Tensile properties of orthodontic wire

Twelftree, C.C.; Cocks, Graeme; Sims, M.R.

doi:10.1016/0002-9416(77)90335-9

Cited by 14 publications

(6 citation statements)

References 2 publications

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“…diScuSSion Several types of laboratorial tests were suggested on the attempt to obtain the mechanical properties of orthodontic archwires, from the test of resistance to traction 27,28,29 to the flexion and bending tests. 3,28 In 1977, the American Dental Association (ADA) released a specification 18 to standardize the laboratorial tests for classification of orthodontic archwires, being chosen the flexion and bending tests.…”

Section: Resultsmentioning

confidence: 99%

Mechanical properties of NiTi and CuNiTi shape-memory wires used in orthodontic treatment. Part 1: stress-strain tests

Gravina

Brunharo²,

Canavarro

et al. 2013

Dental Press J. Orthod.

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OBJECTIVE: This research aimed to compare, through traction tests, eight types of superelastic and heat-activated NiTi archwires, by six trade companies (GAC, TP, Ormco, Masel, Morelli and Unitek) to those with addition of copper (CuNiTi 27ºC and 35ºC, Ormco). METHODS: The tests were performed in an EMIC mechanical testing machine, model DL10000, capacity of 10 tons, at the Military Institute of Engineering (IME). RESULTS: The results showed that, generally, heat-activated NiTi archwires presented slighter deactivation loadings in relation to superelastic. Among the archwires that presented deactivation loadings biologically more adequate are the heat-activated by GAC and by Unitek. Among the superelastic NiTi, the CuNiTi 27ºC by Ormco were the ones that presented slighter deactivation loadings, being statistically (ANOVA) similar, to the ones presented by the heat-activated NiTi archwires by Unitek. When compared the CuNiTi 27ºC and 35ºC archwires, it was observed that the 27ºC presented deactivation forces of, nearly, ⅓ of the presented by the 35ºC. CONCLUSION: It was concluded that the CuNiTi 35ºC archwires presented deactivation loadings biologically less favorable in relation to the other heat-activated NiTi archwires, associated to lower percentage of deformation, on the constant baselines of deactivation, showing less adequate mechanical behavior, under traction, in relation to the other archwires.

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Section: Resultsmentioning

confidence: 99%

Mechanical properties of NiTi and CuNiTi shape-memory wires used in orthodontic treatment. Part 1: stress-strain tests

Gravina

Brunharo²,

Canavarro

et al. 2013

Dental Press J. Orthod.

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“…4 Such an effect had already been demonstrated in stainless steel, [6][7][8][9] Elgiloy, 9,10 nickeltitanium, 5,[7][8][9]12 and beta-titanium wires, 8,11 in clips of selfligating brackets, 13 and more recently in beta-titanium springs. 3,11 As is characteristic of this phenomenon, 9,10,12 the effect of stress relaxation was gradual, occurring majorly during the first 24 hours and gradually increasing during the 12 remaining weeks. The literature suggests that a 24-hour period would be enough to access stress relaxation in orthodontic wires, 5 but it has been shown that significant changes can occur after the first 24 hours.…”

Section: Discussionmentioning

confidence: 98%

Effects of stress relaxation in beta-titanium orthodontic loops: Part II

Júnior

Caldas

Martins

2015

The Angle Orthodontist

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Objective: To determine which regions of beta-titanium T-loop springs (TLSs) are more affected by the stress relaxation over a 12-week period. Materials and Methods: Fifty TLS were previously activated by concentrated bends and divided into five groups of 10 each according to their evaluation periods: immediate assessment (G0), 24 hours (G1), 48 hours (G2), 1 week (G3), and 12 weeks (G4). Groups 1 to 4 were mounted into a structure simulating a clinical situation. After the experimental periods, the springs were scanned for measurement of their angles and numbered from 1 to 9. A two-way analysis of variance was used to detect differences among the angles measured and differences caused by time and also to detect interactions between those two factors. Tukey's test was used to find differences among the groups. Results: Time influenced the angulations of the TLSs (P , .001). Tukey post hoc test showed that G0 (84.1u) presented a different profile, whereas G1 (90.2u), G2 (90.7u), and G3 (91.1u) had similar profiles among each other, with G4 (92.6u) showing a mean value different from all other groups. A significant interaction was detected between activation time and angular deformation in the TLSs (P , .01). Conclusion: Stress relaxation was observed in the TLSs. It was greatest within 24 hours and gradually increased up to 12 weeks. Two regions were identified as responsible for the relaxation of the TLSs: one at the bend between the vertical extensions of the springs and the base arch and the other at the preactivation bends made in the base arch. (Angle Orthod. 2016;86:386-390.)

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“…A tensile test is normally used to determine mechanical properties of orthodontic wire and is considered more representative of clinical use than conventional tensile test. 33, 34 Hence, we studied the activation behavior of the wire at 0.5 mm and 1 mm (loading); and deactivation behavior at 0.5 mm (unloading).…”

Section: Discussionmentioning

confidence: 99%

Comparative Evaluation of Dimensional Accuracy, Surface Characteristics, and Load Deflection Attributes of 0.019" × 0.025" Stainless Steel Wires Sourced from Six Different Commercial Houses: An In Vitro Study

Kolge

Patni

Karandikar

et al. 2020

J Indian Orthod Soc

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Aims & Objectives: The aim of the study was to evaluate and compare dimensional accuracy, surface characteristics and load deflection attributes of SS wires sourced from six different commercial houses. Materials & Methods: 0.019” x 0.025” SS wire samples were divided into 6 groups and evaluated and compared for the aforementioned properties. Dimensional accuracy, surface roughness, frictional resistance, load deflection rate and ultimate tensile strength were evaluated and compared. Results: Dimensional accuracy did not vary significantly. Surface Profilometry proved 3M Unitek (Group 1) to be the wire with least irregularities. According to SEM, Modern Orthodontics (Group 6) and 3M Unitek (Group 1) in terms of ‘Sa’ and ‘Sq’ respectively had the smoothest surface finish. SS wires sourced from G&H Orthodontics (Group 2) exhibited least frictional resistance. Load deflection rates varied for all the groups for all three parameters under the study. UTS was best for SS wires sourced from Rabbit Force Orthodontics (Group 5). Conclusion: No wire from a single commercial house excels in all the parameters that were evaluated, each one having its aces and minuses.

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Tensile properties of orthodontic wire

Cited by 14 publications

References 2 publications

Mechanical properties of NiTi and CuNiTi shape-memory wires used in orthodontic treatment. Part 1: stress-strain tests

Mechanical properties of NiTi and CuNiTi shape-memory wires used in orthodontic treatment. Part 1: stress-strain tests

Effects of stress relaxation in beta-titanium orthodontic loops: Part II

Comparative Evaluation of Dimensional Accuracy, Surface Characteristics, and Load Deflection Attributes of 0.019" × 0.025" Stainless Steel Wires Sourced from Six Different Commercial Houses: An In Vitro Study

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