| The root canal treatment is a worldly acknowledged iatrotechnics in endodontic therapy. The researches for new devices and technologies for root canal preparation were always challenging. Much knowledge and experience have been obtained in the last decades.Due to the restriction of the complex root canal geometry, all endodontic instruments have the tendency to straighten within the root canal, resulting in the misfortunes including ledges of zip formation, perforation of the canal, and separation or fracture of the endodontic instruments. So it is not easy to maintain the original anatomy configuration and the position in space of the apical foramen in clinical root canal treatment. With the advancement of the material science and the machining technology, nickel-titanium (Ni-Ti) alloy was introduced to the manufacture of endodontic instruments. As the super-elasticity and shape memory of the Ni-Ti alloy, Ni-Ti endodontic instruments are much more flexible than stainless steel instruments to facilitate the instrumentation of curved canals and minimize clinical misfortunes.In traditional mechanical tests of endodontic instruments, most studies were emphasized on in vitro experiments using simulated canals. Few studies on the factors affecting the mechanical behaviors of endodontic instruments were reported theoretically. This research aimed to analyze the mechanical behaviors of Ni-Ti endodontic instruments using finite element method (FEM), and to construct a program package in the environment of ANSYS software package. So it is possible to give some help or suggestions to the optimizing design and clinical usage of Ni-Ti endodontic instruments.Firstly, based on the studies of previous literatures, the feasibility and practicability, reconstructing and analyzing the mathematical models of NiTi endodontic instruments using finite element method especially the ANSYS software package, were certified. Afterwards, the geometrical parameters of seven...
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