Torsional properties of twisted and machined endodontic files

Seto, Bradley G.; Nicholls, Jack I.; Harrington, Gerald W.

doi:10.1016/s0099-2399(06)81905-9

Cited by 40 publications

(35 citation statements)

References 9 publications

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“…The two parameters evaluated were angular deflection at failure and maximum torque, and the methods used have been widely used (6,7). The results showed that the Mtwo retreatment file #15 exhibited greater angular deflection at failure when compared with the other instruments tested.…”

Section: Discussionmentioning

confidence: 99%

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Torsional Resistance of Retreatment Instruments

Lopes

Elias

Vedovello

et al. 2011

Journal of Endodontics

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Section: Discussionmentioning

confidence: 99%

“…The torsional assay was performed as described elsewhere (6,7). Torsion without axial load was applied with a device attached to the crosshead of the universal testing machine.…”

Section: Methodsmentioning

confidence: 99%

Torsional Resistance of Retreatment Instruments

Lopes

Elias

Vedovello

et al. 2011

Journal of Endodontics

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“…Of particular interest was the observation of the dimpling that appeared when pressure was focused on the center of the shaft (19). The only study to date that also uses a retreatment file is that of Lopes et al (13) (9)(10)(11)(12). However, the fracture surfaces observed in the present study were fracture surfaces of files after undergoing torsional resistance tests, and were not the area of tip immobilization after torsional fracture tests.…”

Section: Methodsmentioning

confidence: 60%

“…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%

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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“…De acordo com Matheus et al (5) ao realizarem ensaios mecânicos em instrumentos endodônticos estabeleceu-se uma relação média de aumento do ângulo de torção máximo com o aumento do diâmetro nominal dos instrumentos de duas marcas comerciais. Todavia, para Campos e Pertot, (6) ,Canalda-Sahli, BrauAguadé e Berastegui-Jimeno (7) e Seto, Nicholls e Harrington, (8) o ângulo de torção máximo na fratura, para instrumentos manuais de NiTi, diminui com o aumento do diâmetro nominal do instrumento endodôntico, enquanto que, Carmo et al (9) afirmam que o ângulo de rotação não é influenciado pelo aumento do diâmetro do instrumento.…”

Section: Introductionunclassified

DISPOSITIVO PARA FLEXÃO ROTATIVA DE FIOS NiTi EM ENSAIO DE FADIGA

Matheus¹,

Magalhaes²,

Menezes³

et al. 2008

TMM

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Na Endodontia, a maior preocupação no uso de instrumentos de NiTi acionados a motor se deve ao fato da ocorrência inesperada de fraturas do instrumento, sem sinal algum ou prévio aviso, especialmente se usada inapropriadamente. (3,4) Desta forma, percebe-se que o carregamento em fadiga é um ponto importante no estudo das propriedades mecânicas, tanto dos instrumentos usinados quanto do material empregado na sua confecção. A flexão rotativa tem surgido como um teste padrão com o objetivo de avaliar a fadiga estrutural de fios com memória de forma, INTRODUÇÃOAs ligas NiTi (níquel-titânio), conhecidas desde a década de 70, possuem um dos melhores desempenhos quanto à recuperação de forma, de até 7%, quando comparadas as demais ligas com efeito de memória de forma (EMF). Suas aplicações estendem-se da área aeroespacial à médica e odontológica, sendo que nesta última destacam-se os fios ortodônticos para a correção da arcada dentária e as limas endodônticas para tratamento do canal radicular. Nestas aplicações utiliza-se a propriedade superelástica da liga, que é a recuperação da forma sem necessidade de aquecimento.( ResumoEste trabalho apresenta o desenvolvimento de um dispositivo que torne possível a realização de ensaios de fadiga em flexão rotativa em fios de liga NiTi com diâmetro mínimo de até 0,50 mm, capazes de formar um arco de 180º com um raio de curvatura de 50 mm a 100 mm. O sistema é automático, controlado por microcomputador em linguagem C ++ . O microcomputador acoplado a um dispositivo de rotação poderá controlar a velocidade, temperatura ambiente e número de voltas durante o ensaio. Palavras-chave: Fadiga; Fios de NiTi; Flexão rotativa. DEVICE TO ROTARY BENDING OF NiTi WIRES IN FATIGUE TESTS AbstractThis work presents the development of a device that makes possible to undertake rotary bending fatigue tests in NiTi alloy wires with diameters down to 0.50 mm, capable to form an arc of 180º with a bend radius from 50 to 100 mm. The system is automatically controlled by a microcomputer with C ++ language. The microcomputer coupled to a rotary device controls the rotational speed, ambient temperature and number of turns during the test.

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Torsional properties of twisted and machined endodontic files

Cited by 40 publications

References 9 publications

Torsional Resistance of Retreatment Instruments

Torsional Resistance of Retreatment Instruments

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

DISPOSITIVO PARA FLEXÃO ROTATIVA DE FIOS NiTi EM ENSAIO DE FADIGA

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