Why do we pre-bend files and how can we pre-bend an austenitic (traditional) NiTi File? Are Martensitic Files (CM Wire or M-Wire Files) better because they can be pre bent? What are their limitations? In this tutorial Dr. Nasseh discusses a trick for pre-bending traditional files, which allows the user to take advantage of the advantages of a sharper cutting edge from an Austenitic file while also having the benefit of prebending you can get from Martensitic files.