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Journal of Orofacial Orthopedics / Fortschritte der Kieferorthopädie

01-11-2023 | Original Article

Evaluation of torsional strength and torque presentation of coated rectangular stainless steel archwires, an in vitro study

Authors: Professor Parisa Salehi, Associate Professor Shabnam Ajami, Nazanin Berahman, Assistant Professor Niloofar Azadeh

Published in: Journal of Orofacial Orthopedics / Fortschritte der Kieferorthopädie

Abstract

Objectives

An in vitro experimental study was performed to evaluate the torsional strength and torque released by esthetic coated archwires.

Materials and methods

A total of 52 coated (study group) and 52 stainless steel (control group) rectangular archwires from two manufacturers (brand I: Gestenco International AB, Gothenburg, Sweden and brand II: Ortho Technology, Lutz, FL, USA) in two sizes (0.019 × 0.025 and 0.017 × 0.0250-inch) were evaluated. The straight parts on both ends of each preformed archwire were cut in 30 mm segments. A specially designed experimental device was attached to the universal testing machine (Model Z020, Zwick Roell, Ulm, Germany) to measure torsional strength and to calculate the clinically significant torque interval. The groups were compared based on their brand, presence of coating and size using three-way analysis of variance (ANOVA) test at a significance level of 5%.

Results

The results revealed that coating of the wires of brand 1 resulted in a significant reduction of torsional strength in both wire sizes (P-value = 0.0001). For the wires of brand 2, coating of the 0.017 × 0.025-in wire resulted in a significant reduction in torsional strength. However, for the 0.019 × 0.025 in wire size, the presence of coating significantly increased the torsional strength (P-value = 0.0001). Coating did not affect the measured clinical torque interval of the analyzed wires when a torque between 5 and 20 Nmm was applied (P-value = 0.062).

Conclusions

Mechanical behavior of coated archwires depends mainly on the thickness of their inner core alloy. Reduction in the diameter of the inner alloy resulted in reduced torsional strength. Despite lower mean torsional strength, in the settings of this study, coated and conventional wires demonstrated comparable torque angles if loaded in the typical range of activation.

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Title: Evaluation of torsional strength and torque presentation of coated rectangular stainless steel archwires, an in vitro study
Authors: Professor Parisa Salehi
Associate Professor Shabnam Ajami
Nazanin Berahman
Assistant Professor Niloofar Azadeh
Publication date: 01-11-2023
Publisher: Springer Medizin
Published in: Journal of Orofacial Orthopedics / Fortschritte der Kieferorthopädie
Print ISSN: 1434-5293
Electronic ISSN: 1615-6714
DOI: https://doi.org/10.1007/s00056-023-00503-0

At a glance: The STEP trials

Springer Medicine

Evaluation of torsional strength and torque presentation of coated rectangular stainless steel archwires, an in vitro study

Abstract

Objectives

Materials and methods

Results

Conclusions

At a glance: The STEP trials

Springer Medicine

Abstract

Objectives

Materials and methods

Results

Conclusions

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