الفهرس 
REVIEW OF LITERATUREOnly 14 pages are availabe for public view
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Abstract
The aim of this study was to compare between the static flexural cyclic fatigue of TwoShape and OneShape rotary file system. A total of thirty-six rotary files of these two systems were subjected to cyclic fatigue testing. A special device which allowed a reproducible position of the instrument inside the custom-made artificial canal was used. All files were classified into two groups; group (A) composed of eighteen OneShape files and group (B) composed of eighteen TwoShape {TS2} files. These files were allowed to rotate inside a stainless-steel artificial canal until fracture. This canal had 60° angle of curvature and 5 mm radius. 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 showed that TwoShape files had significantly higher cyclic fatigue resistance when compared with OneShape files. However, there was no significant difference in the length of separated fragment between the two groups.