![]() During enlargement of the apical third, this characteristic may be responsible for curvature defects such as apical transportation, ledging or zipping, which might compromise the outcome of treatment 2. Stainless steel endodontic instruments, whose characteristics include stiffness that increases with size, may set limitations to successful shaping. The goals of endodontic instrumentation are to shape without deviating from the original canal position, to enlarge until the walls are smooth and free of soft tissues, to completely remove microorganisms and debris, and to create a canal form that converges toward the foramen 1. Keywords: endodontics stainless steel nickel titanium. Reciprocating instruments are recommended for less experienced dentist. ![]() Reciprocating instruments have short lifespan, thus manufacturers recommend using one file per tooth. Modeling of the instrument with equivalent circular cross-sectional area did not affect results quality. 316L is not suitable for manufacturing reciprocating instruments. Very high levels of stress appeared in the file at 3 mm from the tip close to yield point. ![]() Results: Non-linear NiTi material showed super elasticity and high functionality in such applications. Non-linear static analysis was performed to simulate the instrument inside root canal at an angle of 45° in the apical portion, and subjected to torsion of 0.3 N.cm. The simplified instrument model geometry was created on commercial CAD/CAM software. Methods: A three-dimensional finite element model was designed for this study. ![]() 316L) as manufacturing material for such instruments. I National Research Centre, Department of Mechanical Engineering, Giza, Egypt II King Faisal Hospital, Dental Department, Makkah, KSA and Umm-Alqura University, Faculty of Dentistry, Department of Endodontics, Makkah, KSA III AL-Farabi Dental College, Department of Restorative Dentistry, Jeddah, KSA, and University of Al Azhar, Faculty of Oral and Dental Medicine, Department of Crown & Bridge, Assiut, Egypt IV University of Mansoura, Faculty of Dentistry, Department of Dental Biomaterials, Mansoura, Egypt V University of Mansoura, Faculty of Dentistry, Department of Conservative Dentistry, Mansoura, EgyptĪim: To evaluate the mechanical behavior of reciprocating endodontic files, comparing nickeltitanium (NiTi) and stainless steel 316L (St.St. *ProTaper® is a registered trademark of Dentsply Tulsa Dental Specialties Inc.A finite element study on the mechanical behavior of reciprocating endodontic files
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