Comparison of Torsional Stiffness of Nickel-Titanium Rotary Files with Different Geometric Characteristics

Baek, Seung Ho; Park, Sungha; Versluis, Antheunis; Kim, Byung Min; Lee, Woo-Cheol; Kim, Hyeon‐Cheol

doi:10.1016/j.joen.2011.05.032

Cited by 97 publications

(88 citation statements)

References 28 publications

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“…The 2 reciprocating file systems are made of the same alloy (M-wire) but have different cross sections, S-shape and concave triangular shape for Reciproc and WaveOne, respectively. It was reported that the larger cross-sectional area would have a higher flexural and torsional stiffness (16,17), and thus the file design (cross-sectional shape, diameters of core, etc) would have a significant influence on the torsional and bending (hence, fatigue) resistance (17). From our experimental results, Reciproc showed higher cyclic fatigue but lower torsional resistance than WaveOne.…”

Section: Discussionmentioning

confidence: 60%

“…In addition, ProTaper had a greater number of spiraling flutes (ie, smaller pitch) than the 2 reciprocation brands. This would have an effect of increasing the stiffness along the shaft and, consequently, making stress concentration at those areas fixed by resin embedding, resulting in a lower value of measured torsional strength (15,16). Although the present study measured the ultimate torsional strength by single-direction rotation at a constant but slow speed, it is obvious that an instrument with a higher torsional strength would have better durability against the repetitive torsional stresses.…”

Section: Discussionmentioning

confidence: 81%

“…It implies that Reciproc possesses lower flexural stiffness and smaller polar moment of inertia than WaveOne. In other words, WaveOne had a higher torsional stiffness than Reciproc (14)(15)(16)(17)(18).…”

Section: Discussionmentioning

confidence: 96%

See 2 more Smart Citations

Cyclic Fatigue and Torsional Resistance of Two New Nickel-Titanium Instruments Used in Reciprocation Motion: Reciproc Versus WaveOne

Kim¹,

Kwak²,

Cheung³

et al. 2012

Journal of Endodontics

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331

377

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Section: Discussionmentioning

confidence: 60%

Section: Discussionmentioning

confidence: 81%

See 1 more Smart Citation

Cyclic Fatigue and Torsional Resistance of Two New Nickel-Titanium Instruments Used in Reciprocation Motion: Reciproc Versus WaveOne

Kim¹,

Kwak²,

Cheung³

et al. 2012

Journal of Endodontics

Self Cite

331

377

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show abstract

“…[21] It was reported that the larger cross-sectional area (CSA) would have a higher flexural and torsional stiffness,[26] and thus the file design (cross-sectional shape, diameters of core, etc) would have a significant influence on the torsional and bending (hence, fatigue) resistance. [21] Instruments made from M-wire or R-phase NiTi were reported to offer greater flexibility and resistance to cyclic fatigue than the files from traditional alloys.…”

Section: Discussionmentioning

confidence: 99%

“…This would have the effect of increasing the stiffness along the shaft and, consequently, resulting in a lower value of torsional strength. [26]…”

Section: Discussionmentioning

confidence: 99%

Cyclic fatigue resistance of OneShape, Reciproc, and WaveOne: An in vitro comparative study

et al. 2014

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Aims:The aim of this in vitro study was to evaluate the cyclic fatigue resistance of three single-use nickel–titanium (NiTi) instruments.Materials and Methods:Forty files each of OneShape (OS), Reciproc R25 (R25), WaveOne Primary (WO) file, and ProTaper (PT) F2 (as control) were tested in four curved artificial canals with different angles and radii of curvature. The number of cycles to fracture (NCF) was determined and the data were compared for differences by using two-way analysis of variance (P < 0.05).Results:In general, all single-use instruments were more resistant than traditional rotary instrument used as control. R25 showed the highest cyclic fatigue resistance. One Shape and WO files showed similar cyclic fatigue resistance values, higher than PT F2.Conclusions:Within the limitations of this study, it can be concluded that R25 was the most fatigue resistant. OS rotary instruments seem to have good mechanical resistance, similar to NiTi files developed for reciprocating motion.

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Cyclic and torsional fatigue resistance of a new rotary file on a rotary and reciprocating motion

Só,

Siocheta,

Calefi

et al. 2023

Microscopy Res & Technique

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This study evaluated the cyclic and torsional fatigue resistance of a new nickel‐titanium (Flat File 25.04) instrument on the continuous and reciprocating motion. Sixty instruments of the ProDesign Logic2 25.03 and 25.05 (Easy Equipamentos Odontológicos, Belo Horizonte, Brazil), and MK Flat File 25.04 (n = 20) (MK Life, Porto Alegre, Brazil) were used. For the cyclic fatigue test, an artificial stainless steel simulated canal with an angle of 60° and a radius of curvature of 5 mm located 5 mm from its tip was used. The torque and rotation angle at the instruments' failure on the torsional fatigue test was based on the ISO 3630‐1 protocol, in which the 3 mm tip of each instrument was fixed and connected to an electric motor and a load cell. The fractured surface of each fragment was examined by scanning electron microscopy. Data were analyzed using a 1‐way analysis of variance and Tukey's test with a significance level of 5%. Flat File 25.04 had lower cyclic fatigue in both kinematics than the Logic instruments (p < .05). Reciprocating motion improved the cyclic fatigue of the tested instruments (p < .05). Flat File 25.04 had similar torque to Logic2 25.05 (p > .05), and both were superior to Logic2 25.03 (p < .05). The angular deflection values were different for the three tested instruments (p < .05), in the decreasing order: Logic2 25.03, 25.05, and Flat File 25.04. Flat File presented good resistance to cyclic and torsional fatigue resistance. Reciprocating motion improved the cyclic fatigue resistance of the instruments and can be considered when using programmable motors.Research Highlights Scanning electron microscopy evaluation of different endodontic rotary file and fatigue resistance tests.

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Comparison of Torsional Stiffness of Nickel-Titanium Rotary Files with Different Geometric Characteristics

Cited by 97 publications

References 28 publications

Cyclic Fatigue and Torsional Resistance of Two New Nickel-Titanium Instruments Used in Reciprocation Motion: Reciproc Versus WaveOne

Cyclic Fatigue and Torsional Resistance of Two New Nickel-Titanium Instruments Used in Reciprocation Motion: Reciproc Versus WaveOne

Cyclic fatigue resistance of OneShape, Reciproc, and WaveOne: An in vitro comparative study

Cyclic and torsional fatigue resistance of a new rotary file on a rotary and reciprocating motion

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