Dental bonding agents with phosphate monomers recently were applied in dentistry and produced the desired clinical effect due to the increase in adhesion between resin system and teeth or metal.The phosphate monomers from three commercial bonding agents were separated by a reversed-phase HPLC using a linear gradient elution method with 0.1% trifluoroacetic acid/CH_3CN(100:0⇒0:100).Monomers(MDP)were identified by NMR spectroscopy.
