Aligning Archwires, the Shape of Things to Come?—A Fourth and Fifth Phase of Force Delivery

Evans, Tom; Durning, Peter

doi:10.1179/bjo.23.3.269

Cited by 39 publications

(34 citation statements)

References 19 publications

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“…Brauchli, et al 8 (2011) found Af of 29.2°C for archwire NeoSentalloy size 0.016"x0.022". Conversely, Evans and Durning 10 (1996) observed Af of 68°C and Mf of 24°C for archwire Heat Activated NiTi size 0.016"x0.022", which disagrees with this study. The present results suggest that these two archwires present the best clinical performance considering the shape memory effect and pseudoelasticity property, since the Af of these archwires is closer to the oral temperature.…”

Section: Discussioncontrasting

confidence: 95%

“…Conversely, Figueiredo, et al 11 (2012) compared the mechanical behavior of the same archwires, except for the Heat Activated NiTi, and revealed that these archwires present pseudoelasticity. Evans and Durning 10 (1996) found Af of 24°C for the archwire Thermomemoria (Leone, Oxnard, CA, USA), suggesting similar clinical performance as the aforementioned archwires.…”

Section: Discussionmentioning

confidence: 97%

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Transition temperature range of thermally activated nickel-titanium archwires

Spini¹,

Valarelli²,

Cançado³

et al. 2014

J. Appl. Oral Sci.

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Objectives The shape memory resulting from the superelasticity and thermoelastic effect is the main characteristic of thermally activated NiTi archwires and is closely related to the transition temperature range (TTR). The aim of this study was to evaluate the TTR of thermally activated NiTi archwires commercially available. Material and Methods Seven different brands of 0.019"x0.025" thermally activated nickel-titanium archwires were tested as received by differential scanning calorimetry (DSC) over the temperature range from -100°C to 150°C at 10°C/min. Results All thermally activated NiTi archwires analyzed presented stage transformation during thermal scanning with final austenitic temperature (Af) ranging from 20.39°C to 45.42°C. Three brands of NiTi archwires presented Af close to the room temperature and, this way, do not present properties of shape memory and pseudoelasticity that are desirable in clinical applications. Conclusions The thermally activated NiTi archwires present great variability in the TTR and the elastic parameters of each NiTi archwire should be provided by the manufacturers, to allow achievement of the best clinical performance possible.

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Section: Discussioncontrasting

confidence: 95%

Section: Discussionmentioning

confidence: 97%

Transition temperature range of thermally activated nickel-titanium archwires

Spini¹,

Valarelli²,

Cançado³

et al. 2014

J. Appl. Oral Sci.

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“…(1992) in order that the desired clinical characteristics could be obtained. Evans & Durning (1996) reported the differences in formulations of nickel-titanium alloy and their applications in archwire technology. A review article published by Kusy (1997) described the properties and characteristics of contemporary archwires from initial development to their current use in variable modulus orthodontics as advocated by Burstone (1981).…”

Section: Orthodonticsmentioning

confidence: 99%

An overview of nickel–titanium alloys used in dentistry

2000

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The nickel-titanium alloy Nitinol has been used in the manufacture of endodontic instruments in recent years. Nitinol alloys have greater strength and a lower modulus of elasticity compared with stainless steel alloys. The super-elastic behaviour of Nitinol wires means that on unloading they return to their original shape following deformation. These properties are of interest in endodontology as they allow construction of root canal instruments that utilize these favourable characteristics to provide an advantage when preparing curved canals. This review aims to provide an overview of Nitinol alloys used in dentistry in order for its unique characteristics to be appreciated.

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“…7 Multistranded stainless steel and nickel titanium alloys seem to be the closest archwire materials fulfilling these requirements. [8][9][10][11] Though nickel titanium (NiTi) alloy-based wires are most commonly used during the leveling and aligning phase of treatment, 12 multistranded wires are proposed as an alternative to these wires based on classic mechanics theory (Strength 5 Stiffness 3 Range), 13 and over the decades, it has proved to be equally efficient as NiTi alloy-based wires. [14][15][16] Though NiTi archwires have wide acceptance in orthodontics because of their low load-deflection ratio and better control of force magnitude, many authors 17,18 have expressed the need for clinical performance evaluation of these wires because their properties have not been assessed in clinical studies to the same extent as have their mechanical properties in the laboratory setup.…”

Section: Introductionmentioning

confidence: 99%