EVALUATION OF CYCLIC FATIGUE RESISTANCE OF ROTARY NITI VS CONTROLLED MEMORY ENDODONTIC FILE SYSTEMS: AN IN-VITRO STUDY
Abstract
The purpose of this study was to compare fracture resistance of Hyflex CM, Hero Shapers and Vortex NiTi file systems due to cyclic fatigue in curved canals. The methodology in this study involved testing the cyclic fatigue of endodontic root canal file rotating at 375 rpm. A simulated model was created such that, the instrument will bend at 60 degrees during function, maximum curvature being 5 mm from the tip of the file. The number of rotations till the instrument fractured was recorded by mathematical formula. The results were statistically analyzed. Hyflex CM performed significantly better than Vortex & Hero Shapers file system. However there was no statistically significant difference observed between Vortex & Hero Shapers file system in terms of cyclic fatigue.
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References
2. Guelzow A, Stamn O. Comparative study of six rotary nickeltitanium systems and hand instrumentation for root canal preparation. IEJ 2005;38:743-752.
3. Ankrum MT, Hartwell GR. Protaper and Profile systems: breakage and distortion in severly curved roots of molars. JEndod 2004; 30:234-237.
4. Sattapan B, Nervo GJ, Palamara JE. Defects in rotary nickeltitanium files after clinical use. J Endod 2000; 26:161-165.
5. Margot E Anderson, John WH, Peter Parashos. Fracture resistance of electropolished rotary nickel titanium endodontic instruments. J Endod 2007;33:1212-1216.
6. Youssef Haikel, Rene Serfaty, Geoff Bateman. Dynamicand cyclic fatigue of engine driven rotary nickel titanium endodontic instruments. J Endod 1999;
25:434-440.
7. Schneider SW. A comparison of canal preparation in straightand curved root canals. Oral Surg 1971; 32:271-275.
8. Buehler WJ, Cross WB.55 Nitinol unique wire alloy memory. Wire J 1969; 2:41-49.
9. Michael A Baumann. Nickel- titanium: Options and challenges. DCNA 2004; 48:55-67.
10. Ruddle CJ. The Protaper technique. Endod Prac 2002; 5:22-30.
