ALEXANDRIA, Va., Sept. 17 -- United States Patent no. 12,415,020, issued on Sept. 16.

"Method and system for production of anti-microbial orthodontic elastomeric ligatures" was invented by Masood Feizbakhsh (Esfahan, Iran), Amir Sarrafzadeh (Tehran, Iran) and Zohreh Ghazalbash (Mashhad, Iran).

According to the abstract* released by the U.S. Patent & Trademark Office: "A method for production of anti-microbial orthodontic elastomeric ligatures is disclosed. The elastomeric ligatures are coated with an anti-microbial solution layer by layer. The coating solution comprising an anti-bacterial agent, a polymer and a solvent in the following ratio: 2 g anti-microbial agent, 4 g polymer and 200 mL solvent. The hypo-allergic latex-free orthodonti...