Effect from Cyclic Fatigue of Nickel-Titanium Rotary Files on Torsional Resistance

Kim, Ju-Yeong; Cheung, Gary; Park, Se-Hee; Ko, Dae-Cheol; Kim, Jin-Wook; Kim, Hyeon‐Cheol

doi:10.1016/j.joen.2011.12.018

Cited by 50 publications

(56 citation statements)

References 25 publications

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“…The surfaces observed in this study were fractured from fatigue after repeated shrinking and stretching. This may be slightly different from previous reports (11)(12)(13)(14)(15)19) in that the break occurred instantaneously right across the entire fracture surface, creating a fracture from fatigue in the entire shaft. When using rotary gutta-percha removal Ni-Ti files in clinical practice, it is important to remember to use a file that is thinner than the diameter of the root canal to prevent the file from cutting into the root canal wall, and to consider the duration of file usage and number of times used.…”

Section: Methodscontrasting

confidence: 84%

“…In this test, there were no differences in data due to variations in crystal structure of the Ni-Ti files, suggesting that it differs from other tests and can be used to compare superelastic and shape memory Ni-Ti files. SEM shows characteristic dimpling with microvoids (11)(12)(13)(14)(15)19). Of particular interest was the observation of the dimpling that appeared when pressure was focused on the center of the shaft (19).…”

Section: Methodsmentioning

confidence: 99%

“…According to these reports, the rotary Ni-Ti file can remove gutta-percha from the root canal more quickly than hand implements. There have been many reports of various torsional resistance tests performed on Ni-Ti files in use (9)(10)(11)(12)(13)(14)(15). In addition, various designs of gutta-percha removal Ni-Ti files have been documented.…”

Section: Introductionmentioning

confidence: 99%

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Torsional Resistance Tests on Gutta-percha Removal Ni-Ti Files

Miura

Tsujimoto

2013

Int J Oral-Med Sci

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We performed torsional resistance tests to examine the Protaper Retreatment D1, D2 and D3 and the NRT-GPR 3N and 4N, which are Ni-Ti files used to remove gutta-percha in root canal retreatment. On cyclic fatigue failure tests, the D1 was the quickest to break, and the 4N took the longest to break. Torsional bending tests showed the fracture angle to be largest for the 4N, which was significantly different from that of all the other files (p < 0.01). There were no significant differences among the D1, D2 and D3. Torsional torque tests showed that the superelastic D1, that has the largest diameter, had the largest fracture torque. Files with larger diameters had higher fracture torques. On bending torque test, the D1 differed significantly from all the other files (p < 0.01). Significant differences were also seen between different versions of the same file type (p < 0.01). All of the fracture surfaces of files used in torsional resistance tests in the present experiment showed SEM findings that appear to be instantaneous breakage.The results of this experiment indicated that torsional resistance test values varied according to differences in file properties and shape. It may be necessary to consider these results when using files in clinical practice.

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Section: Methodscontrasting

confidence: 84%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Torsional Resistance Tests on Gutta-percha Removal Ni-Ti Files

Miura

Tsujimoto

2013

Int J Oral-Med Sci

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“…Despite the moderate curvature of the mesial root observed in the preoperative periapical radiograph in the present case, CBCT images at follow up suggested an abrupt curvature in the mesiobuccal canal. This situation adversely affects the cyclic fatigue resistance of the instrument, generating concentration of stress and predisposing the instrument to fracture (16)(17)(18). Three approaches can be used to solve intracanal instrument fracture: removing the instrument, bypassing the instrument, and preparing and filling the canal over the fractured fragment (3,9).…”

Section: Discussionmentioning

confidence: 99%

Obturation Over an S1 ProTaper Instrument Fragment in a Mandibular Molar with Three Years of Follow-up

et al. 2014

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This paper describes root canal filling performed over a large S1 ProTaper file fragment in a second mandibular molar with irreversible pulpitis. An S1 ProTaper file was fractured during the instrumentation of the mesiobuccal canal. Approximately 10 mm of file fragment remained in the apical and middle thirds of the canal. The obturation was performed over this fragment using thermomechanically compacted gutta-percha and sealer. Radiographic findings and the absence of clinical signs and symptoms at 3-year follow up indicated successful treatment. Cone-beam computed tomography images revealed absence of periapical lesion and details of intracanal file fragment related to root fillings and apex morphology. In this case, the presence of a large intracanal fractured instrument did not have a negative impact on the endodontic prognosis during the follow up evaluation period.

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“…Esta fractura se da de forma inesperada, esto es, sin signos previos de deformación plástica. Por otro lado, la fractura torsional ocurre cuando la punta del instrumento queda enganchada dentro del conducto radicular mientras el contraángulo, que sujeta el vástago, sigue girando (35,37,38,39). De este modo, el límite elástico del instrumento es sobrepasado, resultando una deformación plástica, y consecuentemente, se fractura (37,39).…”

Section: 32-tipos De Fracturaunclassified

Comparación in-vitro de la resistencia a la fatiga cíclica entre dos sistemas rotatorios de níquel-titanio para crear el Glidepath: Proglider y Pathfile

Flor¹

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Effect from Cyclic Fatigue of Nickel-Titanium Rotary Files on Torsional Resistance

Cited by 50 publications

References 25 publications

Torsional Resistance Tests on Gutta-percha Removal Ni-Ti Files

Torsional Resistance Tests on Gutta-percha Removal Ni-Ti Files

Obturation Over an S1 ProTaper Instrument Fragment in a Mandibular Molar with Three Years of Follow-up

Comparación in-vitro de la resistencia a la fatiga cíclica entre dos sistemas rotatorios de níquel-titanio para crear el Glidepath: Proglider y Pathfile

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