STATIC FLEXURAL CYCLIC FATIGUE OF TWO ROTARY FILE SYSTEMS (AN IN VITRO STUDY)
Abd Elsalam, R., Moussa, S., Sherif, R. (2020). STATIC FLEXURAL CYCLIC FATIGUE OF TWO ROTARY FILE SYSTEMS (AN IN VITRO STUDY). EKB Journal Management System, 45(3), 67-73. doi: 10.21608/adjalexu.2020.122740
Raghdaa A. Abd Elsalam; Sybel M. Moussa; Raef A. Sherif. "STATIC FLEXURAL CYCLIC FATIGUE OF TWO ROTARY FILE SYSTEMS (AN IN VITRO STUDY)". EKB Journal Management System, 45, 3, 2020, 67-73. doi: 10.21608/adjalexu.2020.122740
Abd Elsalam, R., Moussa, S., Sherif, R. (2020). 'STATIC FLEXURAL CYCLIC FATIGUE OF TWO ROTARY FILE SYSTEMS (AN IN VITRO STUDY)', EKB Journal Management System, 45(3), pp. 67-73. doi: 10.21608/adjalexu.2020.122740
Abd Elsalam, R., Moussa, S., Sherif, R. STATIC FLEXURAL CYCLIC FATIGUE OF TWO ROTARY FILE SYSTEMS (AN IN VITRO STUDY). EKB Journal Management System, 2020; 45(3): 67-73. doi: 10.21608/adjalexu.2020.122740

STATIC FLEXURAL CYCLIC FATIGUE OF TWO ROTARY FILE SYSTEMS (AN IN VITRO STUDY)

Alexandria Dental Journal
Article 12, Volume 45, Issue 3, December 2020, Page 67-73  XML PDF (1.26 MB)
Document Type: Original Article
DOI: 10.21608/adjalexu.2020.122740
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Authors
Raghdaa A. Abd Elsalam email 1; Sybel M. Moussa2; Raef A. Sherif2
1Bachelor of Dentistry, Faculty of Dentistry, Pharos University, Alexandria, Egypt
2Professor of Endodontics Department, Faculty of Dentistry, University of Alexandria, Alexandria, Egypt
Abstract
INTRODUCTION: Cyclic fatigue fracture is caused by repeated compressive/tensile stresses that accumulate around the curved rotating file. Many efforts have been made to increase the fracture resistance of Nickel-titanium (NiTi) rotary instruments, such as the use of heat-treated alloy, modification of the instrument's cross section and the improvement of surface treatment.
OBJECTIVES: The aim of this study was to compare the static flexural cyclic fatigue of TwoShape (Micro Mega, Besancon, France) rotary file system which is made of T-Wire heat treatment technology and OneShape (Micro Mega, Besancon, France) rotary file system which is made of conventional nickel-titanium alloy.
MATERIALS AND METHODS: Eighteen files from each system were subjected to static cyclic fatigue test. Cyclic fatigue testing was performed in a device which allowed a reproducible position of the instrument inside a custom-made stainless-steel artificial canal. The artificial canal had a curvature of 60° angle and 5 mm radius. All instruments were allowed to rotate inside the artificial canal until fracture. Time to fracture (TTF) was recorded using a digital chronometer. The number of cycles to failure (NCF) was calculated. The length of separated fragments was recorded. Data were analysed.
RESULTS: The NCF of TwoShape files (365.909±82.077) was statistically significantly higher when compared with the OneShape files (266.681±35.218) p < .05. While there was no significant difference in the length of separated segments between both systems.
CONCLUSIONS:Within the limitations of this study, the cyclic fatigue resistance of heat treated TwoShape files was significantly higher than the OneShape files. [T-wire] heat treatment drastically enhanced the cyclic fatigue resistance of the file.  
Keywords
cyclic fatigue; OneShape; TwoShape; artificial canal; number of cycles to fracture; NiTi rotary files
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