I am not a dentist or a dental assistant so I don't know the answer to this question.
I just through crowning 6 teeth though.

Temps are not meant to last a long time. I had mine on 3 weeks and they stull functioned and looked very good with no breaking or falling off.
However, several years back I had 4 crowned and the dentist had me in those temps for 6 months!!! Bad idea. No, horrible idea. I never had one break but they did fall off way to often and I was super careful.
The thing is besides looks and function is the gum tissue around the crown. It is so important to keep that very, very clean. It is hard to do with temps that are on too long and because your gums with change (recede, I guess) around a temporary crown. They are just not meant for long term.
If I were you, I'd sit down with the dentist and ask him to help you with some suggestions for payment. Most likely he/she will try to help in some way. if you have temps put on and wait to long, damage will be done and you might be looking at gum surgery/treatment and alos crowns that may not do as well as they should have/would have.
I was so thrilled that I did not have to wait 6 months this go around. 3 weeks was a breeze! Good luck. Dental work is no fun and costly too but it is important to just "get it done".
