<<Disclaimer: Verify this information before applying it to your situation.>> This is an update on what I have turned up so far. Of course the usual disclaimers apply. Please check this information out for yourself to your own satisfaction. I have a letter from ESPE regarding the following products: Impregum, Ketac Cem, Etching Gel, Cavit. The letter reads as follows: Thank you for your inquiry regarding the use of gluten in ESPE products. While I am able to confirm that gluten is not used in any of ESPE's intra-oral materials, some of our external packing components are not manufactured by ESPE and, as such, I am unable to confirm the exclusion of gluten in either the composition or production of these materials. ESPE is aware of the and special requirements of the users of our products. I hope that I have provided you with sufficient information to aid in your selection of dental materials. Should you need any additional information, please do not hesitate to call. <End of Letter> Note: The materials named specifically above were the ones that my dentist uses that I specifically asked about. GC America is working on this. They have had a number of inquiries. They are being very cooperative, are working very thoroughly on their research, and are keeping me informed of their progress. I will report to you when I have anything definite from them. Still waiting for first response from other manufacturers that I have contacted. Hope this is helpful.