Dental dressing assemblies are formed from hydrophilic polymer sponge structures, such as a densified chitosan biomaterial....http://www.google.ca/patents/US7897832?utm_source=gb-gplus-sharePatent US7897832 - Compositions, assemblies, and methods applied during or after a dental procedure to ameliorate fluid loss and/or promote healing, using a hydrophilic polymer sponge structure such as chitosan
