Re: question on getting a crown..
Here's my experience as I assisted the dentist during a crown appt.
Since you've had a root canal the tooth won't have to be have anesthetic. But, the gumline around the tooth will need a little bit.
The dentist will take an impression of the tooth so that he can make a temporary for you to wear while you wait for the permanent crown.
Then he/she will begin to "shave" the tooth. The tooth will be taken down to look like a peg shape, thicker at the gumline and then becoming more narrow, so that it fits in the permanent crown.
Then you're ready for the impression. The dentist may fit a thin cord under the gumline around the tooth before the impression is taken. (He'll remove the cord before taking the impression) The reason for this is so that the impression material will go under the gumline a bit, since he wants the permanent crown to be made to fit under the gumline just a bit. This will hide the top of the crown under the gumline and it will help so that food doesn't get caught and cause any gum problems.
After the impression comes out the way it should, the temporary will be placed, the bite will be checked and you will be dismissed. You will return in a couple of weeks for the insertion of your permanent crown.
If I forgot anything, I'll add it later.
Let me know if there are any other questions....and have fun!