Interlot variations of transition temperature range and force delivery in copper-nickel-titanium orthodontic wires

Pompei-Reynolds, Renée C. and Kanavakis, Georgios. (2014) Interlot variations of transition temperature range and force delivery in copper-nickel-titanium orthodontic wires. American Journal of Orthodontics and Dentofacial Orthopedics, 146 (2). pp. 215-226.

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Official URL: https://edoc.unibas.ch/80668/

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The manufacturing process for copper-nickel-titanium archwires is technique sensitive. The primary aim of this investigation was to examine the interlot consistency of the mechanical properties of copper-nickel-titanium wires from 2 manufacturers.; Wires of 2 sizes (0.016 and 0.016 × 0.022 in) and 3 advertised austenite finish temperatures (27°C, 35°C, and 40°C) from 2 manufacturers were tested for transition temperature ranges and force delivery using differential scanning calorimetry and the 3-point bend test, respectively. Variations of these properties were analyzed for statistical significance by calculating the F statistic for equality of variances for transition temperature and force delivery in each group of wires. All statistical analyses were performed at the 0.05 level of significance.; Statistically significant interlot variations in austenite finish were found for the 0.016 in/27°C (P = 0.041) and 0.016 × 0.022 in/35°C (P = 0.048) wire categories, and in austenite start for the 0.016 × 0.022 in/35°C wire category (P = 0.01). In addition, significant variations in force delivery were found between the 2 manufacturers for the 0.016 in/27°C (P = 0.002), 0.016 in/35.0°C (P = 0.049), and 0.016 × 0.022 in/35°C (P = 0.031) wires.; Orthodontic wires of the same material, dimension, and manufacturer but from different production lots do not always have similar mechanical properties. Clinicians should be aware that copper-nickel-titanium wires might not always deliver the expected force, even when they come from the same manufacturer, because of interlot variations in the performance of the material.
Faculties and Departments:03 Faculty of Medicine > Departement Zahnmedizin > Klinik Kieferorthopädie Kinderzahnmedizin
UniBasel Contributors:Kanavakis, Georgios M.
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:American Association of Orthodontists
Note:Publication type according to Uni Basel Research Database: Journal article
Identification Number:
Last Modified:20 Apr 2021 15:56
Deposited On:20 Apr 2021 15:56

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