Table 1 Questions used in the questionnaire and for the interview with an occupational physician.

Have you used copper amalgam? yes- no

Have you ever worked with copper amalgam?

If yes:

In what time period did you do this:

What year did you start using copper amalgam?

In what year did all your use of copper amalgam end*

Have you worked with amalgam that was manually mixed in a mortar? yes-no

Have you ever manually weighted mercury and alloy and mixed it in a mortar?

If yes:

In that case, when and for how many years?

From year...to year...

Have you mixed amalgam in a Dentomat? Yes-no

Did you use a Dentomat (semi-automatic device) to prepare amalgam?

If yes:

In that case, when and for how many years?

In what time period did you do this:

From year... to year....*.

Was the Dentomat adjusted to produce soft or firm amalgam? Soft.... Firm...*.

How often was the Dentomat filled?*

   More often than once a week.*

   Once a week.*

   Once every second week.*

   More seldom than once every second week.*