Journal article

Defects in rotary nickel-titanium files after clinical use

B Sattapan, GJ Nervo, JEA Palamara, HH Messer

Journal of Endodontics | LIPPINCOTT WILLIAMS & WILKINS | Published : 2000


The purpose of this study was to analyze the type and frequency of defects in nickel-titanium rotary endodontic files after routine clinical use, and to draw conclusions regarding the reasons for failure. All of the files (total: 378, Quantec Series 2000) discarded after normal use from a specialist endodontic practice over 6 months were analyzed. Almost 50% of the files showed some visible defect; 21% were fractured and 28% showed other defects without fracture. Fractured files could be divided into two groups according to the characteristics of the defects observed. Torsional fracture occurred in 55.7% of all fractured files, whereas flexural fatigue occurred in 44.3%. The results indicate..

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University of Melbourne Researchers