Influence of Electrochemical Polishing on the Mechanical Properties of K3 Nickel-Titanium Rotary Instruments

Barbosa, Fabiola Ormiga Galvão; Gomes, José Antônio da Cunha Ponciano; Araújo, Marcos César Pimenta de

doi:10.1016/j.joen.2008.08.023

Cited by 25 publications

(18 citation statements)

References 28 publications

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“…Overall, these findings are in line with several previous studies (7,10,12,14,21). However, they are in disagreement with others (15)(16)(17)(18).…”

Section: Discussionsupporting

confidence: 74%

“…The benefits of electropolishing are likely to be caused by reduction in surface irregularities that serve as points for stress concentration and crack initiation. On the other hand, one study (18) reported that electrochemical polishing did not increase the mechanical resistance of NiTi K 3 endodontic files. The electrochemical treatment affected neither resistance to flexural fatigue nor torsional resistance of K 3 instruments.…”

Section: Discussionmentioning

confidence: 94%

“…Some previous studies showed that the surface finishing process increases the fatigue resistance of rotary NiTi instruments (7,10,(12)(13)(14). However, other studies reported that surface finishing defects do not influence the fatigue life of rotary NiTi instruments (15)(16)(17)(18). The purpose of the present study was to analyze the influence of electropolishing surface treatment on the number of cycles to fracture of BioRace (FKG Dentaire, La Chaux-de-Fonds, Switzerland) rotary NiTi endodontic instruments.…”

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confidence: 91%

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Effects of Electropolishing Surface Treatment on the Cyclic Fatigue Resistance of BioRace Nickel-Titanium Rotary Instruments

Lopes

Elias

Vieira

et al. 2010

Journal of Endodontics

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“…Overall, these findings are in line with several previous studies (7,10,12,14,21). However, they are in disagreement with others (15)(16)(17)(18).…”

Section: Discussionsupporting

confidence: 74%

Section: Discussionmentioning

confidence: 94%

mentioning

confidence: 91%

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Effects of Electropolishing Surface Treatment on the Cyclic Fatigue Resistance of BioRace Nickel-Titanium Rotary Instruments

Lopes

Elias

Vieira

et al. 2010

Journal of Endodontics

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“…This test method has been adopted for many studies on the mechanical properties of NiTi instruments (88,89).…”

Section: Torsional Propertiesmentioning

confidence: 99%

Current Challenges and Concepts of the Thermomechanical Treatment of Nickel-Titanium Instruments

Shen

Zhou

Zheng

et al. 2013

Journal of Endodontics

458

438

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Introduction: The performance and mechanical properties of nickel-titanium (NiTi) instruments are influenced by factors such as cross-section, flute design, raw material, and manufacturing processes. Many improvements have been proposed by manufacturers during the past decade to provide clinicians with safer and more efficient instruments. Methods: The mechanical performance of NiTi alloys is sensitive to their microstructure and associated thermomechanical treatment history. Heat treatment or thermal processing is one of the most fundamental approaches toward adjusting the transition temperature in NiTi alloy, which affects the fatigue resistance of NiTi endodontic files. The newly developed NiTi instruments made from controlled memory wire, M-Wire (Dentsply Tulsa Dental Specialties, Tulsa, OK), or R-phase wire represent the next generation of NiTi alloys with improved flexibility and fatigue resistance. The advantages of NiTi files for canal cleaning and shaping are decreased canal transportation and ledging, a reduced risk of file fracture, and faster and more efficient instrumentation. The clinician must understand the nature of different NiTi raw materials and their impact on instrument performance because many new instruments are introduced on a regular basis. Results: This review summarizes the metallurgical properties of next-generation NiTi instruments, the impact of thermomechanical treatment on instrument flexibility, and the resistance to cyclic fatigue and torsion. Conclusions: The aim of this review was to provide clinicians with the knowledge necessary for evidence-based practices, maximizing the benefits from the selection and application of NiTi rotary instruments for root canal treatment. (J Endod 2013;39:163-172)

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“…Some authors 46,47 found an extension of fatigue life for electropolished instruments while most did not. [48][49][50] Moreover, Boessler et al 51 suggested a change in cutting behavior with an increase of torsional load after electropolishing; however, cyclic fatigue was reduced. One possible reason for these variations is the different testing environments used in these experiments.…”

Section: Surface Treatment Of Niti Alloysmentioning

confidence: 99%

Evolution of Nickel–titanium Alloys in Endodontics

Anil¹,

Neelakantan²,

Nassif³

2017

The Journal of Contemporary Dental Practice

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To improve clinical use of nickel-titanium (NiTi) endodontic rotary instruments by better understanding the alloys that compose them. A large number of engine-driven NiTi shaping instruments already exists on the market and newer generations are being introduced regularly. While emphasis is being put on design and technique, manufacturers are more discreet about alloy characteristics that dictate instrument behavior. Along with design and technique, alloy characteristics of endodontic instruments is one of the main variables affecting clinical performance. Modification in NiTi alloys is numerous and may yield improvements, but also drawbacks. Martensitic instruments seem to display better cyclic fatigue properties at the expense of surface hardness, prompting the need for surface treatments. On the contrary, such surface treatments may improve cutting efficiency but are detrimental to the gain in cyclic fatigue resistance. Although the design of the instrument is vital, it should in no way cloud the importance of the properties of the alloy and how they influence the clinical behavior of NiTi instruments.

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Influence of Electrochemical Polishing on the Mechanical Properties of K3 Nickel-Titanium Rotary Instruments

Cited by 25 publications

References 28 publications

Effects of Electropolishing Surface Treatment on the Cyclic Fatigue Resistance of BioRace Nickel-Titanium Rotary Instruments

Effects of Electropolishing Surface Treatment on the Cyclic Fatigue Resistance of BioRace Nickel-Titanium Rotary Instruments

Current Challenges and Concepts of the Thermomechanical Treatment of Nickel-Titanium Instruments

Evolution of Nickel–titanium Alloys in Endodontics

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