Over the past year I've had two root canals that resulted in
crowns with gold posts.  Both keep loosening and falling out.
In one case I swallowed one with obvious results.  My dentist
claims that he is using the largest post and my margins are very
thin.  On the other he's using the next to last largest post.  Isn't
there a better technique for holding crowns with posts in
permanently?  Stated another way -- is there an affordable
solution to the problem?  Can't something be added to the post
to make it harder to come out?  Perhaps a teaching school has
a later method of holding posts in place?

Regards...Bob