influence of inter-bracket distance on load deflection characteristics of nickel-titanium wires

Abstract

Aim: Aim of this study was to compare and evaluate load deflection characteristic of NiTi wires of different cross-section between labial and lingual straight wire system in aligned and crowded condition. Materials & Methods:  The study was divided into two parts one with the aligned teeth and in other part typodont set was manipulated to simulate the crowded arch. Crowding was created in the anterior region by displacing one central incisor and one lateral incisor 2 mm palataly and canine were rotated in mesio-buccal direction. Typodont was sent to laboratory for lingual setup and CAD-CAM based Avant grade laser sintered 3D lingual brackets were and bonded using Cyanoacrylate by the laboratory. A modified three point bending test simulating the clinical conditions was carried out to investigate load deflection characteristics of Cu-NiTi arch-wires using Instron Universal Testing Machine. Results: Shapiro-wilk test and Kolmogorov-Smirnov test were used to check the normality of the sample and values. Intergroup comparison of LDR of wires between labial and lingual group in aligned and crowded condition showed that LDR of wires in the lingual bracket system was significantly higher as compared to labial bracket system.