Torsional and stiffness properties of nickel–titanium K files

Camps, Jean; Pertot, Wilhelm-Joseph

doi:10.1111/j.1365-2591.1995.tb00307.x

Cited by 47 publications

(24 citation statements)

References 15 publications

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“…5 These new instruments exhibit more elastic flexibility in bending and torsion, 5 and are also markedly superior to stainless steel instruments in terms of angular deflection and maximum torque to failure. 6 These instruments have been found to be better than stainless steel instruments in maintaining the original anatomy and the shape and position of the apical foramen. [7][8][9] However, despite the evident advantages of the new technique, Ni-Ti rotary instruments have several unexpected disadvantages.…”

Section: Introductionmentioning

confidence: 99%

Influence of taper on the screw-in effect of nickel-titanium rotary files in simulated resin root canal

Sung

Kim

2010

J Korean Acad Conserv Dent

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Objectives:The introduction of nickel-titanium alloy endodontic instruments has greatly simplified shaping the root canal systems. However, these new instruments have several unexpected disadvantages. One of these is tendency to screw into the canal. In this study, the influence of taper on the screw-in effect of the Ni-Ti rotary instrument were evaluated. Materials and Methods: A total of 20 simulated root canals with an S-shaped curvature in clear resin blocks were divided into two groups. ProFile .02, .04, .06 (Dentsply-Maillefer) and GT rotary files .08, .10, .12 (Dentsply) were used in Profile group, and K3 .04, .06, .08, .10, and .12 (SybronEndo, Glendora) were used in K3 group. Files were used with a single pecking motion at a constant speed of 300 rpm. A special device was made to measure the force of screw-in effect. A dynamometer of the device recorded the screwin force during simulated canal preparation and the recorded data was stored in computer with designed software. The data were subjected to one-way ANOVA and Tukey's multiple range test for post-hoc test. p value of less than 0.05 was regarded significant. Results: The more tapered instruments generated more screw-in forces in Profile group (p < 0.05). In K3 group, 0.08, 0.10. and 0.12 tapered instruments showed more screw-in force than 0.04 tapered one, and 0.08 and 0.12 tapered instruments showed more screw-in force than 0.06 tapered one (p < 0.05). Conclusions: The more tapered instruments seems to produce more screw-in force. To avoid this screw-in force during instrumentation, more attention may be needed when using more tapered instruments. [J Kor Acad Cons Dent 2010;35(5):380-386.]

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Section: Introductionmentioning

confidence: 99%

Influence of taper on the screw-in effect of nickel-titanium rotary files in simulated resin root canal

Sung

Kim

2010

J Korean Acad Conserv Dent

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“…현재 시판되고 있는 대부분의 니켈-티타늄 파 일들은 non-cutting tip을 가지고 있으며 각 제조사들은 주 로 rake angle을 달리하여 삭제능의 우수함을 내세우거나, radial land의 유무나 폭을 제시하며 근관의 변위 정도 및 파일의 파절 정도를 줄일 수 있다고 말하고 있다. 제조사들 이 주장하는 내용은, rake angle이 양의 값을 가진 경우 음 의 값을 가진 경우처럼 planing action이 아니라 cutting action을 가져서 삭제능이 높아진다는 것과 radial land를 가진 경우 그것이 없을 때보다 근관 성형 후에 근관의 변위 정도가 작다는 것이다 [16][17][18][19][20] . [23][24][25] .…”

Section: 점이다unclassified

Shaping ability of nickel-titaniumrotary files

Park

Lee

Hur

2004

J Korean Acad Conserv Dent

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This study compared the shaping ability of nickel-titanium rotary files with different rake angle and radial land.The nickel-titanium files used in this study were Profile(Dentsply, Maillefer, Ballaigues, Switzerland), Hero 642(Micromega, Besancon, France), and K3(SybronEndo, Glendora, Ca, USA) file. Resin blocks substituted for root canals. 36 resin blocks were divided into 3 groups with 12 canals each. The time for canal preparation was recorded. The images of pre-and postoperative resin canal were scanned and those were superimposed. Amounts of canal deviation, total canal widths, inner canal widths, and outer canal widths were measured at apical 1, 2, 3, 4, 5, 6, and 7mm levels.The amount of canal deviation was the smallest in Profile group, and the time for canal preparation was the shortest in Hero 642 group. K3 group resulted in competent characteristics in both measurements. Positive rake angle seemed to result in fast shaping of root canal and radial land guide the instrument in center of the canals and around curvatures. Radial land also tended to reduce the sense of screwing into the root canal.The proper selection of the nickel-titanium file based on the knowledge about file design is needed for the safer, simpler and faster root canal therapy. [J Kor Acad Cons Dent 29(1):44-50, 2004]

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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 and stiffness properties of nickel–titanium K files

Cited by 47 publications

References 15 publications

Influence of taper on the screw-in effect of nickel-titanium rotary files in simulated resin root canal

Influence of taper on the screw-in effect of nickel-titanium rotary files in simulated resin root canal

Shaping ability of nickel-titaniumrotary files

DISPOSITIVO PARA FLEXÃO ROTATIVA DE FIOS NiTi EM ENSAIO DE FADIGA

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