A syringe useful for washing root canals wherein the syringe is configured and arranged with a two-position valve which, in a first position, supplies the syringe with hydrogen perioxide and, in the second position, supplies the syringe with sodium peroxide. In a selected embodiment, the valve has a...http://www.google.es/patents/US5171146?utm_source=gb-gplus-sharePatente US5171146 - Syringe for washing teeth root canals
