Objective       To construct the three-dimensional (3-D) finite element model of maxillary anterior teeth in lingual differential retraction force system and to determine the biomechanical effect of the maxillary anterior teeth.       Methods       The geometrical information of the maxillary bone and teeth were obtained from a dry skull

and the lingual appliance were from Solidworks CAD software. The MIMICS software was used to construct the three-dimensional finite element model of maxillary bone. ANSYS were used to mesh the model and construct the 3-D finite element model.       Results       Our 3-D finite element model of maxillary anterior teeth in lingual differential retraction force system was constructed successfully with details and verisimilitude. Under the 0.015 N·m moment by tip back bend and 56.6 g class Ⅱ elastics force

the stress and strain distribution were demonstrated within physical remodeling range.       Conclusion       The 3-D finite element model of maxillary teeth lingual retraction differential force system is proved with high similarity in geometry

and able to be used to investigate the biomechanical effect of such complex force system.