Based on a tip from an Internet article, I asked my dentist today after my cleaning if he had any old tools around that were to be disposed of. He left the room and came back with a good thirty or so dental probes, pokers, scrapers and other jabbey things that he was happy to hand off. Said he had never been asked for retired dental implements before but was happy to donate them to my model making efforts (just don't pretend to be a home dentist with them, he said).
These are very high quality, heavy duty instruments that are absolutely better than anything from the tool store. As long as you don't mind their bloody legacy, I highly recommend a trip to the dentist.
Timbo