K files are the universal standard for canal negotiation, shaping, and recapitulation of root canal systems. They are generally used with a quarter turn “watch-winding” motion and vertical pull. Despite their function, K files possess limitations, primarily their lack of stiffness in negotiation of curved and calcified canals, and tip design.
H files, with either a cutting tip (Mani H files) or safe-ended hand files (Mani SEC-O H) are both used to grasp canal obstructions (often gutta percha but possibly separated files and/or carriers) and deliver them coronally through application of an upward force. Clinically, to deliver this upward force, the clinician must first bypass the obstruction with a K file .
Packet of 6.