Most dental resins are ester-based (meth)acrylate resin, which can be susceptible to hydrolytic degradation, especially when used in the presence of water and highly acidic conditions, such as self-etching adhesives.  This in turn can impact the long-term performance or bounding durability.  Therefore there is strong demand for hydrolytic stable polymerizable resins or additives such as hydrolytic stable polymerizable antibacterial resins or hydrolytic stable and water-soluble cross-linkers. 
The polymerizable acrylamide resins are known for its hydrolytic stability and N-substituted acrylamide resins were also known for its improved water solubility.  CA 2250333, U.S. Pat.  Nos.  6,172,131 and 6,350,839 disclose hydrolysis-stable and polymerizable acrylphosphonic acids for use as dental adhesive monomers.  DE 273846 discloses polymerizable phosphonic amides.  U.S. 2010/0076157 discloses a method for producing a polymerizable amide containing both carboxylic and phosphoric groups.