An In Vitro Cyclic Fatigue Analysis of Different Endodontic Nickel-Titanium Rotary Instruments

Bhagabati, Nilav; Yadav, Seema; Talwar, Sangeeta

doi:10.1016/j.joen.2011.12.034

Cited by 57 publications

(49 citation statements)

References 31 publications

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“…The instruments fractured at about 5 mm from the tip of the instrument (Table 1), denoting a narrow area of maximum flexure for both instruments. These results were in accordance with previous studies 35,45) . Weibull analysis was performed as it relates the survival in clinical trials to data obtained from laboratory tests 24,46) .…”

Section: Discussionsupporting

confidence: 94%

Cyclic fatigue resistance of OneShape and WaveOne instruments using different angles of curvature

Elsaka

Elnaghy

2015

Dental Materials Journal

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This study compared the cyclic fatigue resistance of OneShape (OS) instrument which used continuous rotation with WaveOne (WO) instrument which used reciprocating motion. OS size 25, 0.06 taper and WO primary size 25, 0.08 taper were used in simulated canals with 45°, 60°, and 90° angles of curvature until fracture. The number of cycles to fracture (NCF) was recorded to evaluate cyclic fatigue resistance. Data were statistically analyzed using two-way analysis of variance and Tukey's HSD test. Weibull analysis was performed on NCF data. WO had a significantly higher NCF than OS for all angles of curvature (p<0.05). According to Weibull distribution, WO instrument was predicted to have a higher number of cycles to survive than OS instrument. WO instrument which used the reciprocating motion had a greater resistance to cyclic fatigue than OS which used continuous rotation movement.

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Section: Discussionsupporting

confidence: 94%

Cyclic fatigue resistance of OneShape and WaveOne instruments using different angles of curvature

Elsaka

Elnaghy

2015

Dental Materials Journal

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“…It has been reported to have a higher fatigue fracture resistance than ground files (66,(69)(70)(71)(72). Pedulla et al (73) evaluated the resistance to cyclic fatigue of the TF, Mtwo (VDW, Munich, Germany), and Revo S Shaping Universal (SU; Micro Mega, Besancon, France) files after immersion in sodium hypochlorite.…”

Section: R-phasementioning

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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“…5 Many variables might contribute to file separation, but the 2 main causes are cyclic fatigue and torsional fatigue. Each has been adequately defined in endodontic literature 6,7 and clinically, cyclic fatigue seems to be more prevalent in curved root canals, whereas torsional failure might happen even in a straight canal. 8 Although both these failure modes probably occur simultaneously in a clinical situation, 6 studies have found cyclic fatigue to be the primary cause of file separation.…”

Section: Introductionmentioning

confidence: 99%

Effect of cyclic torsional preloading on cyclic fatigue resistance of ProTaper Next and Mtwo nickel–titanium instruments

Pedullà

Savio

Plotino

et al. 2015

Giornale Italiano di Endodonzia

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Aim: To evaluate the influence of different torsional preloads on cyclic fatigue resistance of endodontic rotary instruments made by conventional nickel-titanium (NiTi) or M-Wire. Methods: Eighty new Mtwo (#25/0.06) (Sweden & Martina, Due Carrare, Padova, Italy) and ProTaper Next X2 (Dentsply Maillefer, Ballaigues, Switzerland) were used. The Torque and distortion angles at failure of new instruments (n = 10) were measured and 0% (n = 10), 25%, 50%, and 75% (n = 20) of the mean ultimate torsional strength as preloading condition were applied according to ISO 3630-1 for each brand. The twenty files tested for every extent of preload were subjected to 25 or 50 torsional cycles (n = 10). After torsional preloading, the number of cycles to failure was evaluated in a simulated canal with 608 angle of curvature and 5 mm of radius of curvature. Data were analyzed using 2-way analysis of variance. Scanning electron microscope (SEM) was performed to evaluate the fracture surface of each fragment.Peer review under responsibility of Società Italiana di Endodonzia.

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An In Vitro Cyclic Fatigue Analysis of Different Endodontic Nickel-Titanium Rotary Instruments

Cited by 57 publications

References 31 publications

Cyclic fatigue resistance of OneShape and WaveOne instruments using different angles of curvature

Cyclic fatigue resistance of OneShape and WaveOne instruments using different angles of curvature

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

Effect of cyclic torsional preloading on cyclic fatigue resistance of ProTaper Next and Mtwo nickel–titanium instruments

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