Abstract
Dental adhesive systems used for bonding dental resins to enamel and dentin have evolved through several "generations," with changes in chemistry, mechanism, number of bottles, application technique, and clinical effectiveness. The trend in the latest generation of dental bonding systems is to reduce the number of components and clinical placement steps. The introduction of i bond, a single-bottle dental adhesive system, is the latest of the new generation materials, and combines etchant, adhesive, and desensitizer in one component. This paper describes different dentin bonding agents, its evolution, mechanism of action and different commercially available dentin bonding agents and their role in the retention of pit and fissure sealant.
Highlights
Dentin/enamel adhesives allow bonding of resin-based composites and compomers to primary and permanent teeth
Sixth generation bonding agents: The sixth-generation dental adhesive systems introduced in the late 1990s and early 2000s eliminated the separate acid-etching step by incorporating an acidic primer that was placed on the enamel and dentin after tooth preparation and isolation from saliva
At 6 months evaluation the sealant placed with use of bonding agent showed higher retention rate than its counterpart placed without a bonding agents
Summary
Dentin/enamel adhesives allow bonding of resin-based composites and compomers to primary and permanent teeth. Usha Mohan Das, Suma G disappointed to find that the resin-dentin bond strengths to acid-etched dentin was very low (5-10 MPa). He predicted that this bonding technique could be used in various dental procedures, including class III and class V restorations and pit and fissure sealants. Most were halophosphorous esters of unfilled resin such as Bis GMA (Bisphenol a glycidyl methacrylate) or HEMA They bonded to dentin via surface wetting and interaction between their phosphate groups and calcium ion in the smear layer. Shear dentin bond strengths were only about 1-10 Mpa. A major problem in clinical performance of these agents is that they bonded to the smear layer rather than to the dentin itself.
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