Hyflex® cm rotary instrument advantage in s-shaped canals: a case report

Root canal systems often demonstrate high complexity with multiple curves in different planes. To deal with such complexities a new Nitinol rotary instrument (HyFlex® CM) has recently been marketed that is machined from a wire (termed CM-wire) thermomechanical processing procedure.HyFlex® CM NiTi files have been manufactured utilizing a unique process that controls the material’s memory, making the files extremely flexible but without the shape memory of other NiTi files. This gives the file the ability to follow the anatomy of the canal very closely, reducing the risk of ledging, transportation, or perforation compared to other instruments with rebound effect.The manufacturer reports that the shape and strength of files with straightened spirals can be restored during autoclaving. This means that the file appears to regain its shape after sterilization and reuse. Files not returning to original shape should be discarded. The aim of this paper is to demonstrate a case of S- shaped canal performed with HyFlex® CM rotary instruments.