Endodontic Rotary Files
7 products
About rotary files
Rotary files are nickel-titanium instruments introduced in the mid-1990s; their lower modulus of elasticity means they press less hard on the dentine walls of a curved canal. An advantage named for them is a well-tapered shape with less operator fatigue, though a taper lock in a narrow canal can lead to a ledge, a perforation or a separated file. Heat-treated nickel-titanium resists bending fatigue better than earlier designs, but the more martensitic instruments do not resist torsion as well.
Machine-driven and flexible, in place of stiff steel that tends to straighten inside the canal. The drawback named for them is a high fracture risk.
Sources: Glide Path in Endodontics: A Literature Review of Current Knowledge, 2024 (Dent J) · The Biomechanics of Nickel Titanium Instrument Fracture in Root Canal Therapy: A Narrative Review, 2024 (Materials)