Michael Magdy Selim, Hossam Mohamed Tewfik And Amr Ahmed Bayoumi,

ABSTRACT


Aim: To Compare Two Rotary NiTi Systems Namely: Protaper Next And Protaper Gold And The Evaluation Will Include Cyclic Fatigue Resistance, Cutting Efficiency And Surface Changes.

Materials and Methods: A Total Of 64 Fileswere Used In This Study To Evaluate The Cutting Efficiencyand Cyclic Fatigue Resistance. Selected Samples From The Cutting Efficiencytest Were Examined Under The Stereomicroscope And Selected Samples From The Cyclic Fatigue Resistance Test Were Examined Under The Scanning Electron Microscope. Samples Were Classifiedinto Two Main Groups According To Rotary System Used, And Further Subdivided Into Two Sub Divisions According To The Evaluation Method.

Results: The Cyclic Fatigue Resistance Of Protaper Gold Was Significantlyhigher Than The Protaper Next In All Groups Of This Study (P? 0.05). Furthermore, The Cutting Efficiencyshowed No Statistically Difference Between Mean Percentages Of Weight Loss Among The Two Groups (P? 0.05) Conclusion: The Protaper Gold Rotary NiTi System Could Be Regarded As The System Of Choice Concerning Its Lower Incidence Of Fracture. Both Tested Systems Were Satisfactory In Their Cutting Behavior.