Volume 8 Issue 9 (September, 2020)

Original Articles

Cyclic Fatigue and Torsional Resistance of Reciproc versus Waveone Used in Reciprocation Motion- A Comparative Study
Dr. Alen Pius, Dr.Syed Shujaulla, Dr.Syeda Tawkhira Tabasum, Dr. Mohammed Mustafa, Dr Abdurahiman V T, Dr. Ummey Salma

Aim: The aim of this study was to evaluate cyclic fatigue and torsional resistance of instruments between two reciprocating systems (Reciproc and Wave-One) Methodology: Cyclic fatigue test with a simultaneous pecking motion was performed with the instrument. (n = 15 each) operating in the recommended reciprocation motion until fracture for the Reciproc R25 and Wave-One Primary files. ProTaper F2 was tested in continuous rotation to serve as a control for comparison. The number of cycles to fracture (NCF) was determined by measuring the time to fracture. The length of the fragment was measured and the fracture surface was examined by using scanning electron microscopy. Torsional strength was measured by using a torsiometer after fixing the apical 5 mm of the instrument rigidly. Statistical analysis was performed by using one-way analysis of variance. Results: The results showed that Reciproc had a higher NCF and Wave-One had a higher torsional resistance than the others. Both reciprocating files demonstrated significantly higher cyclic fatigue and torsional resistances than Pro-Taper (P < .05). Conclusion:Operating files in reciprocating motion enhances their cyclic fatigue resistance. Wave-One files showed maximum resistance to cyclic fatigue and torsional failure due to their cross‑sectional diameter coupled M‑Wire technology. Keywords: Cyclic fatigue; reciprocation; torsional failure; Wave-One, Reciproc.

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