Ahmed Khalid Mohamed Elhag <br/><br/>
Effect of instrumentation on the cyclic fatigue of two Nickel-Titanium rotary instruments /  
 تأثير الاستعمال على مقاومة الاجهاد الدورى لإثنين من أدوات النيكل تيتانيوم الدوارة 
Ahmed Khalid Mohamed Elhag ; Supervised Nihal Ezzat Sabit , Abeer Ahmed Elsabaa 
 - Cairo :   Ahmed Khalid Mohamed Elhag ,   2013 
 - 87 P. :   charts ;   30cm 
<br/><br/>Thesis (M.Sc.) - Cairo University - Faculty of Oral and Dental Medicine Department of Endodontics 
<br/><br/> The present study was conducted to compare the resistance to cyclic fatigue of two Nickel-Titanium rotary instry instruments; Twisted files (SybronEndo) and RaCe (FKG Dentaire) before and after being used in 4 and 12 canals. Methodology: Sixty Nickel-Titanium endodontic files were tested for cyclic fatigue. These instruments consisted of two main groups; Twisted, and RaCe files, in which both represented equilateral triangular cross section 
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<br/><br/><label>Subjects--Index Terms: </label>Cyclic fatigue  Files fracture  Rotary files