Evaluation of Cyclic Fatigue and Bending Resistance of Coronal Preflaring NiTi File Manufactured with Different Heat Treatments

Oh, Soram; Moon, Su‐Young; Chaniotis, Angelos; Pedullà, Eugenio; Al-Ghamdi, Adel Saeed; Al-Ghamdi, Fawzi Ali; Mandorah, Ayman; Perinpanayagam, Hiran; Kum, Kee‐Yeon; Peters, Ove A.; Chang, Seok Woo

doi:10.3390/app11167694

Cited by 4 publications

(3 citation statements)

References 35 publications

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“…К данным сплавам принадлежат файлы линейки XP-endo (FKG Dentire, Switzerland). Специфическая заданная форма и высокая гибкость позволяют этим инструментам сжиматься и расширяться внутри канала, обрабатывая участки, которых другие инструменты не могут достичь [9].…”

Section: Introductionunclassified

Optimization of difficult endodontic treatment with nickel-titanium files in martensitic and austenitic phase

Ostanina,

Mitronin,

Anisimova

et al. 2024

Èndodontiâ today

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INTRODUCTION. Nickel-titanium alloys and cutting-edge design of endodontic files continue to revolutionize. In addition to variations in the design of nickel-titanium files, manufacturers have implemented several proprietary manufacturing processing procedures to improve their mechanical properties.AIM. The aim of the study was to improve the quality of mechanical instrumentation of highly curved root canals based on the data of laboratory and experimental analysis of rotary endodontic instruments made of nickel-titanium alloys of various modifications.MATERIAL AND METHODS. As part of the research, the following endodontic rotary files systems were studied during instrumentation of curved root canals: group 1 – Mtwo (VDW); group 2 – Race Evo (FKG), group 3 – Ultrataper next (Eurofile). A metallographic analysis of the instruments was performed, a morphological structure of the root dentin after instrumental was examined by scanning electron microscopy, as well as the amount of extruded debris was studied.RESULTS. Groups 2 and 3 showed significant deterioration after three applications. Mtwo files showed a statistically higher amount of surface damage after five uses (p < 0.05). The smallest amount of extruded debris was found in the group 2, while the largest number of root dentin irregulations was found in the groups 1 and 3 (p < 0.001).CONCLUSIONS. A different degree of the surface damage of the instruments was revealed, depending on the number of treated root canals. The safest and most effective endodontic system for the mechanical preparation of curved root canals is the Race EVO.

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Section: Introductionunclassified

Optimization of difficult endodontic treatment with nickel-titanium files in martensitic and austenitic phase

Ostanina,

Mitronin,

Anisimova

et al. 2024

Èndodontiâ today

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“…Because of the reorientation capacity of the twinned phase structure, martensite has a superior cyclic fatigue resistance compared with austenite. And have a lower modulus of elasticity (30)(31)(32)(33)(34)(35)(36)(37)(38)(39)(40) than austenite (80-90 GPa). 5 So many manufacturers depend on the change of transformation temperatures (Ms, Mf, As, Af) of the utilized NiTi alloy, to alter the composition of phase to obtain a NiTi alloy with new properties.…”

Section: Introductionmentioning

confidence: 99%

“…24 In accordance with previous findings, several studies proved that Hyflex EDM exhibits a significantly increased cyclic fatigue resistance compared with Hyflex CM, M-Wire and conventional Ni-Ti instruments. 24,29,30,31,32,33,34 The Hyflex designed and marketed to shape and prepare root canals using a single-file technique in continuous rotation. 35 Hyflex EDM files have a tip size of 25, with a constant taper 0.08 in the apical 4mm of the instruments.…”

Section: Introductionmentioning

confidence: 99%

Hyflex CM and EDM from Shape Memory to Control Memory.

Abu Al Timan,

Al Zaka,

Zeidan

2023

EDJ

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The new era in endodontics has been established with the introduction of nickel titanium (NiTi) alloys, and later on the automation of mechanical preparation. By changing the phase transformation temperatures of NiTi alloy, the manufacturers alter the phase composition to have a NiTi with new mechanical properties. These mechanical properties can be achieved either by thermal, mechanical treatments or both. Moreover, many machining procedures (e.g. twisting, electrical discharge machining), were developed. The higher flexibility of thermomechanically treated NiTi alloys was found as the main advantages of these alloys with the improvement of cyclic fatigue resistance when compared to conventional NiTi. Austenitic alloys have superelastic properties due to stress-induced martensite transformation and consequently try to springback to their original shape after distortion. In contrast, the martensitic instruments have ability to reorientation of martensite variants when heated. So these instruments easily deformed and show a shape memory effect. Moreover, the use of martensitic alloy results in more flexible files, with an increased cyclic fatigue resistance compared with austenitic alloy. So, continued development in the manufacturing treatment of NiTi alloys has resulted in the producing of controlled memory (CM) wire. These materials do not possess superelastic properties at neither room nor body temperature. This article reviews the development process, features and properties of Hyflex file and Hyflex EDM file made from CM wire. Keywords: NiTi alloy, CM wire, Hyflex EDM, Heat treated NiTi

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Improving the fatigue strength of superelastic NiTi by using constrained groove pressing severe plastic deformation deform 3D modeling and microstructural analysis

Gebretsadik,

Ali

2023

Materials Science and Engineering: A

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Evaluation of Cyclic Fatigue and Bending Resistance of Coronal Preflaring NiTi File Manufactured with Different Heat Treatments

Cited by 4 publications

References 35 publications

Optimization of difficult endodontic treatment with nickel-titanium files in martensitic and austenitic phase

Optimization of difficult endodontic treatment with nickel-titanium files in martensitic and austenitic phase

Hyflex CM and EDM from Shape Memory to Control Memory.

Improving the fatigue strength of superelastic NiTi by using constrained groove pressing severe plastic deformation deform 3D modeling and microstructural analysis

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