| 摘要 |
<p>A new composition for treating periodontal disease by means of a therapeutic agent delivery device placed within the periodontal pocket so that release of the therapeutic agents occurs in the immediate vicinity of the disease process, without that a release adjusting agent or adhesive agent is present so that biocompatibility or allergic problems cannot arise. A slow release of a therapeutic agent is obtained as well as a mechanical protection on the wounds and a barrier to bacteria. The a composition comprises a therapeutic agent in a biocompatible polymeric material. The therapeutic agent is soluble both in water and in alcohol and the biocompatible polymeric material is a liquid methacrylate copolymer chosen among EUDRAGIT RL or EUDRAGIT RS or a mixture thereof. The polymers are provided as a liquid in an alcoholic solution, (preferably about 96%), or hydroalcoholic solution (preferably 20:80 w/w). When the polymer is spread on a surface, the alcohol evaporates and the polymer forms a polymeric film on that surface. When water present in the mouth tissues permeates through the material, the therapeutic agent is released. By proper selection of the two polymeric material EUDRAGIT RS and RL, a precise release rate is obtained. In fact, by varying the ratio RS/RL the hydrophilic property varies accordingly. In particular, if RL is increased, the release rate of the therapeutic agent is increased.</p> |
