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Failure mechanism of ProTaper Ni-Ti rotary instruments during clinical use: fractographic analysis.
Int Endod J
March 2006
Department of Endodontics, University of Athen's School of Dentistry, Athens, Greece.
Aim: To evaluate the failure mechanism of ProTaper Ni-Ti rotary instruments fractured under clinical conditions.
Methodology: A total of 46 ProTaper instruments that failed (fractured and/or plastically deformed) during the clinical use were collected from various dental clinics, whereas a new set of ProTaper instruments served as control. After inspection under stereomicroscopy the instruments were classified into three categories: (i) plastically deformed but not fractured, (ii) fractured with plastic deformation and (iii) fractured without plastic deformation.