a dentin adhesive system consisting of an etchant (10% citric acid, 3% ferric chloride); a primer, HEMA (2-hydroxyethyl methacrylate);and a bonding agent containing 4-META (4-(2-(methacryloxyethoxy)carbonyl)phthalic acid anhydride), MMA (methylmethacrylate), TBB (tri-n-butyl borane), and PMMA (polymethylmethacrylate)
Date introduced: January 1, 1994