An initial investigation of the bending and torsional properties of nitinol root canal files

Walia, Harmeet; Brantley, William A.; Gerstein, Harold

doi:10.1016/s0099-2399(88)80196-1

Cited by 963 publications

(707 citation statements)

References 13 publications

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“…However, nickel-titanium endodontic instruments were just introduced in 1988 by Walia, Brantley and Gerstein 14 . The instruments fabricated with this alloy present two remarkable properties, elasticity and the shape memory effect.…”

Section: Discussionmentioning

confidence: 99%

In vitro evaluation of the presence of apical deviation with employment of automated handpieces with continuous and alternate motion for root canal preparation

Limongi

Klymus²,

Baratto‐Filho

et al. 2004

J. Appl. Oral Sci.

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he present study conducted an in vitro evaluation of the presence of apical deviation on the root canal preparation of the mesiobuccal roots of human maxillary molars employing automated handpieces with continuous motion, the Pow R system (Moyco Union Broach), and alternate motion, the M4 system (Kerr). Analysis of the presence of apical deviation was carried out by means of radiographs obtained on a radiographic desk fabricated for the study. The results demonstrated the lack of statistically significant differences between the two systems as to the evaluation of the presence of apical deviation. There was no correlation between the degree of curvature of the roots and the degree of apical deviation for the continuous motion system. However, there was a statistic difference for the alternate motion system, with a direct correlation of moderate degree. Uniterms: Root canal preparation; Apical deviation; Rotary instruments. presente trabalho avaliou, in vitro, a presença de desvio apical no preparo de canais radiculares em raízes mésio-vestibulares de molares superiores humanos utilizando-se de peças automatizadas de giro contínuo, sistema Pow R (Moyco Union Broach) e giro alternado, sistema M4 (Kerr -USA). A análise da presença de desvios apicais foi realizada por meio de radiografias obtidas na plataforma radiográfica confeccionada para o experimento. Os resultados mostraram não haver diferença estatisticamente significante quanto à avaliação da presença de desvio entre os dois sistemas. Não houve correlação entre o grau de curvatura das raízes e o grau de desvio apical, no sistema de giro contínuo. No entanto, o sistema de giro alternado apresentou diferença estatística de correlação direta e grau médio.

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Section: Discussionmentioning

confidence: 99%

In vitro evaluation of the presence of apical deviation with employment of automated handpieces with continuous and alternate motion for root canal preparation

Limongi

Klymus²,

Baratto‐Filho

et al. 2004

J. Appl. Oral Sci.

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“…Ni-Ti instruments were introduced to facilitate instrumentation of curved canals. These instruments are superelastic and will flex far more (10-20 times more) than stainless-steel instruments before exceeding their elastic limit (1,2). Despite this increased flexibility, many authors have reported unexpected fractures (3).…”

Section: Introductionmentioning

confidence: 99%

Microstructural effects on Ni-Ti endodontic instruments failure

Kuhn

Jordan

2001

J. Phys. IV France

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Abstract. Endodontic treatments consist to eliminate the vascular nervous system of the tooth. The objectives of this treatment are adequate cleaning and shaping the root canals of the tooth. The endodontic treatment is essential to the success of prosthetics therapy and the lifetime of the tooth. The difficulties of endodontic treatments lie in the abruptness of canal curvature. Ni-Ti endodontic instruments were introduced to facilitate instrumentation of curved canals. They are superelastic and flex far more than stainless-steel instruments. Despite the increased flexibility we can observe unexpected fractures of these Ni-Ti files. The purpose of this work is to understand the process history on fracture life. Our results are based on microstructural and mechanical investigations of Ni-Ti engine-driven rotary files: X-ray diffraction, SEM, DSC, microhardness and bending tests. Thus, and as we expected, endodontic files are very work-hardened: there is a high density of defects in the alloy, which will impede the phase transformation. DSC : the phase transformation A/R-Phase is predominant, the martensitic transformation is difficult to observe. The microvickers hardness confirms these observations (dislocations and precipitates). The X-rays show that the experimental peaks are broad, which is typical of a distorted lattice. Morover, machining resulted in the work hardening of files. Some thermal treatments are involved in promoting some changes in the mechanical properties and transformation characteristics. Annealing around 400°C shows good results : the recovery allows a compromise between an adequate density of defects to see the R-Phase germination and a low density to limit the brittleness of these instruments. The surface state of the endodontic files is an important factor for failures and fractures initiation. In these applications, it is very critical to predict the service life based on the theoretical modeling.

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“…Ni-Ti; files have 2-3 times the elastic flexibility of SS files because of the very low values of modulus of elasticity in tension and shear modulus of (10) , while flexibility of K-flex files is between them and the decrease of flexibility is more uniform with an increase in file size (11) .…”

Section: Discussionmentioning

confidence: 99%

A Comparison of Time Needed for Instrumentation of Simulated Curved Canals by Using Different Files

Al-Ani¹

2016

Iraqi dent. j.

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An initial investigation of the bending and torsional properties of nitinol root canal files

Cited by 963 publications

References 13 publications

In vitro evaluation of the presence of apical deviation with employment of automated handpieces with continuous and alternate motion for root canal preparation

In vitro evaluation of the presence of apical deviation with employment of automated handpieces with continuous and alternate motion for root canal preparation

Microstructural effects on Ni-Ti endodontic instruments failure

A Comparison of Time Needed for Instrumentation of Simulated Curved Canals by Using Different Files

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