The tested device is an engine-operated endodontic file used for root canal treatment. It is constructed from a medical grade nickel-titanium alloy and designed as a hollow tube made of a delicate metal lattice, attached to a dental hand-piece. It is operated in root canals with a continuous rinsing. The rinsing solution enters the hollow device through a special irrigator attachment, flows through the root canal and emerges through the access cavity, where it is collected using a dental suction tip.