title: Chemical aspects of self-etching enamel-dentin adhesives: a systematic review.
abstract: OBJECTIVE
  The paper gives an overview on the components and the polymer chemical aspects of currently used self-etching enamel-dentin primers/adhesives. In addition, the contribution of new adhesives monomers and cross-linkers exhibiting enhanced hydrolytic stability than methacrylates to improve the performance of single-bottle adhesives is discussed.
  
  
  METHODS
  Information from original scientific papers or reviews about enamel-dentin adhesives, the patent literature concerning dental adhesives and manufacturer information of commercial self-etching adhesives were included in this review.
  
  
  METHODS
  The most efficient self-etching enamel-dentin adhesives are based on strongly acidic adhesive monomers, containing dihydrogenphosphate, phosphonic acids or carboxylic acid groups. Serious problems of single-bottle water-based, strongly acidic self-etching enamel-dentin adhesives arise both from the hydrolytic instability of the methacrylate monomers used and the side reaction of the applied initiator components.
  
  
  CONCLUSIONS
  The stability of the self-etching enamel-dentin adhesives can be improved by using new acrylic ether phosphonic acids or mono- or difunctional acrylamides, while more stable and compatible components have to be developed in the future.
authors.affiliation: Research and Development, Ivoclar Vivadent AG, FL-9494 Schaan, Liechtenstein.
authors.forename: Norbert
authors.initials: N
authors.lastname: Moszner
authors.forename: Ulrich
authors.initials: U
authors.lastname: Salz
authors.forename: Jörg
authors.initials: J
authors.lastname: Zimmermann
mesh_terms: D000178:Acrylamides / Q000737:chemistry; D000269:Adhesives / Q000737:chemistry*; D002264:Carboxylic Acids / Q000737:chemistry; D001840:Dental Bonding / Q000379:methods*; D003743:Dental Enamel; D003804:Dentin; D017220:Dentin-Bonding Agents / Q000737:chemistry*; D006801:Humans; D008689:Methacrylates / Q000737:chemistry; D063065:Organophosphonates / Q000737:chemistry
chemical_list: D000178:Acrylamides; D000269:Adhesives; D002264:Carboxylic Acids; D017220:Dentin-Bonding Agents; D008689:Methacrylates; D063065:Organophosphonates