Thursday 30 June 2011

REWETTING AGENTS ( water and hema )


The benefit of the wet bonding technique is derived from the ability of water to retain the collagen framework and intertubular porosity patent for subsequent infiltration of monomers. Many dentist, however, still dry the cavity preparation after rinsing the etching gel which results in collagen collapse followed by closing of the micro-pores in the exposed intertubular collagen .

 For better bonding to happen re-wetting the dried etched dentin with WATER and HEMA ( hydroxy ethyl methacrylate ) was demonstrated to restore the bond strength values and raise the collapsed collagen network to a level compared to a wet bonding technique.

                            REF: Dental Materials 15 (1999) 282 -295

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