To evaluate the properties of two nickel-titanium (NiTi) reciprocating endodontic instruments (commercially known as Procodile and Reziflow), a total of 40 size 25 and 0.06 taper new Procodile and Reziflow instruments (n = 20) were subjected to cyclic fatigue tests (60° angle of curvature, 5-mm radius) at 20 °C and 37 °C and a torsional test based on ISO 3630-1. The fracture surface of each fragment was examined. The morphological, mechanical, chemical, thermal, and phase composition characteristics of the files were investigated by field-emission gun scanning electron microscopy (FEG-SEM) equipped with an energy-dispersive X-ray (EDX) detector, focused ion beam analysis (FIB), micro-Raman spectroscopy, X-ray diffraction (XRD), differential scanning calorimetry (DSC), and Auger electron spectroscopy (AES). Reziflow showed higher cyclic fatigue resistance than Procodile at 37 °C (p < 0.05). The maximum torsional strength of Procodile was lower than that of Reziflow (p < 0.05). No difference was found between their angular rotations to fracture (p > 0.05). SEM, FIB, Micro-Raman, and AES analyses revealed the presence of an Nb/Nb2O5 coating on the Procodile surface. DSC and XRD analysis confirmed that both files consist of an almost austenitic phase structure at 37 °C. The cyclic fatigue resistance of Procodile and Reziflow significantly decreases upon exposure to body temperature.

Mechanical Properties and Metallurgical Features of New Green NiTi Reciprocating Instruments / Generali, Luigi; Malovo, Anastasiya; Bolelli, Giovanni; Borghi, Alessia; La Rosa, Giusy Rita Maria; Puddu, Pietro; Lusvarghi, Luca; Rota, Alberto; Consolo, Ugo; Pedullà, Eugenio. - In: MATERIALS. - ISSN 1996-1944. - 13:17(2020), pp. 1-17. [10.3390/ma13173736]

Mechanical Properties and Metallurgical Features of New Green NiTi Reciprocating Instruments

Generali, Luigi;Bolelli, Giovanni;Borghi, Alessia;Puddu, Pietro;Lusvarghi, Luca;Rota, Alberto;Consolo, Ugo;
2020

Abstract

To evaluate the properties of two nickel-titanium (NiTi) reciprocating endodontic instruments (commercially known as Procodile and Reziflow), a total of 40 size 25 and 0.06 taper new Procodile and Reziflow instruments (n = 20) were subjected to cyclic fatigue tests (60° angle of curvature, 5-mm radius) at 20 °C and 37 °C and a torsional test based on ISO 3630-1. The fracture surface of each fragment was examined. The morphological, mechanical, chemical, thermal, and phase composition characteristics of the files were investigated by field-emission gun scanning electron microscopy (FEG-SEM) equipped with an energy-dispersive X-ray (EDX) detector, focused ion beam analysis (FIB), micro-Raman spectroscopy, X-ray diffraction (XRD), differential scanning calorimetry (DSC), and Auger electron spectroscopy (AES). Reziflow showed higher cyclic fatigue resistance than Procodile at 37 °C (p < 0.05). The maximum torsional strength of Procodile was lower than that of Reziflow (p < 0.05). No difference was found between their angular rotations to fracture (p > 0.05). SEM, FIB, Micro-Raman, and AES analyses revealed the presence of an Nb/Nb2O5 coating on the Procodile surface. DSC and XRD analysis confirmed that both files consist of an almost austenitic phase structure at 37 °C. The cyclic fatigue resistance of Procodile and Reziflow significantly decreases upon exposure to body temperature.
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Mechanical Properties and Metallurgical Features of New Green NiTi Reciprocating Instruments / Generali, Luigi; Malovo, Anastasiya; Bolelli, Giovanni; Borghi, Alessia; La Rosa, Giusy Rita Maria; Puddu, Pietro; Lusvarghi, Luca; Rota, Alberto; Consolo, Ugo; Pedullà, Eugenio. - In: MATERIALS. - ISSN 1996-1944. - 13:17(2020), pp. 1-17. [10.3390/ma13173736]
Generali, Luigi; Malovo, Anastasiya; Bolelli, Giovanni; Borghi, Alessia; La Rosa, Giusy Rita Maria; Puddu, Pietro; Lusvarghi, Luca; Rota, Alberto; Consolo, Ugo; Pedullà, Eugenio
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11380/1209139
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