| http://www.w3.org/ns/prov#value | - The best properties in these materials have been obtained when the resin part of the composition is comprised of one or more of the following monomers: ##STR2## i.e., 2,2-bis[4'(3-methacroyl-2-hydroxypropoxy)phenyl]propane (known in the industry as Bis-GMA), its adducts with various alkyl-isocyanates, such as adducts described in the Waller U.S. Pat. No. 3,629,187, the entire disclosure of which
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