I have been referred to a dentist who decides what to use based on your compatibility with the product. He says:
Individual Biocompatibility is established after successfully testing each product or material against a specific individual. A number of testing techniques are available to health practitioners for individual biocompatibility testing. Individual biocompatibility testing is important because a product or material that is generally biocompatible may still be a problem for a specific individual. A simple example is food allergies where foods considered very safe can still cause severe allergic reactions in a few individuals. For that reason absolute biocompatibility does not exist. Obviously if a product or material has poor general biocompatibility then it is very likely that it will also have poor individual biocompatibility and vice versa. Some individuals have a high level of tolerance and may tolerate materials with poor or average biocompatibility but using them would offer only a relatively narrow margin of safety as any changes in the individual's health over time could reduce or eliminate his tolerance level. Furthermore the need to tolerate a material with poor or average biocompatibility will still exact a price that the well informed individual may not want to pay.

This guy is in NZ so not much help to you Jason but sure there must be someone in your area the same. My guy's web site is www.integrativedentalmedicine.com and has a lot of useful info even though he's a bit far away for you.