Hey there,
These days when my parents fly up here to Buffalo from NYC to visit me, they usually fly Jet Blue, which seems to have the cheapest tickets from JFK to BNIA most of the time. Alternatively, you can take US Air from LaGuardia to BNIA. AA Eagle (American's commuter airline) and Continental also fly from JFK to BNIA. Jet Blue is definitely the cheapest out of the three though.
It takes about 20 minutes by cab to go from BNIA to UB South Campus where the dental school is located.
I hope my school makes a good impression on you. Good luck on your interview!