Objective Three-dimensional element method was used to reconstrust the high accuracy of self-ligating brackets system on periodontal tissue of maxillary dentition. To investigate the upper lateral incisor on stress and strain distributions of periodontal ligament of maxillary canine and displacement under the orthodontics force. Methods Scanning images of maxilla and dentitions were made through multi-slice CT scanner. Mimics software was used to reconstruct a three-dimensional element model of maxilla, dentitions, periodontal membrane, self-ligating and edgewise appliance. Simulation the engagement of archiwire into brackets. Regarding the prestress of edgewise to proposed method could get the real-time lateral incisor orthodontic force and movement. Results In the early orthodontic treatment, root stress was mainly root central 1/3 and at the junction of root tip, periodontal membrane stress was mainly for tooth neck, the stress of the alveolar bone is relatively complex, tooth movement for the tilt movement. Conclusion The model has high biological similarity and reasonable mesh with finite element software. In the process of clinical treatment, the main stress of periodontal tissue clusters is the weak area stress, prone to disease, in the course of treatment should avoid these areas. According to the displacement of the tooth root, the teeth is tilt movement. The dentist should rationally take all these parameters into account in the clinical treatment.
