Abstract
Background: The objective of this study was to compare the mechanical properties of three orthodontic wires between levelled and unlevelled bracket using a three-point bending test. Methods: Three groups of ten Nickel titanium, Betatitanium and CuNiTi wire segments (0.017 × 0.025-in. diameter) were used. Two brackets were bonded to an acrylic jig with a 10-mm interbracket distance. Deflection test was done in two scenarios, one with aligned brackets and other with 2-mm horizontal displacement of the brackets to simulate malaligned teeth. Forces of loading and unloading of the wires during both tests were compared by an analysis of variance (ANOVA) tests. Results: The difference of LDR between levelled and unlevelled brackets during loading in NiTi wire was 0.1 N, Beta-titanium wire 0.2 N and CuNiTi wire was 1.5 N. The difference of LDR between levelled and unlevelled brackets during unloading in NiTi wire was 0.2 N, Betatitanium wire was 0.3 N and CuNiTi wire is 0.5 N. Conclusions: The study showed some significant differences in forces generated during loading and unloading among the three different types of wires tested. During both the scenarios only CuNiTi wire showed significant difference. Betatitanium wire exhibited highest force followed by NiTi and CuNiTi. Keywords: NiTi, Beta-titanium, CuNiTi wires, Three-point bending test, Load deflection rate (LDR), Newtons (N)
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