Cyclic (Flexural) and Torsional Separation/Fracture. These are the 2 most cited reasons why files fracture. The literature does not agree if either type is more important. What is important, is a basic understanding what affects an endodontic file during use and some methods to prevent fracture.
Here is an overview of the keypoints that I discussed during our seminar:
http://www.slideshare.net/AMARKDMD/endo-file-separation-discussion
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