A dispenser for marker disks to limit the depth of penetration of root-canal preparatory instruments is composed of a plastic base foil of such a strength that it may be punctured by a root-canal preparatory instrument. Deep-drawn recesses are formed in the base foil such that the marker disks...http://www.google.com/patents/US5752598?utm_source=gb-gplus-sharePatent US5752598 - Dispenser for storage of marker disks used in root canal therapy
