Unfortunately, the researchers have not tested sealants that contain bishydroxymethacryloxypropoxylphenylpropane (BisGMA). BisGMA is bonded on either side of a BPA molecule via an ether group. This ether group is very stable and not susceptible to decomposition by conditions found in the oral cavity. BisGMA is found in many dental sealants and most composites. BisGMA does not break down into BPA.
The ADA has responded to these reports by saying:
The ADA believes any concern about potential BPA exposure from dental composites or sealants is unwarranted at this time. When compared with all other sources of BPA, these dental materials pose significantly lower exposure concerns. The presence of a substance, whether in the environment, human blood or urine samples, does not mean it’s necessarily harmful to human health. That would typically depend on how much of the substance we are exposed to. Almost any substance can have a harmful effect at high doses- even water and vitamins.
Dentsply who makes Delton pit and fissure sealant now are still making the original formula of Delton and it is still made with BPDMA. They also have four new formulations with BisGMA. BisGMA is well known and well established, and has been widely used my many dental manufacturers since the sixties and seventies.