Estimation of mechanical parameters for orthodontic retraction loops using finite element analysis

Forces and moments are the main parameters deciding the safety of many of the engineering as well as biomaterials. Since every material has certain yield or ultimate strength, it is always desirable to work in the safe limits to maintain the integrity of the systems. In the present analysis, five standard loops used in the orthodontic applications (T-Loop, Vertical Loop, Opus70, Mushroom and Helix) were analysed using finite element analysis for a fixed horizontal length of 14 mm and a vertical height of 10 mm. Analysis is carried out using 3D beam elements with an element size of 0.25 mm as the accuracy of finite elements are mainly based on element size. For all the analysis, the load deflection rate, vertical force generation and moment values are recorded with carried out in the nonlinear domain to capture the results better. The results shows that minimum force and moment development when the loop is positioned at centre. It is positioned near any bracket, maximum forces and moments are create near the activation bracket. Higher the elastic modulus, the wire is inducing higher moments and forces which are key to the stability of the orthodontic structure. Finite element analysis is effectively used to estimate the load deflection rate, force and moment generation based on different types of loops, positions and materials. (C) 2020 Elsevier Ltd. All rights reserved.