I do not want to stay there another 4 years after already 6!
Good luck in choosing a school. Go where you can see yourself being happy for 4 years.