关键词: 上颌第一前磨牙, 受力分析, 三维有限元, maxillary first premolar, stress analysis, three-dimensional finite element

Abstract: Objective To study the variation law of the stress and displacement of teeth while exerting correctional forces of different magnitudes and directions, to provide relevant theoretical basis for the clinical treatment of the rotated teeth. Methods To establish a three-dimensional finite element model of the maxillary first premolar as well as its surrounding tissues, and to study the stress distribution in the clinical crown centers of the buccal and lingual face exerting a pair of equal size but opposite direction forces. Results Under different loading conditions, the stress concentrations were observed at the neck of the rotated maxillary first premolar tooth .With the increase of the force, the tooth displacement and the maximum stress value increased. Tooth displacement was larger when the Angle between the force and the X axis was smaller. Conclusion The force should be lighter, and the force direction and the X axis should be in parallel to prevent tooth from absorbing.