Temperature-Dependent Cyclic Fatigue Resistance and Differential Scanning Calorimetry Analysis of Three Rotary Nickel Titanium Instruments

Abstract

The aim of the study was to compare the CF resistance of Hyflex EDM, M3 Pro gold and Soco Pro files at room temperature and body temperature and to document the corresponding phase transformations. Total of 60 files #25 of these brands were selected for the study, CF testing was done using a dynamic CF testing device along with a custom made artificial stainless steel canals which had 90° and 5mm radius of curvature. There was three groups, each (n=20). Each group was subdivided into 2 subgroups according to the environment temperature: Subgroup a (room temperature) and Subgroup b (body temperature), samples were rotated continuously until fracture in the artificial canals, the NCF was calculated. Phase transformation temperatures for 2 instruments of each brand were analyzed by DSC.