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Structures of Bis-GMA (acronyms see Introduction) and triethylene glycol dimethacrylate (TEGDMA) and of the acidic base monomers pyromellitic dimethacrylate (PMDM), biphenyl-dimethacrylate (BPDM), oxydiphthalic-dimethacrylate (ODPDM), and (isopropylidene-diphenoxy)bis(phthalic) dimethacrylate (IPDM). Other isomers with respect to the position of the acid groups, i.e., whether they are attached in meta or para position, are also possible.
