PAAm, a polymer of the acrylamide monomer, is a particularly popular colorless hydrogel material that is stable, nonresorbable, nontoxic, nonimmunogenic; with cohesive, viscoelastic, hydrophilic, and biocompatible properties. 135 Composed of 2.5% PAAm and 97.5% nonpyrogenic water, PAAm hydrogel was first introduced into esthetic surgery in the Ukraine in the 1980s. …
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