I believe a modern dentist can clean out the root and put in a permanent filling in on the same visit, if there are no complications due to infection... Probably $400.00-600.00 or higher depending on your market area.
Good luck.

__________________
-Marty

1986 300E 220,000 miles+ transmission impossible
(Now waiting under a bridge in order to become one)

Reading your M103 duty cycle:
http://www.peachparts.com/shopforum/831799-post13.html
http://www.peachparts.com/shopforum/831807-post14.html