Orthodontic treatment requires optimum force to bring about maximum tooth movement with minimal damage to the root, periodontal ligament (PDL), and alveolar bone. Hence, the quantification and direction of force is very important during orthodontic treatment. This force brings about changes in the PDL which in turn initiates orthodontic tooth movement.Therefore, the stressed state of the PDL needs to be studied in order to understand the effect of different forces. [1][2][3][4][5][6][7][8][9][10] Finite element method (FEM) is a mathematical method in which the shape of complex geometric objects and their physical properties are computer-constructed. Physical interactions of the various components of the model can then be calculated in terms of stress and strain, a detailed information which is difficult to obtain by any other experimental or analytical means due to the interaction of anatomical structures with the surrounding tissue.Labial Orthodontics (LaO) and lingual Orthodontics (LiO) are used for similar tooth movements, but they differ considerably in their biomechanics. [11][12][13][14][15][16][17] Several methods can be used to evaluate the differences and the most suited method is the FEM or finite element analysis (FEA). This study evaluated the differences in the biomechanics of tipping movement in labial and LiO using FEM/FEA.

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