Microstructural and mechanical characterizations of new Ni-Ti endodontic instruments
1 University Paris Diderot, Sorbonne Paris Cité, 75013 Paris, France
2 PSL Research University, Chimie ParisTech - CNRS, Institut de Recherche de Chimie Paris, 75005, Paris, France
3 AP-HP, Hospital Rothschild, 75012 Paris, France
4 Sorbonne Universities, UPMC University Paris 06, UFR926, 75005 Paris, France
a Corresponding author: firstname.lastname@example.org
NiTi alloys have been used for many years in dentistry, especially in endodontology. High flexibility of NiTi alloys, compared to the stainless steel one, has made of NiTi the alloy of choice for the new generation of shaping files. Despite the improvement of file design, endodontic NiTi instruments are not perfect and the risk of fracture during use is still a concern. In recent years, several new thermomechanical processes have been developed to optimize the structure of NiTi alloys, in particular, the development of treatments named “M-wire”, “R phase” and “CM wire” technologies. According to the manufacturers, these innovative treatments may improve the flexibility and the fatigue life of endodontic instruments. In the present work, new generations of these files have been characterized using DSC and bending tests and compared to a conventional NiTi file. The new endodontic instruments seem to improve the instrument properties. Hypotheses on the microstructural modifications due to specific thermomechanical treatments are proposed.
© Owned by the authors, published by EDP Sciences, 2015
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