الخلاصة

AbstractABSTRACT : The reciprocating file program was claimed the resistance be increased to fatigue in evaluation with the rotation file program.Newly 2 new kinds of NiTi files have been marketed one curve file and VDW blue. The purpose of this study was to comparison of cyclic fatigue resistance amongProTaper gold, one curve, WaveOne® Gold and VDW blue files. Cyclic fatigue testedfour files with the zirconia artificial canal curve 45 canal a simultaneouspecking motion hasobtain with (n = 6 each) instrument that (operataccording to recommended reciprocationmotion until the ProTaper gold, one curve, WaveOne® Gold and VDW blue filesfractured . ProTaper F2 and one curve were tested incontinuous rotation and WaveOne® Gold and VDW blue files tested in reciprocation movement. (NCF) represent number ofcycles to fracture which obtain by measuring the time spend to fracture. Using one-way statisticanalysis. The results revealed that VDW blue had higherNCF&then One-curve and then WaveOne gold and the ProTaper gold F2 had a lowest NCF. Reciprocating files VDW blue demonstratedsignificantly higher cyclic fatigue than others files (P <0.01). The 2 brands of NiTi file VDW blue and One-curve appear to have superior mechanical properties than WaveOne gold and ProTaper gold F2.