Eugenio Pedullà1, Fabio Lo Savio2, Simona Boninelli3, Gianluca Plotino4, Nicola M Grande4, Guido La Rosa5, Ernesto Rapisarda1. 1. Department of General Surgery and Surgical-Medical Specialties, University of Catania, Catania, Italy. 2. Department of Industrial Engineering, University of Catania, Catania, Italy. Electronic address: flosavio@dii.unict.it. 3. MATIS, Institute of Microelectronics and Microsystems, National Research Council, Catania, Italy. 4. Department of Endodontics, Sapienza University of Rome, Rome, Italy. 5. Department of Industrial Engineering, University of Catania, Catania, Italy.
Abstract
INTRODUCTION: The purpose of this study was to evaluate the torsional and cyclic fatigue resistance of the new Hyflex EDM OneFile (Coltene/Whaledent AG, Altstatten, Switzerland) manufactured by electrical discharge machining and compare the findings with the ones of Reciproc R25 (VDW, Munich, Germany) and WaveOne Primary (Dentsply Maillefer, Ballaigues, Switzerland). METHODS: One hundred-twenty new Hyflex EDM OneFile (#25/0.08), Reciproc R25, and WaveOne Primary files were used. Torque and angle of rotation at failure of new instruments (n = 20) were measured according to ISO 3630-1 for each brand. Cyclic fatigue resistance was tested measuring the number of cycles to failure in an artificial stainless steel canal with a 60° angle and a 3-mm radius of curvature. Data were analyzed using the analysis of variance test and the Student-Newman-Keuls test for multiple comparisons. The fracture surface of each fragment was examined with a scanning electron microscope. RESULTS: The cyclic fatigue of Hyflex EDM was significantly higher than the one of Reciproc R25 and WaveOne Primary (P < .05 and P < .001, respectively). Hyflex EDM showed a lower maximum torque load (P < .05) but a significantly higher angular rotation (P < .0001) to fracture than Reciproc R25 and WaveOne Primary. No significant difference was found comparing the maximum torque load, angular rotation, and cyclic fatigue of Reciproc R25 and WaveOne Primary (P > .05). CONCLUSIONS: The new Hyflex EDM instruments (controlled memory wire) have higher cyclic fatigue resistance and angle of rotation to fracture but lower torque to failure than Reciproc R25 and WaveOne Primary files (M-wire for both files).
INTRODUCTION: The purpose of this study was to evaluate the torsional and cyclic fatigue resistance of the new Hyflex EDM OneFile (Coltene/Whaledent AG, Altstatten, Switzerland) manufactured by electrical discharge machining and compare the findings with the ones of Reciproc R25 (VDW, Munich, Germany) and WaveOne Primary (Dentsply Maillefer, Ballaigues, Switzerland). METHODS: One hundred-twenty new Hyflex EDM OneFile (#25/0.08), Reciproc R25, and WaveOne Primary files were used. Torque and angle of rotation at failure of new instruments (n = 20) were measured according to ISO 3630-1 for each brand. Cyclic fatigue resistance was tested measuring the number of cycles to failure in an artificial stainless steel canal with a 60° angle and a 3-mm radius of curvature. Data were analyzed using the analysis of variance test and the Student-Newman-Keuls test for multiple comparisons. The fracture surface of each fragment was examined with a scanning electron microscope. RESULTS: The cyclic fatigue of Hyflex EDM was significantly higher than the one of Reciproc R25 and WaveOne Primary (P < .05 and P < .001, respectively). Hyflex EDM showed a lower maximum torque load (P < .05) but a significantly higher angular rotation (P < .0001) to fracture than Reciproc R25 and WaveOne Primary. No significant difference was found comparing the maximum torque load, angular rotation, and cyclic fatigue of Reciproc R25 and WaveOne Primary (P > .05). CONCLUSIONS: The new Hyflex EDM instruments (controlled memory wire) have higher cyclic fatigue resistance and angle of rotation to fracture but lower torque to failure than Reciproc R25 and WaveOne Primary files (M-wire for both files).
Authors: Murilo Priori Alcalde; Marco Antonio Hungaro Duarte; Clovis Monteiro Bramante; Bruno Carvalho de Vasconselos; Mario Tanomaru-Filho; Juliane Maria Guerreiro-Tanomaru; Jader Camilo Pinto; Marcus Vinicius Reis Só; Rodrigo Ricci Vivan Journal: Clin Oral Investig Date: 2017-12-09 Impact factor: 3.573
Authors: Suzanny C S Martins; Jessica D Silva; Paula R Garcia; Ana C D Viana; Vicente T L Buono; Leandro A Santos Journal: Clin Oral Investig Date: 2022-01-17 Impact factor: 3.573