Figure 2: Mechanical damage to self-adjusting file (SAF) files. (a) An intact SAF file. (b) Separated SAF file. The file separated during a root canal treatment in the mesial root of the second right mandibular molar and remained in the canal. It was removed using a canal debrider #30. (c) Arch detachment in an SAF file. (d) Several arch detachments in an SAF file. No metal fragments remained in the canal (the small size of the arches compared to the canal into which the whole file could be inserted)