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Hello Everyone!  Thus far, most people who responded were looking for
the same type of information that I am.  I did get a post from a dental
hygenist who is looking into the ingredients.  I will summarize her
responses back to the list.  She is not able to do it before my husbands
appointment.   I did just speak to the dentist.  He indicated that to
make the temporary crown, the ingredients are synthetic based (aluminum,
plastics) and that it should not cause a problem for celiacs.

I will keep everyone update in the next week or so, and let you know if
my husband had a reaction.

Kristen White, CT