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Quintessence Publishing: Journals: ORTHODONTICS
The Art and Practice of Dentofacial Enhancement

Formerly World Journal of Orthodontics

Edited by
Rafi Romano, DMD, MSc (Editor-in-Chief)

ISSN 2160-2999 (print) / ISSN 2160-3006 (online)

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Spring 2009
Volume 10 , Issue 1

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Force-deflection properties of initial orthodontic archwires

Cátia Cardoso Abdo Quintão, DDS, MSc, PhD, Julio Pedra e Cal-Neto, DDS, MS, Luciane M. Menezes, DDS, MSc, PhD, Carlos Nelson Elias, DDS, MSc, PhD

Pages: 29–32
PMID: 19388430

Aim: This in vitro study measured the force-deflection behavior of selected initial alignment archwires by conducting three-point bending tests under controlled conditions. The study tested four wire designs: multistranded stainless steel, conventional stainless steel, superelastic nickel-titanium, and thermoactivated nickel-titanium archwires. Method: The wires (n = 15) were ligated into stainless steel brackets with steel ligatures. A testing machine recorded deactivations at 2.0 mm of deflection at 37°C. Force-deflection measurements were recorded from only deactivation. Forces on deactivation were compared by one-way analysis of variance (ANOVA) and Tukey post-hoc tests. Results: Significant differences (P < .05) in deactivation forces were observed among the tested wires. The multistranded stainless steel wire had the lowest mean deactivation force (1.94 N), while the conventional stainless steel group had the highest value (4.70 N). The superelastic and thermoactivated Ni-Ti groups were similar to the multistranded wire (P > .05). Conclusion: Both nickel-titanium and multistranded steel archwires tested are potentially adequate for use during the leveling and aligning phase of orthodontics. World J Orthod 2009;10:29–32.

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