![]() It should be noted that this was after 11 sterilization cycles, which seems more than most clinicians will accept. The authors suggested that the deposits could be an increase in the layer of TiO2. In another study, sterilization alone, without simulated use, has been credited in creating small defects and new deposits on the file surface (6). Others have show changes on the edges of the flutes and minor cracks after 5 or 6 simulated uses on Profiles rotary files (4,5). have shown that a 60 seconds active period in an acrylic block only induces minor changes on the file surface, but that a 240 seconds use created major surface alterations (3). Scanning electron microscopy (SEM) was used to inspect endodontic rotary files after use or after sterilization. Next month, in our second article, we will analyzed the literature on the sterilization of endodontic files from a microbiological standpoint, especially looking at prion contamination. Last, we will look at the torsional strength changes after sterilization. In this section, we will see if there is a difference between the different generation of Ni-Ti materials when sterilized. Second, the effects of usage and sterilization on the cyclic fatigue resistance will be addressed. First, we will see what happens to the file edges and how it affects the cutting efficiency. In this first article, we will review how using and sterilizing the files can modify the three majors mechanical properties of the rotary files. ![]() In a series of two articles, we will discuss the previously mentioned aspects of reusing rotary endodontic files. In the same manner, is there a loss of cutting efficiency that could reduce the cleaning ability of the file? Second, is there a cross contamination risk in using the same endodontic files on different patients? Since the endodontic instruments have small flutes that can get packed with pulpal tissue or infected dentin, are we sure that our sterilization methods can get rid of all the possible infectious agents? It is important to know what happens to the cyclic fatigue resistance and the torsional strength of the instruments after usage and sterilization. This accident was seen in 2.4%% of files used in an endodontic clinic (2). First, do their mechanicals properties change after shaping a canal or after a sterilization cycle? This is important to know as endodontic files can separate inside the canals of the tooth and cause a blockage that will prevent root canal disinfection. Due to the nature and the usage of endodontic files, using them multiples times raises some concerns. To reduce the fees associated with rotary files, most practitioners sterilize them and reuse them on different patients, just like other metal dental instruments. These new instruments revolutionized root canal therapy but also greatly increased the cost of material for dentists. The first Ni-Ti rotary files came to the market a few years later in the early 1990s. Nickel-titanium (Ni-Ti) alloy was first used for endodontic files by Walia in 1988 (1) as an alternative to stainless steel for hand files.
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