Pseudoelasticity and thermoelasticity of nickel-titanium alloys: A clinically oriented review. Part I: Temperature transitional ranges

Santoro, Margherita; Nicolay, Olivier; Cangialosi, Thomas J.

doi:10.1067/mod.2001.112446

Cited by 69 publications

(61 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…These data support the belief that the more martensitic an NiTi alloy is the more flexible and hence the more fatigue resistant an instrument becomes (22). In fact, instruments with M-Wire (Sportswire LLC, Langley, OK) may prove more flexible and fatigue resistant than instruments manufactured with conventional NiTi wire (15), likely because of thermal processing in the creation of the alloy that produces a better arrangement of the crystal structure and changes in the relative percentage of phases present in the alloy (23).…”

Section: Coolingsupporting

confidence: 75%

Evidence for Reduced Fatigue Resistance of Contemporary Rotary Instruments Exposed to Body Temperature

Vasconcelos

Murphy

Carvalho³

et al. 2016

Journal of Endodontics

177

149

View full text Add to dashboard Cite

show abstract

Section: Coolingsupporting

confidence: 75%

Evidence for Reduced Fatigue Resistance of Contemporary Rotary Instruments Exposed to Body Temperature

Vasconcelos

Murphy

Carvalho³

et al. 2016

Journal of Endodontics

177

149

View full text Add to dashboard Cite

show abstract

“…These phase transitions can occur through changes in temperature, known as thermoelasticity. 7,8 More typically, these phase transitions can be stress induced by engaging an archwire in a deflected tooth, or stretching a spring over a hook. Shape memory is evident when a deflected nickel titanium archwire that is engaging significantly rotated teeth attempts to return to its original arch form (martensitic phase).…”

Section: Introductionmentioning

confidence: 99%

“…These properties of nickel titanium have made a significant impact in terms of orthodontic treatment mechanics. [7][8][9] Superelasticity refers to the ability of an alloy to exhibit fairly constant stress values over a large range. In orthodontics, this property would allow a nickel titanium spring to exhibit approximately the same amount of force whether it was stretched a small or a large distance.…”

Section: Introductionmentioning

confidence: 99%

Forces of Various Nickel Titanium Closed Coil Springs

Maganzini

Wong

Ahmed

2010

The Angle Orthodontist

View full text Add to dashboard Cite

Objective: To compare the forces generated by 14 different 9 mm springs supplied by five different companies. Materials and Methods: Five replicates of 14 different 9 mm springs were evaluated, resulting in 70 total specimens. Each was extended once from its resting length to 12 mm and then was deactivated. All tests were performed in a 37ЊC water bath. Forces were recorded at the 12 mm extension and deactivation distances of 9 mm, 6 mm, 3 mm, and 1 mm using an MTS force gauge. Data were collected with Testworks software, version 4.0, and were analyzed by analysis of variance (ANOVA) with one factor alternated. Results: Mean peak load forces at 12 mm were significantly different between springs, and these forces varied from 147 to 474 grams. Mean unload forces measured at 9 mm, 6 mm, and 3 mm of deactivation values were highly variable, and only 6 of the 14 springs exhibited a ''physiologic'' mean unload force of 50 grams or less over the total deactivation range. Conclusions: Few springs tested exhibited physiologic peak load forces and constant deactivation forces. This study suggests that labeling of nickel titanium closed coil springs is confusing and misleading. (Angle Orthod. 2010;80:182-187.)

show abstract

“…1 At lower temperatures, the alloy is completely present in the martensitic phase until the increase in temperature causes the progressive transformation into austenite. 2 Each NiTi alloy has a specific temperature range in which this phase transition takes place, called the ''TTR.'' Shape memory property is the capability of NiTi wires to be plastically deformed in their martensite phase.…”

Section: Introductionmentioning

confidence: 99%

The effect of temperature on the mechanical behavior of nickel-titanium orthodontic initial archwires

Lombardo

Toni

Stefanoni

et al. 2012

The Angle Orthodontist

View full text Add to dashboard Cite

Objectives: To investigate and compare the characteristics of commonly used types of traditional and heat-activated initial archwires at different temperatures by plotting their load/deflection graphs and quantifying three parameters describing the discharge plateau phase. Materials and Methods: Forty-eight archwires of cross-sectional diameters ranging from 0.010 inches to 0.016 inches were obtained from seven different manufacturers. A modified three-point wire-bending test was performed on three analogous samples of each type of archwire at 55uC and 5uC, simulating an inserted archwire that is subjected to cold or hot drinks during a meal. For each resulting load/deflection curve the plateau section was isolated and the mean value of each parameter for each type of wire was obtained. Results: Permanent strain was exhibited by all wires tested at 55uC. Statistically significant differences were found between almost all wires for the three considered parameters when tested at 55uC and 5uC. Loads were greater at 55uC than at 5uC. Differences were also found between traditional and heat-activated archwires, the latter of which generated longer plateaus at 55uC, shorter plateaus at 5uC, and lighter mean forces at both temperatures. The increase in average force seen with increasing diameter tended to be rather stable at both temperatures. Conclusions: All nickel-titanium wires tested showed a significant change related to temperature in terms of behavior and force for both traditional and heat-activated wires. Stress under high temperatures can induce permanent strain, whereas the residual strain detected at low temperatures can be recovered from as temperature increases. (Angle Orthod. 2013;83:298-305.)

show abstract

Pseudoelasticity and thermoelasticity of nickel-titanium alloys: A clinically oriented review. Part I: Temperature transitional ranges

Cited by 69 publications

References 27 publications

Evidence for Reduced Fatigue Resistance of Contemporary Rotary Instruments Exposed to Body Temperature

Evidence for Reduced Fatigue Resistance of Contemporary Rotary Instruments Exposed to Body Temperature

Forces of Various Nickel Titanium Closed Coil Springs

The effect of temperature on the mechanical behavior of nickel-titanium orthodontic initial archwires

Contact Info

Product

Resources

About